CN112958150B - Preparation of ethylenediamine-coated cadmium telluride nano-belt photocatalyst and separation method of uranium in radioactive wastewater - Google Patents
Preparation of ethylenediamine-coated cadmium telluride nano-belt photocatalyst and separation method of uranium in radioactive wastewater Download PDFInfo
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- 239000011941 photocatalyst Substances 0.000 title claims abstract description 116
- 239000002127 nanobelt Substances 0.000 title claims abstract description 64
- 229910052770 Uranium Inorganic materials 0.000 title claims abstract description 60
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 title claims abstract description 58
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 title claims abstract description 44
- MARUHZGHZWCEQU-UHFFFAOYSA-N 5-phenyl-2h-tetrazole Chemical compound C1=CC=CC=C1C1=NNN=N1 MARUHZGHZWCEQU-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 239000002354 radioactive wastewater Substances 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title claims description 12
- 238000000926 separation method Methods 0.000 title description 2
- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 238000003756 stirring Methods 0.000 claims abstract description 37
- YKYOUMDCQGMQQO-UHFFFAOYSA-L cadmium dichloride Chemical compound Cl[Cd]Cl YKYOUMDCQGMQQO-UHFFFAOYSA-L 0.000 claims abstract description 32
- 239000011259 mixed solution Substances 0.000 claims abstract description 26
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 claims abstract description 24
- 230000001699 photocatalysis Effects 0.000 claims abstract description 23
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 22
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 230000009467 reduction Effects 0.000 claims abstract description 20
- 239000000047 product Substances 0.000 claims abstract description 19
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 claims abstract description 14
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims abstract description 12
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 claims abstract description 12
- 239000010935 stainless steel Substances 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002244 precipitate Substances 0.000 claims abstract description 10
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000001035 drying Methods 0.000 claims abstract description 9
- 239000002074 nanoribbon Substances 0.000 claims description 22
- CJOBVZJTOIVNNF-UHFFFAOYSA-N cadmium sulfide Chemical compound [Cd]=S CJOBVZJTOIVNNF-UHFFFAOYSA-N 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 8
- 238000009832 plasma treatment Methods 0.000 claims description 8
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 4
- 238000013032 photocatalytic reaction Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052724 xenon Inorganic materials 0.000 claims description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 2
- 229910052980 cadmium sulfide Inorganic materials 0.000 abstract description 18
- WUPHOULIZUERAE-UHFFFAOYSA-N 3-(oxolan-2-yl)propanoic acid Chemical compound OC(=O)CCC1CCCO1 WUPHOULIZUERAE-UHFFFAOYSA-N 0.000 abstract description 15
- 238000001179 sorption measurement Methods 0.000 abstract description 15
- 239000003054 catalyst Substances 0.000 abstract description 8
- 125000003277 amino group Chemical group 0.000 abstract description 7
- 239000000463 material Substances 0.000 abstract description 4
- 238000012986 modification Methods 0.000 abstract description 4
- 230000004048 modification Effects 0.000 abstract description 4
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 abstract description 4
- 229910052714 tellurium Inorganic materials 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 44
- 230000000052 comparative effect Effects 0.000 description 23
- 238000002474 experimental method Methods 0.000 description 18
- 238000006722 reduction reaction Methods 0.000 description 18
- 238000002835 absorbance Methods 0.000 description 13
- 230000035484 reaction time Effects 0.000 description 12
- 238000000026 X-ray photoelectron spectrum Methods 0.000 description 11
- 238000005286 illumination Methods 0.000 description 11
- 239000000203 mixture Substances 0.000 description 8
- 238000003917 TEM image Methods 0.000 description 7
- 238000004847 absorption spectroscopy Methods 0.000 description 7
- 238000010531 catalytic reduction reaction Methods 0.000 description 7
- 238000002336 sorption--desorption measurement Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 5
- -1 uranium ions Chemical class 0.000 description 4
- 238000001237 Raman spectrum Methods 0.000 description 3
- 238000002329 infrared spectrum Methods 0.000 description 3
- 230000031700 light absorption Effects 0.000 description 3
- 238000002441 X-ray diffraction Methods 0.000 description 2
- 238000000862 absorption spectrum Methods 0.000 description 2
- RBFQJDQYXXHULB-UHFFFAOYSA-N arsane Chemical compound [AsH3] RBFQJDQYXXHULB-UHFFFAOYSA-N 0.000 description 2
- 239000007853 buffer solution Substances 0.000 description 2
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 2
- 238000001027 hydrothermal synthesis Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000007146 photocatalysis Methods 0.000 description 2
- 239000011736 potassium bicarbonate Substances 0.000 description 2
- 229910000028 potassium bicarbonate Inorganic materials 0.000 description 2
- 230000002285 radioactive effect Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000002371 ultraviolet--visible spectrum Methods 0.000 description 2
- 229910052984 zinc sulfide Inorganic materials 0.000 description 2
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000007810 chemical reaction solvent Substances 0.000 description 1
- FOCAUTSVDIKZOP-UHFFFAOYSA-N chloroacetic acid Chemical compound OC(=O)CCl FOCAUTSVDIKZOP-UHFFFAOYSA-N 0.000 description 1
- 229940106681 chloroacetic acid Drugs 0.000 description 1
- 230000000536 complexating effect Effects 0.000 description 1
- 238000010668 complexation reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 125000003916 ethylene diamine group Chemical group 0.000 description 1
- 238000000024 high-resolution transmission electron micrograph Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011946 reduction process Methods 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- XSOKHXFFCGXDJZ-UHFFFAOYSA-N telluride(2-) Chemical compound [Te-2] XSOKHXFFCGXDJZ-UHFFFAOYSA-N 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
- B01J31/0235—Nitrogen containing compounds
- B01J31/0237—Amines
- B01J31/0238—Amines with a primary amino group
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
- B01J31/02—Catalysts comprising hydrides, coordination complexes or organic compounds containing organic compounds or metal hydrides
- B01J31/0234—Nitrogen-, phosphorus-, arsenic- or antimony-containing compounds
- B01J31/0235—Nitrogen containing compounds
- B01J31/0254—Nitrogen containing compounds on mineral substrates
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/04—Treating liquids
- G21F9/06—Processing
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Abstract
The invention discloses a method for preparing an ethylenediamine-coated cadmium telluride nanobelt photocatalyst and separating uranium from radioactive wastewater, which comprises the following steps of: preparing a cadmium telluride sulfide nano belt: adding cadmium chloride into ethylenediamine, uniformly stirring, adding sulfur powder and tellurium powder, continuously uniformly stirring, adding hydrazine hydrate, and stirring for 25-35 min to obtain a mixed solution; transferring the mixed solution into a stainless steel reaction kettle, reacting for 6-10 hours at 115-125 ℃, centrifuging and collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 55-65 ℃ to obtain the cadmium telluride nano-belt photocatalyst. The invention prepares the ethylenediamine-coated cadmium telluride nano-belt photocatalyst material, which provides amino as an adsorption site, improves the band gap structure of the cadmium sulfide nano-belt by introducing tellurium, and obtains the high-efficiency catalyst for photocatalytic reduction of hexavalent uranium by balancing the modification of the amino group and the band gap structure to the cadmium telluride nano-belt.
Description
Technical Field
The invention belongs to the technical field of organic and inorganic nano materials and preparation thereof, and particularly relates to a method for preparing an ethylenediamine-coated cadmium telluride nano-belt photocatalyst and separating uranium from radioactive wastewater.
Background
Hexavalent uranium is a typical toxic and radioactive ion in radioactive effluents, which has been extensively studied from the standpoint of resource recovery and environmental protection. The photocatalytic reduction process can convert soluble hexavalent uranium ions to insoluble tetravalent uranium ions, which provides high selectivity for the non-reducing ions. However, the photocatalyst for hexavalent uranium reduction has a lower uranium adsorption capacity and a weaker light absorption capacity. At present, a plurality of different methods are known to optimize the hexavalent uranium reduction photocatalyst, and for the photocatalyst with lower uranium adsorption capacity, the high-efficiency hexavalent uranium adsorption capacity can be realized through a ligand complexing mechanism on the photocatalyst, namely the introduction of adsorption sites; for the photocatalyst with weaker light absorption capacity, the improvement of the light absorption capacity can be realized by optimizing a band gap structure through element doping.
The invention synthesizes the ethylenediamine-coated cadmium telluride nano-belt photocatalyst material, provides amino as an adsorption site, improves the band gap structure of the cadmium sulfide nano-belt by introducing tellurium, and obtains the high-efficiency catalyst for photocatalytic reduction of hexavalent uranium by balancing the modification of the amino group and the band gap structure to the cadmium telluride nano-belt.
Disclosure of Invention
According to the invention, through a hydrothermal reaction, ethylenediamine is used as a reaction solvent, and sulfur powder and tellurium powder are added to prepare the cadmium sulfide telluride nanobelt with amino groups. The invention aims to realize the regulation and control of the surface amino groups of the cadmium telluride sulfide nanobelt by adding the sulfur powder and the tellurium powder, simultaneously optimize the band gap width of the cadmium telluride sulfide, realize good photoresponse efficiency and solve the problems of lack of active adsorption sites and matching of photoresponse band gaps in the reaction of photocatalytic reduction of uranium.
An object of the present invention is to solve at least the above problems and/or disadvantages and to provide at least the advantages described hereinafter.
To achieve these objects and other advantages in accordance with the present invention, there is provided a method for preparing an ethylenediamine-coated cadmium telluride nanoribbon photocatalyst, comprising the steps of:
step one, preparing a cadmium telluride sulfide nanobelt: adding cadmium chloride into ethylenediamine, uniformly stirring, adding sulfur powder and tellurium powder, continuously uniformly stirring, adding hydrazine hydrate, and stirring for 25-35 min to obtain a mixed solution;
and step two, transferring the mixed solution into a stainless steel reaction kettle, reacting for 6-10 hours at 115-125 ℃, centrifugally collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 55-65 ℃ to obtain the cadmium telluride nano-belt photocatalyst.
Preferably, in the first step, the molar volume ratio of the cadmium chloride to the ethylenediamine is 1mmol: 25-35 mL.
Preferably, the molar ratio of the total amount of the sulfur powder and the tellurium powder to the cadmium chloride is 1: 1; the molar ratio of the sulfur powder to the tellurium powder is 0.95-0.8: 0.05-0.2.
Preferably, the molar volume ratio of the cadmium chloride to the hydrazine hydrate is 1mmol: 2.5-3.5 mL.
Preferably, in the second step, before the mixed solution is transferred to the stainless steel reaction kettle, an Nd: YAG pulse laser is used for carrying out ultraviolet pulse laser irradiation on the mixed solution for 5-10 min.
Preferably, the wavelength of the ultraviolet pulse laser irradiation is 355nm, the pulse width is 10-20 ns, and the pulse frequency is 10-30 Hz; the single pulse energy is 20-100 mJ.
Preferably, in the second step, the cadmium telluride nanobelt photocatalyst is treated for 60 to 90 seconds by using a low-temperature plasma treatment instrument.
Preferably, the atmosphere of the low-temperature plasma processor is nitrogen and/or ammonia; the frequency of the low-temperature plasma treatment instrument is 45-65 KHz, the power is 60-100W, and the pressure of the atmosphere is 40-60 Pa.
Preferably, the sulfur cadmium telluride nanobelt photocatalyst is added into the uranium-containing radioactive wastewater, nitrogen is introduced into the uranium-containing radioactive wastewater for 120min to exhaust oxygen in the uranium-containing radioactive wastewater, and then photocatalytic reaction is carried out under the condition that a xenon lamp simulates sunlight, so that the photocatalytic reduction of hexavalent uranium in the uranium-containing radioactive wastewater is realized.
The invention at least comprises the following beneficial effects: the invention prepares the ethylenediamine-coated cadmium telluride nano-belt photocatalyst material, which provides amino as an adsorption site, improves the band gap structure of the cadmium sulfide nano-belt by introducing tellurium, and obtains the high-efficiency catalyst for photocatalytic reduction of hexavalent uranium by balancing the modification of the amino group and the band gap structure to the cadmium telluride nano-belt.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Description of the drawings:
FIG. 1 is a TEM image of a cadmium telluride chalcogenide nanoribbon photocatalyst prepared in example 1 of the present invention;
FIG. 2 is a HRTEM of a cadmium telluride sulfide nanoribbon photocatalyst prepared in example 1 of the present invention;
FIG. 3 is a TEM image of a cadmium sulfide nanobelt photocatalyst prepared in comparative example 1 of the present invention;
FIG. 4 is a TEM image of a cadmium telluride nanoribbon photocatalyst prepared in example 3 of the present invention;
FIG. 5 is an XRD pattern of photocatalysts prepared in examples 1 to 3 of the present invention and comparative example 1;
FIG. 6 is a Raman spectrum of the photocatalysts prepared in examples 1 to 3 of the present invention and comparative example 1;
FIG. 7 is an infrared spectrum of the photocatalysts prepared in examples 1 to 3 of the present invention and comparative example 1;
FIG. 8 is a Cd 3d XPS spectrum of photocatalysts prepared in examples 1-3 of the present invention and comparative example 1;
FIG. 9 is a Te 3d XPS spectrum of photocatalysts prepared in examples 1-3 of the present invention and comparative example 1;
FIG. 10 is S2 p XPS spectra of photocatalysts prepared in examples 1-3 of the present invention and comparative example 1;
FIG. 11 is an XPS spectrum of photocatalysts prepared in examples 1 to 3 of the present invention and comparative example 1;
FIG. 12 is a graph of N1s XPS spectra of photocatalysts prepared in examples 1-3 of the present invention and comparative example 1;
FIG. 13 shows the U (VI) removal rate of photocatalysts prepared in examples 1-3 and comparative example 1 of the present invention under dark conditions at different times;
FIG. 14 shows the U (VI) removal rate of the photocatalysts prepared in examples 1-3 and comparative example 1 under the illumination condition for different time periods;
FIG. 15 shows the U (VI) removal rate of the photocatalyst prepared in example 1 of the present invention under different solid-to-liquid ratio conditions;
FIG. 16 shows the U (VI) removal rate of the photocatalyst prepared in example 1 of the present invention under different initial concentration conditions;
FIG. 17 shows the U (VI) removal rate of the photocatalyst prepared in example 1 of the present invention under different pH conditions;
FIG. 18 shows the U (VI) removal rate of the photocatalyst prepared in example 1 of the present invention under multiple cycle conditions.
FIG. 19 shows the U (VI) removal rate of photocatalysts prepared in examples 2 and 4 of the present invention under different illumination conditions for different time periods;
FIG. 20 shows the U (VI) removal rate of photocatalysts prepared in examples 2 and 5 of the present invention under illumination conditions for different periods of time;
FIG. 21 shows the U (VI) removal rate of photocatalysts prepared in examples 2 and 6 of the present invention under illumination conditions for different periods of time;
FIG. 22 shows the U (VI) removal rate of the photocatalysts prepared in the embodiments 2 and 4 to 6 of the present invention under the condition of multiple cycles.
The specific implementation mode is as follows:
the present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It will be understood that terms such as "having," "including," and "comprising," as used herein, do not preclude the presence or addition of one or more other elements or groups thereof.
Example 1:
a preparation method of an ethylenediamine-coated sulfur cadmium telluride nanobelt photocatalyst comprises the following steps:
step one, preparing cadmium sulfide nanobelts: adding 1mmol of cadmium chloride into 30mL of ethylenediamine, stirring uniformly, adding a mixture of 1mmol of sulfur powder and tellurium powder, continuing stirring uniformly, adding 3mL of hydrazine hydrate, and stirring for 30min to obtain a mixed solution; the molar ratio of the sulfur powder to the tellurium powder is 0.95: 0.05;
step two, transferring the mixed solution into a 45mL stainless steel reaction kettle, reacting for 8h at 120 ℃, after the reaction is finished,centrifuging to collect the product, washing with pure water and ethanol for three times, and vacuum drying the final precipitate at 60 deg.C to obtain cadmium telluride sulfide nanobelt photocatalyst, i.e. CdS0.95Te0.05-EDA; wherein EDA represents ethylenediamine;
example 2:
a preparation method of an ethylenediamine-coated sulfur cadmium telluride nanobelt photocatalyst comprises the following steps:
step one, preparing cadmium sulfide nanobelts: adding 1mmol of cadmium chloride into 30mL of ethylenediamine, stirring uniformly, adding a mixture of 1mmol of sulfur powder and tellurium powder, continuing stirring uniformly, adding 3mL of hydrazine hydrate, and stirring for 30min to obtain a mixed solution; the molar ratio of the sulfur powder to the tellurium powder is 0.9: 0.1;
step two, transferring the mixed solution into a 45mL stainless steel reaction kettle, reacting for 8 hours at 120 ℃, centrifugally collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 60 ℃ to obtain the cadmium telluride sulfide nanobelt photocatalyst; i.e. CdS0.90Te0.1-EDA。
Example 3:
a preparation method of an ethylenediamine-coated sulfur cadmium telluride nanobelt photocatalyst comprises the following steps:
step one, preparing cadmium sulfide nanobelts: adding 1mmol of cadmium chloride into 30mL of ethylenediamine, stirring uniformly, adding a mixture of 1mmol of sulfur powder and tellurium powder, continuing stirring uniformly, adding 3mL of hydrazine hydrate, and stirring for 30min to obtain a mixed solution; the molar ratio of the sulfur powder to the tellurium powder is 0.8: 0.2;
step two, transferring the mixed solution into a 45mL stainless steel reaction kettle, reacting for 8h at 120 ℃, centrifugally collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 60 ℃ to obtain the cadmium telluride sulfide nanobelt photocatalyst, namely CdS0.80Te0.2-EDA。
Example 4:
a preparation method of an ethylenediamine-coated sulfur cadmium telluride nanobelt photocatalyst comprises the following steps:
step one, preparing cadmium sulfide nanobelts: adding 1mmol of cadmium chloride into 30mL of ethylenediamine, stirring uniformly, adding a mixture of 1mmol of sulfur powder and tellurium powder, continuing stirring uniformly, adding 3mL of hydrazine hydrate, and stirring for 30min to obtain a mixed solution; the molar ratio of the sulfur powder to the tellurium powder is 0.9: 0.1; irradiating the mixed solution with Nd-YAG pulsed laser for 10 min; the wavelength of the ultraviolet pulse laser irradiation is 355nm, the pulse width is 20ns, and the pulse frequency is 30 Hz; the single pulse energy is 80 mJ;
step two, transferring the mixed solution into a 45mL stainless steel reaction kettle, reacting for 8 hours at 120 ℃, centrifugally collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 60 ℃ to obtain the cadmium telluride sulfide nanobelt photocatalyst; i.e. CdS0.90Te0.1-EDA-1。
Example 5:
a preparation method of an ethylenediamine-coated sulfur cadmium telluride nanobelt photocatalyst comprises the following steps:
step one, preparing cadmium sulfide nanobelts: adding 1mmol of cadmium chloride into 30mL of ethylenediamine, stirring uniformly, adding a mixture of 1mmol of sulfur powder and tellurium powder, continuing stirring uniformly, adding 3mL of hydrazine hydrate, and stirring for 30min to obtain a mixed solution; the molar ratio of the sulfur powder to the tellurium powder is 0.9: 0.1;
step two, transferring the mixed solution into a 45mL stainless steel reaction kettle, reacting for 8 hours at 120 ℃, centrifugally collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 60 ℃ to obtain the cadmium telluride sulfide nanobelt photocatalyst; processing the sulfur cadmium telluride nano-belt photocatalyst for 90s by using a low-temperature plasma processor to obtain the sulfur cadmium telluride nano-belt photocatalyst, namely CdS0.90Te0.1-EDA-2; the atmosphere of the low-temperature plasma treatment instrument is nitrogen and/or ammonia; the frequency of the low-temperature plasma treatment instrument is 65KHz, the power is 100W, and the pressure of the atmosphere is 60 Pa.
Example 6:
a preparation method of an ethylenediamine-coated sulfur cadmium telluride nanobelt photocatalyst comprises the following steps:
step one, preparing cadmium sulfide nanobelts: adding 1mmol of cadmium chloride into 30mL of ethylenediamine, stirring uniformly, adding a mixture of 1mmol of sulfur powder and tellurium powder, continuing stirring uniformly, adding 3mL of hydrazine hydrate, and stirring for 30min to obtain a mixed solution; the molar ratio of the sulfur powder to the tellurium powder is 0.9: 0.1; irradiating the mixed solution with Nd-YAG pulsed laser for 10 min; the wavelength of the ultraviolet pulse laser irradiation is 355nm, the pulse width is 20ns, and the pulse frequency is 30 Hz; the single pulse energy is 80 mJ;
step two, transferring the mixed solution into a 45mL stainless steel reaction kettle, reacting for 8 hours at 120 ℃, centrifugally collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 60 ℃ to obtain the cadmium telluride sulfide nanobelt photocatalyst; processing the sulfur cadmium telluride nano-belt photocatalyst for 90s by using a low-temperature plasma processor to obtain the sulfur cadmium telluride nano-belt photocatalyst, namely CdS0.90Te0.1-EDA-3; the atmosphere of the low-temperature plasma treatment instrument is nitrogen and/or ammonia; the frequency of the low-temperature plasma treatment instrument is 65KHz, the power is 100W, and the pressure of the atmosphere is 60 Pa.
Comparative example 1:
a preparation method of an ethylenediamine-coated cadmium sulfide nanobelt photocatalyst comprises the following steps:
step one, preparing cadmium sulfide nanobelts: adding 1mmol of cadmium chloride into 30mL of ethylenediamine, uniformly stirring, adding 1mmol of sulfur powder, continuously uniformly stirring, adding 3mL of hydrazine hydrate, and stirring for 30min to obtain a mixed solution;
and step two, transferring the mixed solution into a 45mL stainless steel reaction kettle, reacting for 8 hours at 120 ℃, centrifugally collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 60 ℃ to obtain the cadmium sulfide nanobelt photocatalyst, namely CdS-EDA.
FIG. 1 is a TEM image of a cadmium telluride chalcogenide nanoribbon photocatalyst prepared in example 1 of the present invention; FIG. 2 is a HRTEM of a cadmium telluride sulfide nanoribbon photocatalyst prepared in example 1 of the present invention; FIG. 3 is a TEM image of a cadmium sulfide nanobelt photocatalyst prepared in comparative example 1 of the present invention; FIG. 4 is a TEM image of a cadmium telluride nanoribbon photocatalyst prepared in example 3 of the present invention; from the TEM images, it can be seen that the prepared cadmium telluride nanoribbon photocatalyst has similar nanoribbon morphology. From the HRTEM images, it can be seen that the (002) and (101) planes of the wurtzite structure have two different lattice fringes with a plane spacing of 0.34 and 0.32nm, respectively.
FIG. 5 is an XRD pattern of photocatalysts prepared in examples 1 to 3 of the present invention and comparative example 1; FIG. 6 is a Raman spectrum of the photocatalysts prepared in examples 1 to 3 of the present invention and comparative example 1; FIG. 7 is an infrared spectrum of the photocatalysts prepared in examples 1 to 3 of the present invention and comparative example 1. As shown by XRD, the characteristic peaks of all the nanobelt photocatalysts are similar to the original CdS-EDA peak in the original wurtzite phase. As shown by Raman spectrum, the nanobelt photocatalyst is at 301cm-1And 605cm-1Vibration bands are shown, which are divided into scatter and double scatter in the longitudinal optical system. Phonons of CdS-EDA (LO and 2 LO). When the x of the nanoribbon photocatalyst is 0.20, an additional vibration band (about 410 cm) appears-1) Corresponding to the 2LO mode of CdTe-EDA nanoribbons. As can be seen from the infrared spectrum, CN stretching vibration, CH stretching vibration and CH stretching vibration were 1043cm, respectively-1(region A), 1388cm-1(region B) and 2928cm-1Peak value of (D region). The NH bending vibration and the stretching vibration are respectively positioned at 1633cm-1(region C) and 3440cm-1(region E), indicating that Ethylenediamine (EDA) has grafted onto the nanobelt photocatalyst.
FIG. 8 is a Cd 3d XPS spectrum of photocatalysts prepared in examples 1-3 of the present invention and comparative example 1; FIG. 9 is a Te 3d XPS spectrum of photocatalysts prepared in examples 1-3 of the present invention and comparative example 1; FIG. 10 is S2 p XPS spectra of photocatalysts prepared in examples 1-3 of the present invention and comparative example 1; FIG. 11 is an XPS spectrum of photocatalysts prepared in examples 1 to 3 of the present invention and comparative example 1; FIG. 12 is a graph of N1s XPS spectra of photocatalysts prepared in examples 1-3 of the present invention and comparative example 1; in Cd 3d XPS spectrum of nano-belt photocatalyst, Cd 3d increases with the increase of Te content3/2And 3d5/2The XPS peak of (A) is slightly shifted, thereby reducing the binding energy due to the weak transfer of electrons from Te to Cd. The spectrum of N1s in FIG. 12 was divided into 399.6eV (-NH-) and 397.1eV (-NH-)2) Two peaks indicate that the ethylenediamine can effectively introduce amino on the surface of the nanobelt photocatalyst after the hydrothermal reaction; the presence of amino groups on the nanoribbon catalyst surface provides more active sites for the photocatalysis of u (vi) to adsorb u (vi).
The adsorption-catalytic reduction experiments of u (vi) were performed on the photocatalysts prepared in comparative example 1, example 2 and example 3:
after the photocatalytic reduction of uranium, the concentration of the reaction solution was mainly measured by an ultraviolet spectrophotometer. The specific operation is as follows: preparing buffer solution (1 liter of pure water, 8 grams of chloroacetic acid, 3 grams of sodium acetate), 1 gram of arsine III solution per liter and uranium-containing solution;
preparation of a standard curve: taking a standard curve of a uranium-containing solution of 8 milligrams per liter as an example, respectively adding 0, 0.5, 0.75, 1, 1.25, 1.5, 1.75, 2, 2.25, 2.5 and 3 milliliters of 8 milligrams per liter of the uranium-containing solution into 2.35 milliliters of the solution (containing 2 milliliters of buffer solution and 0.35 milliliters of arsine III solution), adding pure water to fix the volume to 10 milliliters, uniformly mixing, measuring absorbance under the condition that the wavelength is 651.8 nanometers, wherein each absorbance corresponds to one concentration, and drawing the standard curve;
dark conditions: respectively in 20mL UO2 2+Solution (C)0To 200mg/L, 293K, pH 4, 5mg of the sample (photocatalyst prepared in example 1, example 2, comparative example 1) was added, stirred at 600r/min in the dark for 80min, and the absorbance of the reacted solution was measured by uv spectrophotometer (uv-vis absorption spectrum monitoring UO for various reaction times at 651.8nm wavelength)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken; wherein the removal rate is (C)0-Ct)/C0×100％，C0As initial concentration, CtIs the post-adsorption concentration;
the illumination condition is as follows: respectively in 20mL UO2 2+Solution (C)0200mg/L, T293K, pH 4) to 5 mg/LSamples (photocatalysts prepared in examples 1, 2 and 1) were treated with N in the dark2Bubbling the aqueous system for 120 minutes to remove dissolved O2To ensure anaerobic conditions and adsorption-desorption equilibrium; then, simulated sunlight irradiation (300-W Xe lamp BL-GHX-V equipped with AM 1.5G filter) was applied, stirring was carried out at a speed of 600r/min for 140min, and the absorbance of the reacted solution was measured by an ultraviolet spectrophotometer (UO at different reaction times was monitored by ultraviolet visible absorption spectroscopy at a wavelength of 651.8 nm)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken; wherein the removal rate is (C)0-Ct)/C0×100％，C0As initial concentration, CtIs the post-adsorption concentration;
fig. 13 and 14 show u (vi) removal on the nanobelt photocatalyst versus reaction time in the dark or light, respectively. In the dark, the u (vi) removal was less than 2% for all the nanoribbon photocatalysts. Under dark conditions, the amino groups on the nanobelt photocatalyst cause limitations in the complexation of u (vi) to the adsorption sites, resulting in a weaker u (vi) removal rate. For comparison, CdS when simulated in sunlight0.95Te0.05The U (VI) removal rate of the EDA nanobelt reaches 97.4 percent. Fig. 15 shows the relationship between solid-to-liquid ratio and u (vi) removal rate on the nanobelt photocatalyst. When the solid-liquid ratio exceeds 0.15, the removal rate of U (VI) can reach 96 percent.
FIG. 16 shows CdS at different initial U (VI) concentrations0.95Te0.05U (VI) removal rate of EDA nanoribbons. CdS under the photocatalysis conditions of 10, 50, 100, 200 and 300mg/L0.95Te0.05The removal rates of EDA nanoribbons for u (vi) were 95.7%, 95.1%, 94.5%, 94.8% and 68.2%, respectively. The pH of the solution greatly affects the surface charge of the material, which directly leads to changes in the binding sites. The results are shown in FIG. 17; further, CdS0.95Te0.05The EDA nanoribbons remained stable after 4 cycles of photocatalytic reaction.
The photocatalyst prepared in example 1 was subjected to adsorption-catalytic reduction experiments of u (vi) (addition of different amounts of photocatalyst):
dark conditions: respectively in 20mL UO2 2+Solution (C)0The photocatalyst prepared in example 1 was added in different amounts (solid-to-liquid ratio m/V: 0.05g/L, 0.15g/L, 0.25g/L, 0.35g/L, 0.45g/L) to 200mg/L, T: 293K, pH: 4), stirred at a speed of 600r/min for 120min under dark conditions, and the absorbance of the solution after the reaction was measured by an ultraviolet spectrophotometer (uv-vis absorption spectrum, UO at wavelength of 651.8nm for different reaction times was monitored)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken;
the illumination condition is as follows: respectively in 20mL UO2 2+Solution (C)0Different masses of the photocatalyst prepared in example 1 were added (solid-to-liquid ratio m/V0.05 g/L, 0.15g/L, 0.25g/L, 0.35g/L, 0.45g/L) in 200mg/L, T293K, pH 4) and with N in the dark2Bubbling the aqueous system for 120 minutes to remove dissolved O2To ensure anaerobic conditions and adsorption-desorption equilibrium; then, simulated sunlight irradiation (300-W Xe lamp BL-GHX-V equipped with AM 1.5G filter) was applied, stirring was carried out at a speed of 600r/min for 120min, and the absorbance of the reacted solution was measured by an ultraviolet spectrophotometer (UO at different reaction times was monitored by ultraviolet visible absorption spectroscopy at a wavelength of 651.8 nm)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken; wherein the removal rate is (C)0-Ct)/C0×100％，C0As initial concentration, CtIs the post-adsorption concentration;
the photocatalyst prepared in example 1 was subjected to adsorption-catalytic reduction experiments (different initial concentrations) of u (vi):
dark conditions: respectively in 20mL UO2 2+Solution (C)010mg/L,50mg/L,100mg/L,200mg/L, and 300mg/L, pH 4) was added 5mg of the photocatalyst prepared in example 1, and 600 r/based on dark conditionsStirring at min speed for 120min, measuring absorbance of the reacted solution by ultraviolet spectrophotometer (ultraviolet visible absorption spectrum monitoring UO of different reaction time at 651.8nm wavelength)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken;
the illumination condition is as follows: respectively in 20mL UO2 2+Solution (C)010mg/L,50mg/L,100mg/L,200mg/L, and 300mg/L, pH 4) to photocatalyst prepared in example 15 mg was added with N in the dark2Bubbling the aqueous system for 120 minutes to remove dissolved O2To ensure anaerobic conditions and adsorption-desorption equilibrium; then, simulated sunlight irradiation (300-W Xe lamp BL-GHX-V equipped with AM 1.5G filter) was applied, stirring was carried out at a speed of 600r/min for 120min, and the absorbance of the reacted solution was measured by an ultraviolet spectrophotometer (UO at different reaction times was monitored by ultraviolet visible absorption spectroscopy at a wavelength of 651.8 nm)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken; wherein the removal rate is (C)0-Ct)/C0×100％，C0As initial concentration, CtIs the post-adsorption concentration;
the photocatalyst prepared in example 1 was subjected to adsorption-catalytic reduction experiments (different pH) of u (vi):
dark conditions: respectively in 20mL UO2 2+Solution (C)0To 200mg/L, pH 3,4,5,6,7,8,9) was added 5mg of the photocatalyst prepared in example 1, the mixture was stirred at a speed of 600r/min in the dark for 120min, and the absorbance of the solution after the reaction was measured by an ultraviolet spectrophotometer (UO for various reaction times was monitored by ultraviolet visible absorption spectrum at a wavelength of 651.8nm2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken;
the illumination condition is as follows: respectively in 20mL UO2 2+Solution (C)0＝200mg/L, pH 3,4,5,6,7,8,9) 5mg of the photocatalyst prepared in example 1 was added and washed with N in the dark2Bubbling the aqueous system for 120 minutes to remove dissolved O2To ensure anaerobic conditions and adsorption-desorption equilibrium; then, simulated sunlight irradiation (300-W Xe lamp BL-GHX-V equipped with AM 1.5G filter) was applied, stirring was carried out at a speed of 600r/min for 120min, and the absorbance of the reacted solution was measured by an ultraviolet spectrophotometer (UO at different reaction times was monitored by ultraviolet visible absorption spectroscopy at a wavelength of 651.8 nm)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken; wherein the removal rate is (C)0-Ct)/C0×100％，C0As initial concentration, CtIs the post-adsorption concentration;
the photocatalyst prepared in example 1 was subjected to adsorption-catalytic reduction experiments (cycle number) of u (vi):
the illumination condition is as follows: at 20mL UO2 2+Solution (C)0pH 4) to 10 mg/L5 mg of the photocatalyst prepared in example 1 was added and washed with N in the dark2Bubbling the aqueous system for 120 minutes to remove dissolved O2To ensure anaerobic conditions and adsorption-desorption equilibrium; then, simulated sunlight irradiation (300-W Xe lamp BL-GHX-V equipped with AM 1.5G filter) was applied, stirring was carried out at a speed of 600r/min for 120min, and the absorbance of the reacted solution was measured by an ultraviolet spectrophotometer (UO at different reaction times was monitored by ultraviolet visible absorption spectroscopy at a wavelength of 651.8 nm)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken; in the recycle test, the catalyst was collected after the reaction, re-oxidized in air for 48 hours, and then dispersed in 0.1mol/L KHCO3Regeneration in solution to remove the deposited UO 2; thereafter, the regenerated catalyst is used in another photocatalytic cycle;
the photocatalysts prepared in example 2 and example 4, example 5 and example 6 were subjected to adsorption-catalytic reduction experiments of u (vi):
the illumination condition is as follows: respectively in 20mL UO2 2+Solution (C)0To 200mg/L, T293K, pH 4, 5mg of sample (photocatalyst prepared according to example 2 and example 4, example 5, example 6) was added and the mixture was washed with N in the dark2Bubbling the aqueous system for 120 minutes to remove dissolved O2To ensure anaerobic conditions and adsorption-desorption equilibrium; then, simulated sunlight irradiation (300-W Xe lamp BL-GHX-V equipped with AM 1.5G filter) was applied, stirring was carried out at a speed of 600r/min for 140min, and the absorbance of the reacted solution was measured by an ultraviolet spectrophotometer (UO at different reaction times was monitored by ultraviolet visible absorption spectroscopy at a wavelength of 651.8 nm)2 2+Concentration), calculating the concentration of hexavalent uranium in the solution after reaction by using a standard curve equation, and calculating the efficiency of photocatalytic reduction of uranium; all experiments were performed in triplicate and the mean values were taken; wherein the removal rate is (C)0-Ct)/C0×100％，C0As initial concentration, CtIs the post-adsorption concentration; as shown in FIGS. 19 to 21, the removal rate of U (VI) by the photocatalyst prepared in example 2 was 85.7%, while the removal rate of U (VI) by the photocatalyst prepared in example 4 was 93.4%; the photocatalyst prepared in example 5 has a U (VI) removal rate of 95.9%; the photocatalyst prepared in example 6 has a U (VI) removal rate of 98.8%;
the photocatalysts prepared in example 2 and example 4, example 5 and example 6 were subjected to adsorption-catalytic reduction experiments (number of cycles) of u (vi):
the illumination condition is as follows: respectively in 20mL UO2 2+Solution (C)0200mg/L, pH 4) to photocatalyst prepared in example 2 and example 4, example 5, example 65, 5mg was added in the dark with N2Bubbling the aqueous system for 120 minutes to remove dissolved O2To ensure anaerobic conditions and adsorption-desorption equilibrium; then, simulated sunlight irradiation (300-W Xe lamp BL-GHX-V equipped with AM 1.5G filter) was applied, stirring was carried out at a speed of 600r/min for 120min, and the absorbance of the reacted solution was measured by an ultraviolet spectrophotometer (UO at different reaction times was monitored by ultraviolet visible absorption spectroscopy at a wavelength of 651.8 nm)2 2+Concentration) of the solution, calculating the hexavalent uranium of the reacted solution by using a standard curve equationConcentration, calculating the efficiency of photocatalytic uranium reduction; all experiments were performed in triplicate and the mean values were taken; in the recycle test, the catalyst was collected after the reaction, re-oxidized in air for 48 hours, and then dispersed in 0.1mol/L KHCO3Regeneration in solution to remove the deposited UO2(ii) a Thereafter, the regenerated catalyst is used in another photocatalytic cycle; as a result, as shown in fig. 22, the photocatalysts prepared in examples 4,5 and 6 were able to maintain a high removal rate after being recycled for 7 times.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (8)
1. A method for separating uranium from radioactive wastewater by using ethylenediamine-coated cadmium telluride nanobelt photocatalyst is characterized by comprising the following steps:
adding a sulfur cadmium telluride nanobelt photocatalyst into the uranium-containing radioactive wastewater, introducing nitrogen for 120min into the uranium-containing radioactive wastewater to exhaust oxygen in the uranium-containing radioactive wastewater, and then carrying out photocatalytic reaction under the condition that a xenon lamp simulates sunlight to realize the photocatalytic reduction of hexavalent uranium in the uranium-containing radioactive wastewater;
wherein, the preparation method of the cadmium telluride sulfide nano-belt photocatalyst comprises the following steps:
step one, preparing a cadmium telluride sulfide nanobelt: adding cadmium chloride into ethylenediamine, uniformly stirring, adding sulfur powder and tellurium powder, continuously uniformly stirring, adding hydrazine hydrate, and stirring for 25-35 min to obtain a mixed solution;
and step two, transferring the mixed solution into a stainless steel reaction kettle, reacting for 6-10 hours at 115-125 ℃, centrifugally collecting products after the reaction is finished, washing the products with pure water and ethanol for three times respectively, and finally drying the precipitate in vacuum at 55-65 ℃ to obtain the cadmium telluride nano-belt photocatalyst.
2. The method for separating uranium from radioactive wastewater by using the ethylenediamine-coated cadmium telluride nanoribbon photocatalyst as claimed in claim 1, wherein in the first step, the molar volume ratio of cadmium chloride to ethylenediamine is 1mmol: 25-35 mL.
3. The method for separating uranium from radioactive wastewater by using the ethylenediamine-coated cadmium telluride nanoribbon photocatalyst as claimed in claim 1, wherein the molar ratio of the total amount of the sulfur powder and the tellurium powder to the cadmium chloride is 1: 1; the molar ratio of the sulfur powder to the tellurium powder is 0.95-0.8: 0.05-0.2.
4. The method for separating uranium from radioactive wastewater by using the ethylenediamine-coated cadmium telluride nanoribbon photocatalyst as claimed in claim 1, wherein the molar volume ratio of cadmium chloride to hydrazine hydrate is 1mmol: 2.5-3.5 mL.
5. The method for separating uranium from radioactive wastewater by using the ethylenediamine-coated cadmium telluride nano-belt photocatalyst as claimed in claim 1, wherein in the second step, before transferring the mixed solution into a stainless steel reaction kettle, an Nd: YAG pulse laser is used for carrying out ultraviolet pulse laser irradiation on the mixed solution for 5-10 min.
6. The method for separating uranium from radioactive wastewater by using the ethylenediamine-coated cadmium telluride nano-belt photocatalyst as claimed in claim 5, wherein the wavelength of the ultraviolet pulse laser irradiation is 355nm, the pulse width is 10-20 ns, and the pulse frequency is 10-30 Hz; the single pulse energy is 20-100 mJ.
7. The method for separating uranium from radioactive wastewater by using the ethylenediamine-coated cadmium telluride nanoribbon photocatalyst as claimed in claim 1, wherein in the second step, the low-temperature plasma processor is used for processing the cadmium telluride nanoribbon photocatalyst for 60-90 s.
8. The method for separating uranium from radioactive wastewater by using the ethylenediamine-coated cadmium telluride nanoribbon photocatalyst as claimed in claim 7, wherein the atmosphere of the low-temperature plasma treatment instrument is nitrogen and/or ammonia; the frequency of the low-temperature plasma treatment instrument is 45-65 KHz, the power is 60-100W, and the pressure of the atmosphere is 40-60 Pa.
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