CN104549395B - Compound photocatalyst for treating wastewater pollution as well as preparation method and application of compound photocatalyst - Google Patents
Compound photocatalyst for treating wastewater pollution as well as preparation method and application of compound photocatalyst Download PDFInfo
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- CN104549395B CN104549395B CN201410577824.5A CN201410577824A CN104549395B CN 104549395 B CN104549395 B CN 104549395B CN 201410577824 A CN201410577824 A CN 201410577824A CN 104549395 B CN104549395 B CN 104549395B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
The invention discloses a compound photocatalyst for treating wastewater pollution as well as a preparation method and application of the compound photocatalyst for treating the wastewater pollution. According to the preparation method, a matrix substance CdLa2S4of the compound photocatalyst is compounded once by virtue of a hydrothermal method and is prepared into the compound photocatalyst with a regular shape by virtue of a calcining method. The compound photocatalyst can be utilized for catalytically degrading organic dyes under ultraviolet irradiation, and particularly the efficiency for catalytically degrading azo organic dyes is high.
Description
Technical field
The invention belongs to photocatalysis field, it is related to a kind of composite photo-catalyst and its preparation and application, particularly to improvement
The composite photo-catalyst sic/cdla of contaminated wastewater2s4And its preparation and application.
Background technology
In recent years, with industrial fast development, problem of environmental pollution is constantly subjected to the common concern of people.With
Administer the continuous improvement of industrial pollution technology, photocatalysis technology, using solar energy, Photocatalyst is carried out to pollutant
Research in terms of environmental improvement is more and more deep.
Another thinking of research photochemical catalyst is to find novel photocatalyst.At present, to can be used for light-catalysed partly leading
The exploitation of body compound is no longer to find semiconducting compound present in nature, but trends towards artificial synthesized semiconductor transformation
Compound, such as cdla2s4Deng, however, not high as the photocatalysis efficiency of photochemical catalyst using this compound merely.
Therefore, need a kind of existing good photocatalysis of exploitation badly and reduce organic photochemical catalyst staining thing effect.
Content of the invention
In order to solve the above problems, present inventor has performed studying with keen determination, it is found that: with cd (no3)2·4h2o、la
(no3)3·6h2O and thiocarbamide, as initial action raw material, prepare cdla by hydro-thermal method single step reaction2s4, to prepared product warp
After simple process, then by carborundum (sic) with process after cdla2s4Powder mixes, and is fully ground, and forges at high temperature
Burn, prepared composite photo-catalyst, the composite photo-catalyst that this is obtained both can be organic in catalytic degradation water under illumination condition
Dyestuff contaminant, particularly azo organic dyestuff.
It is an object of the invention to provide following aspect:
In a first aspect, a kind of composite photo-catalyst sic/cdla2s4It is characterised in that this composite photo-catalyst includes sic
And cdla2s4, wherein, based on cdla2s4Weight meter, the weight fraction of sic is 0.1%～20%；
Its x-ray diffraction spectrum (xrd) the angle of diffraction 2 θ be about 18.03 °, 20.74 °, 24.72 °, 26.50 °, 27.97 °,
Be respectively present at 30.29 °, 43.91 °, 52.05 °, 53.95 °, 35.65 °, 41.46 °, 59.98 ° and 75.26 ° (111),
(200), (120), (121), (220), (300), (303), (422), (501), (111), (200), (220), (203) crystal face spread out
Penetrate peak.
Second aspect, the present invention provides a kind of method preparing above-mentioned composite photo-catalyst, and the method comprises the following steps:
(1)cdla2s4Preparation, including following sub-step:
(1-1) by cd (no3)2·4h2o、la(no3)3·6h2O and thiocarbamide are placed in water, at high temperature isothermal reaction, system
Obtain sediment；
(1-2) sediment being obtained in step (1-1) is separated from reaction system, wash, be dried, obtain cdla2s4
Sample；
(2) composite photo-catalyst sic/cdla2s4Preparation, including following sub-step:
(2-1) weigh the cdla of preparation in step (1) respectively2s4Carry out mixed grinding with sic, by the mixed powder after grinding
End is placed in the container filling solvent；
(2-2) remove solvent, drying, then calcine at high temperature, cool down after calcining, obtain composite photo-catalyst.
The third aspect, the present invention also provides above-mentioned composite photo-catalyst administering sewage, particularly dye wastewater aspect
Application, wherein, described dyestuff is preferably azo dyes.
Brief description
Fig. 1 illustrates xrd spectrogram in experimental example 1, wherein
A represents that comparative example 1 is obtained the xrd spectrogram of sample；
B represents that embodiment 1 is obtained the xrd spectrogram of sample；
C represents that embodiment 2 is obtained the xrd spectrogram of sample；
D represents that embodiment 3 is obtained the xrd spectrogram of sample；
E represents that embodiment 4 is obtained the xrd spectrogram of sample；
F represents that comparative example 2 is obtained the xrd spectrogram of sample；
Fig. 2 a illustrates that comparative example 1 is obtained the scanning electron microscope (SEM) photograph of sample；
Fig. 2 b illustrates that comparative example 2 is obtained the scanning electron microscope (SEM) photograph of sample；
Fig. 2 c illustrates that embodiment 2 is obtained the scanning electron microscope (SEM) photograph of sample；
Fig. 3 illustrates that comparative example 1 and embodiment 2 are obtained sample photoluminescence spectra, wherein,
A represents that comparative example 1 is obtained the photoluminescence spectra figure of sample；
B represents that embodiment 2 is obtained the photoluminescence spectra figure of sample；
Fig. 4 illustrates that comparative example 1, comparative example 2 and embodiment 2 are obtained the impedance spectrum of sample, wherein,
A represents that comparative example 2 is obtained the impedance spectrum of sample；
B represents that comparative example 1 is obtained the impedance spectrum of sample；
C represents that embodiment 2 is obtained the impedance spectrum of sample；
Fig. 5 illustrates that embodiment 1～4, comparative example 1 and comparative example 2 are obtained the ultraviolet catalytic activity of sample, wherein,
A represents that comparative example 1 is obtained the ultraviolet catalytic activity of sample；
B represents that embodiment 1 is obtained the ultraviolet catalytic activity of sample；
C represents that embodiment 2 is obtained the ultraviolet catalytic activity of sample；
D represents that embodiment 3 is obtained the ultraviolet catalytic activity of sample；
E represents that embodiment 4 is obtained the ultraviolet catalytic activity of sample；
F represents that comparative example 2 is obtained the ultraviolet catalytic activity of sample；
Fig. 6 illustrates that scavenger is obtained the ultraviolet light activity influence of the degraded methyl orange solution of sample to embodiment 2, wherein,
No scavenget represents and is added without scavenger；
Ipa represents addition isopropanol；
Ao represents addition ammonium oxalate；
Bq represents addition 1,4-benzoquinone；
Cat represents addition catalase；
no3 -Represent and add nano3.
Specific embodiment
Below by the present invention is described in detail, the features and advantages of the invention will become more with these explanations
For clear, clear and definite.
The present inventor finds through research, by with cd (no3)2·4h2o、la(no3)3·6h2O and thiocarbamide are as initial
Reaction raw materials, prepare cdla by hydro-thermal method single step reaction2s4, after prepared product is processed, then by pretreated carborundum
(sic) with above-mentioned cdla2s4Powder mixes, and is fully ground, and calcines at high temperature, prepared composite photo-catalyst, and this complex light is urged
Agent not only can be used for administering dye wastewater in catalytic degradation organic pollution under ultraviolet light, particularly organic
The sewage that dyestuff such as azo dyes cause.
The detailed description below present invention.
According to the first aspect of the invention, provide a kind of composite photo-catalyst, this composite photo-catalyst includes cdla2s4With
Sic, wherein, based on cdla2s4Weight meter, the weight fraction of sic is 0.1%～20%, preferably 0.3%～15%, more excellent
Elect 0.5%～10%, more preferably 0.8%～5% as, still more preferably for 1%～3%.
The x-ray diffraction spectrum of this composite photo-catalyst the angle of diffraction 2 θ be about 18.03 °, 20.74 °, 24.72 °,
At 26.50 °, 27.97 °, 30.29 °, 43.91 °, 52.05 °, 53.95 °, 35.65 °, 41.46 °, 59.98 ° and 75.26 ° respectively
Exist (111), (200), (120), (121), (220), (300), (303), (422), (501), (111), (200), (220),
(203) crystallographic plane diffraction peak.
Fig. 2 c illustrates that embodiment 2 is obtained the scanning electron microscope (SEM) photograph of sample, and its pattern is regular club shaped structure, with cdla2s4With
Sic is significantly different, illustrates that the photochemical catalyst that the present invention provides is compound, rather than the physical mixed that two kinds of materials are simple.
The trans cis photoisomerization of this composite photo-catalyst is as shown in figure 3, equally show in the range of wavelength is for 515-530nm
Go out similar signal peak, but peak intensity will be compared with cdla2s4Weak is many, i.e. photo-generated carrier (electron-hole pair) compound several
Rate is lower, and photocatalytic activity is higher.
The electrochemical impedance performance of this composite photo-catalyst as shown in figure 4, its nyquist radius of circle be significantly less than sic and
cdla2s4Nyquist radius of circle, i.e. the electrical conductivity of this composite photo-catalyst is big.
The ultraviolet catalytic activity of this composite photo-catalyst is as shown in figure 5, compare cdla2s4Or sic significantly increases.
According to the second aspect of the invention, provide a kind of method preparing above-mentioned composite photo-catalyst, the method includes
Following steps:
Step 1, cdla2s4Preparation, including following sub-step:
(1-1) by cd (no3)2·4h2o、la(no3)3·6h2O and thiocarbamide are placed in water, at high temperature isothermal reaction, system
Obtain sediment；
In the present invention, cd (no3)2·4h2The mole of o is with the molar amount of cd element therein, la (no3)3·
6h2The mole of o makes cd with the molar amount of la element therein, the mole of thiocarbamide with the molar amount of s element therein
(no3)2·4h2The mole of o, la (no3)3·6h2The ratio of the mole of the mole of o and thiocarbamide is cd (no3)2·4h2o:la
(no3)3·6h2O: thiocarbamide=1:(2～3): (4～8), preferably cd (no3)2·4h2o:la(no3)3·6h2O: thiocarbamide=1:
(2～3): (4～5).
The present invention selects to prepare one of component cdla in compound with hydro-thermal method2s4, cd (no3)2·4h2o、la(no3)3·
6h2O and thiocarbamide can reach that molecular level is other to be sufficiently mixed in aqueous, then in HTHP, preferably 100～170 DEG C, more
Preferably 120～165 DEG C, react under most preferably 140～160 DEG C and corresponding pressure, homogeneous cdla can be obtained2s4, pass through
The method of separation of solid and liquid can be by water-fast solid product cdla2s4Separate, with this cdla2s4As compound
Matrix material contributes to the lifting of composite photo-catalyst performance.
(1-2) sediment being obtained in step (1-1) is separated from reaction system, wash, be dried, obtain cdla2s4
Sample.
After step (1-1) reaction, in system, naturally separate out cdla2s4Solid, after cooling, its amount of precipitation increases, therefore,
The present invention preferably lower the temperature after to the cdla in system2s4Carry out separating, the present invention is not specially limited to detached method, permissible
Using laboratory or any one method of carrying out separation of solid and liquid industrial, such as suction filtration, centrifugation etc..
Wash to separating the solid obtaining, can be washed using washing or alcohol, preferably select ethanol and washed, on the one hand
The organic matter of residual in most solid can be washed, on the other hand can be with the drying of accelerating solid.
The cdla that the present invention is obtained2s4There is good resistance to elevated temperatures, can be using the side of constant pressure and dry or drying under reduced pressure
Method, baking temperature may be selected 50～200 DEG C, preferably 60～150 DEG C, more preferably 70～120 DEG C.
Optionally, the present invention, after step 1, can also comprise the following steps:
The pretreatment of (1 ') sic, this step includes following sub-step:
Sic powder is calcined by (1 ' -1) at high temperature, then impregnates in hf solution, prepared sic suspension.
Sic used by the present invention can be commercially available sic powder, and the mesh number that such as rich abrasive material Nai Cai factory of unit of Dengfeng City produces is
The carborundum of 320 mesh.The present inventor it has been investigated that, the photocatalytic activity of photochemical catalyst strengthens with the reduction of its particle,
Therefore, the present invention preferably selects the silicon carbide powder that particle is little, mesh number is big as raw material.
According to the preferred embodiment of the present invention, before using sic, according to above step, pre- place can be carried out to sic
Reason.This have the advantage that, in commercial carbonized silicon, typically contain the impurity such as minimal amount of organic matter and silica, thus one
Determine the activity of composite photo-catalyst can be reduced on degree.It is therefore preferable that pre-processing to sic, wherein may be contained with removing
Impurity.
Preferably, high-temperature calcination process can be carried out to commercially available sic, organic matter present in it is decomposed into water and two
Carbonoxide is although the present invention is not specially limited to calcining heat, but so that organic substance therein is all decomposed into preferably, such as
Calcining heat is selected to be 300 DEG C～900 DEG C, preferably 400 DEG C～800 DEG C, more preferably 500 DEG C～800 DEG C.
Because silica etc. can be reacted with hydrofluoric acid solution, generate soluble compound and soluble in water, and sic is not
React with hydrofluoric acid, therefore, the present invention is preferably by commercially available sic powder infusion in a solution of hydrofluoric acid.
Because hydrofluoric acid has stronger corrosivity, therefore, the present invention uses the concentration of hydrofluoric acid solution more than 0.1%
Less than 5%, that is, 0.1%～5%, when hydrofluoric acid solution concentration is more than 5%, hydrogen fluoride gas therein easily escape reactant
System, and corrode instrument and equipment, or even threaten operator safety, and when the concentration of hydrofluoric acid solution is less than 0.1%, its concentration
Too small and the impurity such as the silica in sic powder can not be eliminated, the concentration of the preferred hydrofluoric acid solution of the present invention is 1%～
4%, more preferably 1.5%～3%, such as 2%.
The present invention was not specially limited to the time of dipping, can make be difficult to remove whole turns therein by calcining
It is preferred for turning to soluble compounds, such as selects dip time to be 1～20 hour, preferably 2～15 hours, more preferably 3～10
Hour.
The sic suspension that step (1 ' -1) is obtained is carried out separating by (1 ' -2), and washs, does to separating the solid obtaining
Dry, prepared sic sample.
Because sic exists after treatment in system in solid form, and impurity is then converted into soluble compounds dissolving
In reaction system, therefore, the sic suspension obtaining in step (1 ' -1) is carried out separation of solid and liquid by the present invention, the present invention to point
From mode be not specially limited, can using laboratory or any one method of carrying out separation of solid and liquid industrial, such as suction filtration,
Centrifugation etc..
The present invention is also not specially limited to cleaning solution, can be can use using laboratory or industrial any one or a few
Cleaning solution, such as distilled water, deionized water or ethanol etc..
The present invention selects to be dried process to the product obtaining after washing, so that the sic after process can be effectively disperseed,
Such that it is able to step 1 in be obtained cdla2s4Uniformly mix.
The present invention is not specially limited to baking temperature, and such as preferred baking temperature is 50 DEG C～300 DEG C, preferably 70 DEG C～
250 DEG C, more preferably 90 DEG C～200 DEG C.
Step 2, composite photo-catalyst sic/cdla2s4Preparation, including following sub-step:
(2-1) weigh the cdla of preparation in step 1 respectively2s4The sic pretreated with step 2 carries out mixed grinding, will grind
Mixed-powder after mill is placed in the container filling solvent.
According to cdla in composite photo-catalyst2s4With the weight ratio of sic, weigh cdla respectively2s4And sic, prepared for making
The photocatalysis effect of composite photo-catalyst is more excellent, and the present invention selects sic and cdla2s4Weight than for 0.1%～20%, preferably
For 0.3%～15%, more preferably 0.5%～10%, more preferably 0.8%～5%, still more preferably for 1%～
3%.
Due to the cdla being obtained in the present invention2s4With sic in pretreatment process all through washing drying and other steps, therefore,
Inevitably form the material of some inclusions, for making cdla2s4Can be sufficiently mixed uniformly with sic, shape in subsequent step
Become the compound of regular appearance, the present invention selects to cdla2s4It is ground with the mixture of sic, and the mixing that grinding is obtained
Powder disperses in water, forms uniform dispersion.
In the present invention, it is preferred to process to dispersion using ultrasonic method, make cdla2s4Divide in water with sic
Dissipate and must be more uniformly distributed so as to form the regular compound of appearance in subsequent calcination recombination process.
In the present invention, it is preferred to the ultrasonic time is 1～200 minute, preferably 10～150 minutes, more preferably 20～
100 minutes, preferably ultrasonic power was 20khz～500mhz, more preferably 50khz～100mhz, more preferably
100khz～1000khz.
(2-2) remove solvent, drying, then calcine at high temperature, cool down after calcining, obtain composite photo-catalyst.
The present invention prepares compound using calcination method, therefore, first removes the solvent in above-mentioned dispersion and drying, this
Bright the method removing solvent is not specially limited, can using laboratory or industrial any one can remove the side of solvent
Method, the method such as such as filters, evaporates；The present invention is also not specially limited to the method being dried, and can adopt laboratory or industrial
Any one method said mixture being dried, such as constant pressure and dry or drying under reduced pressure etc..
For making sic and cdla2s4More fully compound, it is 300 DEG C～800 DEG C that the present invention selects calcining heat, preferably
350 DEG C～600 DEG C, such as 450 DEG C, calcination time is 1～10 hour, preferably 2～8 hours, more preferably 3～6 hours, such as 5
Hour.
According to a third aspect of the present invention, above-mentioned composite photo-catalyst is provided to administer organic dyestuff sewage, particularly azo
The application of class dye wastewater aspect.
Azo dyes is most a kind of dyestuffs in kind quantity in existing Dyestuff Market, contains azo group by dye molecule
And gain the name.In its production process, topmost chemical process is diazotising and coupling reaction, and its course of reaction is simultaneously subject to multiple reactions
The impact of condition.Azo dyes has the advantages that because synthesis technique is simple, with low cost, dyeability projects in application, but
It is that it can occur reduction reaction to form carcinogenic aromatic amine compound, therefore part azo dyes is disabled.
The model compound with methyl orange as light-catalyzed reaction for the present invention, with terephthalic acid (TPA) as probe molecule to mn-
The ultraviolet liquid-phase catalysis activity of biocl photochemical catalyst and ultraviolet solid catalysis activity are measured.
It is because methyl orange is typical azo dyes using methyl orange as model compound, and its chemical property is steady
Fixed, will not decompose under the action of uv light, deduction can be avoided during experiment blank, reduce error, improve the efficiency of experiment；And
And, methyl orange can pass through absorbance and concentration curve, directly calculates resolution ratio, calculates easy to be reliable；Additionally, methyl orange is real
Test more ripe, degree of recognition is high, and result is easily accepted.
The photocatalytic activity to organic pollution of the composite photo-catalyst that the present invention provides is with sic and cdla2s4Weight
The increase of amount ratio first increases and reduces, as sic and cdla again2s4Quality ratio be that the degradation rate of photochemical catalyst when 1.0% reaches
Height, but the ultraviolet catalytic activity of composite photo-catalyst is above simple cdla2s4Or sic.
By adding scavenger experiment it is known that the composite photo-catalyst that the present invention provides can be at it under ultraviolet light
Surface forms catalysis organic dyestuff, and the free radical that particularly azo dyes decompose, thus be catalyzed the decomposition of organic dyestuff.
Based on above experimental result, under without being bound by any theory, inventors believe that, it is more than or equal to energy
Light irradiation sic/cdla of its conductor energy gap2s4Photochemical catalyst, the electronics being in valence band will be excited on conduction band,
Hole (h is produced on valence band+), thus in sic/cdla2s4Photocatalyst surface produces the electron-hole with high activity
Right, this electron-hole pair is the activated centre of light-catalyzed reaction, has very strong oxidability, can will be adsorbed in sic/
cdla2s4Oh- and h of photocatalyst surface2O is aoxidized, and produces the oh free radical with strong oxidizing property.
The reaction of oh free radical can be 402.8mj/mol, and it is by the hydroxyl adduction between pollutant, replacement, electricity
Son transfer etc. can destroy to c-c, c-h, the c-o and n-h key in pollutant, has the ability of efficient-decomposition pollutant,
Make pollutant all or close to whole mineralisings, contaminant degradation is the innocuous substance such as carbon dioxide, water, meanwhile, hole the most at last
Itself also can will be adsorbed in sic/cdla2s4The organic matter direct oxidation of photocatalyst surface is decomposed, additionally, sic/cdla2s4Light
The high activity electronics that catalyst surface produces has very strong reducing power, when there being o in solution2In the presence of, light induced electron meeting and o2
Effect generates o2 -, o2 -Again with h+Effect generates ho2, ultimately generate oh free radical, oxidative degradation organic matter.
Embodiment
The mesh number that in the present embodiment and comparative example, sic sample used is purchased from the production of rich abrasive material Nai Cai factory of unit of Dengfeng City is 320
Purpose carborundum.
Embodiment 1
(1)cdla2s4The preparation of sample
(1-1) by 2.3799g cd (no3)2·4h2o、6.6896g la(no3)3·6h2The thiocarbamide of o and 2.5365g is placed in
In 60ml distilled water, resulting solution is added in the stainless steel autoclave of the polytetrafluoroethylsubstrate substrate of 100ml capacity, in 433k
Isothermal reaction 72h under (about 160 DEG C), obtains yellow mercury oxide,
(1-2) use the yellow mercury oxide being obtained in absolute ethyl alcohol rinsing step (1-1), and vacuum is done under 333k (about 60 DEG C)
Dry, obtain cdla2s4Sample；
The pretreatment of (1 ') sic
Sic powder is placed in calcining 3h in the Muffle furnace of 973k (about 700 DEG C) by (1 ' -1), is placed in afterwards in 2%hf solution
Dipping 5h,
Solution is carried out suction filtration by (1 ' -2), and with distillation water wash 3 times, finally 12h is dried in 393k (about 120 DEG C) and obtains
Sic sample；
(2)sic/cdla2s4The preparation of catalyst sample
(2-1) accurately weigh the cdla of preparation in 0.5000g step (1) respectively2s4Enter with pretreated 0.0025gsic
Row mixing, is placed in agate mortar and grinds 20min, and the mixed-powder after grinding is transferred to the small beaker filling 30ml distilled water
In, ultrasonically treated 30min,
(2-2) remove water in the water-bath of 383k (about 110 DEG C), be evaporated, in the Muffle furnace calcining of 723k (about 450 DEG C)
2h, natural cooling, obtain composite catalyst sample sic/cdla2s4, in this sample, the weight fraction of sic is 0.5%.
Embodiment 2
The present embodiment method therefor is same as Example 1, differs only in and adds 0.005g sic in step (2-1), system
Obtain composite catalyst sample sic/cdla2s4The weight fraction of middle sic is 1.0%.
Embodiment 3
The present embodiment method therefor is same as Example 1, differs only in and adds 0.010g sic in step (2-1), system
Obtain composite catalyst sample sic/cdla2s4The weight fraction of middle sic is 2.0%.
Embodiment 4
The present embodiment method therefor is same as Example 1, differs only in and adds 0.020g sic in step (2-1), system
Obtain composite catalyst sample sic/cdla2s4The weight fraction of middle sic is 4.0%.
Embodiment 5
(1)cdla2s4The preparation of sample
(1-1) by 2.3799g cd (no3)2·4h2o、10.0376g la(no3)3·6h2The thiocarbamide of o and 3.5346g is put
In 60ml distilled water, resulting solution is added in the stainless steel autoclave of the polytetrafluoroethylsubstrate substrate of 100ml capacity, in 443k
Isothermal reaction 60h under (about 170 DEG C), obtains yellow mercury oxide,
(1-2) use the yellow mercury oxide being obtained in absolute ethyl alcohol rinsing step (1-1), and vacuum under 473k (about 200 DEG C)
It is dried, obtain cdla2s4Sample；
The pretreatment of (1 ') sic
Sic powder is placed in calcining 3h in the Muffle furnace of 873k (about 600 DEG C) by (1 ' -1), is placed in 0.2%hf solution afterwards
Middle dipping 10h,
Solution is carried out suction filtration by (1 ' -2), and with distillation water wash 3 times, finally 12h is dried in 373k (about 100 DEG C) and obtains
Sic sample；
(2)sic/cdla2s4The preparation of catalyst sample
(2-1) accurately weigh the cdla of preparation in 0.5000g step (1) respectively2s4Enter with pretreated 0.0030gsic
Row mixing, is placed in agate mortar and grinds 20min, and the mixed-powder after grinding is transferred to the small beaker filling 30ml distilled water
In, ultrasonically treated 30min,
(2-2) remove water in the water-bath of 383k (about 110 DEG C), be evaporated, in the Muffle furnace calcining of 723k (about 450 DEG C)
2h, natural cooling, obtain composite catalyst sample sic/cdla2s4, in this sample, the weight fraction of sic is 0.6%.
Recording this composite catalyst to Photocatalytic Degradation of Methyl Orange rate with the method for experimental example 5 is 32.5%.
Embodiment 6
(1)cdla2s4The preparation of sample
(1-1) by 2.3650g cd (no3)2·4h2o、8.3264g la(no3)3·6h2The thiocarbamide of o and 4.6756g is placed in
In 60ml distilled water, resulting solution is added in the stainless steel autoclave of the polytetrafluoroethylsubstrate substrate of 100ml capacity, in 538k
Isothermal reaction 68h under (about 165 DEG C), obtains yellow mercury oxide,
(1-2) use the yellow mercury oxide being obtained in absolute ethyl alcohol rinsing step (1-1), and vacuum under 423k (about 150 DEG C)
It is dried, obtain cdla2s4Sample；
The pretreatment of (1 ') sic
Sic powder is placed in calcining 3h in the Muffle furnace of 1073k (about 800 DEG C) by (1 ' -1), is placed in afterwards in 4%hf solution
Dipping 5h,
Solution is carried out suction filtration by (1 ' -2), and with distillation water wash 3 times, finally 12h is dried in 323k (about 50 DEG C) and obtains sic
Sample；
(2)sic/cdla2s4The preparation of catalyst sample
(2-1) accurately weigh the cdla of preparation in 0.5000g step (1) respectively2s4Enter with pretreated 0.0075gsic
Row mixing, is placed in agate mortar and grinds 20min, and the mixed-powder after grinding is transferred to the small beaker filling 30ml distilled water
In, ultrasonically treated 30min,
(2-2) remove water in the water-bath of 383k (about 110 DEG C), be evaporated, in the Muffle furnace calcining of 723k (about 450 DEG C)
2h, natural cooling, obtain composite catalyst sample sic/cdla2s4, in this sample, the weight fraction of sic is 1.5%.
Recording this composite catalyst to Photocatalytic Degradation of Methyl Orange rate with the method for experimental example 5 is 43.6%.
Embodiment 7
(1)cdla2s4The preparation of sample
(1-1) by 2.3650g cd (no3)2·4h2o、9.9872g la(no3)3·6h2The thiocarbamide of o and 2.9312g is placed in
In 60ml distilled water, resulting solution is added in the stainless steel autoclave of the polytetrafluoroethylsubstrate substrate of 100ml capacity, in 393k
Isothermal reaction 84h under (about 120 DEG C), obtains yellow mercury oxide,
(1-2) use the yellow mercury oxide being obtained in absolute ethyl alcohol rinsing step (1-1), and vacuum under 393k (about 120 DEG C)
It is dried, obtain cdla2s4Sample；
The pretreatment of (1 ') sic
Sic powder is placed in calcining 4h in the Muffle furnace of 573k (about 300 DEG C) by (1 ' -1), is placed in afterwards in 3%hf solution
Dipping 3h,
Solution is carried out suction filtration by (1 ' -2), and with distillation water wash 3 times, finally 12h is dried in 473k (about 200 DEG C) and obtains
Sic sample；
(2)sic/cdla2s4The preparation of catalyst sample
(2-1) accurately weigh the cdla of preparation in 0.5000g step (1) respectively2s4Enter with pretreated 0.0125gsic
Row mixing, is placed in agate mortar and grinds 20min, and the mixed-powder after grinding is transferred to the small beaker filling 30ml distilled water
In, ultrasonically treated 30min,
(2-2) remove water in the water-bath of 383k (about 110 DEG C), be evaporated, in the Muffle furnace calcining of 723k (about 450 DEG C)
2h, natural cooling, obtain composite catalyst sample sic/cdla2s4, in this sample, the weight fraction of sic is 2.5%.
Recording this composite catalyst to Photocatalytic Degradation of Methyl Orange rate with the method for experimental example 5 is 35.2%.
Comparative example
Comparative example 1
This comparative example only carries out step (1) in embodiment 1, prepared cdla2s4Sample.
Comparative example 2
This comparative example only carries out step (2) in embodiment 1, obtains pretreated sic.
Experimental example
The xrd spectroscopic assay of experimental example 1 sample
This experimental example specimen in use is to prepare in embodiment 1～4 and comparative example 1 and comparative example 2, and test condition is:
Bruker d8advance type x-ray diffraction instrument (xrd), copper target (cu k α, λ=0.154nm) ray, ni filters
Piece, operating voltage 40kv, electric current 40ma, sweep limits 2 θ=15 °～80 °.
Sample xrd spectrogram result is as shown in figure 1, as shown in Figure 1:
cdla2s4The angle of diffraction 2 θ be about 18.03 °, 20.74 °, 24.72 °, 26.50 °, 27.97 °, 30.29 °, 43.91 °,
52.05 °, be respectively present (111), (200), (120), (121), (220), (300), (303), (422), (501) at 53.95 °
The diffraction maximum of crystal face.(curve a)
Sic the angle of diffraction 2 θ about 2 θ be about 35.65 °, 41.46 °, 59.98 °, 71.81 °, be respectively present at 75.26 °
(111), (200), (220), (311), the diffraction maximum of (203) crystal face.(curve f)
The sic/cdla that embodiment 1～4 is obtained2s4Composite photo-catalyst sample the angle of diffraction 2 θ be about 18.03 °,
20.74 °, 24.72 °, 26.50 °, 27.97 °, 30.29 °, 43.91 °, 52.05 °, be respectively present at 53.95 ° (111), (200),
(120), (121), (220), (300), (303), (422), the diffraction maximum of (501) crystal face, these peaks are cdla2s4Diffraction maximum；
In addition, the angle of diffraction 2 θ be about 35.65 °, 41.46 °, 59.98 °, be respectively present at 75.26 ° (111), (200), (220),
(203) crystallographic plane diffraction peak, these are sic diffraction maximum, and above-mentioned diffraction maximum can absolutely prove sic and cdla2s4Obtain sufficiently multiple
Close.
The scanning electron microscope (SEM) photograph of experimental example 2 sample
This experimental example specimen in use is to prepare in embodiment 1～4 and comparative example 1 and comparative example 2, and test condition is:
Nova nano 230 electron microscope, scans accelerating potential 0.1～30kv, and the vacuum of sample room is less than 2.7 ×
10-5pa.
The result of the ESEM of sample as shown in Fig. 2 a～2c,
The cdla being obtained from Fig. 2 a, comparative example 12s4It is aggregate；
From Fig. 2 b, the sic that comparative example 2 is obtained is granular pattern；
From Fig. 2 c, sic/cdla2s4Composite catalyst is regular club shaped structure, sic and cdla is described2s4Obtain
The compound more uniform material of ratio, rather than the physical mixed that two kinds of materials are simple.
The trans cis photoisomerization figure of experimental example 3 sample
Photoluminescence spectra (pl) is a kind of effective ways of research semiconductor nano material electronic structure and optical property,
The architectural characteristics such as surface defect and the surface Lacking oxygen of semiconductor nano material can be disclosed, and photo-generated carrier (electronics-sky
Cave to) separation and the information such as compound, thus for preparation and providing strong foundation using high-performance semiconductor material.
This experimental example specimen in use is to prepare in embodiment 2 and comparative example 1, and test condition is:
The model fl/fs920 XRF that instrument produces for edinburgh company, detector is photoelectricity times
Increase pipe, sample carries out stable state and transient photoluminescence (pl) test by compressing tablet pattern.
Wherein, stable state pl measures at normal temperatures, and photoluminescent light source is xenon lamp；Transient state pl is surveyed under the conditions of 77k (liquid nitrogen)
Fixed, photoluminescent light source is millisecond flashing lamp, and excitation wavelength is 325nm.
The trans cis photoisomerization figure of sample is as shown in figure 3, as shown in Figure 3:
cdla2s4Catalyst sample shows stronger luminous signal in the range of wavelength is for 515-530nm；Embodiment 2 is made
The composite catalyst sample obtaining equally shows similar signal peak in the range of wavelength is for 515-530nm, but peak intensity will
Compared with cdla2s4Weak is many, and it is generally believed that fluorescence signal is stronger, the recombination probability of photo-generated carrier (electron-hole pair) is got over
Height, photocatalytic activity is lower, i.e. the activity of the composite catalyst that embodiment 2 is obtained is significantly stronger than what comparative example 1 was obtained
cdla2s4Sample, the composite photo-catalyst activity order that this experimental result is recorded with previous experiments is consistent.
The electrochemical impedance performance measurement of experimental example 4 sample
This experimental example uses the sample of preparation in embodiment 2 and comparative example 1 and comparative example 2, and test condition is:
Electrochemical impedance (eis) is tested on zennium electrochemical workstation, and this experimental example adopts drop-coating to prepare
Catalyst sample membrane electrode, tests the photoelectrochemical behaviour of catalyst using the three-electrode system of standard, and electrolyte is
0.2mol·l-1na2so4, it is seen that light source is produced by " xenon lamp+420nm optical filter combines ", concrete grammar is as follows for solution:
(1) conduction of a 0.5 × 0.5cm is cooked up in clean fto electro-conductive glass (2 × 1cm) conducting surface adhesive tape
Face.By 0.0500g catalyst ultrasonic disperse in 800 μ ldmf, and pipette the suspended drop-coated of 20 μ l in the conducting surface planned
On, dry at room temperature, electrode is saved in standby in closed enclosure.
(2) in three-electrode system, pt piece is as to electrode, ag/agcl (3mol l-1) as reference electrode, sample electricity
Pole, as working electrode, in test process, eliminates even the brought experiment of non-uniform film thickness using the incident mode that backlight is shone
Error.
The electrochemical impedance performance of sample is as shown in figure 4, as shown in Figure 4:
The sic/cdla that embodiment 2 is obtained2s4The sic that the nyquist radius of circle of composite photo-catalyst is obtained with comparative example 2
The cdla being obtained with comparative example 12s4Comparing hence it is evident that reducing, showing sic in cdla2s4After load, the electrical conductivity of sample obtains necessarily
Increase, impedance is also little.It is not bound by any theory, inventors believe that, composite photo-catalyst is conducive to carrier
Separating and interfacial migration, thus suppressing the compound of carrier, and then improving the UV degradation ability of composite photo-catalyst, above-mentioned knot
Also (referring specifically to experimental example 5) can be verified by from the experiment of catalyst photo-catalytic degradation of methyl-orange.
The ultraviolet catalytic activity of experimental example 5 sample
This experimental example specimen in use is to prepare in embodiment 1～4 and comparative example 1 and comparative example 2, and method of testing is:
Accurately weigh 0.0500g comparative example 1, embodiment 1, embodiment 2, embodiment 3, embodiment 4 and comparative example 2 respectively to make
The sample obtaining, is respectively put in 6 quartz ampoules, is numbered a～f, be sequentially added into 40ml in above-mentioned 6 fragmented quartz ampoules
Concentration is 5.00mg l-1Methyl orange solution, and add a magneton.
Quartz ampoule is put in photochemical reaction instrument, under continuous stirring, dark reaction processes 30min, sampling centrifugation, difference
Survey its absorbance a0.Turn on lamp power supply, carry out photo-irradiation treatment 1h, sampling centrifugation, survey its absorbance at respectively, according to the following formula 1 meter
Calculation degradation rate:
W (%)=(a0-at)/a0 × 100% formula i
And degradation rate is depicted as block diagram, as shown in Figure 5.As shown in Figure 5:
The photocatalytic activity to organic pollution of composite photo-catalyst is with sic and cdla2s4Weight ratio increase first
Increase and reduce again, as sic and cdla2s4Quality ratio be that the degradation rate of photochemical catalyst when 1.0% reaches highest, be 49.9%；
The ultraviolet catalytic activity of composite photo-catalyst is above simple cdla2s4Or sic.
The impact to photochemical catalyst photocatalytic activity for experimental example 6 scavenger
This experimental example uses the sample that sample is embodiment 2 preparation, and method of testing is:
Accurately weigh six parts of 0.0500g sic-cdla2s4(1%) catalyst fines is respectively placed in six quartz ampoules, compiles
Numbers 1,2,3,4,5 and 6, all add 40ml concentration to be 5.00mg l successively-1Methyl orange solution, without any clear in No. 1 pipe
Except agent, in No. 2 pipes, add 0.0040g ammonium oxalate, add 0.0040g 1,4-benzoquinone in No. 3 pipes, in No. 4 pipes, add 3.800 μ l peroxides
Change hydrogen enzyme, in No. 5 pipes, add 5.000 μ l isopropanols, in No. 6 pipes, add 0.0040g nano3, then add one in each Guan Zhongjun
Magneton, above-mentioned each quartz ampoule is put in photochemical reaction instrument, under continuous stirring, carry out dark reaction process 30min, sample from
The heart, surveys its absorbance a0 respectively, turns on lamp power supply, carries out ultraviolet lighting and processes 1h, sampling centrifugation, surveys its absorbance at respectively,
I calculating degradation rate according to the following formula:
W (%)=(a0-at)/a0 × 100% formula i
According to the experimental data recording, calculate the degradation rate of each sample when adding different scavenger, degraded by gained
Rate is drawn out each catalyst sample and is added the block diagram to 40ml methyl orange solution (5.00mg/l) degradation rate after scavenger, such as Fig. 6
Shown.
Wherein, added scavenger isopropanol can oh in capture system；
nano3Can free electron e in capture system-,
Catalase can be with h in catalyst system and catalyzing2o2Decomposition；
Ammonium oxalate can hole in capture system；
1,4-benzoquinone can o in capture system2 -.
It will be appreciated from fig. 6 that isopropanol (ipa) and nano3Add impact very little to catalyst UV active, can neglect
Slightly, compared with without scavenger, in the case of other conditions identical, photo-catalytic degradation of methyl-orange under ultraviolet light
During oh and be not main active specy；
Add catalase (cat), after ammonium oxalate (ao) and 1,4-benzoquinone (bq), the activity of catalyst all has more obvious
Reduction, the addition of particularly 1,4-benzoquinone (bq) makes the activity of catalyst have to compare and significantly decrease that is to say, that h2o2、
h+And o2 -Function both on, particularly o2 -Photocatalytic process plays a major role.
Above in association with specific embodiment and exemplary example, the present invention is described in detail, but these explanations are simultaneously
It is not considered as limiting the invention.It will be appreciated by those skilled in the art that without departing from the spirit and scope of the invention,
Multiple equivalencings, modification or improvement can be carried out to technical solution of the present invention and embodiments thereof, these each fall within the present invention
In the range of.Protection scope of the present invention is defined by claims.
Claims (5)
1. a kind of composite photo-catalyst sic/cdla administering contaminated wastewater2s4Preparation method, this composite photo-catalyst includes
Sic and cdla2s4, based on cdla2s4Weight meter, the weight fraction of sic is 0.1%～20%,
It is characterized in that, the method comprises the following steps:
(1)cdla2s4Preparation, including following sub-step:
(1-1) by cd (no3)2·4h2o、la(no3)3·6h2O and thiocarbamide are placed in water, cd (no3)2·4h2The mole of o with
The molar amount of cd element therein, la (no3)3·6h2The mole of o with the molar amount of la element therein, the rubbing of thiocarbamide
You measure with the molar amount of s element therein, make cd (no3)2·4h2The mole of o, la (no3)3·6h2The mole of o and sulphur
The ratio of the mole of urea is cd (no3)2·4h2o:la(no3)3·6h2O: thiocarbamide=1:(2～3): (4～8), 100～170
DEG C high temperature under isothermal reaction, prepared sediment；
(1-2) sediment being obtained in step (1-1) is separated from reaction system, wash, be dried, obtain cdla2s4Sample
Product；
(2) composite photo-catalyst sic/cdla2s4Preparation, including following sub-step:
(2-1) weigh the cdla of preparation in step (1) respectively2s4Carry out mixed grinding with sic, the mixed-powder after grinding is put
In the container filling solvent；
(2-2) solvent, drying, calcining are removed, calcining heat is 300 DEG C～900 DEG C, cools down, obtain composite photocatalyst after calcining
Agent sic/cdla2s4, according to x-ray diffraction analyze, its angle of diffraction 2 θ be 18.03 °, 20.74 °, 24.72 °, 26.50 °,
It is respectively present at 27.97 °, 30.29 °, 43.91 °, 52.05 °, 53.95 °, 35.65 °, 41.46 °, 59.98 ° and 75.26 °
(111)、(200)、(120)、(121)、(220)、(300)、(303)、(422)、(501)、(111)、(200)、(220)、(203)
Crystallographic plane diffraction peak.
2. method according to claim 1 is it is characterised in that after step (1), before step (2), also include following
Step:
The pretreatment of (1 ') sic, this step includes following sub-step:
Sic powder is calcined under 300 DEG C～900 DEG C of high temperature by (1 ' -1), then impregnates in hf solution, prepared sic suspension；
The sic suspension that step (1 ' -1) is obtained is carried out separating by (1 ' -2), and washs, is dried to separating the solid obtaining, system
Obtain sic sample.
3. method according to claim 1 is it is characterised in that in step (1-1), temperature is 120～165 DEG C.
4. method according to claim 3 is it is characterised in that in step (1-1), temperature is 140～160 DEG C.
5. method according to claim 2 is it is characterised in that in step (1 ' -1), the concentration of hydrofluoric acid solution is 0.1%
～5%.
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