CN115337917B - Preparation method of selenium-rich modified biochar for adsorbing cadmium - Google Patents
Preparation method of selenium-rich modified biochar for adsorbing cadmium Download PDFInfo
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- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 title claims abstract description 62
- 229910052711 selenium Inorganic materials 0.000 title claims abstract description 62
- 239000011669 selenium Substances 0.000 title claims abstract description 62
- 229910052793 cadmium Inorganic materials 0.000 title claims abstract description 21
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000010000 carbonizing Methods 0.000 claims abstract description 12
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- 238000001035 drying Methods 0.000 claims description 12
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- 238000000227 grinding Methods 0.000 claims description 5
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- 238000007605 air drying Methods 0.000 claims description 4
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- 239000007788 liquid Substances 0.000 claims description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 25
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- 235000009566 rice Nutrition 0.000 abstract description 22
- 239000002351 wastewater Substances 0.000 abstract description 12
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- 238000012986 modification Methods 0.000 abstract description 3
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- 230000000052 comparative effect Effects 0.000 description 8
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- BVTBRVFYZUCAKH-UHFFFAOYSA-L disodium selenite Chemical compound [Na+].[Na+].[O-][Se]([O-])=O BVTBRVFYZUCAKH-UHFFFAOYSA-L 0.000 description 5
- 239000011148 porous material Substances 0.000 description 5
- 238000000197 pyrolysis Methods 0.000 description 5
- 229960001471 sodium selenite Drugs 0.000 description 5
- 239000011781 sodium selenite Substances 0.000 description 5
- 235000015921 sodium selenite Nutrition 0.000 description 5
- 239000003054 catalyst Substances 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 3
- 239000012190 activator Substances 0.000 description 3
- 210000000988 bone and bone Anatomy 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000011575 calcium Substances 0.000 description 3
- 229910001424 calcium ion Inorganic materials 0.000 description 3
- 230000000536 complexating effect Effects 0.000 description 3
- 238000010668 complexation reaction Methods 0.000 description 3
- 238000005342 ion exchange Methods 0.000 description 3
- 238000001000 micrograph Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- -1 acts in organisms Chemical compound 0.000 description 2
- 159000000007 calcium salts Chemical class 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 238000005341 cation exchange Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 229910021645 metal ion Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
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- 102000004169 proteins and genes Human genes 0.000 description 2
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- 229940082569 selenite Drugs 0.000 description 2
- MCAHWIHFGHIESP-UHFFFAOYSA-L selenite(2-) Chemical compound [O-][Se]([O-])=O MCAHWIHFGHIESP-UHFFFAOYSA-L 0.000 description 2
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- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
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- KDXKERNSBIXSRK-UHFFFAOYSA-N Lysine Natural products NCCCCC(N)C(O)=O KDXKERNSBIXSRK-UHFFFAOYSA-N 0.000 description 1
- 239000004472 Lysine Substances 0.000 description 1
- 208000001132 Osteoporosis Diseases 0.000 description 1
- 102000004316 Oxidoreductases Human genes 0.000 description 1
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- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000003321 atomic absorption spectrophotometry Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229940065285 cadmium compound Drugs 0.000 description 1
- AQCDIIAORKRFCD-UHFFFAOYSA-N cadmium selenide Chemical compound [Cd]=[Se] AQCDIIAORKRFCD-UHFFFAOYSA-N 0.000 description 1
- WLZRMCYVCSSEQC-UHFFFAOYSA-N cadmium(2+) Chemical compound [Cd+2] WLZRMCYVCSSEQC-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
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- 150000002500 ions Chemical class 0.000 description 1
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- 238000010298 pulverizing process Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28054—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their surface properties or porosity
- B01J20/28057—Surface area, e.g. B.E.T specific surface area
- B01J20/28059—Surface area, e.g. B.E.T specific surface area being less than 100 m2/g
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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- B01J2220/00—Aspects relating to sorbent materials
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- B01J2220/4812—Sorbents characterised by the starting material used for their preparation the starting material being of organic character
- B01J2220/4825—Polysaccharides or cellulose materials, e.g. starch, chitin, sawdust, wood, straw, cotton
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Abstract
A preparation method of selenium-enriched modified biochar for adsorbing cadmium is characterized by comprising the following steps of: adding selenium-rich rice husk into CaCl 2 Immersing in hydrochloric acid solution for 20-24h, baking, and carbonizing at 300-700 deg.C for 0.5-1.5h. The selenium-enriched biochar prepared by the method has 31.79m 2 Specific surface area per g, selenium element in the biochar plays a role in promoting adsorption of Cd after modification 2+ Is cooperated with other multiple mechanisms to improve the heavy metal Cd in the wastewater 2+ For Cd having a concentration of 100mg/L 2+ The adsorption amount was 51.7mg/g.
Description
Technical Field
The invention relates to the technical field of heavy metal wastewater treatment, in particular to a preparation method of selenium-enriched modified biochar for adsorbing cadmium.
Background
Cadmium (Cd) is a heavy nonferrous metal that has extremely strong enrichment and is harmful to living beings, recognized by the european union as a highly hazardous toxic and carcinogenic substance. It can accumulate in human body through food chain, drinking water etc. ways, and produce serious harm to human health: the calcium ion protein in the human body can actively absorb cadmium element to cause disturbance of calcium ion metabolism, cadmium is more sulfur-philic than calcium, cadmium ions can replace very much calcium ions, even calcium in bones can be replaced, and when cadmium is poisoned, a large amount of calcium in bones is discharged from urine, so that osteoporosis, softening and porosities of the human body are caused; at the same time, cadmium affects lysine oxidase activity, an enzyme which is a cupronidase and plays a decisive role in the maturation of bone collagen, the effect being found in connection with "pain".
The current treatment method of the cadmium pollution wastewater comprises the following steps: precipitation, ion exchange, membrane separation and adsorption. The pure chemical repair method is complex, and the adsorption method is widely applied to Cd due to simple method, economy, high efficiency and environmental protection in order to save cost and widely popularize and use 2+ And (5) treating polluted wastewater. Biochar due to its carbon contentHigh stability, rich surface functional groups and the like, has developed pores, higher specific surface area and cation exchange capacity, and can be used as an adsorbent for adsorbing heavy metals and organic pollutants in water and soil. The biochar has wide material sources and low cost, such as agriculture and forestry waste, straw, rice husk, bamboo, leaves, pineapple peel, walnut shell and the like, and can be used as raw materials for preparing the biochar.
The biochar has different physicochemical properties such as pore structure, density, specific surface area, pH, cation exchange capacity, oxygen-containing functional groups and the like due to different preparation raw materials, pyrolysis technology and pyrolysis conditions, and the physicochemical properties are different in heavy metal ion adsorption performance.
Disclosure of Invention
The invention aims to provide a preparation method of selenium-enriched modified biochar for adsorbing cadmium. The prepared selenium-rich modified biochar can effectively fix heavy metal cadmium through multiple actions, and remarkably improves Cd in wastewater 2+ Is not limited, and the removal efficiency of the same is improved.
The invention aims at realizing the following technical scheme:
a preparation method of selenium-enriched modified biochar for adsorbing cadmium is characterized by comprising the following steps of: adding selenium-rich rice husk into CaCl 2 Immersing in hydrochloric acid solution for 20-24h, baking, and carbonizing at 300-700 deg.C for 0.5-1.5h.
Preferably, the carbonization temperature is 600-700 ℃ and the carbonization time is 1h.
Further, the temperature of the drying is 100-105 ℃ and the drying time is 10-12h.
Further, caCl as described above 2 Is prepared by adding CaCl into hydrochloric acid solution 2 Adding into hydrochloric acid solution, adjusting pH to 2-4, caCl 2 The concentration is 0.5-1.5mol/L.
Further, the selenium-rich rice hulls are prepared by spraying selenium-rich chelated water fertilizer solution on rice hulls or straws for pretreatment; the main component of selenium-rich chelated water fertilizer solution is sodium selenite, and the concentration is 20-30g/L.
Further, the soaking is to soak the rice hulls rich in selenium in CaCl 2 Heating to 80-100 deg.c and maintaining for 1-2 hr, and soaking at normal temperature for 22-16 hr.
In the prior art, the complexing detoxification effect of selenium on cadmium mainly acts in organisms, and after a series of reactions in the organisms, selenite is combined with sulfhydryl groups of proteins in the organisms, so as to complex Cd 2+ And forming selenium-cadmium compound to adsorb cadmium. But in vitro directly for Cd 2+ No complexation of (3) is reported. In addition, the raw materials such as agriculture and forestry straws and the like are rich in selenium usually by spraying selenite, decomposition or loss can occur during high-temperature pyrolysis, and finally the prepared biochar has less selenium content and most of the retained selenium is ineffective and is effective for Cd 2+ The adsorption of (2) is not obvious.
During the preparation, caCl was used 2 After the hydrochloric acid solution is soaked, hydrochloric acid has certain reducibility and reacts with sodium selenite to a certain extent, so that the content and the effectiveness of selenium in biochar can be obviously improved in the pyrolysis process, and the subsequent Cd can be obtained 2+ Has certain complexing effect on Cd in the adsorption process 2+ Has better promotion effect on adsorption.
In addition, caCO is produced by modifying calcium chloride 3 Efficient deposition of Cd by physical precipitation 2+ On the surface of biochar, hydrochloric acid is used for acting, and more acidic functional groups are generated after pyrolysis and directly react with Cd 2+ Form complexation and acid functional group and CaCO 3 React to generate calcium salt, and react with Cd 2+ Ion exchange is generated, and Cd is synergistically improved through multiple adsorption removal means 2+ Is not limited, and the removal efficiency of the same is improved.
The preparation method of the selenium-enriched modified biochar for adsorbing cadmium is characterized by comprising the following steps of:
(1) Pretreatment: crushing agriculture and forestry straw or rice husk as raw material, washing, air drying, pulverizing, sieving with 20-60 mesh sieve, spraying selenium-rich chelated water fertilizer on its surface, and placing in CaCl 2 Preserving heat for 1-2h at 80-100 ℃, then standing for 12-16h at normal temperature, and finally drying for 10-12h at 100-105 ℃;
(2) Carbonizing: carbonizing the pretreated raw material in an anoxic environment at 300-700 ℃ for 0.5-1.5h to obtain biochar;
(3) Cleaning: and cleaning the carbonized biochar to be neutral, drying at 105 ℃, grinding and sieving with a 100-mesh sieve to obtain the selenium-enriched modified biochar.
The invention has the following technical effects:
the selenium-enriched biochar prepared by the method has 31.79m 2 Specific surface area per g, selenium element in the biochar plays a role in promoting adsorption of Cd after modification 2+ Is cooperated with other multiple mechanisms to improve the heavy metal Cd in the wastewater 2+ For Cd having a concentration of 100mg/L 2+ The adsorption amount was 51.7mg/g.
Drawings
Fig. 1: the rice straw selenium-rich biochar prepared in the embodiment 1 of the invention adsorbs Cd 2+ And (5) a subsequent scanning electron microscope image.
Fig. 2: the infrared spectrogram of the selenium-enriched biochar prepared from the rice straw in the embodiment 1 of the invention.
Fig. 3: adsorption capacity comparison chart of rice straw selenium-enriched biochar prepared in embodiment 1 of the invention.
Fig. 4: the rice straw selenium-enriched biochar prepared in the embodiment 1 of the invention has Cd with different concentrations 2+ Is used as the adsorption amount of the catalyst.
Fig. 5: rice husk selenium-rich biochar pair Cd prepared by adopting different activators 2+ Is used as the adsorption amount of the catalyst.
Detailed Description
The present invention is described in detail below by way of examples, which are necessary to be pointed out herein for further illustration of the invention and are not to be construed as limiting the scope of the invention, since numerous insubstantial modifications and adaptations of the invention will be to those skilled in the art in light of the foregoing disclosure.
Example 1
The preparation method of the selenium-rich modified biochar for adsorbing cadmium comprises the following steps:
(1) Pretreatment: agricultural and forestry straw or rice husk is used as a raw material,crushing the straw to 3-5cm, washing, air-drying, crushing, sieving with a 40-mesh sieve, spraying selenium-rich chelated liquid fertilizer on the surface of the straw, and placing the straw in CaCl 2 Preserving heat for 1.5h at 90 ℃, then standing for 14h at normal temperature, and finally drying for 12h at 105 ℃;
(2) Carbonizing: carbonizing the pretreated raw material in an anoxic environment at 700 ℃ for 0.5h to obtain biochar;
(3) Cleaning: and cleaning the carbonized biochar to be neutral, drying at 105 ℃, grinding and sieving with a 100-mesh sieve to obtain the selenium-enriched modified biochar.
The main component of the selenium-rich chelated water fertilizer is sodium selenite, and the concentration is 20g/L.
The scanning electron microscope image of the selenium-enriched modified biochar prepared in the embodiment is shown in the figure 1 (b), has rough surface and rich aperture, and the specific surface area is 31.79m 2 /g。
Comparative example 1:
unlike example 1, the straw sprayed with the selenium-rich chelated water fertilizer in the scheme adopts CaCl 2 The aqueous solution was allowed to stand still for soaking for 20 hours, and the rest of the procedure was the same as in example 1.
The scanning electron microscope image of the modified biochar prepared by the scheme is shown in the figure 1 (a), and the apparent observation that the pore diameter structure of the surface of the modified biochar prepared by the method is not rich in the pore diameter of the selenium-enriched modified biochar prepared by the method, and the specific surface area is 20.23m 2 /g。
Comparative example 2:
unlike the embodiment 1, the straw raw material of the invention is not sprayed with selenium-rich chelated water fertilizer, and is directly placed in CaCl after being washed 2 The remaining steps remain the same as in example 1.
The modified biochar prepared by the scheme has the advantages that the selenium-rich chelated water fertilizer is not sprayed, more metal ions do not react with hydrochloric acid, so that the hydrochloric acid can seriously etch the straw at high temperature, partial pore diameter collapse of the straw is caused, and the specific surface area is severely reduced compared with that of the embodiment 1 and is only 17.64m 2 /L。
Cd concentration of 100mg/L 2+ The pH of the wastewater is adjusted to 5 according toAdding 0.2g of biochar into 100mL of wastewater, respectively adding the biochar prepared in example 1, comparative example 1 and comparative example 2, oscillating at 150rpm for 2h, passing through 0.45 μm water-based filter membrane, and measuring Cd in the wastewater by flame atomic absorption spectrophotometry 2+ Concentration according to Cd before and after adsorption 2+ Concentration variation to calculate equilibrium adsorption amount, as shown in FIG. 3, the biochar prepared in example 1, comparative example 1 and comparative example 2 was prepared for Cd 2+ The adsorption amounts of (C) were 51.7mg/g, 41.4mg/g and 40.1mg/g. By regulating Cd in the wastewater 2+ The concentration of (3) is 80, 100, 120, 180, 200mg/L, and the equilibrium adsorption amounts corresponding to the selenium-enriched modified biochar prepared in example 1 are 48.1mg/g, 51.7mg/g, 55.4mg/g, 47.8mg/g and 59.2mg/g.
The biochar surface functional groups were determined by Boehm titration and the test results are shown in table 1.
Table 1:
due to the increase of functional groups such as carboxyl hydroxyl and the like in the prepared biochar, the functional groups and Cd are reacted with each other 2+ Complexing to improve Cd 2+ Is not limited by the removal efficiency:
-COOH+Cd 2+ +H 2 O→COOCd 2+ +H 3 O +
-OH+Cd 2+ +H 2 O→-OCd 2+ +H 3 O +
comparative example 1 is selenium-rich but does not employ CaCl 2 The hydrochloric acid solution of the straw is modified, and after high-temperature treatment, selenium in the straw can not play a role in promoting Cd 2+ The adsorption removal of the functional groups is not increased, and the complexation of the functional groups removes Cd 2+ Reduced efficiency and acid functionality with CaCO 3 Formation of calcium salt and Cd 2+ The ion exchange effect of (c) is also reduced. Making it to Cd 2+ The overall removal efficiency of (c) is poor. In comparative example 2, the selenium-rich chelated water fertilizer is not sprayed, and more metal ions do not react with hydrochloric acid, so that the hydrochloric acid is in the following conditionThe high temperature is used for severely etching the straw, so that the partial aperture of the straw is collapsed, the specific surface area is reduced, and the increase of the functional groups is inhibited to a certain extent due to the loss of sites.
Example 2
The preparation method of the selenium-rich modified biochar for adsorbing cadmium is characterized by comprising the following steps of:
(1) Pretreatment: crushing rice straw as raw material to 3-5cm, washing, air drying, crushing, sieving with 20 mesh sieve, spraying selenium-rich chelated water fertilizer on its surface, and placing in CaCl 2 Preserving heat for 1h at 100 ℃, then standing for 12h at normal temperature, and finally drying for 10h at 105 ℃;
(2) Carbonizing: carbonizing the pretreated raw material in an anoxic environment at 600 ℃ for 0.5h to obtain biochar;
(3) Cleaning: and cleaning the carbonized biochar to be neutral, drying at 105 ℃, grinding and sieving with a 100-mesh sieve to obtain the selenium-enriched modified biochar.
The main component of the selenium-rich chelated water fertilizer is sodium selenite, and the concentration is 30g/L.
The rice straw selenium-rich modified biochar prepared in the embodiment is Cd 2+ In the wastewater with the concentration of 100mg/L, cd is treated 2+ The adsorption amount was 48.9mg/g.
Example 3
The preparation method of the selenium-rich modified biochar for adsorbing cadmium comprises the following steps:
(1) Pretreatment: rice husk is used as raw material, washed, air-dried, crushed, sieved by a 60-mesh sieve, and selenium-rich chelated water fertilizer is sprayed on the surface of the rice husk, and then the rice husk is placed in CaCl 2 Preserving heat for 2 hours at 80 ℃, then standing for 16 hours at normal temperature, and finally drying for 12 hours at 100 ℃;
(2) Carbonizing: carbonizing the pretreated raw material in an anoxic environment at 300 ℃ for 1.5 hours to obtain biochar;
(3) Cleaning: and cleaning the carbonized biochar to be neutral, drying at 105 ℃, grinding and sieving with a 100-mesh sieve to obtain the selenium-enriched modified biochar.
The main component of the selenium-rich chelated water fertilizer is sodium selenite, and the concentration is 25g/L.
The selenium-rich modified biochar prepared in the embodiment is in Cd 2+ In the wastewater with the concentration of 100mg/L, cd is treated 2+ The adsorption amount was 32.6mg/g.
In the preparation process, we tried to use KOH, naOH, znCl 2 、BaCl 2 Etc. common activating agent to replace CaCl 2 The selenium-rich rice hulls are treated by hydrochloric acid solution, and the prepared rice hull biochar is specific to Cd 2+ Cd in wastewater with concentration of 100mg/L 2+ The adsorption performance of the catalyst is shown in figure 5, and the biochar prepared from the selenium-rich straw treated by various activators is specific to Cd 2+ The adsorption performance of the catalyst is not greatly fluctuated, but is obviously improved compared with selenium-rich straws without an activator; wherein in BaCl 2 After hydrochloric acid is added, the method of the invention is used for heat treatment, and the prepared selenium-rich rice hull modified biochar is specific to Cd 2+ Has a small increase in adsorption capacity, while in rice hull schemes without enriched selenium, hydrochloric acid and CaCl are added 2 After the co-treatment, there is a slight decrease in the adsorption performance.
Claims (2)
1. The preparation method of the selenium-rich modified biochar for adsorbing cadmium is characterized by comprising the following steps of:
(1) Pretreatment: crushing agricultural and forestry straws serving as raw materials to 3-5cm, washing, air-drying, crushing, sieving with a 20-60 mesh sieve, spraying selenium-rich chelated liquid fertilizer on the surface of the crushed straws, and placing the crushed straws in CaCl 2 Preserving heat for 1-2h at 80-100 ℃, then standing for 12-16h at normal temperature, and finally drying for 10-12h at 100-105 ℃;
(2) Carbonizing: carbonizing the pretreated raw material in an anoxic environment at 600-700 ℃ for 0.5h to obtain biochar;
(3) Cleaning: and cleaning the carbonized biochar to be neutral, drying at 105 ℃, grinding and sieving with a 100-mesh sieve to obtain the selenium-enriched modified biochar.
2. The method for preparing selenium-enriched modified biochar for adsorbing cadmium as set forth in claim 1, which comprisesIs characterized in that: the CaCl 2 Is prepared by adding CaCl into hydrochloric acid solution 2 Adding into hydrochloric acid solution, adjusting pH to 2-4, caCl 2 The concentration is 0.5-1.5mol/L.
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| CN202210798929.8A CN115337917B (en) | 2022-07-08 | 2022-07-08 | Preparation method of selenium-rich modified biochar for adsorbing cadmium |
| LU506396A LU506396B1 (en) | 2022-07-08 | 2023-06-06 | Method for preparing selenium-enriched modified biochar for cadmium adsorption |
| PCT/CN2023/098524 WO2024007797A1 (en) | 2022-07-08 | 2023-06-06 | Method for preparing selenium-enriched modified biochar used for adsorbing cadmium |
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