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Ferrihydrite modified biochar capable of simultaneously repairing arsenic-lead-cadmium heavy metal contaminated soil and preparation method of ferrihydrite modified biochar

A technology of polluted soil and biochar, applied in the restoration of polluted soil, chemical instruments and methods, other chemical processes, etc., can solve the problems of easy agglomeration and agglomeration, low heavy metal adsorption efficiency, etc. Slow down aging lattice rate, easy to obtain effect

Pending Publication Date: 2022-07-29
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above-mentioned problems in the prior art, the present invention provides a ferrihydrite-modified biochar and a preparation method thereof that can simultaneously restore arsenic-lead-cadmium-contaminated soil In fact, since iron oxides can efficiently adsorb arsenic, and the functional groups on biochar can efficiently bind lead and cadmium; at the same time, the biochar skeleton can effectively isolate iron oxides, prevent their agglomeration, and slow down their aging lattice rate, so as to realize the Simultaneous restoration of arsenic, lead and cadmium effectively solves the problems of easy agglomeration and low adsorption efficiency of heavy metals in the prior art

Method used

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  • Ferrihydrite modified biochar capable of simultaneously repairing arsenic-lead-cadmium heavy metal contaminated soil and preparation method of ferrihydrite modified biochar
  • Ferrihydrite modified biochar capable of simultaneously repairing arsenic-lead-cadmium heavy metal contaminated soil and preparation method of ferrihydrite modified biochar
  • Ferrihydrite modified biochar capable of simultaneously repairing arsenic-lead-cadmium heavy metal contaminated soil and preparation method of ferrihydrite modified biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A ferrihydrite-modified biochar that can simultaneously repair arsenic, lead, and cadmium heavy metal polluted soil, and a preparation method thereof comprises the following steps:

[0038] (1) Rinse the reed straw with clean water, air dry it naturally for 1 d, first cut it into 2cm pieces, and then pulverize it to 1mm finely, to obtain the pulverized straw;

[0039] (2) packing the pulverized straw obtained in step (1) into a ceramic crucible for compaction, wrapping aluminum foil and placing it in a muffle furnace and blowing nitrogen to fill the hearth, closing the furnace door, and heating up at a heating rate of 5°C / min Pyrolysis to 400℃ for 120min, natural cooling to obtain pyrolysis products;

[0040] (3) grinding and pulverizing the pyrolysis product obtained in step (2), and passing through a 100-mesh sieve to obtain biochar;

[0041] (4) Add 10 g of biochar obtained in step (3) to 500 mL of ferric nitrate solution, stir until evenly distributed, then add 330...

Embodiment 2

[0044] A ferrihydrite-modified biochar that can simultaneously repair arsenic, lead, and cadmium heavy metal polluted soil, and a preparation method thereof comprises the following steps:

[0045](1) Wash the reed stalks with clean water, dry them naturally for 2 days, first cut them into 2cm pieces, and then pulverize them to about 0.5mm finely, so that the stalks must be pulverized;

[0046] (2) packing the pulverized straw obtained in step (1) into a ceramic crucible for compaction, wrapping aluminum foil and placing it in a muffle furnace, blowing nitrogen to fill the furnace chamber, closing the furnace door, and heating up at a heating rate of 5°C / min Pyrolysis to 400℃ for 120min, natural cooling to obtain pyrolysis products;

[0047] (3) grinding and pulverizing the pyrolysis product obtained in step (2), and passing through a 100-mesh sieve to obtain biochar;

[0048] (4) Add 10 g of biochar obtained in step (3) to 500 mL of ferric nitrate solution, stir until evenly ...

Embodiment 3

[0051] A ferrihydrite-modified biochar that can simultaneously repair arsenic, lead, and cadmium heavy metal polluted soil, and a preparation method thereof comprises the following steps:

[0052] (1) Using fresh reed straw, it can be finished at 105℃ for 30min, then the temperature is lowered to 70℃ and dried to constant weight, first cut into 2cm pieces, and then pulverized to 0.5mm fine powder, to obtain pulverized straw ;

[0053] (2) packing the pulverized straw obtained in step (1) into a ceramic crucible for compaction, wrapping aluminum foil and placing it in a muffle furnace and blowing nitrogen to fill the hearth, closing the furnace door, and heating up at a heating rate of 5°C / min Pyrolysis to 400℃ for 140min, natural cooling to obtain pyrolysis products;

[0054] (3) grinding and pulverizing the pyrolysis product obtained in step (2), and passing through a 100-mesh sieve to obtain biochar;

[0055] (4) Add 10 g of biochar obtained in step (3) to 500 mL of ferric...

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Abstract

The invention provides ferrihydrite modified biochar capable of simultaneously repairing arsenic-lead-cadmium heavy metal contaminated soil and a preparation method of the ferrihydrite modified biochar. The preparation method comprises the following steps that reed straw is cleaned, naturally air-dried and smashed, and smashed straw is obtained; performing high-temperature pyrolysis on the crushed straws, and naturally cooling to obtain a pyrolysis product; the pyrolysis product is ground, smashed and sieved, and biochar is obtained; adding charcoal and a potassium hydroxide solution into the ferric nitrate solution, dropwise adding 20mL of the solution, continuously stirring to react, and stirring for 30 minutes to obtain a mixture; and centrifuging the mixture, repeatedly cleaning and centrifuging, and drying to obtain ferrihydrite modified biochar capable of simultaneously repairing arsenic-lead-cadmium heavy metal polluted soil. The invention also comprises the ferrihydrite modified biochar prepared by the method. The biochar skeleton can effectively isolate iron oxide, prevent agglomeration of the iron oxide and slow down the aging lattice rate of the iron oxide, and the problems that in the prior art, materials are prone to caking and agglomeration, and the heavy metal adsorption efficiency is low are effectively solved.

Description

technical field [0001] The invention belongs to the technical field of biochar preparation, and in particular relates to a ferrihydrite-modified biochar capable of simultaneously repairing arsenic, lead, and cadmium heavy metal polluted soil and a preparation method thereof. Background technique [0002] Heavy metal pollution around non-ferrous metal mining areas is serious, mainly including heavy metals arsenic, lead and cadmium with high toxicity and strong bio-accumulation capacity. ) enriched into the biological chain, endangering regional ecology and human health, therefore, soil heavy metal pollution remediation is extremely important. [0003] At present, soil heavy metal pollution remediation methods mainly include chemical passivation method and phytoremediation method. Among them, chemical passivation method mainly applies natural or synthetic (modified) materials and carbonaceous materials that have certain passivation ability to heavy metals into the soil. Bioma...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/30B09C1/00B09C1/08
CPCB01J20/20B01J20/06B09C1/00B09C1/08
Inventor 韦朝阳冯含笑杨芬崔岩山范传芳
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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