Arsenic-polluted soil passivator, preparation method and method for controlling arsenic-polluted soil

A passivating agent and arsenic pollution technology, which is applied in the field of remediation and treatment of polluted farmland soil, can solve the problems of complex preparation process, low efficiency, time-consuming and the like, so as to improve soil fertility, reduce the effectiveness of arsenic, and simplify the preparation process Effect

Active Publication Date: 2017-10-17
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the modified biochar is cumbersome, time-consuming and inefficient
[0007] CN105597676A discloses the preparation method of metal-based biochar and its application in heavy metal passivation. It can be seen that the prepared metal-based biochar does have obvious passivation effect on arsenic and cadmium, but it is not suitable for electrolysis conditions. mass production promotion
The passivator has a certain pa

Method used

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  • Arsenic-polluted soil passivator, preparation method and method for controlling arsenic-polluted soil
  • Arsenic-polluted soil passivator, preparation method and method for controlling arsenic-polluted soil
  • Arsenic-polluted soil passivator, preparation method and method for controlling arsenic-polluted soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Raw materials: rice straw 31.13%, FeSO 4 ·7H 2 O 64.89%, 30% H 2 o 2 3.98%

[0030] Preparation:

[0031] After the rice straw is ground, pass it through a 100-mesh sieve and set aside. Take 10g of rice straw powder and place it in 100ml of 0.75mol / L FeSO 4 ·7H 2 soaked in O solution, to FeSO 4 ·7H 2 Add 30% H to the O solution 2 o 2 , slowly added at a rate of 0.4ml / min to keep n(FeSO 4 ·7H 2 O):n(H 2 o 2 )=1:0.5.

[0032]Put the mixed solution under a magnetic stirrer, stir at 30°C for 24h, filter and dry it, put it in a muffle furnace at 300°C at a heating rate of 17°C / min for carbonization for 2h, and take it out after cooling to obtain passivation agent.

Embodiment 2

[0034] Raw materials: rice straw 40.09%, FeSO 4 ·7H 2 O 58.09%, 30% H 2 o 2 1.82%

[0035] Preparation:

[0036] After the rice straw is ground, it is passed through an 80-mesh sieve, and is set aside. Take 10g of rice straw powder and place it in 100ml of 0.36mol / L FeSO 4 ·7H 2 soaked in O solution, to FeSO 4 ·7H 2 Add 30% H to the O solution 2 o 2 , slowly added at a rate of 0.4ml / min to keep n(FeSO 4 ·7H 2 O):n(H 2 o 2 )=1:0.3.

[0037] Put the mixed solution under a magnetic stirrer, stir at 28°C for 24 hours, filter and dry it, and then carbonize it in a muffle furnace at 350°C at a heating rate of 15°C / min for 2.5 hours, and take it out after cooling to obtain passivation agent.

Embodiment 3

[0039] Raw materials: rice straw 20.00%, FeSO 4 ·7H 2 O 76.26%, 30% H 2 o 2 3.74%

[0040] Preparation:

[0041] After the rice straw is ground, pass it through a 200-mesh sieve and set aside. Take 10g of rice straw powder and place it in 100ml of 1.38mol / L FeSO 4 ·7H 2 soaked in O solution, to FeSO 4 ·7H 2 Add 30% H to the O solution 2 o 2 , slowly added at a rate of 0.4ml / min to keep n(FeSO 4 ·7H 2 O):n(H 2 o 2 )=1:0.4.

[0042] Put the mixed solution under a magnetic stirrer, stir at 25°C for 24h, filter and dry it, put it in a muffle furnace at 400°C at a heating rate of 20°C / min for carbonization for 3h, and take it out after cooling to obtain the passivation agent .

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Abstract

The invention discloses an arsenic-polluted soil passivator, a preparation method and a method for controlling arsenic-polluted soil. The passivator takes rice straw, ferrous sulfate heptahydrate and hydrogen peroxide as raw materials. The preparation method of the passivator comprises the following steps: cleaning and grinding the rice straw, soaking the rice straw into a FeSO4.7H2O solution, adding H2O2 with the concentration of 30 percent according to a ratio, uniformly mixing, filtering, drying, charring the raw materials in a muffle at 300 to 400 DEG C, so as to obtain the passivator. The passivator is wide in raw material sources, low in cost and simple in preparation method, does not cause secondary pollution, efficiently utilizes the adsorption property of the rice straw, ensures that iron base is loaded on the rice straw, ensures that the iron base is polyhydroxylated through the adding of the hydrogen peroxide, is more convenient for the fixing of arsenic, improves the use effect of the passivator, and is further beneficial to the improvement of soil fertility through biological carbon component.

Description

technical field [0001] The invention belongs to the technical field of restoration and treatment of polluted farmland soil, and in particular relates to an arsenic-contaminated soil passivator, a preparation method and a method for treating arsenic-contaminated soil. Background technique [0002] Arsenic is a toxic metalloid element that widely exists in nature. Under the influence of natural processes and human activities, arsenic can be released into soil and groundwater, enter the human body through the food chain, and cause harm to human health. The extensive use of arsenic-containing chemicals such as insecticides, herbicides and other pesticides in the agricultural production process has caused many farmland soils to be polluted by arsenic (Wu Chuan, Mo Jingyu, Xue Shengguo, etc. Journal of Ecology, 2014, 34(4): 807 -813). There are serious pollution problems of arsenic in soil and groundwater in many countries, and arsenic pollution incidents and arsenic poisoning ha...

Claims

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Application Information

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IPC IPC(8): C09K17/04B09C1/08
CPCB09C1/08B09C2101/00C09K17/04
Inventor 吴川薛生国崔梦倩邹奇安文慧黄桂鸿
Owner CENT SOUTH UNIV
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