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Composition for reducing arsenic toxicity and application thereof

A composition and technology of arsenic toxicity, applied in the field of soil and water pollution treatment, can solve the problems of oxidant secondary pollution, metal dissolution toxicity, etc., and achieve the effect of reducing toxicity

Inactive Publication Date: 2020-06-09
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved: the present invention aims at the problems of catalyst metal dissolution toxicity and oxidant secondary pollution in the existing advanced oxidation technology, and provides a composition for reducing arsenic toxicity and its application, using natural nontronite coupling mercaptan to generate hydroxyl free Base reduces arsenic toxicity

Method used

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  • Composition for reducing arsenic toxicity and application thereof
  • Composition for reducing arsenic toxicity and application thereof
  • Composition for reducing arsenic toxicity and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1, two kinds of nontronite clays (NAu-1 and NAu-2) and one kind of montmorillonite clay (SAz-2) were pulverized to collect 0.5-2µm particles for later use;

[0028] Step 2, add 0.1g of the clay particles in the above step 1, 1mL 100mmol / L cysteine, 1mL 200mmol / L benzoic acid solution with pH=5.7 into the glass bottle, add deionized water to dilute to 20mL, The sample was stirred and reacted with a magnetic stirrer in the air;

[0029] Step 3: After 0, 4, 10, 24, 48, and 96 hours, take out 0.9 mL of the sample and add it to 0.1 mL of methanol, filter the solution with a 0.22 µm water filter, and store the filtrate in a 4°C refrigerator for later use;

[0030] Step 4, detecting the content of p-hydroxybenzoic acid in the filtrate of step 3 is used to indicate the concentration of hydroxyl radicals.

[0031] Such as figure 1 The experimental results show that compared with montmorillonite, nontronite can generate a large number of hydroxyl radicals in a short time, ...

Embodiment 2

[0033] Step 1, the nontronite clay is pulverized to collect particles of 0.5-2 µm, and set aside;

[0034] Step 2, add 0.1g or 0.08g or 0.06g or 0.04g or 0.02g or 0g of the clay particles in the above step 1, and 2mL 100mmol / L cysteine, 1 mL 200mmol / L pH = For the benzoic acid solution in 5.7, add deionized water to make the volume to 20mL, and stir the sample in the air with a magnetic stirrer;

[0035] Step 3, after 96 hours, take out 0.9mL sample and add it to 0.1mL methanol, filter the solution with a 0.22 µm water filter membrane, and store the filtrate in a refrigerator at 4°C for later use;

[0036] Step 4, detecting the content of p-hydroxybenzoic acid in the filtrate of step 3 is used to indicate the concentration of hydroxyl radicals.

[0037] Such as figure 2 The experimental results show that when the concentration of nontronite is greater than 3g / L, the accumulation of hydroxyl radicals reaches the peak value. Therefore, in order to achieve the best effect when...

Embodiment 3

[0039] Step 1, the nontronite clay is pulverized to collect particles of 0.5-2 µm, and set aside;

[0040] Step 2, add 0.1g of clay particles from step 1 above, 1mL 100mmol / L or 80mmol / L or 60mmol / L or 40mmol / L or 20mmol / L or 0mmol / L cysteine, and 1 mL 200mmol / L of benzoic acid solution with pH=5.7, add deionized water to make the volume to 20mL, and stir the sample in the air with a magnetic stirrer;

[0041] Step 3, after 96 hours, take out 0.9mL sample and add it to 0.1mL methanol, filter the solution with a 0.22 µm water filter membrane, and store the filtrate in a refrigerator at 4°C for later use;

[0042] Step 4, detecting the content of p-hydroxybenzoic acid in the filtrate of step 3 is used to indicate the concentration of hydroxyl radicals.

[0043] Such as image 3 The experimental results show that the higher the concentration of cysteine, the more accumulation of hydroxyl radicals, so the optimal concentration of cysteine ​​is 5mmol / L.

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Abstract

The invention relates to a composition for reducing arsenic toxicity and an application thereof, the composition is composed of chlorophyllite and mercaptan, and the ratio of chlorophyllite to mercaptan is 5g / L: 5mmol / L. According to the method, natural chlorophyllite is coupled with mercaptan to generate hydroxyl radicals, so that the toxicity of arsenic is reduced, the catalyst is environmentally friendly, secondary pollution is avoided, and the product particularly has a wide application prospect in treatment of arsenic in soil and wastewater under a dark condition.

Description

technical field [0001] The invention belongs to the field of soil and water body pollution treatment, and in particular relates to a composition for reducing arsenic toxicity and application thereof. Background technique [0002] The human factors of arsenic pollution in water mainly come from the discharge of industrial "three wastes" and the production activities of agriculture and animal husbandry. Arsenic in the inorganic state mainly exists in two forms, As(III) and As(V). In groundwater, As(III) is dominant, and the survey shows that the content of As(III) in groundwater in the suburbs of Beijing accounts for 80% of the total arsenic. As(III) is dozens of times more toxic than As(V), and has stronger solubility and migration ability. Due to its weak mobility, As(V) is easier to remove from water by adsorption and coagulation. Therefore, the conversion of highly toxic As(III) to As(V) by biological and chemical methods can not only reduce the toxicity of arsenic, b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C09K17/40B09C1/08B09C1/00C02F101/10
CPCC02F1/72B09C1/08B09C1/002C09K17/40B09C2101/00C02F2101/103C02F2305/023
Inventor 高娟孙昭玥
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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