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Sulfydryl-ferrum composite and modified clay and preparation method thereof

A composite modification and sulfhydryl compound technology, applied in the field of environmental pollution remediation, can solve problems such as insufficient detoxification efficiency of materials, and achieve the effects of easy large-scale production, low energy consumption, and low production process cost.

Active Publication Date: 2013-07-24
GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of the existing heavy metal Cr(VI) pollution treatment and disposal technology and the insufficient detoxification efficiency of materials, to provide a kind of high adsorption capacity, and at the same time have reduction activity, which can effectively adsorb and remove the polluted heavy metal Cr(VI) in the environment. ), and Cr(VI) is converted into a mercapto-iron-based composite modified clay of Cr(III) with very low toxicity and a preparation method thereof

Method used

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  • Sulfydryl-ferrum composite and modified clay and preparation method thereof
  • Sulfydryl-ferrum composite and modified clay and preparation method thereof
  • Sulfydryl-ferrum composite and modified clay and preparation method thereof

Examples

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Effect test

Embodiment 1

[0025] Example 1: Preparation of mercapto-iron-based composite modified clay using cysteamine hydrochloric acid, ferrous oxalate and bentonite as precursors.

[0026] The preparation of the mercapto-iron-based composite modified clay of this embodiment includes the following steps:

[0027] (1) Mix 0.5 mol / L cysteamine hydrochloric acid aqueous solution and 3% by mass aqueous bentonite suspension in a volume ratio of 1:10, 1:7, and 1:5;

[0028] (2) The samples with different volume ratios of step (1) were stirred and reacted in a mixer for 1.5 hours;

[0029] (3) After the reaction, the sample is centrifuged to remove the upper aqueous solution and retain the solid matter. The solid substance was washed 5 times with distilled water, then dried and ground at 60°C to obtain a powder sample;

[0030] (4) The powdered sample is mixed with water to form a suspension with a mass ratio of 2%, and the suspension is mixed with a 1.0 mol / L ferrous oxalate aqueous solution in a volume ratio of 1...

Embodiment 2

[0037] Example 2: Preparation of mercapto-iron-based composite modified clay using cystine, ferrous citrate and kaolin as precursors.

[0038] The preparation of the mercapto-iron-based composite modified clay of this embodiment includes the following steps:

[0039] (1) Mix the 2.0mol / L cystine aqueous solution with the 1% mass percent kaolin aqueous suspension in a volume ratio of 1:10;

[0040] (2) Stir the mixed sample of step (1) in a mixer for 4 hours;

[0041] (3) After the reaction, the sample is centrifuged to remove the upper aqueous solution and retain the solid matter. The solid substance is washed with distilled water, dried and ground at 40°C to obtain a powder sample;

[0042] (4) The powdered sample is mixed with water to form a suspension with a mass ratio of 2%, and the suspension is mixed with a 2.0mol / L ferrous citrate aqueous solution in a volume ratio of 1:2, 1:3, and 1:5;

[0043] (5) The mixed solution was stirred and reacted for 4 hours and then centrifuged to s...

Embodiment 3

[0048] Example 3: Preparation of mercapto-iron-based composite modified clay with mercaptopropionic acid, ferrous tartrate and montmorillonite as precursors.

[0049] The preparation of the mercapto-iron-based composite modified clay of this embodiment includes the following steps:

[0050] (1) Mix 1.0 mol / L mercaptopropionic acid aqueous solution and 1.5% by mass aqueous montmorillonite suspension in a volume ratio of 1:5;

[0051] (2) Stir the mixed sample of step (1) in a mixer for reaction for 2 hours;

[0052] (3) After the reaction, the sample is centrifuged to remove the upper aqueous solution and retain the solid matter. The solid material is washed with distilled water, dried and ground at 50°C to obtain a powder sample;

[0053] (4) The powdered sample is mixed with water to form a suspension with a mass ratio of 2%, and the suspension is mixed with a 1.5mol / L ferrous tartrate aqueous solution in a volume ratio of 1:3;

[0054] (5) The mixed solution is stirred and reacted for...

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Abstract

The invention discloses sulfydryl-ferrum composite and modified clay and a preparation method thereof. The preparation method comprises the steps of: firstly mixing a sulfhydryl compound solution in the concentration of 0.5-2.0 mol / L with a clay suspension liquid with the mass percentage of 1-3% according to the volume ratio of 1: (5-10), then stirring for 1.5-4 hours, carrying out solid-liquid separation, removing upper-layer aqueous phase components, drying solid matters at 40-60 DEG C and grinding the solid matters into powder after washing the solid matters, mixing ground powdery solid matters with water to form a suspension liquid with the mass ratio of 2%, mixing the suspension liquid with the hydroxy acid iron solution in the concentration of 1.0-2.0 mol / L, carrying out the solid-liquid separation after stirring for 1.5-4 hours, and grinding the solid matters into the powder after drying the solid matters at 40-60 DEG C, so as to obtain the sulfydryl-ferrum composite and modified clay. The clay has large loading capacity and reduction activity, can effectively adsorb the heavy metal Cr (VI) polluting the environment, and can convert the Cr (VI) into Cr(III) with low toxicity.

Description

Technical field: [0001] The invention belongs to the field of environmental pollution restoration, and particularly relates to a mercapto-iron-based composite modified clay used for hexavalent chromium removal and detoxification and a preparation method thereof. Background technique: [0002] The man-made sources of chromium pollution in the environment are mainly wastewater and waste gas discharged from industrial sectors. During the period of my country’s reform and opening up, due to the needs of rapid economic development, a large number of heavy pollution source enterprises were built, especially in the early stages of economic development, where major chromium pollution source enterprises such as metallurgy, tannery, dyes, mining and electroplating were all over the local water bodies. And soil caused serious damage. In recent years, there have been continuous chromium pollution incidents that caused serious harm, which seriously threatened the safety of soil and water bodi...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/16B01J20/30C02F1/28C02F1/62
Inventor 刘承帅王萌萌李芳柏黄宁生
Owner GUANGDONG INST OF ECO ENVIRONMENT & SOIL SCI
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