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A green rust mixed with nano-silver particle dechlorination agent and its preparation method and application

A technology of nano-silver particles and dechlorination agent, applied in chemical instruments and methods, water/sludge/sewage treatment, water/sewage treatment, etc., to achieve the effects of simple and easy reagents, high reaction efficiency, and simple preparation process

Active Publication Date: 2022-03-29
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few reports on the preparation methods of loading silver particles on the green rust structure

Method used

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  • A green rust mixed with nano-silver particle dechlorination agent and its preparation method and application
  • A green rust mixed with nano-silver particle dechlorination agent and its preparation method and application
  • A green rust mixed with nano-silver particle dechlorination agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 2

[0023] Embodiment 1 Ferrous ion and ferric ion molar ratio are on the influence of prepared dechlorination agent on 1,2,4-trichlorobenzene removal rate in water body

[0024] According to the molar ratio of ferrous ions and ferric ions 0.75:1, 1:1, 1.25:1, 1.5:1, 2:1, 2.5:1, 2.75:1, 3:1, 3.25:1 Ferric nitrate and ferrous nitrate are then mixed to obtain nine groups of mixed powders. According to the liquid-solid ratio of 1:1mL / mg, the nine groups of mixed powders of ferric nitrate and ferrous nitrate are added to water respectively, and stirred under sealed conditions until ferric nitrate and ferrous nitrate are mixed. The iron was completely dissolved, and nine groups of iron-based solutions were obtained. According to the liquid-solid ratio of 5:1mL / mg, nine groups of iron-based solutions were mixed with activated carbon powder, and stirred for 10 minutes under sealed conditions to obtain nine groups of iron-loaded carbon slurries. Weigh nine groups of silver nitrate accord...

Embodiment 2

[0031] Example 2 The effect of iron-based solution and activated carbon powder liquid-solid ratio on the prepared dechlorination agent on the removal rate of 1,2,4-trichlorobenzene in water

[0032] Weigh ferric nitrate and ferrous nitrate to obtain a mixed powder according to the molar ratio of ferrous ions and ferric ions of 2.5:1, add the mixed powder of ferric nitrate and ferrous nitrate to water according to the liquid-solid ratio of 1.5:1mL / mg, seal Stir under the conditions until the ferric nitrate and ferrous nitrate are completely dissolved to obtain an iron-based solution. According to the liquid-solid ratio 2.5: 1mL / mg, 3: 1mL / mg, 4: 1mL / mg, 5: 1mL / mg, 10: 1mL / mg, 15: 1mL / mg, 16: 1mL / mg, 17: 1mL / mg mg, 17.5:1mL / mg, mix the iron-based solution and activated carbon powder respectively, and stir for 20 minutes under sealed conditions to obtain nine groups of iron-loaded carbon slurries. Weigh silver nitrate according to the molar ratio of silver ions to ferrous nitrat...

Embodiment 3

[0038] Embodiment 3 Silver ion and ferrous ion molar ratio are on the influence of prepared dechlorination agent on 1,2,4-trichlorobenzene removal rate in water body

[0039] Weigh ferric nitrate and ferrous nitrate to obtain a mixed powder according to the molar ratio of ferrous ions and ferric ions of 2.5:1, add the mixed powder of ferric nitrate and ferrous nitrate to water according to the liquid-solid ratio of 2:1mL / mg, seal Stir under the conditions until the ferric nitrate and ferrous nitrate are completely dissolved to obtain an iron-based solution. Mix the iron-based solution and activated carbon powder according to the liquid-solid ratio of 15:1 mL / mg, and stir for 30 minutes under sealed conditions to obtain iron-loaded carbon slurry. According to the molar ratio of ferrous ions in silver ions and ferrous nitrate respectively 0.25:10, 0.3:10, 0.4:10, 0.5:10, 1:10, 1.5:10, 1.6:10, 1.7:10, 1.75: 10 Weigh the silver nitrate, then mix the silver nitrate into the ammoni...

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Abstract

The invention discloses a green rust-doped nano-silver particle dechlorination agent and a preparation method and application thereof, comprising the following steps: adding ferric nitrate and ferrous nitrate into water, stirring under sealing conditions until the ferric nitrate and ferrous nitrate are completely dissolved, and obtaining iron base solution; mix the iron-based solution with activated carbon powder, and stir under sealing conditions to obtain iron-loaded carbon slurry; mix silver nitrate into ammonium hydroxide solution with a pH of 10-12, and stir under sealing conditions until the silver nitrate is completely dissolved to obtain Silver ammonia solution; mix the silver ammonia solution and iron-carrying carbon slurry, stir evenly under sealed conditions to obtain a mixed slurry, then add hydrazine hydrate to the mixed slurry, and stir evenly under sealed conditions to obtain a dechlorination agent doped with nano-silver rust. The preparation process of the invention is simple, and the raw materials and reagents involved are simple and easy to obtain. Compared with the traditional green rust material, the reaction efficiency of the green rust-doped nano-silver particle dechlorination agent of the present invention is higher, and it can be applied to the water environment with pH equal to 6-12, and can achieve a maximum of 99% 1,2,4-trichlorobenzene remove.

Description

technical field [0001] The invention relates to the field of harmless disposal of chlorine-containing organic pollutants, in particular to a green rust-doped nano-silver particle dechlorination agent and a preparation method and application thereof. Background technique [0002] Chlorinated organic pollutants usually need to undergo dechlorination and hydrogenation process before they can be completely mineralized. The efficiency of dechlorination and hydrogenation of chlorinated organic compounds is determined by the reduction conversion efficiency of organic pollutants. Ferrous minerals can effectively improve the reduction conversion efficiency of reducible organic pollutants. Patina is a typical class of highly active minerals containing ferrous iron. Due to its large adsorption capacity and high reactivity, green rust has been widely used to reduce various organic and inorganic pollutants. [0003] However, during the application process, the reduction efficiency of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/58C02F1/28C02F101/34C02F101/36
CPCC02F1/705C02F1/58C02F1/283C02F1/281C02F2101/34C02F2101/36
Inventor 黄涛宋东平刘龙飞金俊勋周璐璐张树文
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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