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Green rust doped nano-silver particle de-chlorinating agent as well as preparation method and application thereof

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

Active Publication Date: 2020-08-18
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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  • Green rust doped nano-silver particle de-chlorinating agent as well as preparation method and application thereof
  • Green rust doped nano-silver particle de-chlorinating agent as well as preparation method and application thereof
  • Green rust doped nano-silver particle de-chlorinating agent as well as preparation method and application thereof

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 de-chlorinating agent and a preparation method and application thereof. The preparation method comprises the following steps: adding ferric nitrate and ferrous nitrate into water, under a sealed condition, stirring till ferric nitrate and ferrous nitrate are completely dissolved to obtain an iron-based solution; mixing the iron-basedsolution with active carbon powder, stirring under a sealed condition to obtain iron-loaded carbon slurry; mixing silver nitrate with an ammonium hydroxide solution with a pH value of 10-12, stirringunder a sealed condition until silver nitrate is completely dissolved to obtain a silver-ammonia solution; mixing the silver-ammonia solution with the iron-loaded carbon slurry, uniformly stirring under a sealed condition to obtain mixed slurry, then adding hydrazine hydrate into the mixed slurry, and uniformly stirring under a sealed condition to obtain the green rust doped nano-silver particle de-chlorinating agent. The preparation process is simple, and related raw materials and reagents are simple and easy to obtain. Compared with a traditional green rust material, the green rust doped nano-silver particle de-chlorinating agent is higher in reaction efficiency, is suitable for a water environment with a pH of 6-12, and can remove 99% of 1,2,4-trichlorobenzene to the maximum extent.

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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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