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Preparation method for composite zero-valent iron dechlorination agent from flos sophorae and application of composite zero-valent iron dechlorination agent

A zero-valent iron and Sophora japonica technology is applied in the field of environmental remediation, which can solve problems such as affecting the use effect, easy failure in storage and transportation, and reducing reactivity, and achieves the effects of uniform load, good dispersion, and increased specific surface area.

Inactive Publication Date: 2019-12-10
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are still some problems in the practical application of nano-zero-valent iron. It is easy to aggregate under the action of van der Waals force and magnetic force to reduce the reactivity, and it is easy to oxidize, and it is easy to fail during storage and transportation, which affects the use effect.

Method used

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  • Preparation method for composite zero-valent iron dechlorination agent from flos sophorae and application of composite zero-valent iron dechlorination agent
  • Preparation method for composite zero-valent iron dechlorination agent from flos sophorae and application of composite zero-valent iron dechlorination agent
  • Preparation method for composite zero-valent iron dechlorination agent from flos sophorae and application of composite zero-valent iron dechlorination agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Preparation of composite zero-valent iron dechlorination agent

[0029] Weigh 0.5g of 200 mesh dry silkworm excrement biochar and add it to 30mL of 13g / L microcrystalline cellulose solution, then add 0.23g of citric acid, ultrasonically disperse for 30min, and shake at 25°C for 4h. After the shaking is completed, place it in a 50mL high-pressure sealed reaction kettle, react at a constant temperature of 220°C for 12h, cool naturally to room temperature, wash and centrifuge the material with absolute ethanol, and dry it in an oven at 75°C for 12h before use; oxidize a small amount of hydrogen Dissolve calcium and borax into 150ml of acetone and deionized water mixture, stir evenly, then add 10g of Sophora japonica rice into it, heat, boil for 20-30min, filter the residue while it is hot, and concentrate the remaining liquid by rotary steaming at 55°C When the volume is reduced to 1 / 3, the Sophora japonica rice dissolution solution is obtained; weigh 4g FeSO...

Embodiment 2

[0030] Example 2: Degradation experiment of chlorinated organic matter (1,2-dichlorobenzene) in aqueous solution

[0031] Weigh 0.5g of the composite zero-valent iron dechlorination agent prepared in the above-mentioned implementation case 1, add it to 40mL of 2,4-dichlorophenol simulated wastewater with an initial concentration of 10mg / L, seal it and put it in a constant temperature (25°C) The reductive dechlorination reaction was carried out in a water-bath oscillator, and samples were regularly sampled and analyzed after 6, 12, 24, 48, and 72 hours of reaction respectively. The experiment was set up as a blank test and a parallel test. The calculated degradation rate-time curve is shown in figure 1 .

Embodiment 3

[0032] Example 3: Degradation experiment of chlorinated organic matter (o-chlorophenol) in aqueous solution

[0033] Weigh 1 g of the composite zero-valent iron dechlorination agent prepared in the above-mentioned implementation case 1, add it to 40 mL of o-chlorophenol simulated wastewater with an initial concentration of 50 mg / L, seal it and place it in a constant temperature (25°C) water bath shaker for For the reductive dechlorination reaction, samples were taken and analyzed at regular intervals after 6, 12, 24, 48, and 72 hours of reaction, respectively, and blank tests and parallel tests were set up in the experiments. The calculated degradation rate-time curve is shown in figure 2 .

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Abstract

The invention relates to the field of environmental restoration, and in particular, relates to a preparation method for a composite zero-valent iron dechlorination agent from flos sophorae and an application of the composite zero-valent iron dechlorination agent, wherein the composite zero-valent iron dechlorination agent can degrade chlorine-containing organic matters. The preparation method comprises the steps of pretreatment of biochar, preparation of a flos sophorae dissolution liquid, preparation and loading of zero-valent iron and the like. The composite zero-valent iron dechlorination agent has the advantages of large loading capacity, good dispersity, uniform loading, large specific surface area and the like, has excellent reaction activity in reduction and dechlorination of chlorine-containing organic pollutants, has good degradation effect, and cannot cause secondary pollution to the environment in the repair process.

Description

technical field [0001] The invention relates to the field of environmental restoration, in particular to a method and application of a compound zero-valent iron dechlorination agent prepared from Sophora japonica that can degrade chlorine-containing organic substances. Background technique [0002] Chlorine-containing organic compounds include chlorinated hydrocarbons, chlorinated aromatic hydrocarbons, and organochlorine pesticides. As an important class of modern chemical production raw materials and intermediates, they are widely used due to their large-scale production and high persistence in the environment. in groundwater and soil. At the same time, chlorinated organic pollutants can pose serious threats to human life and the environment, such as carcinogenicity and cytotoxicity to the central nervous system, immune system, and endocrine system. Chlorine-containing organic compounds have the characteristics of high residue and refractory degradation, and the direct us...

Claims

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Application Information

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IPC IPC(8): C02F1/70C09K17/40B09C1/08C02F101/36
CPCB09C1/08C02F1/705C02F2101/36C09K17/40
Inventor 林爱军谭笑杨文杰刘家豪王金航
Owner BEIJING UNIV OF CHEM TECH
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