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Method for degrading open-chain hydrochloric ether through tannic-acid-stable-nanoscale-zero-valent-iron-reinforced persulfate

A technology of open-chain chlorinated hydrocarbons and persulfates, applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc., can solve problems such as limiting applications and affecting the strengthening effect of persulfates, so as to reduce secondary Generation of high-grade by-products, excellent reaction effect, and fast reaction efficiency

Active Publication Date: 2019-06-28
TIANJIN UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unmodified nano-scale zero-valent iron is easy to aggregate and be oxidized, which greatly affects the strengthening effect of persulfate and limits its application.

Method used

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  • Method for degrading open-chain hydrochloric ether through tannic-acid-stable-nanoscale-zero-valent-iron-reinforced persulfate
  • Method for degrading open-chain hydrochloric ether through tannic-acid-stable-nanoscale-zero-valent-iron-reinforced persulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1 Tannic acid-stabilized zero-valent iron strengthens sodium persulfate to degrade chloroform-containing water samples

[0035] Take nano-scale zero-valent iron stabilized by sodium persulfate and tannic acid, add it to a chloroform (CF) solution with an initial concentration of 20mg / L, close the reaction environment and set the speed of the water bath shaker to 120r / min, and react for 90min. Wherein, zero-valent iron and sodium persulfate mol ratio (mol Fe / PS) is 2, and the molar percentage (mol%TA / Fe) of tannic acid and zero-valent iron is 0.33; The mol ratio of sodium persulfate and chloroform is 50 ;

[0036] Before adding persulfate, the pH value of the aqueous solution was 8.0;

[0037] After starting the reaction, use a 5mL syringe to extract 2mL of the reaction solution at a fixed time interval each time, add methanol to quench the reaction immediately after taking it out, place the 5mL centrifuge tube containing the sampling solution on a strong magnet...

Embodiment 2

[0040] Example 2 Tannic acid-stabilized zero-valent iron strengthens sodium persulfate to degrade chloroform-containing water samples

[0041] Take nano-scale zero-valent iron stabilized by sodium persulfate and tannic acid, add it to the CF solution with an initial concentration of 20 mg / L, close the reaction environment and set the speed of the water bath shaker at 120 r / min, and react for 90 min. Wherein, mol Fe / PS is 2, and mol% TA / Fe is 0.66; The mol ratio of sodium persulfate and chloroform is 50;

[0042] Before adding persulfate, the pH value of the aqueous solution was 8.0;

[0043] After starting the reaction, use a 5mL syringe to extract 2mL of the reaction solution at a fixed time interval each time, add methanol to quench the reaction immediately after taking it out, place the 5mL centrifuge tube containing the sampling solution on a strong magnet, and use magnetic force. Magnetic nano-scale zero-valent iron particles, then suck out the upper layer solution, filt...

Embodiment 3

[0046] Example 3 Tannic acid-stabilized zero-valent iron strengthens sodium persulfate to degrade chloroform-containing actual water samples

[0047] Add to the actual water sample containing CF pollution with an initial concentration of 78.55mg / L (the water sample was collected from a polluted plot site in Tianjin, the main pollutant in the water sample is chloroform, and various organic substances interfere at the same time), seal Reaction environment and set the rotation speed of the water bath shaker at 120r / min, and react for 90min. Wherein, mol Fe / PS is 3, and mol% TA / Fe is 0.66; The mol ratio of sodium persulfate and chloroform is 20;

[0048] Before adding persulfate, the pH value of the aqueous solution was 8.0;

[0049] After starting the reaction, use a 5mL syringe to extract 2mL of the reaction solution at a fixed time interval each time, add methanol to quench the reaction immediately after taking it out, place the 5mL centrifuge tube containing the sampling solu...

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Abstract

The invention provides a method for degrading open-chain hydrochloric ether through tannic-acid-stable-nanoscale-zero-valent-iron-reinforced persulfate. The method includes the following steps that 1)tannic-acid-stable nanoscale zero-valent iron is added into a water solution containing open-chain hydrochloric ether pollution; 2) the persulfate is added into the mixed water solution in the step (1), and the mixture is fully mixed. According to the method, the chloroform degradation efficiency is greatly improved, the cost is reduced, and application prospects are good.

Description

technical field [0001] The invention belongs to the field of advanced oxidation technology of organic chlorine pollutants in water, and in particular relates to a method for degrading open-chain chlorinated hydrocarbons by strengthening persulfate with nano-scale zero-valent iron stabilized by tannic acid. Background technique [0002] Organic chlorides (Chlorinated Organic Compounds, COCs) are a type of persistent organic pollutants (POPs). In the list of 12 first controlled persistent organic pollutants (POPs) listed in the Stockholm Convention, organic chlorides Among the more than 100 pollutants controlled by the United States Environmental Protection Agency (USEPA), nearly half are organic chlorides, which have very strong toxicity, carcinogenicity, resistance to biodegradation and bioaccumulation. Organic chlorides have strong mobility and exist in soil and groundwater all over the world. Open-chain chlorinated hydrocarbons are representative pollutants. Conventional t...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F101/36
Inventor 陈志国苏荣欣邱沙车明达赵旭东黄仁亮齐崴马文强张荣贾新昆宋登慧倪鑫鑫金文强徐莉莉陈泽锋王秀梅汪宽张计武
Owner TIANJIN UNIV
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