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, w

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

Example Embodiment

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

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

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

[0037] After starting the reaction, use a 5 mL syringe to draw 2 mL of the reaction solution at a fixed time interval, and immediately add methanol to quench the reaction after taking it out. Place the 5 mL centrifuge tube containing the sampling solution on a strong magnet, and separate it with magnetic f...

Example Embodiment

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

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

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

[0043] After starting the reaction, use a 5 mL syringe to draw 2 mL of the reaction solution at a fixed time interval, and immediately add methanol to quench the reaction after taking it out. Place the 5 mL centrifuge tube containing the sampling solution on a strong magnet, and separate it with magnetic force. Magnetic nano-scale zero-valent iron particles, and then suck out the upper layer solution, filter with 0.22 micron in...

Example Embodiment

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

[0047] Add to the actual water sample containing CF pollution with an initial concentration of 78.55mg / L (the water sample was taken from the site of a polluted plot in Tianjin, the main pollutant in the water sample is chloroform, and a variety of organic matter interferes). In the reaction environment, the rotation speed of the water bath shaker was set to 120r / min, and the reaction time was 90min. Among them, mol Fe / PS is 3, mol% TA / Fe is 0.66; the molar ratio of sodium persulfate to chloroform is 20;

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

[0049] After starting the reaction, use a 5 mL syringe to draw 2 mL of the reaction solution at a fixed time interval, and immediately add methanol to quench the reaction after taking it out. Place the 5 mL centrifuge tube containing the sampling solution on a s...

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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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