a cl - Synergistic activation of PMS/cnt to degrade azo dyes

A technology of azo dyes and pH value, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of secondary pollution, complicated operation, high energy consumption, etc., and achieve strong oxidation ability , Reduce salt content, wide pH range effect

Active Publication Date: 2019-11-26
SUZHOU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] For the current commonly used ultraviolet light, heat, transition metal ions, etc. to activate PMS to generate SO 4 － Some disadvantages of some disadvantages, such as high energy consumption, too complicated operation, and secondary pollution, etc., the present invention selects environmentally friendly emerging carbonaceous material CNT to activate PMS to degrade azo dyes; for high salt content (Cl - ) of azo dye wastewater, Cl - Can work together with CNT on PMS, on the one hand Cl - React with PMS to produce HOCl to oxidize and degrade azo dyes, on the other hand, CNT activates PMS to produce SO 4 － • Oxidative degradation of azo dyes, thus providing a Cl - / CNT synergistic activation of PMS to degrade azo dyes

Method used

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  • a cl <sup>-</sup> Synergistic activation of PMS/cnt to degrade azo dyes
  • a cl <sup>-</sup> Synergistic activation of PMS/cnt to degrade azo dyes
  • a cl <sup>-</sup> Synergistic activation of PMS/cnt to degrade azo dyes

Examples

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Effect test

Embodiment 1

[0027] 0.025 g CNT, 7 mL of 57 mmol L -1 PMS and 238 mL of distilled water were added to a 250 mL wide-mouth Erlenmeyer flask, then placed on a stirrer and stirred evenly, and 2 mol L -1 Sodium hydroxide solution to adjust the pH of the system to 7, then add 5 ml of 4 mmol L -1 OG. The reaction was uniformly stirred at room temperature for 45 min, and the removal of the azo dye OG by CNT-activated PMS alone was completed. In the present embodiment, the removal rate of OG reached 85% in 45 min, wherein the concentration of azo dye OG was measured using a UV-Vis spectrophotometer.

Embodiment 2

[0029] 25 mL of 500 mmol·L -1 NaCl, 0.025 g CNT and 0 mL, 1.75 mL, 3.5 mL, 7 mL and 14 mL of 57 mmol·L -1PMS was added to 250 mL wide-mouth conical flasks respectively, and then a certain amount of distilled water was added to reach a total solution of 245 mL, placed on a stirrer and stirred evenly, and 2 mol L -1 Sodium hydroxide solution was used to adjust the pH of the system to 7, and then 5 ml of 4 mmol·L -1 OG. The reaction was evenly stirred at room temperature for 45 min, and the Cl - Promote the removal of azo dye OG by CNT / PMS system. see test results figure 1 , The removal rate of OG in the present embodiment is 17%, 54%, 93%, 100%, 100% respectively.

Embodiment 3

[0031] 7 mL of 57 mmol·L -1 PMS, 25 mL of 500 mmol L -1 NaCl and 213 mL of distilled water were added to a 250 mL wide-mouth Erlenmeyer flask, then placed on a stirrer and stirred evenly, and 2 mol L -1 Sodium hydroxide solution to adjust the pH of the system to 7, then add 5 ml of 4 mmol L -1 OG. The reaction was uniformly stirred at room temperature for 45 min, and the removal of the azo dye OG by the action of NaCl and PMS alone was completed. see test results figure 2 , the removal rate of OG in 45 min reaches 82% in the present embodiment.

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Abstract

The invention provides a method for degrading azo dye by cooperatively activating PMS through Cl<-> and a CNT.The method comprises the steps that a certain amount of sodium chloride (NaCl), the carbon nano tube (CNT) and peroxymonosulfate (PMS) are added into a water body containing the azo dye (OG), the pH of a system is regulated to be and keeps within 2-10, reacting under continuous stirring is performed for 45 min at a certain revolving speed and certain temperature, and the azo dye (OG) is removed through oxidative degradation.According to the method, two mechanisms are related, that are, Cl<-> and PMS are subjected to a non-free-radical reaction to generate HOCl to oxidatively degrade the azo dye, the CNT activates PMS to generate a free radical reaction, a sulfate radical SO4<-> is generated to oxidatively degrade the azo dye, and the two mechanisms jointly act to achieve efficient degradation on the azo dye; the azo dye can be quickly and efficiently oxidatively degraded at normal temperature, the suitable pH range is wide, and the method is very suitable for treatment of industrial dye wastewater with the high salt content.

Description

technical field [0001] The invention relates to a method for treating azo dye wastewater, in particular to a method for oxidatively degrading azo dye wastewater by an advanced oxidation system, and in particular to a method for degrading azo dye by synergistically activating PMS with Cl- / CNT. Background technique [0002] Azo dyes are dyes containing one or more azo groups (—N=N—) in their molecular structure. They are commonly used dyes in industries such as textiles, papermaking, and tanning. Their production wastewater has strong toxicity, high salt content, and Mutation, carcinogenic, refractory and other characteristics, direct discharge without treatment will cause serious pollution to the environment. Common physical and chemical treatment methods for azo dye wastewater include adsorption, flocculation, photocatalysis, ozonation, etc. Among them, the adsorption and flocculation method can transfer the azo dye molecules to the adsorbent or flocculant to remove the azo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/38
CPCC02F1/66C02F1/72C02F9/00C02F2101/308C02F2305/02
Inventor 黄天寅陈家斌张黎明王忠明
Owner SUZHOU UNIV OF SCI & TECH
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