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Method of photocoupling to promote decomposition and purification of perfluorochemicals

A perfluorinated compound, photoelectric coupling technology, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc. Degradation efficiency and power generation capacity improvement, the effect of enhancing power generation capacity and level

Active Publication Date: 2019-05-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially its representative compound perfluorooctanoic acid, if not handled properly, will seriously pollute the environment and endanger human beings and the global ecosystem
Different purification methods (physical removal technology, chemical removal technology and biological removal technology) have their own limitations while being able to play a role in purification

Method used

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  • Method of photocoupling to promote decomposition and purification of perfluorochemicals
  • Method of photocoupling to promote decomposition and purification of perfluorochemicals
  • Method of photocoupling to promote decomposition and purification of perfluorochemicals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: Treatment of perfluorooctanoic acid by photoelectric coupling system

[0020] The catalytic electrode was placed in a long tubular quartz reactor, connected above the catalytic electrode with alligator clips, connected with wires to form a circuit, and connected with a 1000 ohm resistor. Aeration is provided at the bottom of the reactor. The visible light source is a 50W halogen tungsten lamp. Before the start of the reaction, 0.01 mol / L sodium bisulfite was added and dissolved in the perfluorooctanoic acid solution with a concentration of 10 mg / L. After the reaction started, sampling was carried out every 30 min, and the concentration was measured by high performance liquid chromatography-mass spectrometry. The reaction was carried out for a total of 2h, and the removal rate of PFOA was calculated.

[0021] figure 1 In this study, the different degradation effects and electricity generation performances of four systems of photocatalysis (PC), electrocatal...

Embodiment 2

[0023] Example 2: Treatment of perfluorooctanoic acid with and without aeration systems

[0024] The catalytic electrode was placed in a long tubular quartz reactor, connected above the catalytic electrode with alligator clips, connected with wires to form a circuit, and connected with a 1000 ohm resistor. Aeration is provided at the bottom of the reactor. The visible light source is a 50W halogen tungsten lamp. Before the start of the reaction, 0.01 mol / L sodium bisulfite was added and dissolved in the perfluorooctanoic acid solution with a concentration of 10 mg / L. After the reaction started, sampling was carried out every 30 min, and the concentration was measured by high performance liquid chromatography-mass spectrometry. The reaction was carried out for a total of 2h, and the removal rate of PFOA was calculated.

[0025] image 3In , the different degradation effects and power generation performance of the system with aeration (aeration) and no aeration (no aeration) ...

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Abstract

The invention provides a method of photocoupling to promote decomposition and purification of perfluorochemicals, and belongs to the technical field of treatment of perfluorochemicals and energy-saving recycling. carbon nanosheet / g-C3N4 / BiWO6 is prepared, a catalysis electrode is prepared by fixedly smearing silica sol to a stainless steel net, the catalysis electrode is connected with a circuit to form a photocatalytic and electro-catalysis coupling system, degradation and purification of perfluoro caprylic acid are achieved under the effects of photocatalysis, electro-catalysis, dark adsorption and photoelectrocatalysis, effect influence of perfluoro caprylic acid is degraded under different pH conditions, and effect influence of perfluoro caprylic acid is degraded under the conditions of existence of aeration and no aeration in the system. The edegradation performance of photoelectro catalysis is remarkably improved through the synergistic effect of a photocatalysis technique and anelectro-catalysis technique.

Description

technical field [0001] The invention belongs to the technical field of perfluorinated compound treatment and energy saving and resource utilization, and relates to carbon nanosheets / g-C 3 N 4 / BiWO 6 The preparation of nanocomposite catalyst and its photoelectric catalytic synergy can decompose and purify pollutants and generate electricity, and improve the degradation efficiency and electricity generation capacity of perfluorinated compounds. Background technique [0002] Perfluorinated compounds are widely used in industrial production and domestic consumption. It can be detected in different environmental media worldwide due to direct or indirect emissions during manufacture, use and disposal. Perfluorinated compounds are environmental pollutants with strong biological toxicity, mainly manifested as neurobehavioral toxicity, organ toxicity, reproductive toxicity, genotoxicity and carcinogenicity. In particular, its representative compound perfluorooctanoic acid, if no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F1/461C02F101/36
Inventor 柳丽芬石朋张旭
Owner DALIAN UNIV OF TECH