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首页> 外文期刊>Environmental Science & Technology >Performance and Mechanism of Piezo-Catalytic Degradation of 4-Chlorophenol: Finding of Effective Piezo-Dechlorination
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Performance and Mechanism of Piezo-Catalytic Degradation of 4-Chlorophenol: Finding of Effective Piezo-Dechlorination

机译：4-氯酚的压电催化降解性能及机理：有效压电脱氯的发现

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摘要

Piezo-catalysis was first used to degrade a nondye pollutant, 4- chlorophenol (4-CP). In this process, hydrothermally synthesized tetragonal BaTiO_3 nano/micrometer-sized particles were used as the piezo-catalyst, and the ultrasonic irradiation with low frequency was selected as the vibration energy to cause the deformation of tetragonal BaTiO_3. It was found that the piezoelectric potential from the deformation could not only successfully degrade 4-chlorophenol but also effectively dechlorinate it at the same time, and five kinds of dechlorinated intermediates, hydroquinone, benzoquinone, phenol, cyclohexanone, and cyclo- hexanol, were determined. This is the first sample of piezo-dechlorination. Although various active species, including h~+, e~-, ·H, ·OH, ·O_2~-,~1O_2, and H_2O_2 were generated in the piezoelectric process, it was confirmed by ESR, scavenger studies, and LC-MS that the degradation and dechlorination were mainly attributed to ·OH radicals. These ·OH radicals were chiefly derived from the electron reduction of O_2, partly from the hole oxidation of H_2O. These results indicated that the piezo-catalysis was an emerging and effective advanced oxidation technology for degradation and dechlorination of organic pollutants.
机译：压电催化首先用于降解非染料污染物4-氯酚（4-CP）。在此过程中，将水热合成的四方BaTiO_3纳米/微米尺寸的颗粒用作压电催化剂，并选择低频超声辐照作为振动能，以引起四方BaTiO_3变形。发现变形产生的压电势不仅可以成功降解4-氯苯酚，而且还可以同时对其有效地脱氯，并确定了五种脱氯中间体：对苯二酚，苯醌，苯酚，环己酮和环己醇。 。这是压电脱氯的第一个样品。尽管在压电过程中生成了各种活性物质，包括h〜+，e〜-，·H，·OH，·O_2〜-，〜1O_2和H_2O_2，但ESR，清除剂研究和LC-MS证实了这一点。降解和脱氯主要归因于·OH自由基。这些·OH自由基主要源自O_2的电子还原，部分源自H_2O的空穴氧化。这些结果表明，压电催化是一种新兴的有效的先进氧化技术，用于有机污染物的降解和脱氯。

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  • 来源
    《Environmental Science & Technology》 |2017年第11期|6560-6569|共10页
  • 作者

    Shenyu Lan; Jinxi Feng; Ya Xiong; Shuanghong Tian; Shengwei Liu; Lingjun Kong;

  • 作者单位

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, P. R.China;

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, P. R.China;

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, P. R.China;

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China,Department of Chemistry, University of California-Riverside, Riverside, California 92521, United States;

    School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China,Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, Guangzhou 510275, P. R.China;

    School of Environmental Science and Engineering, Guangzhou University, Guangzhou 510006, P. R. China;

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