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.
Environ Sci Technol. 2017 Jun 6;51(11):6560-6569. doi: 10.1021/acs.est.6b06426. Epub 2017 May 11.
Piezo-catalysis was first used to degrade a nondye pollutant, 4-chlorophenol (4-CP). In this process, hydrothermally synthesized tetragonal BaTiO 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. 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 cyclohexanol, were determined. This is the first sample of piezo-dechlorination. Although various active species, including h, e, •H, •OH, •O, O, and HO, 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, partly from the hole oxidation of HO. These results indicated that the piezo-catalysis was an emerging and effective advanced oxidation technology for degradation and dechlorination of organic pollutants.
压电催化最初被用于降解一种非染料污染物 4-氯苯酚（4-CP）。在这个过程中，水热合成的四方相 BaTiO3 纳米/微米级颗粒被用作压电催化剂，选择低频超声辐射作为振动能引起四方相 BaTiO3 的变形。结果发现，由变形产生的压电电势不仅能成功降解 4-氯苯酚，而且能有效地同时脱氯，确定了五种脱氯中间产物，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实例。尽管在压电过程中生成了各种活性物质，包括 h、e、•H、•OH、•O、O2 和 HO，但是通过 ESR、清除剂研究和 LC-MS 证实，降解和脱氯主要归因于•OH 自由基。这些•OH 自由基主要来自于 O 的电子还原，部分来自于 HO 的空穴氧化。这些结果表明，压电催化是一种新兴的、有效的高级氧化技术，可用于降解和脱除有机污染物。
