Efficient piezo-catalytic dye degradation using piezoelectric 6H-SiC under harsh conditions  

作　　者：Lin-Lin Zhou Tao Yang Kang Wang Lai-Pan Zhu En-Hui Wang Kuo-Chih Chou Hai-Long Wang Xin-Mei Hou 

机构地区：[1]Institute for Carbon Neutrality,University of Science and Technology Beijing,Beijing 100083,China [2]Institute of Steel Sustainable Technology,Liaoning Academy of Materials,Shenyang 110000,China [3]Beijing Institute of Nanoenergy and Nanosystems,Chinese Academy of Sciences,Beijing 101400,China [4]School of Materials Science Engineering,Zhengzhou University,Zhengzhou 450001,China [5]Beijing Advanced Innovation Center for Materials Genome Engineering Beijing,University of Science and Technology,Beijing 100083,China

出　　处：《Rare Metals》2024年第7期3173-3184,共12页稀有金属（英文版）

基　　金：financially supported by the National Science Fund for Distinguished Young Scholars(No.52025041);the National Natural Science Foundation of China(Nos.51902020,51974021 and 52250091);the Fundamental Research Funds for the Central Universities(No.FRF-TP-20-02C2);the State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,Guangxi University(No.2021GXYSOF12);the Interdisciplinary Research Project for Young Teachers of USTB(Fundamental Research Funds for the Central Universities)(No.FRF-IDRY-21-028)。

摘　　要：The development of novel piezoelectric catalysts against harsh conditions is indeed crucial for improving the piezo-catalytic degradation efficiency of colored organic dyes in wastewater.In this work,6H-SiC nanoparticles(NPs)are utilized to piezo-catalytic degrade rhodamine B(RhB)and methylene blue(MB)under ultrasonic vibration for the first time.The degradation efficiency of RhB and MB reaches 98.8%and 98.7%within 80 min.The piezoelectricity of 6H-SiC is comprehensively analyzed by the piezoresponse force microscope(PFM)and finite element method(FEM).The strong oxidizing active free radicals generated by the continuous piezoelectric polarized electric field of 6H-SiC,i.e.,·O_(2)^(-)and·OH,induce the decomposition reactions of colored organic dyes in solution.And the dyes are proven to degrade to harmless or less-harmful products gradually during the piezo-catalysis process by high-performance liquid chromatography tandem mass spectrometry(HPLC-MS).Moreover,RhB is also decomposed efficiently by 6HSiC NPs under acidic and alkaline conditions.These results prove the feasibility of 6H-SiC for decomposing common water pollutants under harsh conditions and provide a new perspective for water purification.

关 键 词：Piezo-catalytic degradation 6H-SIC Rhodamine B(RhB) Methylene blue(MB) Harsh conditions 

分 类 号：X703[环境科学与工程—环境工程] TQ426[化学工程]