压电增强二硫化钼/氧化锌近红外光催化降解氨氮  

Piezo-enhanced Degradation of Ammonia-Nitrogen Based on MoS_(2)/ZnO Materials Upon Near-infrared Irradiation

作　　者：潘权子 刘文晓 孟则达 罗莉[1,2] 刘守清 PAN Quanzi;LIU Wenxiao;MENG Zeda;LUO Li;LIU Shouqing(School of Chemistry and Life Science,Suzhou University of Science and Technology,Suzhou 215009,Jiangsu,China;Jiangsu Provincial Key Laboratory of Environmental Functional Materials,Suzhou 215009,Jiangsu,China)

机构地区：[1]苏州科技大学化学与生命科学学院,江苏苏州215009 [2]江苏省环境功能材料重点实验室,江苏苏州215009

出　　处：《材料导报》2023年第19期33-39,共7页Materials Reports

基　　金：国家自然科学基金(21576175);江苏省自然科学基金社会发展重点项目(BE2020662);绿色催化四川省高校开放课题资助项目(LZJ1304)。

摘　　要：将硫化钼(MoS_(2))与氧化锌(ZnO)纳米棒结合,制备了MoS_(2)/ZnO压电近红外光催化复合材料。采用X-射线粉末衍射(XRD)、扫描电镜(SEM)、透射电镜(TEM)、紫外-可见-近红外漫反射光谱(UV-VIS-INF-DRS)、固体荧光等方法对MoS_(2)/ZnO样品进行了表征。结果表明,MoS_(2)/ZnO生成了异质结。以0.1 g MoS_(2)/ZnO材料作为压电近红外光催化剂,在压电条件下降解pH=10浓度为100.0 mg/L的氨氮溶液,当在搅拌(250 r/min)条件下,用850 nm波长的近红外光照射6 h时,氨氮的降解率为90.97%;而相同条件下,无压电效应时近红外光催化降解氨氮的效率仅为65.16%,表明压电效应增强了氨氮的降解。其原因是ZnO压电构建的内建电场增强了MoS_(2)光生电子与空穴的分离效率。动力学研究表明,MoS_(2)/ZnO降解氨氮的反应遵循一级反应动力学规律,其表观反应速率常数的平均值为0.2987 h^(-1)。该研究结果对利用太阳能和水波能降解氨氮具有潜在的应用价值。A MoS_(2)/ZnO piezo-photocatalyst in response to near-infrared irradiation was prepared using hydrothermal reaction.MoS_(2)/ZnO was characte-rized with X-ray powder diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),ultraviolet-visible-near-infrared diffuse reflectance spectroscopy(UV-VIS-INF-DRS),solid fluoroscopy.The facts showed that the heterojunction was formed between MoS_(2)and ZnO.MoS_(2)/ZnO of 0.10 g was used as the photocatalyst to degrade 100.0 mg/L ammonia-nitrogen with pH 10.0 under stirring(250 r/min)and upon 850 nm near-infrared irradiation for 6 h,resulting in the degradation ratio of 90.97%,whereas the degradation ratio of ammonia-N was only 65.16%under similar conditions except for stirring.It indicated that piezo-effect enhanced the degradation of ammonia-N,which is ascribed to the enhanced separation of photo-generated electrons and holes in MoS_(2)upon near-infrared irradiation.The kinetics showed the degradation reaction of ammonia follows the first-order reaction law,the average of the apparent kinetics constant is equal to 0.2987 h^(-1).The research showed solar irradiation and water waves could be used to remove ammonia in wastewaters.

关 键 词：MoS_(2) ZNO 近红外光 压电效应 氨氮 降解 

分 类 号：O643[理学—物理化学]