摘要
在水热法合成立方相Cd InS的基础上,通过等离子体技术将石墨烯与Cd InS复合,构建具有2D-2D复合结构的石墨烯/CdIn_(2)S_(4)复合光催化剂。采用XRD、SEM、TEM、BET等技术对结构进行了分析,并详细考察了石墨烯/CdIn_(2)S_(4)在可见光下降解RhB和还原Cr(IV)的性能。结果表明:通过等离子体技术合成的石墨烯/Cd InS,不仅可以增大比表面积,还能有效抑制光生载流子的复合,石墨烯的负载显著增强了CdIn_(2)S_(4)的光催化性能。其中,10%-石墨烯/CdIn_(2)S_(4)表现出最佳的光催化性能,可将初始浓度为20μmol·L^(-1)的RhB和初始质量浓度为10 mg·L^(-1)的Cr(IV)分别降解97%和还原87%,表观一级反应速率常数分别为0.0362 min和0.0214 min,分别是Cd InS的4.6和4.9倍。降低溶液的pH值,可以进一步提高Cr(IV)的光催化还原效率。
Based on the hydrothermal synthesis of cubic CdIn_(2)S_(4),graphene/CdIn_(2)S_(4)composite photocatalysts with2D-2D heterostructure were fabricated through plasma technology.The structure of graphene/CdIn_(2)S_(4)was analyzed by XRD,SEM,TEM and BET,and the photocatalytic performance for RhB degradation and Cr(IV)reduction under visible light irradiation was investigated.The results indicated that the introduction of graphene could not only increase the specific surface area,but also improve the separation of the photogenerated charges.As a result,the loading of graphene in graphene/CdIn_(2)S_(4)significantly enhanced the photocatalytic activity of CdIn_(2)S_(4).Among all the composites,10%-graphene/CdIn_(2)S_(4)exhibited the optimum photocatalytic performance.The degradation rate of RhB and the reduction rate of Cr(IV)was 97%and 87%,respectively.The corresponding apparent first-order reaction rate constant was calculated to be 0.0362 minand 0.0214 min,which was 4.6 and 4.9 times higher than that CdIn_(2)S_(4).Furthermore,reducing the pH value of the Cr(IV)solution could further improve the photocatalytic reduction efficiency of Cr(IV).
作者
阮英
RUAN Ying(Wuhan Qingshan District Water Engincering Construction Quality and Safety Supervision and Management Station,Wuhan Hubei 430080,China)
出处
《当代化工》
CAS
2022年第7期1633-1638,共6页
Contemporary Chemical Industry
基金
山东省重大科技创新工程项目(项目编号:2021CXGC010705)。
