SrTiO_(3)-SrWO_(4)的制备及其光催化性能研究  

Study on preparation and photocatalytic performance of SrTiO_(3)-SrWO_(4)

作　　者：王雅雯 王芳芳 耿司宇 鞠佳 陈雷 陈常东 WANG Yawen;WANG Fangfang;GENG Siyu;JU Jia;CHEN Lei;CHEN Changdong(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,China;Jiangsu SaraMike Technology New Materials Co.,Ltd.,Zhangjiagang 215600,China)

机构地区：[1]辽宁石油化工大学石油化工学院,辽宁抚顺113001 [2]江苏赛瑞迈科新材料有限公司,江苏张家港215600

出　　处：《无机盐工业》2024年第7期143-149,共7页Inorganic Chemicals Industry

基　　金：教育部“春晖计划”合作科研项目(2020703-8);国家留学基金委公派访学学者面上项目(CSC202008210025);辽宁省教育厅项目(LJKMZ20220736,JYTMS20231424)。

摘　　要：以H_(1.07)Ti_(1.73)O_(4)(HTO)为Ti源,八水合氢氧化锶[Sr(OH)_(2)·8H_(2)O]为Sr源,水合钨酸铵固体[(NH_(4))_(10)H_(2)(W_(2)O_(7))_(6)·x H_(2)O]为W源,在180℃下采用一步水热法制备不同比例Sr TiO_(3)-Sr WO_(4)复合体,通过X射线衍射仪(XRD)、扫描电镜(SEM)、紫外-可见吸收光谱仪(UV-Vis)、X射线光电子能谱仪(XPS)等测试手段研究不同复合体的结构和表面形貌,同时以氙灯为光源降解10 mg/L亚甲基蓝(MB)溶液,探究不同复合样品的光催化降解性能。实验结果表明,利用水热法成功合成不同比例Sr TiO_(3)-Sr WO_(4)复合体。复合样STW-9的降解性能最好,降解速率常数为0.055 min^(-1),Sr TiO_(3)、Sr WO_(4)的降解速率常数分别为0.017、0.01 min^(-1),这说明两者之间所形成的Z型异质结提升了载流子的分离效率。同时复合样STW-9在重复使用5次后降解率仍然可达到82%。通过捕获剂实验可得反应活性物种催化效果由高到低依次为羟基自由基(·OH)、光生空穴(h^(+))、超氧自由基(·O_(2)^(-))、光生电子(e^(-)),从而证明羟基自由基(·OH)为主要活性物种。SrTiO_(3)-SrWO_(4)复合材料能耗低,可为今后处理有机污染物提供借鉴。Using H_(1.07)Ti_(1.73)O_(4)(HTO)as Ti source,strontium hydroxide octahydrate Sr(OH)_(2)∙8H_(2)O as Sr source,and solid ammonium tungstate[(NH_(4))_(10)H_(2)(W_(2)O_(7))_(6)∙xH_(2)O]as W source,the SrTiO_(3)-SrWO_(4)complex with different proportions were prepared by onestep hydrothermal method at 180℃.X-ray diffraction(XRD),scanning electron microscopy(SEM),ultraviolet visible absorption spectroscopy(UV-Vis),X-ray photoelectron spectroscopy(XPS)and other testing methods were used to study the structure and surface morphology of different complexes.At the same time,xenon lamp was used as the light source to degrade 10 mg/L methylene blue(MB)solution,and the photocatalytic degradation performance of different composite samples was investigated.According to the experimental results,the SrTiO_(3)-SrWO_(4)complexes with different proportions were synthesized by hydrothermal method.When the composite sample was STW-9,the degradation performance was the best,and the degradation rate constant was 0.055 min^(-1).The degradation rate constants of SrTiO_(3)and SrWO_(4)were 0.017 min^(-1),0.01 min^(-1),respectively,which indicated that the Z-type heterojunction formed between them improved the carrier separation efficiency.At the same time,the degradation rate of composite STW-9 could still reach 82%after repeated use for 5 times.The catalytic effect of the reactive species was hydroxylradica(·OH)>photogenerated holes(h^(+))>superoxide radical(·O_(2)^(-))>photogenerated electron(e^(-)).The hydroxylradical(∙OH)was proved to be the main active species.SrTiO_(3)-SrWO_(4)composite material had low energy consumption and could provide reference for the treatment of organic pollutants in the future.

关 键 词：水热法 异质结 钛酸锶-钨酸锶 光催化 

分 类 号：O643.36[理学—物理化学]