Bi2WO6/La2WO6/TiO2的制备、表征及光催化活性
Preparation Characterization and Photocatalytic Activity of Bi2WO6/La2WO6/TiO2
康巧梅 1郑敏芬1
作者信息
- 1. 闽南科技学院 生命科学与化学学院,福建 泉州 362332
- 折叠
摘要
采用水热法将五水合硝酸铋和二水合钨酸钠结合制备出钨酸铋催化剂,然后加入硝酸镧及钛酸丁酯,利用水热法、凝胶溶胶法制备出Bi2WO6/La2WO6/TiO2 催化剂.采用X射线衍射、红外光谱、紫外-可见漫反射光谱进行催化剂表征;以罗丹明B作为污染物,在氙灯的辐射下,探究其光催化活性和最优制备条件.催化剂表征结果表明:Bi2WO6/La2WO6/TiO2催化剂的结晶度和峰强度良好,纯Bi2WO6 和Bi2WO6/La2WO6/TiO2 的红外谱图的特征峰大致相近,Bi2WO6/La2WO6/TiO2 催化剂禁带宽度为 1.36 eV,小于Bi2WO6 的禁带宽度(1.64 eV).光催化活性实验结果表明:Bi2WO6:La(NO3)3·6H2O摩尔比为 1:4.2,反应时间为 12 h,煅烧温度为 120℃,光催化剂的活性最好.当催化剂投加量为 0.1 g,罗丹明B初始浓度为50 mg/L时,光催化条件最优,光催化180 min,降解率可达到95%.
Abstract
Bismuth tungstate catalyst was prepared by combining bismuth nitrate pentahydrate with sodium tungstate dihydrate by hy-drothermal method,adding lanthanum nitrate and butyl titanate,and Bi2WO6/La2WO6/TiO2 catalyst was prepared by hydrothermal method and gel-sol method.The catalyst was characterized by X-ray diffraction,infrared spectroscopy,and UV visible diffuse reflectance spec-troscopy;Exploring the photocatalytic activity and optimal preparation conditions of rhodamine B as a pollutant under xenon lamp radia-tion.The catalyst characterization results showed that the crystallinity and peak strength of Bi2WO6/La2WO6/TiO2 catalyst were good.The characteristic peaks of the infrared spectra of pure Bi2WO6 and Bi2WO6/La2WO6/TiO2 were approximately similar.The band gap width of Bi2WO6/La2WO6/TiO2 catalyst was 1.36 eV,less than the band gap of Bi2WO6(1.64eV).The experimental results of photocatalytic activity showed that the optimal photocatalytic activity was achieved with the molar ratio of Bi2WO6:La(NO3)3·6H2O of 1:4.2,reaction time of 12 hours,and calcination temperature of 120℃.When the catalyst dosage was 0.1 g and the initial concentration of Rhodamine B was 50 mg/L,the photocatalytic conditions were optimal.The photocatalytic degradation rate could reach 95%after 180 minutes.
关键词
Bi2WO6/La2WO6/TiO2/降解率/罗丹明B/光催化活性Key words
Bi2WO6/La2WO6/TiO2/degradation rate/rhodamine B/photocatalytic activity引用本文复制引用
基金项目
闽南科技学院教改项目(MKJG-2022-008)
闽南科技学院教改项目(MKJG-2018-015)
福建省大学生创新创业训练计划项目(S201912992008)
环境科学省级一流专业建设(SJZY-2022-02)
出版年
2024
NETL
NSTL
万方数据