一步法快速合成Fe掺杂混晶TiO_(2)及其增强太阳光催化活性研究  

One-step rapid synthesis of Fe-doped mixed crystal TiO_(2) and its enhanced photocatalytic activity

作　　者：李崇裔 谢桂容[1] 谈瑛 张翔[1] 唐淑贞[1] 刘宏[1] Li Chongyi;Xie Guirong;Tan Ying;Zhang Xiang;Tang Shuzhen;Liu Hong(School of Chemical Engineering,Hunan Chemical Vocational Technology College,Zhuzhou 412000)

机构地区：[1]湖南化工职业技术学院化学工程学院,株洲412000

出　　处：《化工新型材料》2023年第5期218-223,共6页New Chemical Materials

基　　金：湖南省自然科学基金项目(2019JJ70071)。

摘　　要：基于半导体能带理论,设计并制备了不同浓度Fe掺杂的球形混晶TiO_(2)基光催化剂,利用X射线衍射、紫外-可见吸收光谱、X射线光电子能谱、扫描电镜、透射电镜、能谱分析、荧光光谱等测试方法对样品进行系统性表征,并以甲基橙(MO)溶液为目标污染物模拟印染废水,研究样品在太阳辐射下的光催化性能。结果表明:TiO_(2)具有锐钛矿/金红石/板钛矿三相混晶结构,Fe掺杂能明显促进锐钛矿向金红石转变,显著提高太阳光利用率和有效抑制光生载流子复合;2%Fe^(3+)/TiO_(2)的光催化活性表现最佳,其对MO的催化降解效率高达94.6%(120min),反应速率常数为23.22×10^(-3)min^(-1);活性组分猝灭实验证实h+氧化是降解MO的核心机制,·OH和·O_(2)^(-)则发挥次要作用。A series of spherical mixed crystal TiO_(2)-based photocatalysts with different Fe-doping concentration were designed and fabricated based on the band theory of semiconductor.The samples were systematically characterized by various methods including XRD,UV-Vis,XPS,SEM,TEM,EDS and PL.The photocatalytic activities of the samples under solar radiation were also studied by using methyl orange(MO)solution as targeted contaminant to simulate dyeing wastewater.The results indicated TiO_(2)had a three-phase mixed crystalline structure of anatase/rutile/brookite,and Fe doping contributed a lot to the phase transition from anatase to rutile,significant enhancement of the utilization of sunlight and the inhibition of the recombination of photo-induced electron-hole pairs.Moreover,2%Fe^(3+)/TiO_(2)showed the best photocatalytic activity with a catalytic degradation efficiency of 94.6%(120 min)for MO and a reaction rate constant of 23.22×10^(-3)min^(-1).Furthermore,the analysis by scavenging experiments of reactive species confirmed that h~+oxidation was the core mechanism for MO degradation,while·OH and·O_(2)^(-)played a relatively minor role.

关 键 词：Fe掺杂二氧化钛 混晶 光催化活性 太阳辐射 

分 类 号：TB333[一般工业技术—材料科学与工程]