Fe掺杂Bi_(12)TiO_(20)光催化剂的制备及光催化性能  

Preparation and photocatalytic properties of Fe-doped Bi_(12)TiO_(20)photocatalyst

作　　者：李明月 李会鹏[1] 赵华[1] 蔡天凤[1] LI Mingyue;LI Huipeng;ZHAO Hua;CAI Tianfeng(School of Petrochemical Engineering,Liaoning Petrochemical University,Fushun 113001,Liaoning,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

出　　处：《精细化工》2022年第12期2514-2520,共7页Fine Chemicals

基　　金：辽宁省自然基金指导计划项目(2019-ZD-0057)。

摘　　要：以Bi(NO_(3))_(3)·5H_(2)O、钛酸四丁酯和FeCl_(3)为原料,采用水热-煅烧法制备Fe掺杂的Bi_(12)TiO_(2)0光催化剂(Fe-Bi_(12)TiO_(20)),使用XRD、UV-Vis DRS、SEM、氮气吸附-脱附、XPS对其进行了表征,并将其用于光催化降解亚甲基蓝(MB)。结果表明,当Fe的掺杂量为5%[以Bi(NO_(3))3·5H_(2)O和钛酸四丁酯的总质量为基准,下同]时,制得的催化剂(记为5%Fe-BTO)投加量为0.05 g时,其对质量浓度为10 mg/L(溶液体积50 mL)MB的降解率达到98.95%。经过Fe掺杂后,Fe-Bi_(12)TiO_(20)光催化剂形成了新的杂化能级,吸收带边界发生红移,进而提高催化剂的光催化活性,Fe以+3和+2价掺杂于Bi_(12)TiO_(20)晶体中。Fe-Bi_(12)TiO_(20)光催化剂经过重复使用5次后,对MB的降解率仍可达88%以上,具有优秀的光催化稳定性能。空穴(h+)和超氧自由基(·O_(2)^(–))是光催化降解过程中的主要活性物种。Fe-doped Bi_(12)TiO_(20)photocatalyst(Fe-Bi_(12)TiO_(20))was prepared from Bi(NO_(3))_(3)·5H_(2)O,tetrabutyl orthotitanate[(C_(4)H_(9)O)_(4)Ti]and FeCl_(3)by hydrothermal reaction-calcination process,characterized by XRD UV-Vis DRS,SEM,nitrogen adsorption-desorption and XPS,and evaluated on its photocatalytic degradation of methylene blue(MB).The results showed that,when the doping amount of Fe[based on the total mass of Bi(NO_(3))_(3)·5H_(2)O and(C4H9O)4Ti,the same below]was 5%and the prepared catalyst(denoted as 5%Fe-BTO)dosage was 0.05 g,the degradation rate of MB in a 50 m L solution with a mass concentration of 10 mg/L reached 98.95%.Fe dopant,at+3 and+2 valence,in Bi_(12)TiO_(20)crystal made the hybrid energy reach a new level,the absorption band boundary red-shifted,and photocatalytic activity improved.After recycled 5 times,Fe-Bi_(12)TiO_(20)still maintained a degradation rate of MB>88%,indicating excellent photocatalytic stability.Holes(h^(+))and superoxide radicals(·O_(2)^(–))were the main active species during photocatalytic degradation process.

关 键 词：掺杂 Bi_(12)TiO_(20) 亚甲基蓝 降解 水热法 催化技术 

分 类 号：X703[环境科学与工程—环境工程] O643.36[理学—物理化学] O644.1[理学—化学]