EDTA辅助水热法合成BiYO_(3)及其高效光还原CO_(2)性能研究

EDTA-Assisted Hydrothermal Synthesis of BiYO_(3) with High-Efficient Photoreduction CO_(2) Performance

新型光催化剂的研制是光驱动下CO_(2)转化为高附加值化学品或燃料的核心问题,对实现“碳达峰·碳中和”目标具有重要意义。本文通过乙二胺四乙酸(EDTA)辅助水热法合成一系列新型Bi-Y-O光催化剂体系,发现样品的晶体结构随EDTA的添加量不同而发生变化。添加0.4 g EDTA或未添加EDTA时均可得到BiYO_(3)晶体,而添加0.8 g和1.2 g EDTA时分别制得Bi_(1.46)Y_(0.54)O_(3)和Bi_(3)YO_(6)晶体。光催化CO_(2)还原性能测试结果表明,添加0.4 g EDTA制备的BiYO_(3)具有最佳光催化CO_(2)还原活性,其CO产率为18.29μmol·g^(-1)·h^(-1),且3次循环使用后CO产率仍达17.32μmol·g^(-1)·h^(-1),明显高于其他样品。结合表征结果分析可知:EDTA的引入不仅可调控BiYO_(3)的结构形貌,而且拓宽其光响应范围、提高光生电子-空穴的分离效率,从而增强光催化还原CO_(2)性能,为新型高效B-Y-O光催化体系的研究提供基础科学数据。

The research development of novel photocatalysts is the core issue of photo-driven CO_(2)conversion into high value-added chemicals or fuels,which should be of important significance for achieving the goal of“carbon peak and carbon neutralization”.In this paper,a series of novel Bi-Y-O photocatalyst systems were synthesized by EDTA-assisted hydrothermal method,and with the change of EDTA amount,the crystal structures of as-prepared samples are variational.BiYO_(3)crystal is obtained with 0.4 g EDTA addition or without EDTA,while Bi_(1.46)Y_(0.54)O_(3)and Bi_(3)YO_(6) crystals are synthesized with 0.8 g and 1.2 g EDTA addition,respectively.The photocatalytic CO_(2)reduction tests reveal that as-prepared BiYO_(3)with 0.4 g EDTA addition exhibits the best CO_(2)photoreduction activity,and CO yield is 18.29μmol·g^(-1)·h^(-1).After three cycle tests,CO yield still reaches 17.32μmol·g^(-1)·h^(-1),higher obviously than CO yields of other samples.Finally,the characterization analysis results show that the assistance of EDTA could not only regulate the structure morphology of BiYO_(3),but also broaden the light response and enhance the separation efficiency of photogenerated electron-hole pairs,and consequently improve the photocatalytic CO_(2)reduction performance.The research in this paper provides basic scientific data for the investigation on novel highly-effective B-Y-O photocatalytic system.