Built in electric field boosted photocatalytic performance in a ferroelectric layered material SrBi_(2)Ta_(2)O_(9)with oriented facets:Charge separation and mechanism insights  

作　　者：Biru Liao Xiaomin Liao Huiyuan Xie Yuanchu Qin Yi Zhu Yang Yu Sen Hou Yuanming Zhang Xiaoyun Fan 

机构地区：[1]College of Chemistry and Materials Science,Jinan University,Guangzhou 510632,China [2]Guangdong Key Laboratory of Environmental Pollution and Health,School of Environment,Jinan University,Guangzhou 510632,China [3]Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications,Jinan University,Guangzhou 510632,China

出　　处：《Journal of Materials Science & Technology》2022年第28期222-233,共12页材料科学技术（英文版）

基　　金：financially supported by the National Key Research and Development Project of China(No.2019YFC1803404);the National Natural Science Foundation of China(No.51772325);the Natural Science Foundation of Guangdong Province(Nos.2021A1515010375,2021A1515010390);the Excellent Young Talents Discipline Construction Project of Jinan University(No.2019QNGG19);the Fundamental Research Funds for the Central Universities(No.21621401);the Open Fund of Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications(No.2020B121201005)。

摘　　要：Antibiotics have received increasing attention due to their potential adverse effects on aquatic life and human health.How to efficiently degrade them into harmless substances is a challenging subject.Ferroelectric materials with a built-in electric field can offer a strong separation ability for the photoinducedcharge pairs and are now found to be used as photocatalysts.Herein,a series of different morphologies of SrBi_(2)Ta_(2)O_(9)ferroelectric photocatalysts with high antibiotic degradation efficiency have been successfully synthesized through a molten salt method.With the addition of KCl,SrBi_(2)Ta_(2)O_(9)(SBTO 3)with exposed(001)facets shows the most excellent photocatalytic activity for decomposing tetracycline(TC)and ciprofloxacin(CIP)under visible light illumination(λ>420 nm).The rate constants of SBTO 3 for TC and CIP degradation are 1.38×10^(–1)and 4.54×10^(–2)min^(–1),which are 18 and 138 times that of the unmodified sample,respectively.The enhancement of photocatalytic performance is mainly attributed to the spontaneous polarization electric field along the[001]direction which provides a strong driven force for the separation of photoinduced charges.The KPFM results also confirm that the superior photocatalytic activity is consistent with the big large surface potential changes before and after light irradiation.The possible degradation pathways and intermediates of TC and CIP were well analyzed by DFT calculation and LC-MS.The results highlight that morphology control of the ferroelectric materials exhibits enhanced photocatalytic performance for the degradation of the antibiotic.

关 键 词：SrBi_(2)Ta_(2)O_(9) Morphology FERROELECTRIC Photocatalysis ANTIBIOTICS Built-in electric field 

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]