Construction of a Porous Pyrite Cinder-Supported Mn-Doped Bifeo 3 Composite Photocatalyst: Confined-Space Strategy, Structure, And Visible-Light Catalytic Degradation Toward Ciprofloxacin

作     者：Liu, Lihua Pan, Weimin Liu, Yuzhi Xu, Shijie Zhou, Jinxun Tang, Anping Xue, Jianrong 

作者机构：School of Chemistry and Chemical Engineering Hunan University of Science and Technology Xiangtan411201 China Key Laboratory of Theoretical Organic Chemistry and Function Molecule Ministry of Education Xiangtan411201 China Hunan Province Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers Xiangtan411201 China Hunan Province College Key Laboratory of Molecular Design and Green Chemistry Xiangtan411201 China 

出 版 物：《SSRN》 

年 卷 期：2023年

核心收录：

主　　题：Reusability 

摘      要：A series of novel confined visible-light catalysts, namely, Mn-doped BiFeO3 (MBFO) composite photocatalyst supported on porous residue pyrite cinder (PR-PyC) after partial Fe extraction (PR-PyC/MBFO-φ, φ refers to the doped amount of Mn), was successfully constructed via confined-space strategy using the Fe-containing solution extracted from PyC as Fe source for BiFeO3 (BFO) and the PR-PyC as the template and structure regulator for MBFO generation. The obtained product, PR-PyC/MBFO-5%, consists of relatively uniform nanoparticles anchored in the channels of PR-PyC matrix and interparticle interstices and has a specific surface area of 14.1835 m2/g, an average pore size of 37.7610 nm, and a pore volume 0.1339 cm3/g. It has a type-Ⅱ heterojunction with a band gap energy (Eg) of 1.95 eV and exhibits high visible-light catalytic degradation activity toward ciprofloxacin (CIP) and excellent recyclability. The CIP degradation rate of PR-PyC/MBFO-5% reached 96.41% with an apparent reaction rate constant kapp of 0.0265 min−1 under visible-light irradiation for 120 min, and the corresponding mineralization rate reached 77.42%. The active species produced during photocatalysis were h+ and •OH, in which h+ plays a major role. The doping of 5% Mn can effectively regulate the energy band structure and heterojunction type and the use of an appropriate amount of PR-PyC can effectively guide and regulate the structure and morphology of the as-prepared catalyst. This work provides an efficient confined-space strategy for the construction of novel high-efficiency photocatalysts for antibiotic degradation and opens up a new avenue for the high-value resource utilization of PyC. © 2023, The Authors. All rights reserved.