Z-Scheme S, B Co-Doped G-C3n4 Nanotube@Mno2 Heterojunction with Visible-Light-Responsive for Enhanced Photodegradation of Diclofenac by Peroxymonosulfate Activation

•Z-scheme CNBS@MnO2 heterojunction with core–shell structures was fabricated.•The synergistic effect of CNBS@MnO2 and PMS activation photodegrade diclofenac within 15 min.•O2●−, ●OH and h+ are the primarily reactive radicals involved in visible-light-driven photodegradation.•CNBS@MnO2 can maintain excellent recyclability and reusability after five successive runs.•The Z-scheme mechanisms with possible degradation pathways for diclofenac removal is proposed.