Title: Two new Zn-based coordination polymers constructed from light responsive organic ligand: efficient cleanup of Cr(VI) and organic pollutants

Authors: Si-Qi Ma, Bao-Yi Yu, Xiao-Hong Yi, Chong-Chen Wang

Corresponding Author: Chong-Chen Wang

Abstract: Two new Zn-based coordination polymers constructed from light responsive organic ligand: efficient cleanup of Cr(VI) and organic pollutants --Manuscript Draft-- Manuscript Number: POLYH-D-20-00296R2 Article Type: Regular Paper Keywords: Coordination polymer; photocatalysis; Cr(VI) reduction; Organic dyes; cleanup Corresponding Author: Chong-Chen Wang Beijing University of Civil Engineering and Architecture Beijing, CHINA First Author: Si-Qi Ma Order of Authors: Si-Qi Ma Bao-Yi Yu Xiao-Hong Yi Chong-Chen Wang Abstract: Two new coordination polymers, ZnL(2,2'-bpy)·(H 2 O) ( BUC-85 ) and  ZnL(bpa)·(H 2 O) ( BUC-86 ) (H 2 L = cis -1,3-dibenzyl-2-imidazolidone-4,5-dicarboxylic acid, 2,2’-bpy = 2,2'-bipyridine, bpa =  1,2-bis(4-pyridyl)ethane), were synthesized under solvothermal conditions. Both BUC-85  and BUC-86  were used to test the photocatalytic Cr(VI) reduction and organic pollutants degradation abilities under UV light. The results revealed that both BUC-85  and BUC-86  displayed superior catalytic Cr(VI) reduction performances with reduction efficiencies up to 99% within 40 min under UV light irradiation. As well, BUC-85  and BUC-86  could photocatalytically decompose organic dyes, in which the oxidative degradation efficiencies toward methylene blue were 100% ( BUC-85 ) and 99% ( BUC-86 ) under the irradiation of UV light for 60 min. Finally, a possible photocatalytic reaction mechanism is proposed and verified.