Pd sub-nanolayer on Au core for enhanced catalytic hydrogenation reduction of oxyanions pollutants: Synergistic effect of Pd and Au

Minghui Li; Hang Liu; Chang Liu; Yan Ding; Caixia Fang; Rui Wan; Hongjie Zhu; Yaning Yang

doi:10.1016/j.envpol.2023.122067

Pd sub-nanolayer on Au core for enhanced catalytic hydrogenation reduction of oxyanions pollutants: Synergistic effect of Pd and Au

Environ Pollut. 2023 Sep 15:333:122067. doi: 10.1016/j.envpol.2023.122067. Epub 2023 Jun 21.

Authors

Minghui Li¹, Hang Liu², Chang Liu¹, Yan Ding¹, Caixia Fang¹, Rui Wan¹, Hongjie Zhu³, Yaning Yang⁴

Affiliations

¹ College of Ecology and Environment, Anhui Normal University, 189 South of Jiuhua Road, Wuhu, Anhui, 241002, PR China.
² College of Ecology and Environment, Anhui Normal University, 189 South of Jiuhua Road, Wuhu, Anhui, 241002, PR China; Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, Anhui Normal University, 189 South of Jiuhua Road, Wuhu, Anhui, 241002, PR China.
³ Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology, School of Chemistry and Chemical Engineering, Liaocheng University, Liaocheng, 252059, PR China.
⁴ College of Ecology and Environment, Anhui Normal University, 189 South of Jiuhua Road, Wuhu, Anhui, 241002, PR China; Department of Environmental Science and Engineering, University of Science and Technology of China, Hefei, 230026, PR China; Anhui Huaqi Environmental Protection Technology Co. Ltd., Ma' Anshan, Anhui, 243000, PR China. Electronic address: yyn@ahnu.edu.cn.

PMID: 37352958
DOI: 10.1016/j.envpol.2023.122067

Abstract

Oxyanion pollutants in industrial wasterwater, such as (Cr(VI)), BrO₃^- (Br(V)) and SeO₃^2- (Se(IV)) have detrimental or toxic effects on individual health when their concentrations accumulated to a certain level. The conversion of these oxyanions into harmless/industrial-valuable products or removal from wastewater is of significance. Herein, we designed Pd sub-nanolayer on Au core catalysts supported on Al₂O₃ (sub-Pd-Au/Al₂O₃) for highly effective catalytic hydrogenation reduction of oxyanions under ambient conditions. The sub-Pd(0.049)-Au(0.927)/Al₂O₃ catalyst exhibited the highest catalytic activity and TOF value for Cr(VI), Br(V) and Se(IV) reduction, respectively, by optimizing the Pd loading amount. The synergistic effect between Pd sub-nanolayer and Au core enhanced catalytic activity by regulating the Pd dispersion and site property, according to thorough characterizations that included high-angle annular dark-field transmission electron microscopy (HAADF-TEM) image, in-situ CO-IR adsorption, CO chemisorption, and X-ray photoelectron spectroscopy (XPS). This work might provide some new lights on design of highly efficient catalysts for the elimination of oxyanion pollutants.

Keywords: Catalytic hydrogenation reduction; Oxyanion pollutant; Pd sub-nanolayer; Sub-Pd-Au/Al(2)O(3) catalyst; Synergistic effect.

MeSH terms

Hydrogenation
Microscopy, Electron, Transmission
Oxidation-Reduction
Palladium* / chemistry

Substances

chromium hexavalent ion
Palladium