Facile synthesis of direct Z-scheme UiO-66-NH2/PhC2Cu heterojunction with ultrahigh redox potential for enhanced photocatalytic Cr(VI) reduction and NOR degradation

Zili Lin; Yuliang Wu; Xiaoyu Jin; Danluo Liang; Yuhan Jin; Shoubin Huang; Zhongquan Wang; Haijin Liu; Ping Chen; Wenying Lv; Guoguang Liu

doi:10.1016/j.jhazmat.2022.130195

Facile synthesis of direct Z-scheme UiO-66-NH₂/PhC₂Cu heterojunction with ultrahigh redox potential for enhanced photocatalytic Cr(VI) reduction and NOR degradation

J Hazard Mater. 2023 Feb 5;443(Pt A):130195. doi: 10.1016/j.jhazmat.2022.130195. Epub 2022 Oct 14.

Authors

Zili Lin¹, Yuliang Wu², Xiaoyu Jin¹, Danluo Liang¹, Yuhan Jin¹, Shoubin Huang¹, Zhongquan Wang¹, Haijin Liu³, Ping Chen¹, Wenying Lv⁴, Guoguang Liu⁵

Affiliations

¹ Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
² Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China; Shenzhen Key Laboratory of Organic Pollution Prevention and Control, Environmental Science and Engineering Research Center, Harbin Institute of Technology, Shenzhen, Guangdong 518055, China.
³ Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, School of Environment, Henan Normal University, Xinxiang 453007, China.
⁴ Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: lvwy612@163.com.
⁵ Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, Guangdong-Hong Kong-Macao Joint Laboratory for Contaminants Exposure and Health, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China. Electronic address: liugg615@163.com.

PMID: 36367468
DOI: 10.1016/j.jhazmat.2022.130195

Abstract

Z-scheme heterojunction-based photocatalysts typically have robust removal efficiencies for water contaminants. Herein, we employed p-type PhC₂Cu and n-type UiO-66-NH₂ to develop a direct Z-scheme UiO-66-NH₂/PhC₂Cu photocatalyst with an ultrahigh redox potential for Cr(VI) photoreduction and norfloxacin (NOR) photodegradation. Moreover, UV-vis diffuse reflectance, photoelectrochemical measurements, photoluminescence (PL) spectra and electron spin resonance (ESR) technique revealed that the UiO-66-NH₂/PhC₂Cu composite boosted light capturing capacities to promote photocatalytic efficiencies. Strikingly, the optimized UiO-66-NH₂/PhC₂Cu50 wt% rapidly reduced Cr(VI) (96.2%, 15 min) and degraded NOR (97.9%, 60 min) under low-power blue LED light. In addition, the UiO-66-NH₂/PhC₂Cu photocatalyst also exhibited favorable mineralization capacity (78.4%, 120 min). Benefitting from the enhanced interfacial electron transfer and ultrahigh redox potential of the Z-scheme heterojunction, the UiO-66-NH₂/PhC₂Cu photocatalyst greatly enhanced the separation efficacies of photogenerated carriers. This resulting abundance of active species (e.g., e^-, h⁺, O₂^•-, and •OH) were generated to photo-reduce Cr(VI) and photo-oxidize NOR. Base on the identified intermediates, four degradation pathways of NOR were proposed. Finally, the Z-scheme mechanism were systematically confirmed through X-ray photoelectron spectroscopy (XPS), ESR, cyclic voltammetry (CV) tests, and photodeposition techniques.

Keywords: Copper-phenylacetylide; Cr(VI) photoreduction; Norfloxacin photodegradation; Photocatalytic; Z-scheme heterojunction.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Catalysis
Norfloxacin* / chemistry
Oxidation-Reduction
Photochemical Processes*

Substances

Norfloxacin
chromium hexavalent ion
UiO-66