Insights into copper(I) phenylacetylide with in-situ transformation of oxygen and enhanced visible-light response for water decontamination: Cu–O bond promotes exciton dissociation and charge transfer

作者：Zili Lin, Zhenjun Xiao, Yang Liu, Yishun Wang, Shuyue Chen, Jinfan Zhang, Yingyi Chen, Xiaoyu Zhang, Ge ZHANG, Daguang Li, Wenying Lv, Ping Chen, Guoguang Liu · 发表于：Journal of Colloid and Interface Science · 年份：2024 · DOI：10.1016/j.jcis.2024.05.159 · 被引用次数：29 · 研究领域：Advanced Photocatalysis Techniques、Copper-based nanomaterials and applications、Nanomaterials for catalytic reactions

The widespread contamination of hexavalent chromium (Cr(VI)), pharmaceuticals and personal care products (PPCPs), and dyes is a growing concern. necessitating the development of convenient and effective technologies for their removal. Copper(I) phenylacetylide (PhC 2 Cu) has emerged as a promising photocatalyst for environmental remediation. In this study, we introduced a functional Cu–O bond into PhC 2 Cu (referred to as OrPhC 2 Cu) by creatively converting the adsorbed oxygen on the surface of PhC 2 Cu into a Cu–O bond to enhance the efficiency of Cr(VI) photoreduction, PPCPs photodegradation , and dyes photodegradation through a facile vacuum activating method. The incorporation of the Cu–O bond optimized the electron structure of OrPhC 2 Cu, facilitating exciton dissociation and charge transfer. The exciton dissociation behavior and charge transfer mechanism were systematically investigated for the first time in the OrPhC 2 Cu system by photoelectrochemical tests, fluorescence and phosphorescence (PH) techniques, and density functional theory (DFT) calculations. Remarkably, the enhanced visible-light response of OrPhC 2 Cu improved photon utilization and significantly promoted the generation of reactive species (RSs), leading to the highly efficient Cr(VI) photoreduction (98.52% within 25 min) and sulfamethazine photodegradation (94.65% within 60 min), with 3.91 and 5.23 times higher activity compared to PhC 2 Cu. Additionally, the photocatalytic efficiency of OrPhC 2 Cu ...