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用于增强光电化学和光催化性能的氧化石墨烯修饰的BiVO/AgCrO异质结复合材料的制备

Fabrication of BiVO/AgCrO heterojunction composites modified with graphene oxide for enhanced photoelectrochemical and photocatalytic performance.

作者信息

Oluwole Adewunmi Olufemi, Yusuf Tunde L, Tichapondwa Shepherd M, Daramola Michael O, Iwarere Samuel A

机构信息

Department of Chemical Engineering, Faculty of Engineering, Built Environment and Information Technology, University of Pretoria Hatfield Pretoria 0002 South Africa

Department of Chemistry, Faculty of Natural and Agricultural Sciences, University of Pretoria Hatfield Pretoria 0002 South Africa.

出版信息

RSC Adv. 2024 Nov 29;14(51):38044-38058. doi: 10.1039/d4ra07144a. eCollection 2024 Nov 25.

DOI:10.1039/d4ra07144a
PMID:39619807
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11605679/
Abstract

A novel GO/BiVO/AgCrO heterojunction photocatalyst was prepared by depositing AgCrO on the highly active (040) facet of BiVO, followed by incorporating graphene oxide (GO) through an precipitation method. This synergistic modification of BiVO by AgCrO and GO results in excellent photocatalytic performance, with a degradation efficiency of 94.6% coupled with a maximum rate constant of 0.223 min, which is 2.40, 2.19 and 0.66 times higher than that of BiVO, AgCrO, and BiVO/AgCrO, respectively, for the degradation of ciprofloxacin (CIP) under visible light irradiation. The degradation efficiency of ciprofloxacin was evaluated using total organic carbon (TOC) analysis. Under investigated conditions, the GO/BiVO/AgCrO photocatalyst achieved a TOC reduction of 63.4%. The enhanced photocatalytic performance is attributed to the beneficial role of GO in facilitating electron transport for photo-charge carrier migration, leading to strong interfacial coupling between BiVO and AgCrO, which in turn promotes efficient charge separation and transfer. The physicochemical properties of the fabricated heterojunction photocatalysts were characterized using X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM) coupled with energy-dispersive X-ray (EDX) analysis, Brunauer-Emmett-Teller (BET) analysis, Fourier-transform infrared (FTIR) spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy (UV-DRS), and photoluminescence (PL) emission spectroscopy, while the photoelectrochemical properties of the fabricated photocatalyst were investigated through electrochemical impedance spectroscopy (EIS), Mott-Schottky plots, and photocurrent response analysis. The scavenging experiment was conducted to confirm the role of H and ·O in the photocatalytic degradation of ciprofloxacin, which aids in proposing probable degradation mechanism for ciprofloxacin under visible light irradiation. Hence, this study offers an effective strategy for fabricating heterojunction photocatalysts aimed at enhancing the photodegradation of pollutants in wastewater.

摘要

通过将AgCrO沉积在BiVO的高活性（040）晶面上，然后采用沉淀法引入氧化石墨烯（GO），制备了一种新型的GO/BiVO/AgCrO异质结光催化剂。AgCrO和GO对BiVO的这种协同改性产生了优异的光催化性能，在可见光照射下对环丙沙星（CIP）的降解效率为94.6%，最大速率常数为0.223 min⁻¹，分别比BiVO、AgCrO和BiVO/AgCrO高2.40倍、2.19倍和0.66倍。使用总有机碳（TOC）分析评估环丙沙星的降解效率。在所研究的条件下，GO/BiVO/AgCrO光催化剂实现了63.4%的TOC降低。光催化性能的增强归因于GO在促进光生电荷载流子迁移的电子传输方面的有益作用，导致BiVO和AgCrO之间形成强界面耦合，进而促进有效的电荷分离和转移。使用X射线衍射（XRD）、场发射扫描电子显微镜（FE-SEM）、透射电子显微镜（TEM）结合能量色散X射线（EDX）分析、布鲁诺尔-埃米特-泰勒（BET）分析、傅里叶变换红外（FTIR）光谱、紫外可见漫反射光谱（UV-DRS）和光致发光（PL）发射光谱对制备的异质结光催化剂的物理化学性质进行了表征，同时通过电化学阻抗谱（EIS）、莫特-肖特基图和光电流响应分析研究了制备的光催化剂的光电化学性质。进行了清除实验以确认H⁺和·O₂⁻在环丙沙星光催化降解中的作用，这有助于提出可见光照射下环丙沙星可能的降解机制。因此，本研究为制备旨在增强废水中污染物光降解的异质结光催化剂提供了一种有效策略。

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