Preparation and characterisation of a Bi2WO6/ZnFe2O4 heterojunction photoanode for photoelectrocatalytic degradation of ciprofloxacin in water

IF 2.6 4区 化学 Q3 ELECTROCHEMISTRY
Tsholofelo I. Sebokolodi, Dimpo S. Sipuka, Kehinde D. Jayeola, Omotayo A. Arotiba
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引用次数: 0

Abstract

Towards understanding the effect of light and voltage on a Bi2WO6/ZnFe2O4 heterojunction photoanode for use in wastewater treatment, we report the synthesis and application of a Bi2WO6/ZnFe2O4 heterojunction for the degradation of ciprofloxacin in synthetic and real wastewater. The pristine and heterojunction semiconductors were characterized using X-ray diffraction, X-ray photoelectron spectroscopy, UV–Vis diffuse reflectance spectroscopy, photoluminescence, and transmission electron microscopy. Electrochemical impedance spectroscopy, chronoamperometry, photoluminescence, and Mott-Schottky were used to study the electrochemical and photoelectrocatalytic properties of the pristine and heterojunction photoanodes. The Bi2WO6/ZnFe2O4 showed enhanced electro and photocatalytic properties deduced from the lowest charge transfer resistance and highest photocurrent response. The high degradation of the pollutant at the heterojunction was attributed to the type-(II) mechanism that allowed direct oxidation of the pollutant by the holes. The Bi2WO6/ZnFe2O4 heterojunction demonstrated excellent stability and reusability up to seven cycles. This work is a demonstration of the effect of heterojunction photoanode formation on the performance of PEC in the removal of organic pollutants in water.

Bi2WO6/ZnFe2O4异质结光阳极的制备与表征
为了了解光和电压对Bi2WO6/ZnFe2O4异质结光阳极用于废水处理的影响,我们报道了Bi2WO6/ZnFe2O4异质结光阳极的合成和应用,用于降解合成和实际废水中的环丙沙星。采用x射线衍射、x射线光电子能谱、UV-Vis漫反射光谱、光致发光和透射电子显微镜对原始半导体和异质结半导体进行了表征。采用电化学阻抗谱、时安培法、光致发光法和Mott-Schottky法研究了原始光阳极和异质结光阳极的电化学和光电催化性能。Bi2WO6/ZnFe2O4具有较低的电荷转移电阻和较高的光电流响应,因此具有较强的电催化和光催化性能。污染物在异质结处的高降解归因于-(II)型机制,该机制允许污染物被孔直接氧化。Bi2WO6/ZnFe2O4异质结具有优异的稳定性和长达7次循环的可重复使用性。这项工作证明了异质结光阳极的形成对PEC去除水中有机污染物性能的影响。
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来源期刊
CiteScore
4.80
自引率
4.00%
发文量
227
审稿时长
4.1 months
期刊介绍: The Journal of Solid State Electrochemistry is devoted to all aspects of solid-state chemistry and solid-state physics in electrochemistry. The Journal of Solid State Electrochemistry publishes papers on all aspects of electrochemistry of solid compounds, including experimental and theoretical, basic and applied work. It equally publishes papers on the thermodynamics and kinetics of electrochemical reactions if at least one actively participating phase is solid. Also of interest are articles on the transport of ions and electrons in solids whenever these processes are relevant to electrochemical reactions and on the use of solid-state electrochemical reactions in the analysis of solids and their surfaces. The journal covers solid-state electrochemistry and focusses on the following fields: mechanisms of solid-state electrochemical reactions, semiconductor electrochemistry, electrochemical batteries, accumulators and fuel cells, electrochemical mineral leaching, galvanic metal plating, electrochemical potential memory devices, solid-state electrochemical sensors, ion and electron transport in solid materials and polymers, electrocatalysis, photoelectrochemistry, corrosion of solid materials, solid-state electroanalysis, electrochemical machining of materials, electrochromism and electrochromic devices, new electrochemical solid-state synthesis. The Journal of Solid State Electrochemistry makes the professional in research and industry aware of this swift progress and its importance for future developments and success in the above-mentioned fields.
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