Innovative Photocatalytic Framework Fe3+-Bi2WO6: Efficient Photocatalytic Degradation of Tetracycline Antibiotics and Mechanistic Studies

IF 3.6 4区 化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR
Hui Sun, Bingge Chen, Gaoyang Liang, Jingqi Jia, Wangjun Pei, Hongxia Jing
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Abstract

Enhancing the visible light response activity of semiconductor photocatalytic materials is a core challenge in the field of environmental catalysis. Transition metal doping has become an effective modification strategy due to its tunable electronic structure characteristics. In this study, aiming at the problems of high carrier recombination rate and insufficient visible light response of Bi2WO6 photocatalyst, a Fe3+ doping modification strategy was proposed. Fe3+-doped Bi2WO6 (Fe3+-Bi2WO6) was synthesized by hydrothermal-calcination method, and its visible light photocatalytic degradation performance for tetracycline (TC) was systematically evaluated. Based on the ion radius matching characteristics of Fe3+ (0.0645 nm) and W6+ (0.060 nm), Fe3+ directionally replaces the W6+ site in the Bi2WO6 lattice and induces the formation of oxygen vacancies. The characterization results show that the specific surface area of Fe3+-Bi2WO6 is increased to 29.82 m2/g (the original phase is 24.00 m2/g). The response range of its absorption spectrum in the visible region has been significantly expanded (the band gap is reduced from 2.90 eV to 2.58 eV), and the photocurrent density reaches 0.835 × 10− 3 mA/cm2 (the original phase is 0.356 × 10− 3 mA/cm2). When the doping ratio was optimized (Fe3+: Bi2WO6 = 0.26:100), the degradation rate of TC reached 85.97% within 60 min, and the reaction rate constant (0.03027 min⁻1) was 1.53 times higher than that of the original phase. The mechanism investigation reveals that the abundance of oxygen vacancies not only significantly enhances the separation of photogenerated charge carriers but also effectively increases the number of active sites; at the same time, Fe3+ acts as an electron trap to inhibit recombination, and the dominant active species (·O2 and h+) synergistically achieve efficient degradation. This work provides new insights for designing cost-effective transition metal-doped bismuth-based photocatalysts.

Abstract Image

新型光催化框架Fe3+-Bi2WO6:高效光催化降解四环素类抗生素及其机理研究
提高半导体光催化材料的可见光响应活性是环境催化领域的核心挑战。过渡金属掺杂由于其电子结构可调的特点而成为一种有效的改性策略。本研究针对Bi2WO6光催化剂载流子复合率高、可见光响应不足的问题,提出了Fe3+掺杂改性策略。采用水热煅烧法合成了Fe3+掺杂Bi2WO6 (Fe3+-Bi2WO6),并对其可见光催化降解四环素(TC)的性能进行了系统评价。基于Fe3+ (0.0645 nm)和W6+ (0.060 nm)的离子半径匹配特性,Fe3+定向取代Bi2WO6晶格中的W6+位点,诱导氧空位的形成。表征结果表明,Fe3+-Bi2WO6的比表面积提高到29.82 m2/g(原相为24.00 m2/g)。其吸收光谱在可见光区的响应范围明显扩大(带隙从2.90 eV减小到2.58 eV),光电流密度达到0.835 × 10−3 mA/cm2(原相0.356 × 10−3 mA/cm2)。当掺杂比优化(Fe3+: Bi2WO6 = 0.26:100)时,60 min内TC的降解率达到85.97%,反应速率常数(0.03027 min - 1)是原相的1.53倍。机理研究表明,氧空位的丰度不仅显著促进了光生载流子的分离,而且有效地增加了活性位点的数量;同时,Fe3+作为电子陷阱抑制重组,优势活性物质(·O2−和h+)协同实现高效降解。这项工作为设计具有成本效益的过渡金属掺杂铋基光催化剂提供了新的见解。
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来源期刊
Journal of Cluster Science
Journal of Cluster Science 化学-无机化学与核化学
CiteScore
6.70
自引率
0.00%
发文量
166
审稿时长
3 months
期刊介绍: The journal publishes the following types of papers: (a) original and important research; (b) authoritative comprehensive reviews or short overviews of topics of current interest; (c) brief but urgent communications on new significant research; and (d) commentaries intended to foster the exchange of innovative or provocative ideas, and to encourage dialogue, amongst researchers working in different cluster disciplines.
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