通过静电自组装Fe掺杂Bi₂WO₆与TiO₂构成异质结，利用XRD、FT-IR、SEM、PL光谱、电化学阻抗谱等手段对催化剂的组成、结构以及光电性能进行表征。以在可见光、H₂O₂条件下降解亚甲基蓝（MB）为模型反应，评价了Fe-Bi₂WO₆/TiO₂的光芬顿反应性能并解释了反应机理。由于光催化反应和芬顿氧化反应之间的协同作用，催化剂表现出优异的光芬顿催化性能，在70 min内可以降解96.2%的MB（50 mg/L）。由于Fe掺杂Bi₂WO₆与TiO₂存在静电吸引作用，两者构成紧密接触的异质结界面，促进了光生电荷的分离和传递，加速了Fe³⁺/Fe²⁺的循环，从而促进H₂O₂分解产生羟基自由基高效降解有机污染物。

A heterojunction is constructed by electrostatic self-assembly of Fe doped Bi₂WO₆ and TiO₂.The composition, structure and photoelectrochemical properties of the catalyst are characterized by XRD, FT-IR, SEM, PL spectra and electrochemical impedance spectra, etc.The degradation of methylene blue under visible light and hydrogen peroxide is taken as the model reaction to evaluate the photo-Fenton reaction performance of the catalyst and the reaction mechanism is proposed.Due to synergistic effect between photocatalysis and Fenton oxidation reactions, the catalyst shows excellent photo-Fenton reaction performance, which can degrade 96.2% of methylene blue (50 mg·L^-1) within 70 min.A closely contacted heterojunction interface is formed due to the electrostatic attraction between Fe doped Bi₂WO₆ and TiO₂, which promotes the separation and transfer of photogenerated charges and accelerates the cycle of Fe²⁺/Fe³⁺.Thus, hydrogen peroxide is promoted to decompose into hydroxyl radicals to degrade organic pollutants efficiently.

王振远(1996-),男,硕士生,研究方向为非均相芬顿催化剂的制备及其性能研究,zhenyuanw001@163.com