Abstract In this work, the tunable introduction of oxygen vacancies in bismuth tungstate was realized via a simple solvothermal method with the assistance of iodine doping. With the predictions afforded by theoretical calculations, the as-prepared bismuth tungstate was characterized using various techniques, such as X-ray diffraction, Raman spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, electron spin resonance spectroscopy, and UV-Vis diffuse reflectance spectroscopy. The different concentrations of the oxygen vacancies on bismuth tungstate were found to be intensely correlated with iodine doping, which weakened the lattice oxygen bonds. Owing to the sufficient oxygen vacancies introduced in bismuth tungstate as a result of iodine doping, the molecular oxygen activation was remarkably enhanced, thus endowing bismuth tungstate with high activity for the photocatalytic degradation of sodium pentachlorophenate. More encouraging is the total organic carbon removal rate of sodium pentachlorophenate over iodine-doped bismuth tungstate that exceeded 90% in only 2 h and was 10.6 times higher than that of the pristine bismuth tungstate under visible light irradiation. Moreover, the mechanism, through which the degradation of sodium pentachlorophenate over iodine-doped bismuth tungstate is enhanced, was speculated based on the results of radical detection and capture experiments. This work provides a new perspective for the enhanced photocatalytic degradation of organochlorine pesticides from the oxygen vacancy-induced molecular oxygen activation over iodine-doped bismuth tungstate.

中文翻译：

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在钨酸铋光催化剂上碘掺杂辅助可调谐引入氧空位用于高效分子氧活化和五氯苯酚矿化

摘要 在这项工作中，在碘掺杂的辅助下，通过简单的溶剂热法实现了钨酸铋中氧空位的可调引入。根据理论计算提供的预测，使用各种技术对制备的钨酸铋进行表征，例如 X 射线衍射、拉曼光谱、扫描电子显微镜、透射电子显微镜、X 射线光电子能谱、电子自旋共振光谱和紫外-可见漫反射光谱。发现钨酸铋上不同浓度的氧空位与碘掺杂密切相关，碘掺杂削弱了晶格氧键。由于碘掺杂在钨酸铋中引入了足够的氧空位，分子氧活化显着增强，从而使钨酸铋具有很高的光催化降解五氯酚钠的活性。更令人鼓舞的是，五氯酚钠对碘掺杂钨酸铋的总有机碳去除率仅在 2 小时内就超过了 90%，是可见光照射下原始钨酸铋的 10.6 倍。此外，基于自由基检测和捕获实验的结果推测了五氯酚钠对碘掺杂钨酸铋的降解增强的机制。这项工作为通过氧空位诱导分子氧活化在碘掺杂钨酸铋上增强光催化降解有机氯农药提供了新的视角。