Effect of surface iodine atom on dissolved oxygen activation for enhanced photocatalytic advanced oxidation processes over Bi2WO6 nanosheet

IF 6.5 1区化学 Q2 CHEMISTRY, PHYSICAL Journal of Catalysis Pub Date : 2024-12-17 DOI:10.1016/j.jcat.2024.115909

Ji-Chao Wang, Haoran Ma, Weina Shi, Wanqing Zhang, Jinyu Wang, Yuxia Hou, Xiaonan Zheng, Jingjie Liu, Junhao Zhao

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Abstract

Facing with the growing demand of wastewater purification in industry and human being, the effect of catalyst on the activation of dissolved oxygen molecule plays a critical role for advanced oxidation processes (AOPs). Surface I atom-doped Bi₂WO₆ (I-BWO) sheet was successfully synthesized through a two-step hydrothermal method. The decomposition degradation efficiencies of p-chlorophenol and rhodamine B pollutants for the optimized 2I-BWO sample were 14.5 times and 11.0 times than those of the pristine Bi₂WO₆. The MS results about intermediates explained the mechanism of 4-CP and RhB degradation. Facing with other four organic pollutants such as methylene blue, methyl orange, 4-nitrophenol and tetracycline, the COD removal efficiencies were also observably declined through the photocatalysis. Based on experimental and computational results, the surface I atom caused the disorder of surface structure, forming superior adsorption and activation site of dissolved oxygen molecule. Multiple oxidizing species including superoxide radical, hydroxide radical, singlet oxygen and hydrogen peroxide, were proven to be generated on the modified surface of Bi₂WO₆ sheet. This study contributes to understanding the impact of in iodine doping on surface structural regulation, thereby facilitating rational design of efficient photocatalysts for AOPs.

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随着工业和人类对废水净化需求的不断增长，催化剂对溶解氧分子活化的影响对高级氧化工艺（AOPs）起着至关重要的作用。通过两步水热法成功合成了表面 I 原子掺杂的 Bi2WO6（I-BWO）薄片。优化的 2I-BWO 样品对对氯苯酚和罗丹明 B 污染物的分解降解效率分别是原始 Bi2WO6 的 14.5 倍和 11.0 倍。有关中间产物的质谱结果解释了 4-CP 和 RhB 的降解机理。面对其他四种有机污染物，如亚甲基蓝、甲基橙、4-硝基苯酚和四环素，光催化对 COD 的去除率也明显下降。根据实验和计算结果，表面 I 原子造成了表面结构的紊乱，形成了溶解氧分子的优良吸附和活化位点。实验证明，在改性后的 Bi2WO6 片材表面生成了多种氧化物种，包括超氧自由基、氢氧自由基、单线态氧和过氧化氢。这项研究有助于了解碘掺杂对表面结构调节的影响，从而有助于合理设计用于 AOPs 的高效光催化剂。

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来源期刊

Journal of Catalysis 工程技术-工程：化工

CiteScore

12.30

自引率

5.50%

发文量

447

审稿时长

31 days

期刊介绍： The Journal of Catalysis publishes scholarly articles on both heterogeneous and homogeneous catalysis, covering a wide range of chemical transformations. These include various types of catalysis, such as those mediated by photons, plasmons, and electrons. The focus of the studies is to understand the relationship between catalytic function and the underlying chemical properties of surfaces and metal complexes. The articles in the journal offer innovative concepts and explore the synthesis and kinetics of inorganic solids and homogeneous complexes. Furthermore, they discuss spectroscopic techniques for characterizing catalysts, investigate the interaction of probes and reacting species with catalysts, and employ theoretical methods. The research presented in the journal should have direct relevance to the field of catalytic processes, addressing either fundamental aspects or applications of catalysis.