Photo-induced dissolution of Bi2O3 during photocatalysis reactions: Mechanisms and inhibition method
Photo-induced dissolution of Bi2O3 during photocatalysis reactions: Mechanisms and inhibition method
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DOI：
10.1016/j.jhazmat.2021.125267
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发表时间：
2021-02-03
影响因子：
13.6
通讯作者：
Peng, Xianjia
中科院分区：
文献类型：
--
作者：
Dou, Wenyue;Hu, Xingyun;Peng, Xianjia
光致溶解极大地限制了Bi2O3光催化剂在水处理中的应用。在本研究中，提出了光诱导Bi2O3溶解的机理。(1)在紫外光作用下，h+形成并扩散穿过Bi2O3。(2)到达Bi2O3表面的h+可视为单原子氧离子（OS-），与晶格成弱键。(3)两个OS-结合，生成的（O-O）2-离子基被h+氧化，导致O2释放，Bi2O3溶解。然而，用聚苯胺（PANI）对Bi2O3进行改性，极大地抑制了Bi2O3在紫外线下的溶解。在PANI与Bi2O3质量比为1.5%的条件下，由于h+从bh -Bi2O3中分离到HOMO-PANI，生成的Bi3+浓度从2.02 mg/m2显著降低到0.27 mg/m2，亚甲基蓝（MB）降解效率高达98.3%。该研究为Bi2O3改性及在水处理中的应用提供了理论基础。
Photo-induced dissolution greatly limits the application of Bi2O3 photocatalyst in water treatment. In this study, mechanisms for the photo-induced dissolution of Bi2O3 were proposed. (1) Under UV light, h+ forms and diffuses through Bi2O3. (2) The h+, which reaches the surface of Bi2O3 and can be regarded as a monatomic oxygen ion (OS-), is weakly bonded to the crystal lattice. (3) Two OS- combine and the generated (O-O)2- ionic group is oxidized by h+, resulting in the release of O2 and dissolution of Bi2O3. However, modification of Bi2O3 using polyaniline (PANI) greatly inhibits Bi2O3 dissolution under UV. Under the PANI to Bi2O3 mass ratio of 1.5%, the concentration of produced Bi3+ significantly decreased from 2.02 to 0.27 mg/m2 with a high methylene blue (MB) degradation efficiency of 98.3%, thanks to the separation of h+ from VB-Bi2O3 to HOMO-PANI. This study provided the theoretical foundation for the modification and application of Bi2O3 in water treatment.