化学
双酚A
试剂
可见光谱
分解
矿化(土壤科学)
吸附
动力学
光化学
降级(电信)
X射线光电子能谱
化学工程
有机化学
材料科学
工程类
氮气
环氧树脂
物理
电信
量子力学
光电子学
计算机科学
作者
Lijie Xu,Liang Meng,Xiaoxiao Zhang,Mei Xiang,Xuewen Guo,Wei Li,Ping Wang,Lu Gan
标识
DOI:10.1016/j.jhazmat.2019.120795
摘要
Merits of adding P25 to homogeneous photo-Fenton-like process (ph-F) were evaluated under visible light using Bisphenol A (BPA) as a model pollutant. Interactions between P25 and Fe3+/H2O2 were emphasized. Results show that adsorption of Fe(III) on P25 produced redshift of light absorption, and interactions between P25 and H2O2 promoted photoelectron generation, effectively introducing visible light into ph-F. The visible-light-driven ph-F demonstrated adequate performance at high Fe3+/H2O2 dosage, while P25 addition showed significant acceleration of BPA degradation with saving amount of Fe3+/H2O2. The mechanism was confirmed to be enhanced Fe3+/Fe2+ cycling by photo-electrons, particularly pronounced at low [Fe(III)]. Additionally, H2O2 was utilized more efficiently in P25-ph-F than that in ph-F by diminishing the radical scavenging role of H2O2 at lower [Fe(III)]. Kinetics and ESR analysis supported this mechanism. Compared to ph-F, the P25-ph-F process also demonstrated stronger potentials in degrading BPA at high concentrations and better mineralization capability with reduced Fe3+/H2O2 reagents. The sustainability of P25-ph-F was also examined in regard to its advantage under sunlight and the strong recyclable and reusable capability. BPA decomposition was dominated by •OH attack at both the aromatic ring and the connecting carbon, and P25-ph-F was more competent in transforming the primary intermediates than ph-F.
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