| Autor: |
Ren, Xinghao, Yao, Hang, Tang, Rui, A, Rong, Yuan, Shoujun, Wang, Wei, Ali, Ibrahim Mohamed, Hu, Zhen-Hu |
| Předmět: |
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| Zdroj: |
Environmental Science & Pollution Research; Mar2023, Vol. 30 Issue 12, p35023-35033, 11p |
| Abstrakt: |
As a typical wide band gap photocatalyst, titania (TiO2) cannot use the visible light and has fast recombination rate of photogenerated electron–hole pairs. Simultaneous introduction of erbium ion (Er3+) and graphene oxide (rGO) into TiO2 might overcome these two drawbacks. In this study, Er3+ and rGO were co-doped on TiO2 to synthesize Er3+-rGO/TiO2 photocatalyst through a two-step sol–gel method. Based on the UV–visible diffuse reflectance spectra and photoluminescence spectrum, the introduction of Er3+ and rGO increased the visible light absorption efficiency and enhanced the migration of photogenerated electron. Pure TiO2 has almost no photocatalytic activity for arsanilic acid (p-ASA) degradation under visible light irradiation. However, while doping with 2.0 mol% Er3+ and 10.0 mol% rGO, the p-ASA could be completely degraded within 50 min by the Er3+-rGO/TiO2 photocatalyst under visible light irradiation, and most of produced inorganic arsenic was in situ removed by adsorption from the solution. The reactive oxygen species (ROS) reacting with p-ASA was determined and superoxide radical (O2•−) and singlet oxygen (1O2) were the dominant ROS for the oxidation of p-ASA and arsenite. This work provides an approach of introducing Er3+ and rGO to enhance the visible light photocatalytic efficiency of TiO2. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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