光催化
吸附
材料科学
热液循环
降级(电信)
化学工程
朗缪尔吸附模型
无机化学
核化学
化学
催化作用
有机化学
工程类
电信
计算机科学
作者
Hao Wu,Xuezhu Liu,Jing Wen,Yong Liu,Xiaogang Zheng
标识
DOI:10.1016/j.colsurfa.2020.125933
摘要
Mg-Al layered double oxides (LDO) nanosheets were modified by rare-earth oxides such as La2O3, Sm2O3, and Er2O3 (M/Mg-Al, M = La, Sm, and Er) via a one-pot hydrothermal route for the solar-light induced adsorption-photocatalytic degradation of tetracycline hydrochloride (TCH). These rare-earth oxides can greatly enhance the adsorption-photocatalytic activity of Mg-Al based composites, especially La2O3. It’s attributed to the efficient adsorption of vacant sites and the rapid transfer and separation of charge carriers at the junction interface. The La2O3 content, pH value, and inorganic ions intensively affect the adsorption-photocatalytic performance of La/Mg-Al. The optimal 2-La/Mg-Al with the La2O3 content of 4.35 % exhibits the best removal efficiency of TCH and the excellent photocatalytic durability. The removal efficiency of TCH (100 mg L−1) is 99.87 % within 110 min, and reduces to 95.88 % after five cycle times. The adsorption isotherms and kinetic behaviors of M/Mg-Al (M = La, Sm, and Er) for TCH removal are well described by Langmuir isotherm and second-order model, respectively. The active radicals such as OH and O2− are responsible for the solar light driven photocatalytic degradation of TCH.
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