光催化
光降解
甲基橙
催化作用
材料科学
亚甲蓝
激进的
结晶度
降级(电信)
复合材料
光化学
可见光谱
核化学
化学工程
化学
有机化学
工程类
电信
光电子学
计算机科学
作者
Li Jin,Hong‐Yan Zeng,Sheng Xu,Chao-Rong Chen,Heng-Zhi Duan,Jinze Du,Hu Guo,Yunxin Sun
出处
期刊:Chinese Journal of Catalysis
[China Science Publishing & Media Ltd.]
日期:2018-11-01
卷期号:39 (11): 1832-1841
被引量:16
标识
DOI:10.1016/s1872-2067(18)63120-1
摘要
[email protected] ([email protected]) composites were designed and prepared based on the assembly of layered double hydroxides (LDH) on acidified sepiolites (Sep) for the simultaneous photocatalytic degradation of methyl orange (MO) and methylene blue (MB). The structure, morphology, texture, optical properties, and photocatalytic performance of the prepared [email protected] were studied in detail. Among the [email protected] composites, Sep4@LDH (4.0 g Sep) exhibited the highest photocatalytic activity under visible-light irradiation, which could be attributed to its large surface area, high crystallinity, and plentiful active sites on its surface. The photodegradation of the dyes followed a pseudo first-order kinetic model (Langmuir-Hinshelwood model), indicating that the copious and homogeneous active sites on the surface of the composites contributed to the high photocatalytic activity. The photodegradation mechanism was studied by examining the active species (•OH, h+, and •O2− anions) using appropriate scavengers. It was found that •OH radicals played a critical role in the photocatalytic process of MO and MB, where the generation of •OH radicals occurred on the electron/hole (e−/h+) pairs on the surface of the [email protected] composites.
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