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Synthesis of Cd_xZn $_{1 - x}$ S@MIL-101(Cr) Composite Catalysts for the Photodegradation of Methylene Blue

School of Chemistry and Environmental Engineering, China University of Mining and Technology, Beijing 11 Xueyuan Road, Beijing 100083, P. R. China

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Siwei Peng

School of Chemistry and Environmental Engineering, China University of Mining and Technology, Beijing 11 Xueyuan Road, Beijing 100083, P. R. China

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Chunhui Zhang

School of Chemistry and Environmental Engineering, China University of Mining and Technology, Beijing 11 Xueyuan Road, Beijing 100083, P. R. China

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Xuwen He

School of Chemistry and Environmental Engineering, China University of Mining and Technology, Beijing 11 Xueyuan Road, Beijing 100083, P. R. China

E-mail Address: hjinghua@vip.sina.com

Corresponding authors.

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, and

Yaqi Cai

Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 18, Shuangqing Road, Beijing 100085, P. R. China

University of Chinese Academy of Sciences, 19 (A), Yuquan Road, Beijing 100049, P. R. China

E-mail Address: caiyaqi@rcees.ac.cn

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https://doi.org/10.1142/S1793292018501187Cited by:4 (Source: Crossref)

Abstract

Nanoparticles of the semiconductor catalyst Cd_xZn $_{1 - x}$ S were embedded into the metal organic framework MIL-101(Cr) to obtain Cd_xZn $_{1 - x}$ S@MIL-101(Cr) nanocomposites. These materials not only possess high surface areas and mesopores but also show good utilization of light energy. The ultraviolet-visible diffuse reflectance patterns of Cd_xZn $_{1 - x}$ S@MIL-101(Cr) nanocomposites showed that Cd $_{0.8}$ Zn $_{0.2}$ S@MIL-101(Cr) possessed good visible light response ability among the synthesized nanocomposites. The photocatalytic performance of the Cd_xZn $_{1 - x}$ S@MIL-101(Cr) nanocomposites were tested via degradation and mineralization of methylene blue in neutral water solution under light irradiation using a 300W xenon lamp. As a result, using Cd $_{0.8}$ Zn $_{0.2}$ S@MIL-101(Cr) as a catalyst, 99.2% of methylene blue was mineralized within 30min. Due to the synergistic effect of adsorption by the MIL-101(Cr) component and photocatalytic degradation provided by the Cd $_{0.8}$ Zn $_{0.2}$ S component, the Cd $_{0.8}$ Zn $_{0.2}$ S@MIL-101(Cr) catalyst displayed superior photocatalytic performance relative to Cd $_{0.8}$ Zn $_{0.2}$ S and MIL-101(Cr). Furthermore, Cd $_{0.8}$ Zn $_{0.2}$ S@MIL-101(Cr) possessed excellent stability during photodegradation and exhibited good reusability. The remarkable photocatalytic performance of Cd $_{0.8}$ Zn $_{0.2}$ S@MIL-101(Cr) is likely due to the effective transfer of electrons and holes at the heterojunction interfaces.

Keywords:

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