Synthesis of CdxZn1−xS@MIL-101(Cr) Composite Catalysts for the Photodegradation of Methylene Blue

• Published in: Nano : brief reports and reviews Vol. 13; no. 10; pp. 60 - 76
• Main Authors: Yang, Shipeng, Peng, Siwei, Zhang, Chunhui, He, Xuwen, Cai, Yaqi
• Format: Journal Article
• Language: English
• Published: Singapore World Scientific Publishing Company 01.10.2018; World Scientific Publishing Co. Pte., Ltd; 성균나노과학기술원
• Subjects: Catalysis; Catalysts; Chemical synthesis; Chromium; Heterojunctions; Light irradiation; Metal-organic frameworks; Methylene blue; Mineralization; Nanocomposites; Nanoparticles; Photocatalysis; Photodegradation; Reflectance; Synergistic effect; Ultraviolet reflection; Xenon lamps; 자연과학; methylene blue; CdxZn; photodegradation; S@MIL-101(Cr)
• ISSN: 1793-2920; 1793-7094
• DOI: 10.1142/S1793292018501187

Nanoparticles of the semiconductor catalyst CdxZn 1 − x S were embedded into the metal organic framework MIL-101(Cr) to obtain CdxZn 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 CdxZn 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 CdxZn 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 30 min. 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. The combination of CdxZn1–xS and MIL-101(Cr) can effectively inhibit the dissolution of heavy metals and improve the material's ability to resist light corrosion. Moreover, it can make the synergistic effect of photocatalysis and adsorption be utilized to increase the mineralization efficiency of the material to the organic matter.