A novel CdS photocatalyst based on magnetic fly ash cenospheres as the carrier: performance and mechanism

作者：He, Ming; Lu, Ziyang; Zhou, Weichao; Chen, Tingting; Shi, Weidong; Che, Guangbo; Huo, Pengwei; Zhu, Zhi; Zhao, Xiaoxu^*; Yan, Yongsheng

来源：RSC Advances, 2014, 4(104): 60148-60157.

DOI：10.1039/c4ra06593j

• TEMPLATE-FREE SYNTHESIS
• SULFIDE QUANTUM DOTS
• VISIBLE-LIGHT
• HYDROGEN-PRODUCTION
• WASTE-WATER
• DEGRADATION
• NANOCOMPOSITES
• MICROSPHERES
• COMPOSITES
• AU

A magnetic photocatalyst was synthesized by direct growth of CdS nanoparticles on the surface of magnetic fly ash cenospheres (MFACs) through chemical deposition. The photodegradation of danofloxacin mesylate (76.2%) demonstrated that CdS/MFACs exhibited higher photocatalytic activity than that of pure CdS (71.5%) under visible light irradiation. Moreover, the as-prepared photocatalyst was relatively stable and displayed good reusability after 5 cycles. A reasonable photocatalytic mechanism for CdS/MFACs was verified by reactive species trapping, and further confirmed by ESR and a radical scavenging species, DMPO. Furthermore, qualitative hydroxyl radical analysis showed that (OH)-O-center dot was present during the photocatalytic degradation process and was only generated from the photogenerated electrons in the conduction band of CdS/MFACs. In addition, the experimental results showed that the photodegradation of danofloxacin mesylate is associated with O-center dot(2)- and photogenerated holes. Finally, the photocatalysis degradation reaction kinetics and the mechanism of photodegradation of danofloxacin mesylate were also discussed.

• 出版日期2014
• 单位江苏大学; 吉林师范大学