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

机译：以磁性粉煤灰空心球为载体的新型CdS光催化剂：性能与机理

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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.
机译：磁性光催化剂是通过化学沉积使CdS纳米粒子直接生长在磁性飞灰中空（MFAC）表面上而合成的。甲磺酸达氟沙星的光降解（76.2％）表明，在可见光照射下，CdS / MFACs的光催化活性高于纯CdS（71.5％）。此外，所制备的光催化剂相对稳定并且在5个循环后显示出良好的可重复使用性。 CdS / MFACs的合理光催化机理已通过反应性物种捕获得到了证实，并进一步被ESR和自由基清除物种DMPO所证实。此外，定性羟基自由基分析表明（OH）-O-中心点在光催化降解过程中存在，并且仅由CdS / MFACs导带中的光生电子产生。此外，实验结果表明，甲氧氟沙星甲磺酸盐的光降解与O-中心点（2）-和光生孔有关。最后，讨论了甲氧氟沙星甲磺酸盐的光催化降解反应动力学和光降解机理。

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