Nanosized cadmium sulfide in polyelectrolyte protected mesoporous sphere: A stable and regeneratable photocatalyst for visible-light-induced removal of organic pollutants

作者：Yang You Hao; Ren Nan; Zhang Ya Hong; Tang Yi^*

来源：Journal of Photochemistry and Photobiology A: Chemistry , 2009, 201(2-3): 111-120.

DOI：10.1016/j.jphotochem.2008.10.012

• Visible-light-induced photocatalysis
• Degradation of organic compound
• Cadmium sulfide
• Mesoporous silica sphere
• Photocorrosion

An unusually stable and regeneratable nanosized CdS-based catalyst for visible-light-induced photocatalysis was developed by combining the protection effect of polyelectrolyte and the spatial confinement of mesopores. This catalyst was fabricated by coating a layer of poly(diallyl dimethylammonium) chloride (PDDA) around nanosized US pre-incorporated hexagonal mesoporous silica (HMS) sphere, and named as CdS/HMS-PDDA. In contrast to the catalyst without PDDA-coating (CdS/HMS), which loses its activity at 3rd run, CdS/HMS-PDDA can completely degrade the organic pollutants for over 22 runs. Noticeably, CdS/HMS-PDDA can be facilely regenerated by H(2)S treatment, and the catalyst shows the same capability as the fresh one even after 6 regenetations (accumulatively 151 runs). No cadmium leakage is detected from CdS/HMS-PDDA during the photocatalytic processes, promising its environmental compatibility. A series of characterization experiments reveal that the polyelectrolyte layer effectively prevents the cadmium species from leakage, and further delays the photocorrosion of US via a back reaction occurred by use of photogenerated electrons remaining in US, endowing the catalyst with high stability and regeneratability.

• 出版日期2009-1-25
• 单位复旦大学