Development of cation exchanger-based nano-CdS hybrid catalyst for visible-light photodegradation of rhodamine B from water  

作　　者：XIE YingMei LV Lu LI MingHui PAN BingCai CHEN Qun ZHANG WeiMing ZHANG QuanXing 

机构地区：[1]State Key Laboratory of Pollution Control and Resource Reuse School of the Environment,Nanjing University,Nanjing 210093,China [2]National Engineering Center for Organic Pollution Control and Resource Reuse(Suzhou Division),Suzhou High-Tech Institute of Nanjing University,Suzhou 215123,China [3]School of Chemistry and Chemical Engineering,Changzhou University,Changzhou 213164,China

出　　处：《Science China Chemistry》2012年第3期409-415,共7页中国科学（化学英文版）

基　　金：support from the National Natural Science Foundation of China (51008151 & 51078179);Jiangsu Natural Science Foundation (BK2009253);the Ministry of Education of China (200802840034);the National High Technology Research and Development Program of China (2009AA06A418)

摘　　要：A new polymeric nanocomposite photocatalyst A15-CdS with large spherical beads (0.70-0.80 mm in diameter) was fabricated for efficient Rhodamine B (RhB) photodegradation with facile separation during cyclic runs,and photocorrosion,a congenital drawback of CdS,was successfully inhibited for A15-CdS.The nanocomposite catalyst was obtained by impregnating CdS nanoparticles within porous polymeric cation exchanger A15 through a facile inner-surface deposition.CdS nanoparticles (<20 nm) immobilized in A15 were deliberately distributed within an outside ring-like region of 40-50 m in depth,which is dominant for photoreaction because visible light is not expected to permeate through the inner region of nontransparent A15.As expected,efficient RhB photodegradation by A15-CdS was achieved under visible light irradiation,and large-size A15-CdS beads are expected to result in their facile separation from solution for repeated use.More significantly,negligible photocorrosion for the hybrid catalyst A15-CdS was demonstrated by the constant photodegradation efficiency and negligible CdS loss during five-cycle runs.The results indicated that nano-CdS immobilization within A15 would greatly improve the applicability of CdS nanoparticles in practical environmental remediation.A new polymeric nanocomposite photocatalyst A15-CdS with large spherical beads （0.70-0.80 mm in diameter） was fabricat- ed for efficient Rhodamine B （RhB） photodegradation with facile separation during cyclic runs, and photocorrosion, a congen- ital drawback of CdS, was successfully inhibited for A15-CdS. The nanocomposite catalyst was obtained by impregnating CdS nanoparticles within porous polymeric cation exchanger A15 through a facile inner-surface deposition. CdS nanoparticles （〈20 nm） immobilized in A15 were deliberately distributed within an outside ring-like region of 40-50 ~m in depth, which is dom- inant for photoreaction because visible light is not expected to permeate through the inner region of nontransparent A15. As expected, efficient RhB photodegradation by A15-CdS was achieved under visible light irradiation, and large-size A15-CdS beads are expected to result in their facile separation from solution for repeated use. More significantly, negligible photocorro- sion for the hybrid catalyst A15-CdS was demonstrated by the constant photodegradation efficiency and negligible CdS loss during five-cycle runs. The results indicated that nano-CdS immobilization within A15 would greatly improve the applicability of CdS nanoparticles in practical environmental remediation.

关 键 词：nanocomposite catalyst CDS photocorrosion inhibition dye degradation visible light 

分 类 号：O621.256.4[理学—有机化学] TQ132[理学—化学]