Stability of colloidal solutions containing various surface-modified cadmium sulfide particles under stationary illumination |
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| Affiliation: | 1. Department of Gynaecology, Linyi Central Hospital, Linyi 276400, Shandong, China;2. Delivery Room, Linyi Central Hospital, Linyi 276400, Shandong, China;3. Department of Emergency, Linyi Central Hospital, Linyi 276400, Shandong, China;1. School of Advanced Chemical Sciences, Shoolini University, Solan (Himachal Pradesh)-173212, India;2. Center of Excellence for Advanced Materials Research, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia;3. Chemistry Department, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia;4. Faculty of Biotechnology, Binh Duong University, Thu Dau Mot, Vietnam.;5. Department of Materials Science and Engineering, Korea University, 145, Anam-ro Seongbuk-gu, Seoul 02841, South Korea;6. Department of Chemistry, Smt. Devkiba Mohansinhji Chauhan College of Commerce and Science, Silvassa 396 230, University of Mumbai, Dadra and Nagar Haveli (UT), India;7. Department of Chemistry, S.N. Arts, D.J.M. Commerce and B.N.S. Science College, Sangamner 422 605, Savitribai Phule Pune University, Maharashtra, India;8. Department of Biotechnology, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur - 613401, Tamilnadu, India;9. Department of Chemical Engineering, Faculty of Technology, Dharmsinh Desai University, Nadiad-387001, Gujarat, India;10. Advanced Materials and Processes Research Institute, Hoshangabad Road, Bhopal 462026, India |
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| Abstract: | Stability of the various colloidal solutions containing CdS particles with the surface modified by thiols such as thioglycerol (TG-CdS), mercaptophenyltetrazole (MPT-CdS), mercaptobenzimidazole (MBI-CdS), and mercaptoacetate (MA-CdS) (capped CdS particles) under the stationary illumination was studied by monitoring the changes in the absorption spectra to obtain knowledge about the influence of these capping agents on photocatalytic events such as electron and hole transfer processes at the capped semiconductor particle-solution interface. By the stationary illumination of the capped CdS particles, the photo-aggregation of the particles was observed in water and the photo-dissolution in organic solvents. The observed difference may be ascribed to the oxidative elimination of the capping agents from the CdS particles which occurs assisted by proton dissociation from the agents in water but not in organic solvents with aprotic nature. Addition of iodide which is known as a hole scavenger enhanced the photo-dissolution of both the capped and ordinary non-capped CdS particles, contrary to the expected photo-aggregation. |
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