Investigation on UV-A light photocatalytic degradation of an azo dye in the presence of CdO/TiO2 coupled semiconductor. (July 2015)

• Record Type: Journal Article
• Authors: Dhatshanamurthi, P.; Subash, B.; Shanthi, M.
• Is Part Of: Materials science in semiconductor processing. Volume 35(2015:Jul.)
• Page Start: 22
• Page End: 29
• Publication Date: 2015-07
• Subjects: CdO/TiO2 -- Photocatalysis -- UV-A light -- Reactive Orange 4 -- Reusability; Semiconductors -- Periodicals; Integrated circuits -- Materials -- Periodicals; Semiconducteurs -- Périodiques; Circuits intégrés -- Matériaux -- Périodiques; Electronic journals; 621.38152
• DOI: 10.1016/j.mssp.2015.02.069
• Languages: English
• ISSNs: 1369-8001

Abstract

Abstract: CdO/TiO2 composites were prepared by sonochemically assisted sol–gel method. Initially, CdO was prepared by precipitation-thermal decomposition method and used for composites preparation. The prepared catalysts were used for the degradation of an azo dye, Reactive Orange 4 (RO 4) under UV-A light. 5 wt% CdO/TiO2 composite was found to be very efficient towards RO 4 degradation, this catalyst was characterized by different characterization techniques (XRD, SEM, EDS, TEM, PL and BET surface area measurements) besides bare TiO2 was also characterized for comparison. 5 wt% CdO/TiO2 showed the best photocatalytic activity in the degradation of RO 4 compared with the bare TiO2, TiO2 -P25 and CdO. The effects of operational parameters such as the amount of photocatalyst, initial pH and dye concentration have been analyzed. The mineralization of RO 4 has been confirmed by chemical oxygen demand (COD) measurements. A mechanism has been proposed for the degradation of RO 4 under UV-A light. This catalyst is found to be more stable and reusable.