Solar degradation of diclofenac using Eosin-Y-activated TiO2: cost estimation, process optimization and parameter interaction study

• Published in: Environmental technology Vol. 38; no. 8; pp. 933 - 944
• Main Authors: Hashim, Noshin, Thakur, Shaila, Patang, Mouska, Crapulli, Ferdinando, Ray, Ajay K.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 18-04-2017; Taylor & Francis Ltd
• Subjects: AOP; diclofenac; dye sensitization; Eosin-Y; Optimization; Solar visible photocatalysis; TiO; water treatment
• ISSN: 0959-3330; 1479-487X
• DOI: 10.1080/09593330.2016.1214625

Diclofenac (DCF), a widely used non-steroidal anti-inflammatory drug, is a commonly detected substance that readily accumulates in tissues of aquatic fish and poses a threat to wildlife and freshwater quality. Advanced Oxidation Processes have been employed as an alternative due to the inadequacy of conventional treatment methods of trace contaminants. This study utilized an innovative method of solar-activation of TiO
2
using Eosin-Y dye for the degradation of DCF. Furthermore, the study incorporated a central composite design (CCD) to optimize the dye concentration and estimated the cost for the present process. Optimized parameters for light intensity (750 mW/cm
2
), Eosin-Y dye concentration (2 mg/L), TiO
2
loading (37.5 mg/cm
2
) and DCF concentration (25 mg/L) were determined through a CCD. The optimized parameters convey a DCF degradation rate of 40% and 49% for 2 ppm (low range) and 4 ppm (high range) dye concentrations, respectively, for a 5-minute reaction time. Cost estimation for the materials used was for the current process was also performed. It was determined that the additional cost of using 4 ppm instead of 2 ppm to achieve only 10% more DCF degradation is not warranted and would require additional treatment to remove subsequently formed halogenated compounds.