title: Solar degradation of diclofenac using Eosin-Y-activated TiO2: cost estimation, process optimization and parameter interaction study.
abstract: 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 TiO2using 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/cm2), Eosin-Y dye concentration (2 mg/L), TiO2loading (37.5 mg/cm2) 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.
authors.affiliation: a Department of Chemical and Biochemical Engineering , University of Western Ontario , London , Canada.
authors.forename: Noshin
authors.initials: N
authors.lastname: Hashim
authors.affiliation: a Department of Chemical and Biochemical Engineering , University of Western Ontario , London , Canada.
authors.forename: Shaila
authors.initials: S
authors.lastname: Thakur
authors.affiliation: a Department of Chemical and Biochemical Engineering , University of Western Ontario , London , Canada.
authors.forename: Mouska
authors.initials: M
authors.lastname: Patang
authors.affiliation: a Department of Chemical and Biochemical Engineering , University of Western Ontario , London , Canada.
authors.forename: Ferdinando
authors.initials: F
authors.lastname: Crapulli
authors.affiliation: a Department of Chemical and Biochemical Engineering , University of Western Ontario , London , Canada.
authors.forename: Ajay K
authors.initials: AK
authors.lastname: Ray
mesh_terms: D000704:Analysis of Variance; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry; D001673:Biodegradation, Environmental; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry; D004008:Diclofenac / Q000737:chemistry*; D004801:Eosine Yellowish-(YS) / Q000737:chemistry*; D005618:Fresh Water / Q000737:chemistry; D008027:Light; D010100:Oxygen / Q000737:chemistry; D012044:Regression Analysis; D012984:Software; D013472:Sunlight; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry; D018508:Water Purification / Q000379:methods
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D004396:Coloring Agents; D014874:Water Pollutants, Chemical; D004008:Diclofenac; C009495:titanium dioxide; D014025:Titanium; D010100:Oxygen; D004801:Eosine Yellowish-(YS)
keywords: AOP; Eosin-Y; Solar visible photocatalysis; TiO2; diclofenac; dye sensitization; water treatment