title: Macro kinetic studies for photocatalytic degradation of benzoic acid in immobilized systems.
abstract: Semiconductor photocatalytic process has been studied extensively in recent years due to its intriguing advantages in environmental remediation. In this study, a two-phase swirl-flow monolithic-type reactor is used to study the kinetics of photocatalytic degradation of benzoic acid in immobilized systems. Transport contributions into the observed degradation rates were determined when catalyst is immobilized. Intrinsic kinetic rate constants and its dependence on light intensity and catalyst layer thickness, values of adsorption equilibrium constant, internal as well as external mass transfer parameters were determined. The simultaneous effect of catalyst loading and light intensity and optimum catalyst layer thickness were also determined experimentally. Reaction rate constants and overall observed degradation rates were compared with slurry systems.
authors.affiliation: Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore.
authors.forename: Kanheya
authors.initials: K
authors.lastname: Mehrotra
authors.forename: Gregory S
authors.initials: GS
authors.lastname: Yablonsky
authors.forename: Ajay K
authors.initials: AK
authors.lastname: Ray
mesh_terms: D000327:Adsorption; D019817:Benzoic Acid / Q000737:chemistry* / Q000528:radiation effects*; D002384:Catalysis; D005898:Glass; D007700:Kinetics; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D014874:Water Pollutants, Chemical / Q000528:radiation effects; D018508:Water Purification / Q000379:methods*
chemical_list: D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D019817:Benzoic Acid; D014025:Titanium