title: Effect of surface area enhancement on the adsorption of Bovine Serum Albumin onto titanium dioxide.
abstract: The equilibrium and the kinetics of BSA adsorption onto specific surface area changed TiO(2) by heat treatment were studied. The TiO(2) was treated at 100 and 200 degrees C for 24h. The specific surface areas of TiO(2) characterized by BET method were measured as 48.9m(2)/g and 53.0m(2)/g for 100 and 200 degrees C, respectively. The adsorption rate and the equilibrium experiments were carried out at pH 4 for 40 degrees C. The rate kinetics for the adsorption of BSA was best fitted with the pseudo-first-order kinetic model. The equilibrium process was described by the Langmuir and Freundlich isotherm models. The adsorption capacities (Q(0)) calculated from the Langmuir isotherm model were 40.6 and 44.4mg/g for heat-treated TiO(2) at 100 and 200 degrees C, respectively. The adsorption of BSA increased with increasing surface area of TiO(2). The zeta potential values of the 100- and 200 degrees C-treated TiO(2) were found as -2.57mV and 0.39mV, respectively, showing that the interaction between TiO(2) with BSA increased with increasing temperature of heat treatment for TiO(2).
authors.affiliation: Department of Chemistry, Zonguldak Karaelmas University, Zonguldak, Turkey. turkankopac@yahoo.com
authors.forename: Turkan
authors.initials: T
authors.lastname: Kopac
authors.forename: Kadriye
authors.initials: K
authors.lastname: Bozgeyik
mesh_terms: D000327:Adsorption; D000818:Animals; D002417:Cattle; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D012710:Serum Albumin, Bovine / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature; D014025:Titanium / Q000737:chemistry*
chemical_list: C009495:titanium dioxide; D012710:Serum Albumin, Bovine; D014025:Titanium