title: Chemical absorption process for degradation of VOC gas using heterogeneous gas-liquid photocatalytic oxidation: toluene degradation by photo-Fenton reaction.
abstract: A novel process for degradation of toluene in the gas-phase using heterogeneous gas-liquid photocatalytic oxidation has been developed. The degradation of toluene gas by photo-Fenton reaction in the liquid-phase has experimentally examined. The photo-Fenton reaction in the liquid-phase could improve the overall toluene absorption rate by increasing the driving force for mass transfer and as a result enhance the removal of toluene in the exhaust gas. The toluene concentrations in the inlet gas were varied in the range from 0.0968 to 8.69 g m(-3) with initial hydrogen peroxide concentration of 400 mg l(-1) and Fe dose of 5.0 mg l(-1). It was found that toluene in the inlet gas was almost completely dissolved into water and degraded in the liquid-phase for the inlet toluene gas concentration of less than 0.42 g m(-3). The dynamic process of toluene gas degradation by the photo-Fenton reaction providing information for reaction kinetics and mass transfer rate was examined. Toluene removal kinetic analysis indicated that photo-Fenton degradation was significantly affected by H(2)O(2) concentration. The experimental results were satisfactorily described by the predictions simulated using the simplified tanks-in-series model combined with toluene removal kinetic analysis. The present results showed that the proposed chemical absorption process using the photo-Fenton heterogeneous gas-liquid photocatalytic oxidation is very effective for degradation of volatile organic gases.
authors.affiliation: Research Center for Biochemical and Environmental Engineering, Department of Applied Chemistry, Toyo University, Kawagoe, Saitama 350-8585, Japan.
authors.forename: Masahiro
authors.initials: M
authors.lastname: Tokumura
authors.forename: Rina
authors.initials: R
authors.lastname: Nakajima
authors.forename: Hussein Tawfeek
authors.initials: HT
authors.lastname: Znad
authors.forename: Yoshinori
authors.initials: Y
authors.lastname: Kawase
mesh_terms: D000042:Absorption; D002384:Catalysis; D006861:Hydrogen Peroxide / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D010084:Oxidation-Reduction; D044367:Phase Transition; D010777:Photochemistry; D014050:Toluene / Q000737:chemistry*; D014835:Volatilization; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: C045076:Fenton's reagent; D014050:Toluene; D006861:Hydrogen Peroxide; D007501:Iron