二氧化钛／竹炭复合材料的吸附－光催化降解苯酚的动力学研究

TiO2/bamboo charcoal composite was prepared by loading TiO2 into bamboo charcoal. The photo-catalytic activity of TiO2/bamboo charcoal composite was evaluated using phenol as a model substrate. The experimental results demonstrated that TiO2/bamboo charcoal composite had good adsorption capacity. The adsorption equilibrium constant (K(subscript a)) was 0.0077 L•mg^(-1), K(subscript e)ρ(subscript e) (ρ(subscript e) referred to equilibrium adsorption concentration of phenol) was from 0.25 to 1.35. It was found that the Langmuir-Hinshelwood model in its integral form in describing the fraction order kinetics of phenol photocatalytic degradation in the TiO2/bamboo charcoal composite were better than its simplified form as a first-order reaction model, since the significant substrate adsorption on the catalysts was not negligible, the corresponding photocatalytic degradation reaction equation was: lnρ-0.0077ρ=6.58-0.00239t (ρ referred to phenol concentration, and t referred to adsorption time).