Study On Adsorption And Photocatalytic Degradation Of Bamboo Charcoal-TiO₂ Composites For Phenol

In this thesis, adsorption of bamboo charcoal (BC) and photocatalytic oxidation of TiO₂ were combined to treat phenol in water. The performance of adsorption of bamboo charcoal for phenol in water solution and some influencing factors were investigated; the removal capability of the physical combination of bamboo charcoal and TiO₂ for phenol was studied, and the relevant influencing factors were discussed. In addition, TiO₂ and TiO₂/BC composites prepared by sol-gel method were studied, and the optimum preparation conditions were described. Further more, the adsorption and photocatalytic activity of TiO₂/BC for phenol were studied in order to develop a kind of TiO₂/BC composites with both good adsorption and favorable photocatalytic degradation. The results show that:(1) Bamboo charcoal possesses favorable adsorption ability for phenol. The adsorption isotherm of phenol tallies with the isothermal adsorption equations of Langmuir and Freundlich. (2) Under aeration condition, bamboo charcoal, TiO₂ and light cooperate with each other to remove phenol, consequently the removal rate is increased. (3) The optimum conditions for preparing TiO₂ are as follows, pH value=1, n(C₂H₅OH)/n(TiBuO₄)=15, n(H₂O)/n(TiBuO₄)=3, calefactive speed 10℃/min, sinter temperature 450℃. (4) The adsorption efficiency of TiO₂/BC is better than that of singlehanded bamboo charcoal, and TiO₂/BC possesses photocatalytic activity. The effects of TiO₂/BC for removing phenol at different concentrations are all preferable in the experiment.