【摘要】 研究了2,4-二氯苯酚(DCP)光降解过程中pH的变化及其对DCP紫外-可见吸光度的影响。采用Na2CO3-NaHCO3和硼酸-硼砂两种弱碱性缓冲溶液体系消除了降解过程中pH变化的影响。与pH为3的酸性溶液体系对比表明,DCP在pH为9的缓冲溶液中具有较高的DCP去除率和催化效率,其中Na2CO3-NaHCO3体系光催化降解反应速率常数是酸性条件的2倍。更多还原

【Abstract】 2,4-dichlorophenol(DCP)is decomposed in the presence of TiO2 suspensions by illumination.The change of pH value in photocatalytic degradation of 2,4-dichlorophenol(DCP),and the effect of this change to UV-Vis absorbance spectrum of DCP have been investigated.Buffer solution with Na2CO3-NaHCO3 or boric acid-borax is used to eliminate this effect.It can be observed that removal efficiency of DCP is significantly higher at pH=9than that at pH=3,and the reaction rate is almost twice as fast as that at acidic environment.更多还原