【摘要】 通过将Cu改性悬浮型光催化氧化过程与纳滤分离膜技术进行耦合构成悬浮型光催化纳滤膜反应器联合处理阿特拉津(Atrazine)溶液.在Atrazine初始浓度ρ0分别为5,15和25mg·l-1,光催化剂浓度ρTiO2为1500mg·l-1,废水pH值为5.5,UV强度为45mW.cm-2,膜分离压力和错流流速分别控制在1250kPa和3m.s-1,反应温度20±1℃的最佳实验条件下,35min之内目标污染物基本被彻底光催化降解,矿化率达到90%以上,出现显著耦合效应;当目标污染物浓度分别为5mg·l-1,15mg·l-1和25mg·l-1时,在ρ/ρ0≥0.6的范围内,光催化降解过程分别遵循一级、零级和一级的混合以及零级反应动力学模型.更多还原

【Abstract】 The investigation on photocatalytic degradation of suspended photocatalytic nanofiltration membrane reactor for simulated Atrazine wastewater with Cu-modified nano-photocatalyst synthesized in the paper.Under the optimized operation conditions of photocatalyst concentration of 1500mg·l-1,pH 5.5,UV irradiation intensity of 45mV·cm-2 and various substrate initial concentrations of 5,15 and 25mg·l-1,coupled with the transmembrane pressure and cross-flow velocity of 1250kPa and 3m·s-1 respectively, the photocataytic degradation and transformation efficiency of model pollutant Atrazine is nearly 100%, and the total organic carbon removal efficiency is more than 90% with a significantly and obviously synergetic effect after irradiation time of 35 min, promising the successfully and completely photocatalytic mineralization of simulated Atrazine wastewater for the first time. Moreover, it has to be pointed out that the photocatalytic reaction kinetics had been observed to change with the initial Atrazine concentration in the photoreactor, one-order kinetics model, combination of one-order and zero-order kinetics model, and zero-order kinetics model have been observed to be obeyed when the initial substrate concentration is 5,15 and 25mg·l-1 individually, within the ratio of remaining concentrations of the substrate to the initial ones larger than 0.6.更多还原