中文摘要：

选用光催化／超滤耦合技术处理含偶氮染料直接耐酸大红4BS的模拟废水，测试了不同pH条件下悬浮态TiO2对4BS染料的等温吸附效果，TiO2用量以及4BS初始浓度对光催化降解效果的影响，确定了各个操作参数的最佳值，并进行了不同超滤膜回收光催化出水中TiO2的试验。结果表明，TiO2对4BS的吸附效果在pH为5．5时最好。根据初始反应速率的计算，得出在50mg·L^-1的4BS溶液中加入1g·L^-1TiO2的降解效果最佳，此时初始反应速率为3．13×10^-7mmol·L^-1·min，90min染料浓度去除率可达到99％以上。PAN700和PVDF700两种超滤膜对光催化出水TiO2回收率均为99％以上，但PAN700比PVDF700通量大，120min后通量仍可达214．0L·m^2·h^-1，具有很好的实际应用前景。

英文摘要：

Degradation of direct scarlet 4BS in dying wastewater by ultrafiltration coupling with photocatalysis Was studied. Photocatalytic process of the 4BS was firstly investigated on pH, the dose of catalyst TiO2 in solution and the initial concentration of 4BS to get their optimal values. Then different kinds ofultrafiltration （UF） membranes were used to remove the suspended nano-TiO2 particles in water. Results indicated that there was a maximal adsorption of dye on TiO2 at pH 5.5. The initial reaction rate was 3.128×10^-7 mmol·L^-1· min^-1 and the rejection of 4BS was over 99% after 90 min when dose of TiO2 was 1 g·L^-1 and the initial concentration is 50 mg ·L^-1. PAN700 and PVDF700 ultrafiltration membranes were installed in the UF separation units. The recycle rate of TiO2 was all over 99% for both membranes, and PAN700 showed a lager flux under the same pressure than PVDF700.