非均相光催化技术处理废纸制浆废水的比较和优化

研究了不同非均相光催化工艺去除废纸制浆废水总有机碳（TOC）的效果，并对其进行比较和优化．结果表明，将均相和非均相光催化体系复合使用，可显著加快反应速度，提高处理效果在针铁矿、赤铁矿、TiO2分别与FeSO4复合催化的不同体系中，经30min光照后均可去除约57％的TOC．催化剂的晶体结构不同，光催化效果不同，3种催化剂的有效顺序为：针铁矿〉赤铁矿〉TiO2，与FeSO4复合后的顺序不变．针铁矿光催化反应和光解H2O2反应之间存在着很好的协同效应．非均相光催化反应可有效矿化小分子有机物，催化剂用量存在最佳饱和点，适当增加H2O2用量可有效提高处理效果．实验证明，光催化工艺可有效处理废纸制浆废水．

Comparison and Optimization of Different Heterogeneous Photo-Catalytic Oxidation Processes for Treating Wastepaper Pulp Effluents

The efficiencies of treatment of wastepaper pulp effluents by different heterogeneous photo-catalytic oxidation processes were studied with experiments, and their efficiencies were compared and optimized. In this study, it was proved that the efficiency of homogeneous-heterogeneous composite catalytic oxidation was better than those of homogeneous and heterogeneous catalytic oxidation. In all the three composite catalytic oxidation systems of FeSO4 with goethite, with hema- tite, and with TiO2, about 57% of total organic carbon （TOC） removal was obtained in just 30 min irradiation. Different crystal structures of catalyst led to different photo-catalytic oxidation efficiencies. As a result, the catalytic activity order of photo-catalytic oxidation systems for TOC removal was ： goethite 〉 hematite 〉 TiO2, and their composite catalytic oxidation systems with FeSO4 had the same order. The goethite and H2O2 have coordinated effect for degrading organic compounds. Heterogeneous photo-catalytic oxidation processes were very effective for mineralization of small molecule compounds. There exists a best saturation value for the catalyst dosage. Increasing dosage of H2O2 within the saturation value is an advantage of increasing the TOC removal. Experimental results indicate that the photo-catalytic oxidation process is very effective for treating wastepaper pulp effluents.