【摘要】 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30 min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.更多还原

【Abstract】 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 studyi,t 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 advan-tage of increasing the TOC removal.Experimental results indicate that the photo-catalytic oxidation process is very effective for treating wastepaper pulp effluents.更多还原