Ce-ZnO/AC在真空紫外下催化降解对二甲苯废气

将Ce掺杂ZnO光催化剂通过负载活性炭 (AC)的方式制备Ce-ZnO/AC吸附-催化复合材料，并以对二甲苯为典型挥发性有机污染物(VOC)，研究其在真空紫外体系中光催化转化性能。结果表明：活性炭的负载能有效提高臭氧的利用效率，强化对二甲苯的去除率和矿化率；当Ce-ZnO与活性炭的负载比例为1∶2时，复合材料的光催化性能达到最优，此时对二甲苯的转化率达到95%以上；活性炭的负载不仅可使污染物与催化剂充分接触，还可有效利用臭氧从而产生·OH等自由基，协同促进对二甲苯的降解，同时更多的中间产物被降解。复合催化材料显示了良好的稳定性，在利用5次后，仍可再生恢复其光催化性能至初始状态。相对于单独的真空紫外光解，Ce-ZnO/AC吸附-催化复合材料与真空紫外体系耦合降解二甲苯的能量利用率提高了2倍，经济性好。

Catalytic degradation of p-xylene waste gas by Ce-ZnO/AC under vacuum ultraviolet irradiation

An adsorption-catalytic composite catalyst Ce-ZnO/AC was prepared by loading of activated carbon (AC) on Ce-doped ZnO photocatalyst. The photocatalytic degradation experiments were carried out using p-xylene as a model volatile organic compound (VOC) in photocatalytic reactor, and the photocatalytic and conversion of p-xylene in vacuum ultraviolet irradiation environment was studied. The results showed that the loading of activated carbon could increase the ozone utilization efficiency, and enhance the removal rate and mineralization rate of p-xylene. The composite catalyst achieved the best effect when the ratio of Ce doped ZnO to activated carbon was 1∶2, and the conversion rate of p-xylene reached over 95%. The loading of activated carbon not only promoted the contact between pollutants and the catalyst, but also effectively utilized the ozone to generate free radicals such as ·OH, which could synergistically promote the degradation of p-xylene and more intermediates compared to the catalytic without active carbon. The composite catalyst also showed good stability and could be regenerated and recovered its initial adsorption-catalytic performance after five cycles. The energy efficiency of composite catalyst increased by double compared to VUV alone, and it had good economic effect.