ZnO/石墨烯与等离子体协同脱除空气中甲醛研究

Synergistic Removal of Formaldehyde from Air by ZnO/Graphene-Plasma

甲醛污染物对人体健康危害极大,研发高效去除空气中甲醛的方法至关重要。石墨烯具比表面积大、独特电学、光学等性质,作为催化剂载体优势显著。实验采用改良后的Hummers法、水热合成法制备出优质石墨烯和新型ZnO/石墨烯复合催化剂。分别将所制备的ZnO、石墨烯、ZnO/石墨烯催化剂与等离子体结合,进行甲醛脱除研究,得出ZnO/石墨烯与等离子体结合效果最佳。在甲醛初始浓度123×10-6、流量480 m L/min、温度40℃、放电电压1.8×104 V时甲醛脱除率96.1%,远大于相同条件下单纯等离子体脱除甲醛的脱除率和单纯ZnO/石墨烯催化剂催化氧化脱除甲醛的脱除率之和。实验结果表明,ZnO/石墨烯与等离子体结合在脱除空气中甲醛过程中产生了较好的协同作用。

Formaldehyde pollutant is very harmful to~ human health. It is very important to develop methods to remove of formaldehyde efficiently in the air. Graphene has advantages of large surface area, unique electrical and optical properties, as a catalyst carrier.In this experiment, a modified Hummers method and hydrothermal synthesis method were used to produce high quality graphene and a new ZnO/graphene composite catalyst. The preparation of ZnO, graphene, ZnO/graphene catalyst and plasma were combined, and formaldehyde removal was studied, and the results showed that the combination of ZnO/graphene and plasma was the best.In initial concentration of formaldehyde is 123×10-6, the flow rate of 480 mL/min, 40 ℃, 1.8×104 V lead .to the formaldehyde removal rate of 96.1%, over the same conditions in pure plasma removal of formaldehyde removal rate and the pure ZnO/graphene catalytic oxidation catalyst removal of formaldehyde removal rate of combined.The experimental results show that ZnO/graphene has a good synergistic effect on the removal of formaldehyde in the air.