介质阻挡放电协同复合碳材料去除VOCs

挥发性有机物（VOCs）是常见的空气污染物，实验研究低温等离子体催化技术去除以甲苯为代表的VOCs。采用炭粉末、酚醛树脂和致孔有机高分子聚合物的有机溶剂混合物作为前驱物，经过炭化、水汽活化和负载锰催化剂，制备一种基于发泡金属的复合碳材料。采用扫描电子显微镜、XRD、全自动比表面积及微孔孔隙分析仪对材料进行表征。两段式介质阻挡放电反应器结合复合碳材料降解甲苯，前段介质阻挡放电初步降解甲苯，后段复合碳材料利用介质阻挡放电产生的长寿命活性物种和臭氧进一步去除甲苯。输入电压为10 kV时，甲苯去除率约99.4％，CO₂选择性达72.2%，并且有效控制了副产物臭氧。实验结果表明，复合碳材料有望应用于如臭氧和VOCs等的污染控制。

Removal of VOCs catalyzed by carbon composite material under assistance of dielectric barrier discharge

Removal of toluene, a typical volatile organic compounds(VOCs) by low-temperature plasma catalytic technique was studied. Carbon powder, phenolic resins, organic polymers and organic solvent were mixed as the precursor and a metal foam based carbon composite material was prepared via carbonization, steam activation and loading manganese catalyst. The composite material was characterized by scanning electron microscope(SEM), X-ray diffraction(XRD) and automatic surface area and micropore porosity analyzer. For degradation of toluene directly by dielectric barrier discharge plasma without presence of carbon composite material, the removal efficiency increased with increasing input voltage. Two-stage dielectric barrier discharge plasma reactor with carbon composite material was used for removal of toluene.Toluene was partially decomposed by high-energy particles generated in the dielectric barrier discharger in the first stage, and further degraded by combination of the long-life active species generated by the dielectric barrier discharge, ozone and mental foam carbon composite material. Toluene removal efficiency of 99.4% and selectivity to carbon dioxide of 72.2% were attained under input voltage of 10 kV, with effectively-controlled formation of ozone by-product.