为了更有效地回收挥发性有机化合物(VOCs)中的苯系物,并满足日趋严格的VOCs排放标准,开发了一种用于吸附回收苯的新型吸附材料。对原料硅胶进行表面化学改性,在硅胶表面接枝,形成络合π键的苯官能团。通过正交试验分析,以疏水指数和静态苯蒸汽吸附量为评价指标,确定了两种改性疏水硅胶的合成配方。对改性疏水硅胶进行苯吸附等温线、表面官能团表征及吸脱附性能的测定,研究对比了改性疏水硅胶与原料硅胶、以及现场在用活性炭对苯的吸附性能。结果表明:改性疏水硅胶对苯蒸汽的吸附量比活性炭更大,且可重复使用。
In order to recover benzene series from VOCs more effectively and satisfy increasingly stringent VOCs discharge standard,a new type of adsorption material for benzene adsorption and recovery was developed.The silica was chemically modified and the functional groups was grafted onto the surface of silica which can form the π-complexation with benzene molecular.By orthogonal test,the hydrophobic index and static benzene vapor adsorption capacity were taken as evaluation indexes to determine the synthesis formula of two modified hydrophobic silica.The benzene adsorption isotherms,surface functional groups and adsorption desorption properties of the silica were determined.Adsorption properties of benzene on silica and activated carbon were compared.The results shown that the adsorption capacity of the silica for benzene vapor was higher than the activated carbon,and it can be reused.
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基金资助
中国石化科技部项目(316049)
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