负载Cu改性活性炭吸附VOCs性能的研究

ADSORPTION OF VOCs ON MODIFIED ACTIVATED CARBON BY SUPPORTED Cu

采用浸渍焙烧法对活性炭进行铜负载改性,并用于甲苯、乙酸乙酯及甲苯-乙酸乙酯二元混合气体的吸附。结果表明:醋酸铜负载量1.5%时活性炭吸附性能最好,对于单组分气体吸附,改性活性炭对甲苯和乙酸乙酯的吸附量较未改性前分别提高了29.7%和21.3%,穿透时间分别延迟了19.3%、18.6%;对于二元混合气体吸附,改性后活性炭较未改性活性炭对甲苯和乙酸乙酯的吸附量分别提高了19.4%和33.0%。采用BET、SEM、FTIR、XRD等分析表明,铜负载改性后的活性炭比表面积变大、总孔容变大,且铜与VOC的络合作用是改性后吸附量提高的主要原因。

Activated carbon was modified with loading copper by roasting-impregnated method. The dynamic adsorption of single component( toluene or ethyl acetate) and bicomponent( toluene and ethyl acetate) on the modified activated carbon were investigated. The results showed that the best adsorption performance was observed with AC2. Concretely,for the single component system,the adsorption capacity on the AC2 compared to the unmodified one,increased 29. 7% for toluene and21. 3% for ethyl acetate, respectively. Meanwhile,the breakthrough time were also delayed by 19. 3% and 18. 6%,respectively. The same trend that the adsorption capacity increased on the modified activated carbon,was also found on bicomponent adsorption increased 19. 4% for toluene and 33. 0% for ethyl acetate. The analysis of BET,SEM,FTIR and XRD indicated that the surface area and total pore volum increases of activated carbon modified by copper, and the complexation of copper and VOC was the main reason.