多微孔活性炭的制备及对二甲苯的吸附研究

研究了以木质活性炭颗粒为原料, 通过KOH再活化的方法制备多微孔活性炭的方法。考察了活性炭和KOH的最佳质量比例, 并通过低温氮吸附、SEM、XRD等手段表征了样品的比表面、孔结构、孔分布、颗粒形貌和晶体结构;通过对含间二甲苯50 mg·L^-1的气流的吸附实验表征了所制备活性炭的二甲苯去除能力, 实验结果表明, 经过KOH再活化显著调高了样品的间二甲苯吸附容量, 这很可能和样品中发达的微孔结构有关。

Preparation of Active Carbon with more Micropores and Investigation on Its Xylene-Adsorbing Ability

Active carbons with more micropores were prepared with wooden active carbon particles and KOH used as raw material and active agent respectively. The optimized weight ratio between wooden active carbon and KOH was obtained. The low-temperature N2 adsorption, SEM and XRD methods were employed to investigate the specific surface area, pore-structure, pore size distribution, morphology of particle surface and crystal structure of the as-made samples. The xylene-removal abilities of the samples were assessed with adsorbing experiments on gas streams containing 1,3-xylene (50 mg·L^-1). It was revealed by the results that re-active operation with KOH upon the wooden active carbon obviously enlarge the 1,3-xylene adsorption capacity of the samples which might be resulted by the newly formed micro-pores.