活性炭液相吸附脱除二甲基二硫醚

摘要

Activated carbons of coconut shell were tested as adsorbents of removing dimethyl disulfide and the effects of surface chemistry and pore structure on the adsorptions were investigated.Chemical hardness was computed to interpret the effect of surface chemistry on the adsorptions by Hard and Soft Acids and Bases（HSAB） theory.Moreover the thermodynamic property of the adsorptions was studied.The results show that the number of acid oxygen functional groups has little influence on the adsorptions due to the similar chemical hardness among compounds in sulfate turpentine.However specific surface area and pore volume have great impact on the adsorption.The adsorption isotherms of dimethyl disulfide on the activated carbons fit the Freundlich model and equation satisfactorily.And the result of adsorption thermodynamics shows that the adsorption of dimethyl disulfide on activated carbon is an exothermic,low-disordered and spontaneous process.%通过椰壳活性炭对模拟硫酸盐松节油进行液相吸附脱硫的研究,考察了活性炭的结构和表面化学对活性炭吸附的影响。通过Gaussian03计算模拟油中各化合物的化学硬度,根据软硬酸碱理论解释表面化学对该吸附过程的影响。同时考察了活性炭吸附过程的热力学性质。结果表明,由于吸附体系中的二甲基二硫醚和莰烯的化学硬度相接近,活性炭表面的含氧官能团的变化对吸附性能影响不大,但活性炭比表面积和孔结构的变化对吸附性能的影响较为明显;等温吸附平衡数据符合Freundlich等温吸附模型,热力学数据显示该活性炭吸附过程是一个放热、混乱度降低的自发物理吸附过程。