摘要
近10多年来，各国对饮水氯化处理中的副作用研究甚多．现已发现氯化饮水中含有不同性质的有机物约300种“’，其中三卤甲烷含量突出，而活性炭吸附是脱除其中不同性质有机物的有效方法’‘－‘’．一般情况下，溶质在吸附剂内的扩散过程是整个吸附过程的控制步骤．但目前文献仅限干研究活性炭吸附三卤甲烷的能力，很少涉及与吸附速率有关的有效扩散系数．
Batch adsorption experiments were carried out at 25℃ using activated carbon to adsorb chloroform from water. This system was found to obey the Langmuir isotherm numerically computed bulk concentration time change for the surface diffusion model and that by the pore diffusion model were both in reasonable agreement with the measured data. The effective pore diffusivity was found to be almost independent of the initial chloroform concentration, while the effective surface diffusivity increased with the increase in the initial concentration, Both the resistance of particle - fluid mass transfer and intraparticle mass transfer should be considered for adsorption in liquid.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1994年第4期499-504,共6页
CIESC Journal
关键词
三氯甲烷
吸附
活性炭
扩散模型
chloroform, adsorption, activated carbon, diffusion model
