苯酚和吡啶在竹质活性炭上的吸附研究  

Adsorption features of phenol and pyridine on the activated bamboo charcoal

作　　者：俞蓉[1] 刘江江[2] 陈吕军[2] 温东辉[1] 何玉山[1] 

机构地区：[1]北京大学环境科学与工程学院,北京100871 [2]清华大学环境科学与工程系,北京100084

出　　处：《安全与环境学报》2007年第5期8-11,共4页Journal of Safety and Environment

基　　金：北京市自然科学基金项目(8073028)

摘　　要：以焦化废水中的代表性污染物苯酚和吡啶为吸附质,以颗粒竹质活性炭为吸附剂,考察了苯酚和吡啶在竹质活性炭上的吸附性能以及两种化合物之间的竞争吸附关系。结果发现:竹质活性炭对苯酚的吸附较符合Langmuir等温式,对吡啶的吸附较符合Freundlich等温式,苯酚和吡啶的最大吸附量分别为122.0mg/g和344.8mg/g。该竹质活性炭对苯酚和吡啶的吸附符合拟二级动力学方程,吸附均在4.0h时达到平衡,当两种化合物共存于溶液中时,其吸附动力学过程和吸附平衡时间未受影响,但竞争吸附导致苯酚和吡啶的平衡吸附量分别下降了10.4%和20.8%。This paper is aimed at presenting the experimental results of the adsorption features of phenol and pyridine on the activated bamboo charcoal （ABC） at the temperature of 35 ℃ . Taking phenol as the typical compound from the phenolic group, pyridine as that from the nitrogen heterocyclic aromatic group, and the ABC with its diameter of 4 - 6 mm made out of phyllostachys pubescens in Zhejiang Province as the adsorbent, we have carefully observed and measured the competitive adsorption relation of the said compounds in our work. The results of our experimental research have shown that the adsorption of phenol is fit both for the Langmuir and the Freundlich model whereas that of pyridine is only fit for the Freundlich. The maximum adsorption capacities of phenol and pyridine are 122.0 mg/g and 344.8 mg/g respectively with each of the results tested and measured by the Langmuir model. Through the kinetics experiments, the adsorption both of the compounds prove to have reached their equilibrium in 4.0 h, with 70.4 % and 72.7 % for each of the final adsorption to take place during the first hour of the process. Furthermore, the two adsorption processes prove to conform to the pseudosecond order kinetic model. In addition, it has been found that when the two compounds co-exist in the same solution, the kinetic process, the moment for the two compounds to reach equilibration and the adsorption rate constants prove not to be affected by each other, but their adsorption capacities tend to get lower. By the end of the kinetic experiment （5.8 h）, in the single solution systems, the adsorption capacity could be 67.0 mg/g for phenol with its initial concentration of 264.2 mg/L, and 91.0 mg/g for pyridine with its initial concentration of 433.7 mg/L; while in the hi-solution system with the same initial concentrations, the adsorption capacities can be expected to reach 60.0 mg/g and 72.1 mg/g for phenol and pyridine, respectively, and then began to drop down by 10.4% and 20.8% respectively. This implies that phenol may

关 键 词：环境科学 竹质活性炭 竞争吸附 苯酚 吡啶 

分 类 号：X703.1[环境科学与工程—环境工程]