黏胶基活性碳纤维吸附吡啶

Adsorption characteristics of pyridine on rayon-based activated carbon fiber

采用黏胶基活性碳纤维(rayon-based ACF)吸附焦化尾水中的典型有机物吡啶,考察了在不同时间、投加量、温度以及有机物影响的条件下,黏胶基活性碳纤维对吡啶的静态吸附效果。从动力学、热力学和分子结构等方面来判断吸附类型,并从理论上分析黏胶基活性碳纤维对模拟焦化尾水典型有机污染物的吸附过程。实验结果表明,当吡啶废水的初始浓度为25mg/L时,黏胶基活性碳纤维对吡啶的吸附在60min基本达到平衡,最大吸附量为17.66mg/g;随着温度的升高,吸附效率下降;共存有机物喹啉会抑制吡啶的吸附效率,使黏胶基活性碳纤维对吡啶的吸附率显著降低;活性碳纤维吸附吡啶的过程符合Lagergren准二级动力学模型,其相关系数>0.999,在22℃的液相温度下,吸附等温式为q=2.3138ce0.9540。热力学参数ΔH0、ΔG0均为负值,表明该吸附是一个自发的放热过程。

This article studied the static adsorption of pyridine and quinoline on rayon-based activated carbon fiber（rayon-based ACF）,investigated the influencing factors of adsorption efficiency and behaviors such as time,dose,temperature and organic compound,and analyzed the adsorption type and process of typical organic pollutants of coking water from the aspects of kinetic,thermodynamic and molecular structure. The results showed that when the initial concentration of pyridine wastewater was 25mg/L,the maximum adsorption capacity was 17.66mg/g and it took about 60 min to reach the adsorption equilibrium. Adsorption efficiency decreased with increasing temperature. The presence of quinoline inhibited the adsorption efficiency of pyridine,and the adsorption rate of pyridine was significantly decreased. Pyridine adsorption processes of carbon fiber agreed with pseudo second-order kinetic model with the correlation coefficient of 0.9999. Freundlich isotherm of pyridine adsorption on the ACF at liquid temperature of 22℃ was q=2.3138ce0.9540. ΔG0 and ΔH0 were both negative,indicating spontaneous and exothermic adsorption.