活性炭纤维对活性染料的吸附动力学研究

Adsorption Kinetics of Reactive Dyes on Activated Carbon Fiber

研究了活性炭纤维从水溶液中吸附4种活性染料(活性艳红K-2BP、活性翠蓝KN-G、活性金黄K-3RP、活性黑KN-B)的吸附特性,从动力学角度探讨了吸附机理.结果表明,活性炭纤维对4种染料的平衡吸附量qe均随着初始浓度和温度的增加而升高,相同条件下,qe的大小顺序为:活性艳红>活性金黄>活性黑>活性翠蓝.吸附过程符合伪二级吸附速率方程,染料分子的空间结构、大小和极性是影响初始吸附速率的主要因素.活性炭纤维对4种染料的吸附活化能都比较低,依次为16.42、3.56、5.21和26.38 kJ.mol-1,说明吸附过程以物理吸附为主.

The adsorption capability of activated carbon fiber （ACF） to four reactive dyes （reactive brilliant red K-2BP, reactive turquoise blue KN-G, reactive golden yellow K-3RP, reactive black KN-B） in aqueous solution was studied, and adsorption mechanism was focused on from kinetics point of view. The results show that the equilibrium adsorbing capacity （ qe） of each dye increases with the addition of initial concentration or temperature. On the same condition, the order of qe is： reactive brilliant red 〉 reactive golden yellow 〉 reactive black 〉 reactive turquoise blue. The adsorption processes follow a pseudo second-order kinetic rate equation, and the steric structure, size and polarity of dyes are important influence factors to initial adsorption rate. The adsorption activation energy of each dye is low （16.42, 3.56, 5.21, 26.38 kJ·mol^-1 respectively）, which indicates that it belongs to physics adsorption.