研究了超重力对活性炭上苯酚脱附性能的影响及脱附动力学,并与传统脱附法进行了对比. 结果表明,在常温、常压、超重力因子??55.14、液体流率为40 L/h、碱液浓度为0.5 mol/L、吸附时间为90 min的条件下,苯酚脱除率达93.01%,较相近条件下传统脱附法提高了3.88倍;采用拟二级动力学模型对实验数据进行拟合,脱附速率常数由较相近条件下传统脱附法的13.66?10?4提高到超重力条件下的29.59?10?4,表明超重力强化了液固传质,对脱附有利;两种方法中以碱液为脱附剂的脱附性能均优于蒸馏水为脱附剂.
We investigated the desorption of phenol from activated carbon with high gravity technology and the desorption kinetics, compared the results with that of the traditional desorption method. Under the optimal conditions, high gravity factor of 55.14, flow rate of 40 L/h, concentration of NaOH of 0.5 mol/L, the desorption time of 90 min, the phenol desorption efficiency was reached up to 93.01%, 3.88 times higher than that of the traditional desorption method under the same conditions. The pseudo-second-order model was used to study the desorption kinetics. The desorption rate constant improved from 13.66?10?4 to 29.59?10?4 compared with the traditional desorption method. The results showed that the mass transfer between liquid and solid was intensified by high gravity technology, which do favor to desorption process. Moreover, the desorption efficiency by NaOH solution was higher than that of deionized water under two methods.