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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β=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.
The effect of super-gravity on phenol desorption performance and the kinetics of desorption on activated carbon were studied and compared with the traditional desorption method. The results showed that under the conditions of normal temperature, atmospheric pressure, hypergravity factor β = 55.14, liquid flow rate 40 L / h, the concentration of lye was 0.5 mol / L, the adsorption time was 90 min, the phenol removal rate was 93.01%, which was 3.88 times higher than the traditional desorption method under similar conditions. Fitting the experimental data, the rate constant of desorption was increased from 13.66 × 10-4 under the similar conditions to 29.59 × 10-4 under the super-gravity condition, indicating that the super-gravity enhanced the liquid-solid mass transfer. Desorption favorable; two methods to lye as desorbent desorption properties are better than distilled water as desorbent.