花生壳活性炭对水溶液中活性艳兰染料的吸附

Adsorption of Reactive Brilliant Blue from Aqueous Solution by Peanut Hull Activated Carbon

采用花生壳为原料,用磷酸活化后,在400℃对活化花生壳进行炭化,制得花生壳活性炭,用于吸附水溶液中的活性艳兰染料.实验考察了pH值、吸附时间和吸附质初始浓度对活性艳兰吸附的影响.结果表明,对于初始浓度为100 mg/L的活性艳兰染料,在90 min就可达到吸附平衡.花生壳活性炭对活性艳兰的吸附过程符合Freundlich吸附等温式和准二级动力学模型.室温下,花生壳活性炭对活性艳兰的最大吸附量为482.8 mg/g.计算了热力学参数(△H、△G、△S),说明该吸附过程为自发过程.花生壳活性炭对水溶液中活性艳兰有较好的吸附性能.

Activated carbon prepared from peanut hull using phosphate as an activator at 400 ℃was utilized as adsorbent to remove reactive brilliant blue from aqueous solution. Batch experiments were conducted to study the effects of pH, adsorption time, and initial concentration of adsorbate on reactive brilliant blue adsorption. The results show that the adsorption equilibrium of peanut hull activated carbon reached within 90 min for reactive brilliant blue concentrations of 100 mg/L. The equilibrium data in aqueous solutions were well represented by the Freundlich models. The pseudo-second order equation provided the better correlation of the used experimental data. The adsorption capacity of reactive brilliant blue onto peanut hull activated carbon found to be as high as 482.8 mg/g. The thermodynamic constants of the adsorption process /k H, A G and A S were evaluated. These show that adsorption of reactive brilliant blue on peanut hull activated carbon was spontaneous. The peanut hull activated carbon was found to be very effective as adsorbent for reactive brilliant blue from aqueous solution.