海藻酸钠磁球制备及对亚甲基蓝的吸附研究

Preparation of Sodium Alginate Magnetic Balls and Adsorption for Methylene Blue

首先以FeCl_(3)·6H_(2)O、FeCl_(2)·4H_(2)O与NaOH为原料制备磁流体Fe_(3)O_(4),然后以十二烷基苯磺酸钠(LAS)和海藻酸钠(SA)包裹磁流体,以CaCl_(2)为交联剂制备交联海藻酸钠磁球.将该磁球用于吸附溶液中的亚甲基蓝,考察相关因素对吸附的影响.结果显示,25℃,亚甲基蓝溶液质量浓度140 mg/L,吸附时间240 min时达到吸附平衡,吸附量为992.9 mg/g,去除率研究发现磁球用量55 mg时去除率达到92.2%;并且吸附过程为放热过程,温度上升,吸附量下降;当溶液pH介于6~9时磁球吸附量基本保持不变.吸附动力学模拟表明,吸附过程更符合Lagergren准一级动力学模型,吸附等温模拟显示与Freundlich方程有很好的拟合度.

FeCl_(3)·6H_(2)O,FeCl_(2)·4H_(2)O and NaOH were used as raw materials to prepare magnetic fluid Fe_(3)O_(4),and then sodium dodecyl benzene sulfonate(LAS)modified sodium alginate(SA)magnetic sphere was prepared.The methylene blue in the solution was adsorbed by static adsorption method,and the influence of relevant factors on the adsorption amount was investigated.The results showed that the adsorption of methylene blue by Sodium alginate magnetic sphere was at room temperature,the concentration of methylene blue was 140 mg/L,and the adsorption time was 240 min.The maximum adsorption capacity was 992.9 mg/g.Adsorption kinetics studies show that the adsorption process is better consistent with the Lagergren quasi-first-order kinetic model.The experimental data has a good fit to the Freundlich equation.