海藻酸钠/氧化石墨烯小球的制备及吸附性能研究

Preparation of Sodium Alginate/Graphene Oxide Pellet and Study of Adsorption Properties of Sodium Alginate/Graphene Oxide Pellet

制备了海藻酸钠/氧化石墨烯小球,以亚甲基蓝为被吸附药物代表,研究新制备小球的吸附性能。考察了不同条件(如吸附时间、初始pH、小球加入量和初始浓度)下,海藻酸钠/氧化石墨烯小球对亚甲基蓝的吸附能力。结果表明,吸附量随小球加入量和初始浓度等增大而升高。海藻酸钠/氧化石墨烯小球对亚甲基蓝的吸附过程较好的符合Langmuir模型。pH值对吸附效果影响不大。pH为6时的最大吸附量为157.73mg/g。在20℃下,对亚甲基蓝的吸附在6h左右达到平衡,准二级动力学模型比准一级动力学模型能更好地描述海藻酸钠/氧化石墨烯小球对亚甲基蓝的吸附过程。

The preparation of Sodium alginate/graphene oxide pellets, methylene blue is representative as adsorption drugs. Adsorption properties of new sodium alginate/graphene oxide pellets, sodium alginate/ graphene oxide pellets on the adsorption capacity of methylene blue were studied in the effects of different conditions （such as adsorption time, initial pH, amount and initial concentration of methylene blue）. Re- sults show that the adsorption capacity increased with the ball adding amount and initial concentration. Adsorption of meythyene blue by Sodium alginate/graphene oxide pellet well fitted the Freundlich adsorp- tion isothermal equation. Results show that pH value has little effect on the adsorption effect. The maxi- mum adsorption capacity was 157.73 mg/g at pH 6. At 20 ~C, the adsorption of methylene blue on equi- librium reach about 6 h, pseudo-second-order kinetic model can better describe the adsorption of methylene blue by sodium alginate/graphene oxide pellets than that of the pseudo-first-order kinetic model.