张伟文, 刘胜利, 胡勇有. 石墨烯气凝胶对四溴双酚A的吸附研究[J]. 华南师范大学学报(自然科学版), 2018, 50(2): 50-56.
引用本文: 张伟文, 刘胜利, 胡勇有. 石墨烯气凝胶对四溴双酚A的吸附研究[J]. 华南师范大学学报(自然科学版), 2018, 50(2): 50-56.
Adsorption of Tetrabromobisphenol-A by Graphene Aerogels[J]. Journal of South China Normal University (Natural Science Edition), 2018, 50(2): 50-56.
Citation: Adsorption of Tetrabromobisphenol-A by Graphene Aerogels[J]. Journal of South China Normal University (Natural Science Edition), 2018, 50(2): 50-56.

石墨烯气凝胶对四溴双酚A的吸附研究

Adsorption of Tetrabromobisphenol-A by Graphene Aerogels

  • 摘要: 为了解决石墨烯吸附剂在水中易团聚、流失及难以回收利用的问题,以NaHSO3为还原剂,通过化学还原自组装的方法制备了石墨烯气凝胶吸附剂(S-RGA). 采用SEM和BET对S-RGA和其孔径进行了表征,结果表明S-RGA是具有细密均匀多孔的块状结构体,比表面积达到98.37m2/g,平均孔径为7.48 nm. S-RGA对四溴双酚A(TBBPA)的吸附研究结果表明,S-RGA对TBBPA有较高的吸附容量和较好的重复利用率,在初始TBBPA质量浓度为0.25 mg/L时,随吸附剂的量增加,S-RGA的吸附容量先增加后减少,当吸附剂的量为15 mg/L时,达到最大吸附效率;当溶液pH>7,随着pH的增大,由于S-RGA与TBBPA之间的静电斥力作用,其吸附容量随之减少;S-RGA对 TBBPA的吸附也受离子强度影响,随着离子强度的增大,其吸附容量呈现先减少后增加的趋势. S-RGA对TBBPA吸附过程符合准二级动力学和Freundlich吸附等温线,经过5次循环吸附试验,S-RGA对TBBPA吸附容量仅损失6.83%.

     

    Abstract: In order to solve the problem that the graphene adsorbent was easy to be agglomerated, lost and difficult to be recycled in water, graphene aerogels adsorbent (S-RGA) was prepared by chemical reduction self-assembly with NaHSO3 as reductant. S-RGA and its pore size were characterized by SEM and BET. The results showed that S-RGA was a massive, homogeneous porous structure with a specific surface area of 98.37 m2/ g and an average pore size of 7.48 nm. The adsorption of tetrabromobisphenol A (TBBPA) by S-RGA was studied by parallel adsorption test. The results showed that S-RGA had higher adsorption capacity and better recycling of TBBPA. The adsorption capacity of S-RGA increased first and then decreased with the increase of the amount of adsorbent at the initial TBBPA concentration of 0.25 mg/L. When the amount of adsorbent was 15 mg/L, the maximum adsorption efficiency was obtained. When the solution pH 7, the adsorption capacity decreased with the increase of pH, due to the electrostatic repulsion between S-RGA and TBBPA. The adsorption of TBBPA by S-RGA was also affected by the ionic strength. With the increase of ionic strength, the adsorption capacity of S-RGA increased first and then increased. The adsorption of TBBPA by S-RGA was in accordance with pseudo-second-order kinetics and Freundlich adsorption isotherm. After five cycles of adsorption, S-RGA lost only 6.83% of TBBPA adsorption capacity.

     

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