用于去除亚甲基蓝的高性能琼脂/氧化石墨烯复合气凝胶。
High performance agar/graphene oxide composite aerogel for methylene blue removal.
机构信息
Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, 308 Ningxia Road, Qingdao 266071, China; College of Mechanical and Electrical Engineering, Qingdao University, 308 Ningxia Road, Qingdao 266071, China.
出版信息
Carbohydr Polym. 2017 Jan 2;155:345-353. doi: 10.1016/j.carbpol.2016.08.047. Epub 2016 Aug 16.
A novel three-dimensional (3D) agar/graphene oxide (AGO) composite aerogel was prepared by a vacuum freeze drying method. The AGO aerogel was tested for its adsorption capacity of methylene blue (MB) and was found to have a maximum adsorption capacity of 578mg/g, as determined from the Langmuir isotherm. The adsorption kinetic studies revealed that adsorption followed pseudo-second-order model. The thermodynamic parameters calculated from the Van't Hoff equation indicate that the adsorption was an endothermic and spontaneous process. The adsorption mechanism may be attributed to electrostatic interaction between MB and AGO aerogel. Furthermore, the AGO aerogel can easily be recycled with a dilute NaOH solution wash, retaining over 91% of the adsorption capacity after recycling three times.
一种新型的三维（3D）琼脂/氧化石墨烯（AGO）复合气凝胶通过真空冷冻干燥法制备。测试了 AGO 气凝胶对亚甲基蓝（MB）的吸附能力，发现其最大吸附容量为 578mg/g，根据朗缪尔等温线确定。吸附动力学研究表明，吸附遵循拟二级模型。根据范特霍夫方程计算的热力学参数表明，吸附是一个吸热和自发的过程。吸附机制可能归因于 MB 和 AGO 气凝胶之间的静电相互作用。此外，AGO 气凝胶可以很容易地用稀氢氧化钠溶液洗涤回收，在回收三次后保留超过 91%的吸附容量。
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