Adsorption and removal of rhodamine B from aqueous solution by tannic acid functionalized graphene
Adsorption and removal of rhodamine B from aqueous solution by tannic acid functionalized graphene
复制标题
单宁酸功能化石墨烯吸附去除水溶液中的罗丹明B
DOI：
10.1016/j.colsurfa.2015.03.048
复制
发表时间：
2015-07-20
影响因子：
5.2
通讯作者：
Duan, Yixiang
中科院分区：
文献类型：
--
作者：
Liu, Kunping;Li, Huiming;Duan, Yixiang
以单宁酸为还原剂和封端剂，通过改变石墨烯表面的物理化学性质来提高吸附效率，采用一种简便、绿色的方法合成了单宁酸功能化石墨烯纳米复合材料。然后以所制备的TA-G为吸附剂，考察了其对罗丹明B(RB)的吸附行为。由于存在强烈的pi-pi堆积作用和静电吸引，TA-G对Rb表现出良好的吸附性能。吸附等温线符合Langmuir模型，由Langmuir模型计算的理论最大吸附容量为201 mg g(-1)，与实验测量数据吻合较好。吸附动力学完全符合准二级模型，化学吸附是吸附的限速步骤。因此，所制备的TA-G纳米复合材料将是去除水溶液中Rb的理想吸附剂，并为石墨烯在环境研究中的潜在应用打开了一扇新的大门。(C)2015爱思唯尔B.V.保留所有权利。
A facile and green method was employed to synthesize the tannic acid functionalized graphene nanocomposite (TA-G) using tannic acid as reducing as well as capping reagent which could alter graphene surface physicochemical properties to improve the adsorption efficiency. Then the as-prepared TA-G was used as adsorbent to investigate the adsorption behavior for rhodamine B (RB). Due to the intensive pi-pi stacking interaction and electrostatic attraction, TA-G exhibited fine adsorption performance for RB. The adsorption isotherm fitted Langmuir model well and the theoretical maximum of adsorption capacity calculated by Langmuir model was 201 mg g(-1) which was approximately in a close agreement with the experimental measured data. The kinetics of adsorption was consistent with the pseudo-second-order model perfectly and chemisorption was the speed limit step. Therefore, the as-prepared TA-G nanocomposite would be an ideal adsorbent for the removal of RB in aqueous solution and opened a new door to broaden the potential applications of graphene in environmental research. (C) 2015 Elsevier B.V. All rights reserved.