Tetracycline absorbed onto nitrilotriacetic acid-functionalized magnetic graphene oxide: Influencing factors and uptake mechanism
Tetracycline absorbed onto nitrilotriacetic acid-functionalized magnetic graphene oxide: Influencing factors and uptake mechanism
复制标题
次氮基三乙酸功能化磁性氧化石墨烯吸附四环素：影响因素和吸收机制
DOI：
10.1016/j.jcis.2016.09.037
复制
发表时间：
2017-01-01
影响因子：
9.9
通讯作者：
Yan, Zhi-li
中科院分区：
文献类型：
--
作者：
Li, Mei-fang;Liu, Yun-guo;Yan, Zhi-li
通过将次氮基三乙酸接枝到磁性氧化石墨烯（NDMGO）上合成了一种新型磁性纳米材料，该材料用作去除水溶液中四环素（TC）的吸附剂。使用 TG-DTA、SEM、TEM、XRD、VSM、XPS、拉曼、BET 表面积和 zeta 电位测量对纳米材料进行表征。研究了影响吸附过程的几种实验条件（溶液pH、吸附时间、温度、离子强度和外来离子）。结果表明，溶液pH值会影响TC的吸附能力。 TC的吸附量在最初的20 min内迅速增加，最终在600 min左右达到平衡。准二级动力学为实验数据提供了更好的相关性。各种热力学参数表明吸附是一个自发的吸热过程。溶液中 NaCl 和背景电解质的存在对 TC 吸附有轻微影响。 NDMGO 和 TC 之间的氢键、酰胺化反应 pi-pi 和阳离子-pi 相互作用可以用来解释吸附机理。再生实验表明该纳米材料具有优异的再生性能。根据实验结果以及与其他吸附剂的比较分析，NDMGO是一种高效、可重复使用的TC污染控制吸附剂。 (C) 2016 Elsevier Inc. 保留所有权利。
A novel magnetic nanomaterial was synthesized by grafting nitrilotriacetic acid to magnetic graphene oxide (NDMGO), which was applied as an adsorbent for removing tetracycline (TC) from aqueous solutions. The nanomaterial was characterized using TG-DTA, SEM, TEM, XRD, VSM, XPS, Raman, BET surface area and zeta potential measurements. Several experimental conditions (solution pH, adsorption time, temperature, ionic strength and foreign ions) affecting the adsorption process were investigated. The results showed that the TC adsorption capacity could be affected by solution pH. The adsorption capacity of TC increased rapidly in the initial 20 min and finally reached equilibrium was about 600 min. The pseudo-second-order kinetics provided the better correlation for the experiment data. Various thermodynamic parameters indicated that the adsorption was a spontaneous and endothermic process. The presence of NaCl and background electrolytes in the solution had a slight influence on TC adsorption. Hydrogen bonds, amidation reaction pi-pi and cation-pi interaction between NDMGO and TC could be used to explain the adsorption mechanism. The regeneration experiment demonstrated that this nanomaterial possessed an excellent regeneration performance. Based on the experimental results and comparative analysis with other adsorbents, the NDMGO was a high-efficiency and reusable adsorbent for TC pollution control. (C) 2016 Elsevier Inc. All rights reserved.