Lignin xanthate resin-bentonite clay composite as a highly effective and low-cost adsorbent for the removal of doxycycline hydrochloride antibiotic and mercury ions in water
Lignin xanthate resin-bentonite clay composite as a highly effective and low-cost adsorbent for the removal of doxycycline hydrochloride antibiotic and mercury ions in water
复制标题
木质素黄原酸树脂-膨润土复合材料作为高效、低成本吸附剂去除水中盐酸多西环素抗生素和汞离子
DOI：
10.1016/j.jhazmat.2019.01.026
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发表时间：
2019-04-15
影响因子：
13.6
通讯作者：
Li, Zhili
中科院分区：
文献类型：
--
作者：
Kong, Yan;Wang, Lu;Li, Zhili
天然聚合物插层无机粘土复合材料因具有环保、经济、易得等特点，在净水领域受到越来越多的关注。因此，通过一种可行的工艺制备了一种新型木质素黄原酸酯树脂(LXR)插层膨润土复合材料(LXR-BT)，用于吸附水中代表性的有机多西环素(DCH)抗生素和无机汞(II)。通过X射线衍射、傅里叶变换红外光谱、热重分析、扫描电子显微镜等测试手段对其结构进行了表征，证实了LXR已成功插层到膨润土层间。研究了LXR-BT在不同投加量、不同溶液pH、不同接触时间、不同初始DCH/Hg(II)浓度下对DCH/Hg(II)的吸附性能。结果表明，LXR-BT对DCH/Hg(II)的吸附容量远高于膨润土，吸附动力学符合准二级模型，吸附等温线符合Langmuir模型。X-射线光电子能谱(XPS)分析证实，DCH(或Hg(II))的吸附机理主要是DCH与LXR-BT中官能团的7G-n相互作用和氢键作用(或Hg2+的络合作用)。这项研究表明，LXR-BT作为一种新型高效的吸附剂去除水中的有机和无机污染物是可能的。
Natural-occurring polymer intercalated inorganic clay composites have received increasing interests in water cleanup for the features of eco-friendliness, cost-effectiveness, and availability. Herein, a new lignin xanthate resin (LXR) intercalated bentonite clay composite (LXR-BT) for the adsorption of representative organic doxycycline hydrochloride (DCH) antibiotic and inorganic Hg(II) in water was created through a feasible process. Structural characterizations by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Thermo gravimetric analysis (TG), and scanning electron microscopy (SEM) confirmed LXR was successfully intercalated between the layers of bentonite clay. The adsorption performance of DCH/Hg(II) by LXR-BT was studied in detail with varied dosage, solution pH, contact time, and initial DCH/Hg(II) concentration. The results indicated that the adsorption capacities of DCH/Hg(II) on LXR-BT were much higher than that on bentonite, and the adsorption kinetics and isotherms followed the pseudo-second-order model and Langmuir model, respectively. X-ray photoelectron spectroscopy (XPS) analysis confirmed the adsorption mechanisms of DCH (or Hg(II)) was mainly due to 7G-n interaction and hydrogen bonding interaction of DCH (or the complexation of Hg(II)) with the functional groups in the LXR-BT. This study suggested the possibility of LXR-BT as a new cost-effective adsorbent for both organic and inorganic pollutants removal in water.