Synthesis and characterization of a high capacity ionic modified hydrogel adsorbent and its application in the removal of Cr(VI) from aqueous solution
Synthesis and characterization of a high capacity ionic modified hydrogel adsorbent and its application in the removal of Cr(VI) from aqueous solution
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高容量离子改性水凝胶吸附剂的合成、表征及其在去除水溶液中Cr(VI)中的应用
DOI：
10.1016/j.jece.2018.10.048
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发表时间：
2018-12
影响因子：
7.7
通讯作者：
Zhang Xiaodong
中科院分区：
文献类型：
--
作者：
Wang Yin;Du Baobao;Wang Jiayuan;Wang Yun;Gu Haonan;Zhang Xiaodong
将水凝胶分别与丙烯酸和甲基丙烯氧乙基三甲基氯化铵接枝共聚制备了CL-g-pAA和CL-g-pDMC两种改性水凝胶。采用x射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、扫描电镜（SEM）和热重（TG）对制备的样品进行了表征。通过批量实验确定了CL-g-pAA和CL-g-pDMC对溶液中Cr（VI）的去除能力。考察了pH、投加量和共存阴离子对Cr（VI）去除率的影响以及再生活性。对Cr（VI）的吸附随pH和温度的升高而降低。在水凝胶上引入−COOH和-[N+(CH3)3] （NR3+）基团增加了对Cr（VI）的吸附能力。基于成本和实际用水的考虑，最佳吸附条件为pH为5，温度为298 k，吸附剂剂量为0.1 g L−1，接触时间为500 min。天然水中常见的金属离子不会抑制水凝胶与Cr（VI）的反应。改性后的水凝胶对CL-g-pAA和CL-g-pDMC的吸附量分别为85.47 mg g- 1和105.26 mg g- 1。吸附动力学研究表明，吸附为准二级速率模型。Cr（VI）在CL-g-pAA和CL-g-pDMC上的吸附等温线符合Langmuir等温线方程。CL-g-pDMC对Cr（VI）的吸附是吸热的，具有较高的再生效率。结果表明，CL-g-pAA和CL-g-pDMC是废水中Cr（VI）分离和富集的基础材料。
Two modified hydrogels, CL-g-pAA and CL-g-pDMC, are prepared from hydrogels graft copolymerization with acrylic acid and methacryloxyethyl trimethyl ammonium chloride, respectively. The as prepared samples were characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Scanning electron microscopy (SEM) and Thermogravimetric (TG). Batch experiments were performed to determine the ability of CL-g-pAA and CL-g-pDMC to remove Cr(VI) from solution. The effect of pH, dosage and co-existing anions on Cr(VI) removal were investigated along with regeneration activity. The adsorption of Cr(VI) decreases with the increase of pH and temperature. The introduction of −COOH and-[N+(CH3)3] (NR3+) groups on hydrogels increases Cr(VI) adsorption capacity. Based on cost and actual water considerations the optimum adsorption occurs at pH 5, at a temperature of 298 k, with an adsorbent dose of 0.1 g L−1and with the contact time 500 min for the Cr (VI) removal. The usual metal ions of natural water would not inhibit the complexion reaction between hydrogels and Cr(VI). The modified hydrogels exhibited adsorption capacities of 85.47 mg g−1for CL-g-pAA and 105.26 mg g−1for CL-g-pDMC. The adsorption kinetic studies display adsorption to be the pseudo-second-order rate model. The adsorption isotherms of Cr(VI) on the CL-g-pAA and CL-g-pDMC were well fitted by the Langmuir isotherm equation. The Cr(VI) adsorption is endothermic and the CL-g-pDMC exhibits high regeneration efficiency. From the results, it was concluded that CL-g-pAA and CL-g-pDMC were underlying materials for the separation and preconcentration of Cr(VI) from wastewater.
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DOI：
10.1016/s1093-0191(02)00004-7
发表时间：
2003-01-01
期刊：
ADVANCES IN ENVIRONMENTAL RESEARCH
影响因子：
--
作者：
Goyal, N;Jain, SC;Banerjee, UC
通讯作者：
Banerjee, UC
由 Ce-BTC 金属有机骨架衍生的剑状 CuO/CeO2 复合材料，具有优异的 CO 氧化性能
影响因子：
3.9
作者：
Wang, Yin;Yang, Yiqiang;Liu, Ning;Wang, Yuxin;Zhang, Xiaodong
通讯作者：
Zhang, Xiaodong
影响因子：
7.7
作者：
S. Saini;S. Arora;Kirandeep;B. Singh;J. K. Katnoria;I. Kaur
通讯作者：
S. Saini;S. Arora;Kirandeep;B. Singh;J. K. Katnoria;I. Kaur
超薄氧化石墨烯封装在均匀的 MIL-88A(Fe) 中，用于增强可见光驱动的 RhB 光降解
影响因子：
22.1
作者：
Liu, Ning;Huang, Wenyuan;Wu, Minghong
通讯作者：
Wu, Minghong
影响因子：
11.2
作者：
Zhanhua Huang;Shouxin Liu;Bin Zhang;Qinglin Wu
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