Preparation of novel carboxymethylchitosan-graft-poly(methylmethacrylate) under microwave irradiation as a chitosan-based material for Hg2+ removal
Preparation of novel carboxymethylchitosan-graft-poly(methylmethacrylate) under microwave irradiation as a chitosan-based material for Hg2+ removal
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DOI：
10.1016/j.microc.2019.05.029
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发表时间：
2019-07
影响因子：
4.8
通讯作者：
A. Labidi;A. Salaberria;J. Labidi;M. Abderrabba
中科院分区：
文献类型：
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作者：
A. Labidi;A. Salaberria;J. Labidi;M. Abderrabba
本文报道了一种新的微波辅助合成羧甲基壳聚糖-g-聚甲基丙烯酸甲酯（CMCS-g-PMMA）的方法。通过傅里叶变换红外光谱（ATR-FTIR）、13 C固体核磁共振谱、热分析（TGA、DTGA和DSC）、X射线衍射（XRD）和扫描电镜（SEM）分析对合成的样品进行了表征。研究了CS、CMCS和CMCS-g-PMMA对水溶液中汞（II）的吸附性能。在90 min内达到平衡。在25 °C下，CS、CMCS和CMCS-g-PMMA的最大吸附容量分别为68.69、75.75和87.71 mg g− 1。我们的数据表明，Hg 2+去除所使用的吸附剂遵循伪二级模型。热力学研究表明，吸附过程是自发的放热过程。此外，吸附被发现是物理的。对负载Hg 2+的吸附剂（CS、CMCS和CMCS-g-PMMA）进行聚乙二醇-水处理，解吸了约96%的清除离子。
The present study reports on a novel microwave assisted route of synthesis of carboxymethylchitosan-g-polymethylmethacrylate (CMCS-g-PMMA). The synthesized samples were characterized by Fourier transform infrared (ATR-FTIR),13C solid-state NMR spectroscopy, thermal analysis (TGA, DTGA and DSC), X-ray diffraction (XRD) and SEM analysis to provide evidence of successful grafting. The adsorption ability of mercury (II) from aqueous media on CS, CMCS and CMCS-g-PMMA was investigated. The equilibrium was reached within 90 min. The maximum adsorption capacity was found to be 68.69, 75.75 and 87.71 mg g−1from the Langmuir isotherm model at 25 °C for CS, CMCS and CMCS-g-PMMA respectively. Our data reveal that Hg2+removal by the used adsorbents follow the pseudo-second-order model. The thermodynamic study revealed that the adsorption process is spontaneous and exothermic. Besides, the adsorption was found to be physical. A polyethylene glycol -water treatment of the Hg2+loaded adsorbents (CS, CMCS and CMCS-g-PMMA) desorbed about 96% of the scavenged ions.