Faculty of Material and Chemistry, China University of Geosciences, Wuhan 430074, China.
Faculty of Material and Chemistry, China University of Geosciences, Wuhan 430074, China; Engineering Research Center of Nano-Geomaterials of Education Ministry, China University of Geosciences, Wuhan 430074, China.
Int J Biol Macromol. 2018 Mar;108:1199-1206. doi: 10.1016/j.ijbiomac.2017.11.027. Epub 2017 Nov 7.
A novel effective cellulose-based adsorbent was prepared through two common reactions, which included the esterification of sugarcane bagasse cellulose with excess stearic acid and the reaction of grafting polyacrylamide brush by ultraviolet radiation initiation. The adsorbent can effectively adsorb Hg(II) ion from wastewater. The characterization of the adsorbents was conducted by optical microscope (OM), scanning electron microscopy (SEM-EDS) and infrared spectrometry (FTIR). Full kinetic and thermodynamic investigations as well as isotherm analysis were also undertaken. Due to the abundant amide groups, the cellulose-based adsorbents exhibit excellent adsorption performance for the removal of Hg(II) ion from aqueous solution with a maximum adsorption capacity of 178mg/g. Furthermore, the cellulose-based adsorbents can be easily separated from the aqueous solution after adsorption and regenerated using 0.2M HCl solution, which exhibits high adsorption capacity after six adsorption-desorption cycles. In view of the easily-operated cost-effective preparation technique, substantial adsorption efficiency and excellent adsorption recyclability, therefore, the eco-friendly cellulose-based adsorbents could be used for water purification effectively. More importantly, this work improves value of low-cost biomass resources.
一种新型高效的纤维素基吸附剂是通过两种常见的反应制备的，包括甘蔗渣纤维素与过量硬脂酸的酯化反应和通过紫外辐射引发接枝聚丙烯酰胺刷的反应。该吸附剂可有效吸附废水中的 Hg(II)离子。通过光学显微镜 (OM)、扫描电子显微镜 (SEM-EDS) 和红外光谱 (FTIR) 对吸附剂进行了表征。还进行了全动力学和热力学研究以及等温线分析。由于含有丰富的酰胺基团，纤维素基吸附剂对水溶液中 Hg(II)离子的去除表现出优异的吸附性能，最大吸附容量为 178mg/g。此外，吸附后，纤维素基吸附剂可通过 0.2M HCl 溶液容易地从水溶液中分离出来，并在六次吸附-解吸循环后仍保持高吸附容量。鉴于其易于操作、成本效益高的制备技术、高吸附效率和优异的吸附可回收性，因此，这种环保型纤维素基吸附剂可有效地用于水净化。更重要的是，这项工作提高了低成本生物质资源的价值。
