Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China; Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing 100091, China; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Province, Nanjing 210042, China; Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Beijing 100714, China; National Engineering Lab. for Biomass Chemical Utilization, Nanjing 210042, China.
Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China; Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing 100091, China.
Carbohydr Polym. 2021 Apr 15;258:117622. doi: 10.1016/j.carbpol.2021.117622. Epub 2021 Jan 18.
As a kind of potential heavy metal absorbent, polysaccharide-based materials are limited by the complicated preparation method and bad selectivity toward targeted ion. Here, a fantastic sponge was produced by combining salecan and graphene oxide (GO) nanosheets via ice template-assisted freeze drying and ion-imprinting technologies. The intense intermolecular interactions between salecan and GO gave the sponge high stability. The swelling, morphology, and mechanical stiffness of the material showed highly dependent on the salecan content. Additionally, the influence of salecan content, pH, initial ion concentration, and contact time on Hg adsorption was extensively investigated. Adsorption kinetics and equilibrium isotherms perfectly fitted in the pseudo-second-order and Freundlich models, reflecting the multilayer chemical-adsorption mediated mechanism. Most strikingly, the ion-imprinted sponge exhibited strong selectivity toward Hg and outstanding stability with recyclability over usage of five times. These investigations provide the guidance for the construction of promising polysaccharide-based adsorbents for the remediation of Hg-polluted water.
作为一种潜在的重金属吸附剂，基于多糖的材料受到复杂的制备方法和对目标离子较差选择性的限制。在这里，通过冰模板辅助冷冻干燥和离子印迹技术，将沙利聚糖和氧化石墨烯（GO）纳米片结合在一起，制备出了一种奇妙的海绵。沙利聚糖和 GO 之间强烈的分子间相互作用赋予了海绵高稳定性。材料的溶胀、形态和机械硬度高度依赖于沙利聚糖的含量。此外，还广泛研究了沙利聚糖含量、pH 值、初始离子浓度和接触时间对 Hg 吸附的影响。吸附动力学和平衡等温线完美符合准二级和 Freundlich 模型，反映了多层化学吸附介导的机制。最引人注目的是，印迹海绵对 Hg 表现出很强的选择性和出色的稳定性，可重复使用五次以上。这些研究为构建有前途的多糖基吸附剂用于修复 Hg 污染水提供了指导。
