文献类型：期刊文献

英文题名：Self-assembly of binary oppositely charged polysaccharides into polyelectrolyte complex hydrogel film for facile and efficient Pb2+ removal

作者：Hu, Xinyu[1,2,3,4,5] Yan, Linlin[1,2] Wang, Yongmei[1] M., Xu[]

第一作者：胡新宇;Hu, Xinyu

通信作者：Hu, Xinyu

机构：[1] Institute of Chemical Industry of Forestry Products, Chinese Academy of Forestry, Key Lab. of Biomass Energy and Material, Jiangsu Province, Nanjing, 210042, China; [2] Research Institute of Forestry New Technology, Chinese Academy of Forestry, Beijing, 100091, China; [3] Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Jiangsu Province, Nanjing, 210042, China; [4] Key Lab. of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, Beijing, 100714, China; [5] National Engineering Lab. for Biomass Chemical Utilization, Nanjing, 210042, China

年份：2020

卷号：388

外文期刊名：Chemical Engineering Journal

收录：EI(收录号：20200608128396);Scopus(收录号：2-s2.0-85078820000)

语种：英文

外文关键词：Complex networks - Coulomb interactions - Electrostatics - Hydrogels - Monolayers - Polyelectrolytes - Polysaccharides - Reusability - Self assembly

摘要：Herein, a novel polyelectrolyte complex (PEC) hydrogel film has been fabricated through self-assembly of two oppositely charged polysaccharides salecan and carboxymethyl chitosan (CMCS) for Pb2+ removal. The formation of PEC network structure via electrostatic interactions was confirmed by FT-IR, XRD, XPS and TGA. The change of salecan/CMCS ratio had obvious influence on the swelling capacity, morphology and rheological properties of the hydrogel films. The adsorption capacity of Pb2+ was specifically investigated by tuning the salecan/CMCS ratio, other ions, pH, ion concentration and contact time. Furthermore, the equilibrium isotherms were better fitted with Langmuir model, indicating monolayer adsorption behaviour. The maximum adsorption capacity of Pb2+ according to Langmuir model was 418.4 mg/g, higher than that of some other adsorbents. The adsorption kinetics was well modelled by pseudo-second-order and Crank model, suggesting chemisorption and internal diffusion control mechanism. The PEC hydrogel film also exhibited excellent reusability after 5 adsorption/desorption cycles without obvious changes in the adsorption capacity. Overall, these results not only highlight a new idea for the utilization of salecan, but also provide a green method for the rational design of highly efficient adsorbent for Pb2+ removal. ? 2020 Elsevier B.V.