文献类型：期刊文献

英文题名：Laponite crosslinked starch/polyvinyl alcohol hydrogels by freezing/thawing process and studying their cadmium ion absorption

作者：Yu, Chen[1];Tang, Xiaozhi[1];Liu, Shaowei[2];Yang, Yuling[1];Shen, Xinchun[1];Gao, Chengcheng[1]

机构：[1]Nanjing Univ Finance & Econ, Coll Food Sci & Engn, Collaborat Innovat Ctr Modem Grain Circulat & Saf, Key Lab Grains & Oils Qual Control & Proc, Nanjing 210023, Jiangsu, Peoples R China;[2]East China Univ Sci & Technol, Dept Food Sci & Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：117

起止页码：1

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：;EI(收录号：20242616503456);WOS:【SCI-EXPANDED(收录号:WOS:000442057700001)】；

基金：The project was funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

语种：英文

外文关键词：Laponite; Hydrogel; Cadmium ion absorption

摘要：In this study, Laponite RD (LRD) cross-linked hydrogels consisting of starch, polyvinyl alcohol (PVA) were prepared by freezing/thawing process and the influence of LRD content on structure and properties of hydrogels was investigated. FTIR showed a new structure of hydrogen bonding might result from cross-linking reactions between LRD and polymers. X-ray diffraction (XRD) analysis showed that high degree of exfoliation of LRD clay layers had occurred during the preparation of hydrogels. The synergistic effect of physical cross-linking by freeze/thaw cycles and by LRD led to more porous, uniform and stable network, which was shown in SEM images. The melting temperature decreased and thermal stability got improved with the increase of LRD content. Reswelling ratios of hydrogels had the highest value when LRD content was 10%. Additionally, cadmium ion absorption capacity of the hydrogel was studied and the results showed that increasing the concentration of LRD increased absorption ratio and amount of Cd2+ ion in the solution. In a word, LRD could be used as a physical crosslinker and reinforced agent for starch-PVA based hydrogels and the formed hydrogels could be used as novel type and high capacity absorbent materials in heavy metal removing processes. (C) 2018 Elsevier B.V. All rights reserved.