• 文献标题:   High-Strength Chitin Based Hydrogels Reinforced by Tannic Acid Functionalized Graphene for Congo Red Adsorption
  • 文献类型:   Article
  • 作  者:   LIU CY, LIU HY, TANG KY, ZHANG KK, ZOU ZX, GAO XP
  • 作者关键词:   tannic acid, graphene, chitin, hydrogel, dye adsorption
  • 出版物名称:   JOURNAL OF POLYMERS THE ENVIRONMENT
  • ISSN:   1566-2543 EI 1572-8919
  • 通讯作者地址:   Henan Univ Sci
  • 被引频次:   3
  • DOI:   10.1007/s10924-020-01663-5
  • 出版年:   2020

▎ 摘  要

In this study, a novel chitin based composite hydrogel reinforced by tannic acid modified reduced graphene oxide (TRGO) was prepared via a facile freezing-thawing approach. Epichlorohydrin (ECH) and TRGO sheets were employed as efficient crosslinkers to fabricate dually crosslinked TRGO/chitin composite hydrogels with advanced mechanical and adsorption properties. Results indicated that the TRGO reinforced chitin composites increased the mechanical property remarkably with exhibiting compression strength from 22.7 kPa for neat chitin hydrogel to 72.3 kPa for the hydrogel with loading of 7% TRGO. Multiple interactions such as hydrogen bonding between TRGO and chitin as well as the dually covalent crosslinking bonds were responsible for the extensive improvement in compression strength. Furthermore, the TRGO reinforced hydrogels exhibited an excellent adsorption capacity towards Congo red (CR). The maximum adsorption capacity of CR was 230.5 mg g(-1) for chitin hydrogel with loading of 7% TRGO. The adsorption of CR was found following the Langmuir isotherm and pseudo-second-order models. Hence, the prepared TRGO/chitin hydrogels provide an easy and efficient way for the removal of CR dye from wastewater.