Smart superabsorbent alginate/carboxymethyl chitosan composite hydrogel beads as efficient biosorbents for methylene blue dye removal  

作　　者：Zhen Zhang Noureddine Abidi Lucian Lucia 

机构地区：[1]Department of Forest Biomaterials,NC State University,Raleigh,NC,USA [2]Fiber and Biopolymer Research Institute,Department of Plant and Soil Science,Texas Tech University,Lubbock,TX,USA [3]Department of Chemistry,NC State University,Raleigh,NC,USA

出　　处：《Journal of Materials Science & Technology》2023年第28期81-90,共10页材料科学技术（英文版）

摘　　要：The presence of toxic dyes in the aqueous medium has threatened environmental safety, and thereby re- moving them from wastewater in an efficient way is highly desired. Herein, the efficient biosorbents were successfully fabricated via a facile physical gelation process of sodium alginate (SA) and carboxymethyl chitosan (CMCTS) in an acidic aqueous solution. The as-prepared hydrogel beads not only displayed water superabsorbent properties and pH-responsive swelling characters but also exhibited excellent methylene blue (MB) adsorption capacity removal efficiency with experimental maximum MB adsorption capacity of 2518 and 1005 mg g -1 , which are comparable with most reported lignocellulosic and alginate-based hydrogels. The MB adsorption process fitted well in different kinetic and isotherm models and became more heterogeneous in concentrated MB solutions as verified by principal component analysis results. The adsorption mechanism was proposed, and the high dye absorbency was attributed to the strong electro- static forces between adsorbents and adsorbates. Our current study provides a promising and sustainable composite hydrogels platform targeted to dye decontamination.

关 键 词：HYDROGEL Dye adsorption Composites SUPERABSORBENT Sodium alginate Carboxymethyl chitosan 

分 类 号：R318[医药卫生—生物医学工程] TQ427.26[医药卫生—基础医学]