期刊
ENVIRONMENTAL POLLUTION
卷 286, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2021.117324
关键词
Adsorbent; Water treatment; Metal adsorption; Cellulose dissolution; Molten salt hydrate
资金
- McIntire Stennis program [WIS01996]
- National Institute of Food and Agriculture (NIFA)
- U.S. Department of Agriculture (USDA)
- Advanced Materials Industrial Consortium (AMIC) Seed Program, the University of Wisconsin-Madison
The study developed cellulose-chitosan composite hydrogels with enhanced metal adsorption capacity and selective adsorption order compared to pure cellulose hydrogel. This innovative method demonstrated the potential of abundant and renewable natural polymers for creating biosorbents to remove metal ions from water.
Developing low-cost and high-performance biosorbent for water purification continues drawing more and more attention. In this study, cellulose-chitosan composite hydrogels were fabricated via a co-dissolution and regeneration process using a molten salt hydrate (a 60 wt% aqueous solution of LiBr) as a solvent. The addition of chitosan not only introduced functionality for metal adsorption but also increased the specific surface area and improved the mechanical strength of the composite hydrogel, compared to pure cellulose hydrogel. Batch adsorption experiments indicated that the composite hydrogel with 37% cellulose and 63% chitosan exhibited an adsorption capacity of 94.3 mg/g (1.49 mmol/g) toward Cu2+ at 23 ?C, pH 5, and initial metal concentration of 1500 mg/L, which was 10 times greater than the adsorption capacity of pure cellulose hydrogel. Competitive adsorption from a mixed metals solution revealed that the cellulose-chitosan composite hydrogel exhibited selective adsorption of the metals in the order of Cu2+ > Zn2+ > Co2+. This study successfully demonstrated an innovative method to fabricate biosorbents from abundant and renewable natural polymers (cellulose and chitosan) for removing metal ions from water. Superscript/Subscript Available
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