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Mesoporous cellulose-chitosan composite hydrogel fabricated via the co-dissolution-regeneration process as biosorbent of heavy metals
- Source :
- Environmental Pollution. 286:117324
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- 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.
- Subjects :
- 010504 meteorology & atmospheric sciences
Health, Toxicology and Mutagenesis
Metal ions in aqueous solution
Composite number
macromolecular substances
010501 environmental sciences
Toxicology
01 natural sciences
Water Purification
Chitosan
chemistry.chemical_compound
Adsorption
Metals, Heavy
Specific surface area
Cellulose
0105 earth and related environmental sciences
Aqueous solution
technology, industry, and agriculture
Hydrogels
General Medicine
Hydrogen-Ion Concentration
Pollution
Kinetics
Solubility
chemistry
Chemical engineering
Selective adsorption
Water Pollutants, Chemical
Subjects
Details
- ISSN :
- 02697491
- Volume :
- 286
- Database :
- OpenAIRE
- Journal :
- Environmental Pollution
- Accession number :
- edsair.doi.dedup.....d637d640d170916b7639e4079b3225e3