Chitosan-based foam composites for hexavalent chromium remediation: Effect of microcellulose and crosslinking agent content

Author(s)

Silva, Marcelo Bruno de Oliveira ; Costa, Talles Barcelos da ; Camani, Paulo Henrique ; Rosa, Derval dos Santos

• Document type: Journal article
• Source: International Journal of Biological Macromolecules; v. 264, p. 12-pg., 2024-03-01.

Abstract

Potentially toxic metal ions, such as hexavalent chromium (Cr6+), present in water concern the population's health due to their persistence, bioaccumulation potential, and high toxicity. Highly porous materials based on polysaccharides are promising technologies for metal removal due to their high surface area, biodegradability, and low toxicity. This study evaluated the effect of concentrations of microcellulose (0.5, 1, and 1.5 %) and glutaraldehyde (1, 2, and 3 %) in the adsorption capacity and mechanical properties of chitosan foams. The developed foams exhibited a three-dimensional structure with interconnected pores. Compared to foams without microcellulose, adding 1.5 % microcellulose increased up to 180 % in maximum stress supported by the foams and up to 135 % in Young's modulus. However, Cr6+ sorption capacity decreased with increasing microcellulose and crosslinking agent content due to the occupation of amino groups. Still, the foams exhibited a highly favorable sorption behavior, and the Sips isotherm model provided the best fit to the experimental data. The maximum sorption capacity reached approximately 1.4 mmol center dot g(-1) at pH 4.0 and 25 degree celsius. The foam structural integrity, enhanced mechanical properties, and efficient sorption capacity make them viable alternatives for environmentally friendly and cost-effective treatment of water contaminated with Cr6+ ions. (AU)

• FAPESP's process: 20/13703-3 - Environmentally friendly porous materials for the recovery and revaluation of metals reclaimed from contaminated water
• Grantee: Derval dos Santos Rosa
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 23/11229-0 - Biodegradable porous composite membranes based on PLA containing nanoclay/nanocellulose for removal and recovery of PTEs from contaminated water
• Grantee: Paulo Henrique Camani
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 22/11133-0 - Development of biodegradable porous starch hydrogels containing modified nanocellulose or nanoclays for the removal and recovery of metals in contaminated water
• Grantee: Talles Barcelos da Costa
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 23/11783-8 - Composite starch hydrogels for sorption of potentially toxic elements in contaminated water: synergistic interaction between selective ligands in modified nanocellulose
• Grantee: Talles Barcelos da Costa
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• FAPESP's process: 19/16301-6 - Starch aerogels containing modified nanocellullose for removal of heavy metals in wastewater from the industry sector
• Grantee: Paulo Henrique Camani
• Support Opportunities: Scholarships in Brazil - Doctorate