Preparation and characterization of crystalline nanocellulose modified as potential CO2 adsorbent

Chromium is a potentially toxic metal present in water and groundwater because of natural and anthropogenic factors. In this study, crystalline cellulose extracted from rice husk, was modified to tailor the structure and surface functionalities to improve its Cr (VI) adsorption capacity. Crystalline cellulose (crystallinity index of 72.5%) was obtained after alkaline treatment, and then it was subjected to a bleaching process to remove phenolic compounds as lignin and hemicellulose. Cellulose was modified by adding amine groups using polyethyleneimine (PEI) and glutaraldehyde (GA) as a crosslinker. Three different functionalized bioadsorbents were obtained, and FTIR-ATR, XRD, SEM-EDS, and XPS characterization techniques confirmed that cellulose has been functionalized with amine groups. Their adsorption capacities and adsorption kinetics were evaluated, finding adsorption capacities about 90 mg g-1, and velocities of Cr (VI) transport from the liquid phase to solid phase in the bioadsorbents studied around 0.02 s-1, which are rapid enough to suggest the use of this adsorbent for the treatment of water enriched with Cr (VI).

• Hovedforfatter: Hinojosa Peralta, Katherine Mishell (author)
• Format: bachelorThesis
• Sprog: eng
• Udgivet: 2022
• Fag: Cascarilla de arroz; Celulosa; Bioadsorbentes; Polietilenimina (PEI); Adsorción; Glutaraldehído (GA); Modificación; Rice husk; Cellulose; Bioadsorbents; Polyethyleneimine (PEI); Adsorption; Glutaraldehyde (GA); Modification
• Online adgang: http://repositorio.yachaytech.edu.ec/handle/123456789/490