JOURNAL ARTICLE

Cationic Dialdehyde Nanocellulose from Sugarcane Bagasse\nfor Efficient Chromium(VI) Removal

Abstract

Cellulose-based\nmaterials are the most widely used green materials\nbecause of their abundance, sustainability, biodegradability, and\nfunctionalizability. The capability of cellulosic materials as adsorbents\nand coagulants to remove negatively charged contaminants from water\nrequires the possession of a positively charged functionality. In\nthis study, cationic dialdehyde cellulose (c-DAC) nanofibers with\nthree different degrees of oxidation were created by preparing metaperiodate-oxidized\ncellulose followed by cationization using Girard’s reagent\nT. The resulting c-DAC was applied for the removal of hexavalent chromium\n(Cr­(VI)) ions from water, where the efficiency was evaluated as functions\nof the initial chromium concentration, adsorption time, pH value,\nand co-existing anions. It was found that all c-DAC samples showed\nexcellent adsorption efficiencies against Cr­(VI), where the c-DAC\nwith the highest charge density exhibited the maximum adsorption capacity\nof 80.5 mg/g. The Cr­(VI) adsorption mechanism is found to be dominated\nby the electrostatic interactions between the quaternary ammonium\ncations on the c-DAC surface and Cr­(VI) ions and can be best described\nusing the Langmuir model. These samples also exhibited stable adsorption\ncapacity in a wide pH range, where the c-DAC surface could remain\npositively charged.

Keywords:
Nanocellulose Adsorption Cationic polymerization Hexavalent chromium Cellulose Chromium Surface charge Cellulosic ethanol

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Topics

Advanced Cellulose Research Studies
Physical Sciences →  Materials Science →  Biomaterials
Adsorption and biosorption for pollutant removal
Physical Sciences →  Environmental Science →  Water Science and Technology
Fluoride Effects and Removal
Physical Sciences →  Environmental Science →  Water Science and Technology
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