Preparation of cellulose nanocrystal-based poly (m-aminobenzene sulfonate) copolymer for heavy metal Cr (VI) adsorption

초록

In this study, we have synthesized cellulose nanocrystal-based poly (m-aminobenzene sulfonate) (PABS) copolymer by copolymerization with a conductive PABS onto cellulose nanocrystal (CNC) as a high value-added biomaterial application and its chemical structure analysis and Cr (VI) adsorption efficiency were analyzed. The chemical structure analysis of PABS and CNC-PABS confirmed that each functional group and bonding structure of them was identified and ultimately, CNC-PABS was successfully prepared. In addition, CNC-PABS was found to adsorb 100% Cr (V) in the 30 mL of Cr (VI) aqueous solution (2.5 mg/L) when 191.6 mg of CNC-PABS added, showing the theoretical maximum adsorption of Cr (VI) by CNC-PABS was found to be 99.81 mg/g. However, the adsorption efficiency was dependent on the pH range. 100% Cr (VI) was adsorbed in the pH range of 1~3, while the adsorption efficiency rapidly decreased as the pH was increased from 3 to 12. This was because the amine of PABS formed quaternary ammonium cation under acidic conditions, adsorbing anion species from Cr (VI) by electrostatic attraction but the adsorption effect was greatly reduced by electrostatic repulsion due to the sulfonate anions of PABS formed under alkaline conditions. © 2020 Korean Technical Assoc. of the Pulp and Paper Industry. All rights reserved.

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