In this study, bamboo-achieved cellulose is functionalized and upcycled into efficient bioadsorbents for dye adsorption and separation. Dialdehyde cellulose (DAC) was prepared through the chemical oxidation on cellulose surface via sodium periodate. Then, cationic Girard’s reagent T was covalently crosslinked onto the backbone of cellulose molecules to form the cationic aldehyde cellulose (cDAC). The chemical structure and morphology of two bioadsorbents were characterized. The adsorption behaviors of the functionalized DAC and cDAC to anionic Congo red (CR) and cationic Bismarck brown Y (BBY) were investigated systematically. The results showed that DAC could adsorb BBY more effectively while cDAC has a much higher adsorption capacity towards CR, this is due to the adsorption was dominated by both the static electric force and the chemical reaction between dyes and adsorbents. The adsorption process was found to follow the pseudo-second-order model. Both DAC and cDAC could maintain a high adsorption capacity under a wide pH range. Furthermore, the adsorption performance of six different dyes onto DAC and cDAC were studied, separately. Their adsorption capacities varied significantly on CR, BBY, Brilliant cresyl blue, Acid green 25, Acid brown M and Alizarin red S, and exhibited strong abilities for separating dye mixtures.

Selective adsorption and separation of dyes by dialdehyde cellulose and cationic dialdehyde cellulose

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.