Single and binary adsorption of dyes from aqueous solutions using functionalized microcrystalline cellulose from cotton
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pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Single and binary adsorption of dyes from aqueous solutions using functionalized microcrystalline cellulose from cotton fiber Hongjuan Bai, Junhang Chen†, Xiangyu Zhou, and Chengzhi Hu Province Key Laboratory of Cereal Resource Transformation and Utilization, School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou 450001, P. R. China (Received 27 March 2020 • Revised 26 June 2020 • Accepted 30 June 2020) AbstractSimultaneous removal of dyes in the effluents of printing and dyeing industries is challenging, and the mechanism of the co-adsorption of dyes is still unclear. In this context, a novel adsorbent based on microcrystalline cellulose from cotton fiber through a simplified chemical modification process was prepared. Methylene blue (MB) and neutral red (NR) were selected to investigate their adsorption/co-adsorption on such functionalized microcrystalline cellulose. The experimental adsorption results indicated that the adsorption quantity of both dyes was similar for the single solute. The kinetics of adsorption processes could be better described with the pseudo-second order models for both single and binary dye solutes. The results of the co-adsorption suggested that the extended Langmuir model could well predict equilibrium. The maximum adsorption capacity of MB and NR for the single systems was 115.2 and 83.2 mg/g, respectively. Moreover, an antagonistic effect could be found in the binary dye solute. The obtained results revealed that the co-adsorption of dyes might be driven by hydrogen bonding, - stacking interaction as well as electrostatic interaction. Keywords: Dyes, Cellulose-based Adsorbent, Microcrystalline Cellulose, Adsorption Mechanism, Co-adsorption
lose based adsorbent with a dye-binding capacity for water treatment has been widely studied. These adsorbents are always derived from agro-biomass, such as sugarcane bagasse [1], banana fiber [21], rice straw [18], and oil palm fronds [22]. Cotton fiber (CF) is constituted mainly of cellulose, possessing abundant hydroxyl groups, which could be easily modified with specific functional groups (for example: cyclodextrin, amino, carboxyl as well as sulfur group) to target different types of pollutants [1]. Besides, it has been proved that cellulose could be used as an efficient adsorbent to remove organic dyes from wastewater. Microcrystalline cellulose (MCC, a white, crystalline powder and biodegradable material) with high degree of crystallinity can be isolated from -cellulose. Compared to pristine cellulose, MCC has a lower degree of polymerization and higher surface area. Chemical modification with effective groups on cellulose and/or microcrystalline cellulose can improve adsorption ability to specific pollutants. As a widely used etherifying agent, 3-chloro-2-hydroxypropyl trimethyl ammoniumchloride (CTA) is often used for the adsorption of pollutants in wastewater treatment. Furthermore, 2-acrylamide-2-methyl propane sulfonic acid (
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