Adsorptive capacity of acrylonitrile grafted cellulosic wheat straw for the analysis on anionic and cationic dye removal

Abstract

In the present work, we prepared a novel efficient and environment-friendly poly (acrylonitrile)-grafted-cellulosic biosorbent from wheat straw. Poly (acrylonitrile) chains were grafted onto the cellulosic backbone and biosorbent cellulose-g-acrylonitrile (Cell-g-AN) was used for the removal of organic pollutants such as methyl red (MR), rhodamine 6G (Rh 6G) and methylene blue (MB) dyes from polluted water. Batch adsorption experiments were done to improve operating parameters. We examined the relationship between dye adsorption and pH, temperature, and contact time. The Cell-g-AN’s high grafting percentage value and nitrile group of AN, which under ideal pH conditions give extra binding sites, were found to be related to the material's adsorption capability for a variety of dyes. Under optimized circumstances, cellulose demonstrated maximal dye-removing capacities of 87.64%, 88.49%, and 63.08% for Rh 6G, MB, and MR dyes, respectively. Contrarily, Cell-g-AN showed 92.66%, 97.10%, and 66.86% for MB, Rh 6G, and MR dyes, respectively. Higher correlation coefficient results showed that Temkin and Langmuir adsorption models are most suitable for dyes, whereas when examining the adsorption kinetics of dye sorption, the pseudo 2^nd order kinetic model fits better.

Graphical Abstract