Utility of acrylic acid grafted lignocellulosic waste sugarcane bagasse for the comparative study of cationic and anionic dyes adsorption applications

Abstract

Novel effective and eco-friendly advantageous acrylic acid grafted biosorbent derived from sugarcane bagasse (SB) have been explored for the degradation of cationic (MB and Rh 6G) and anionic (MR) dyes from wastewater. Analytical characterization of manufactured biosorbents was performed. To optimize operational conditions, batch adsorption studies were carried out. Cell-g-AAc is a biosorbent made by grafting acrylic acid onto the cellulose backbone. Dye adsorption as a function of pH, dye concentration temperature and contact time was analyzed. Opting several kinetics and adsorption models, the mechanism of adsorption and interactions between biosorbent Cell-g-AAc and various adsorbates were investigated. The Temkin adsorption isotherm has a larger R2 than the other two adsorption isotherms, indicating that the Temkin adsorption isotherm model better fits the adsorption data for MB and Rh 6g (cationic) dyes, but the adsorption of MR (anionic dye) matched the Langmuir model. The MR (anionic) dye followed a pseudo-first-order kinetic model during adsorption, while the pseudo-second-order model fits better for MB and Rh 6G (cationic) dyes and dye absorption (mg/g) that is substantially nearer to the observed value. Under ideal conditions, cellulose showed maximum dye removal efficiencies of 87.4 %, 90.2 %, and 73.9 % for the MB, Rh 6G, and MR dyes, respectively. The MB, Rh 6G, and MR dyes, on the other hand, showed 92 %, 97.1 %, and 80.6 % for Cell-g-AAc, respectively.