Removal of Yellow20 Dye from Aqueous Solution using Organo-rice Straw: Characteristic, Kinetic and Equilibrium Studies

Abstract

The adsolubilisation of tetradecyltrimethyl ammonium bromide on rice straw as adsorbent termed 'organo-rice straw' was developed in this research to enhance the decolorization behavior of yellow20 from aqueous solution. The organo-rice straw was characterized by elemental analysis, BET method, FTIR technique, and SEM images. Batch studies were studied to address various experimental parameters such as contact time, initial solution pH, and initial dye concentration. Results showed that the major contents of yellow20 and organo-rice straw were carbon and hydrogen indicating their hydrophobic natures. The yellow20 uptake on the organo-rice straw was higher than that of the precursor. The equilibrium adsorption was reached within 3.0 h and the amount of yellow20 adsorbed was independent of the pH₀. The kinetic data were fitted to pseudo-first order, pseudo-second order, and intraparticle diffusion models. Results imply that adsorption of yellow20 on this adsorbent nicely followed the second order kinetic model and maximum adsorption capacity was found to be 166.55 mg.g^-1. Equilibrium isotherms were analyzed by Langmuir, Freundlich, Temkin, and Dubinin-Radushkevtch isotherms. Freundlich isotherm described the isotherm data with high-correlation coefficients. The results of the present study substantiate that organo-rice straw is a potential and active bio-sorbent for the removal of the yellow20.