Adsorptive Removal of Reactive Blue Dye by Cucumber Peel Adsorbent: Isotherm, Kinetics and Mass Transfer Studies

Abstract

AbstractDyes are substances added to fabric material which are making chemical bonds to impart colour to the cloth. Due to the increase in demand, the production of textile products also increasing proportionally, and the use of synthetic dyes has together contributed to dye wastewater becoming one of the important sources of severe pollution problems in current times. By considering the volume of effluent generated and its composition, the wastewater from textile industries is the most polluting one among all the industry sectors. Adsorption is a unit operation that adheres solute to the surface of the adsorbent and is useful in wastewater treatment. In the present study, batch experimental studies are investigated for the percentage removal of reactive blue dyes from an aqueous solution by using a cucumber peel adsorbent. The parameters under study were pH, time, initial reactive blue dye concentration, adsorbent dosage, and agitation speed. Adsorption isotherm follows Langmuir and Freundlich models. Adsorption kinetics reveals the fitting of experimental data to a pseudo-first order model. Mass transfer or diffusion studies explore the intraparticle diffusional mechanism for the adsorption of reactive blue dye on cucumber peel adsorbent. Thus, cucumber peel could be utilized as a cost-effective adsorbent for the removal of reactive blue dye from its aqueous solution.KeywordsAdsorptionReactive blue dyeCucumber peelIsothermKineticsMechanism