Poll Res. 41 (3) : 1056-1061 (2022) Copyright © EM International ISSN 0257–8050 DOI No.: http://doi.org/10.53550/PR.2022.v41i03.043 BIOSORPTION OF METHYLENE BLUE DYE FROM WASTEWATER USING MODIFIED CHICKPEA HUSK AS AN ADSORBENT SONIA RANI 1 , JYOTI RANI 1 , ANITA SINGH 1 , NARESH KUMAR 2 , SUDESH CHAUDHARY 1 * 1 Centre of Excellence for Energy and Environmental Studies, DCRUST, Murthal, 131 039, Haryana, India 2 Government College for Women, Sonepat 131 001, Haryana, India (Received 1 February, 2022; Accepted 4 March, 2022) ABSTRACT The purpose of this study was to extract activated carbons by chemical activation from chickpea husks (H 2 SO 4 ) and to investigate the adsorbent potential for removing dye from aqueous solutions. SEM and FTIR techniques were initially defined as adsorbent. The experimental data were evaluated to optimize the initial ion concentration, pH, contact time and adsorbent dose of the different parameters. Various kinetic models and isotherm adsorption were used to illustrate the adsorbent’s proper mechanism and performance. Langmuir adsorption isotherm found to have the maximum adsorption potential of 200 mg/g. KEY WORDS: Adsorption isotherms, Kinetics, Optimization, Chickpea husk. INTRODUCTION Dyes have for quite some time been utilized in the dyeing, paper ventures; printing, materials, plastics, cowhide, beautifiers, pharmaceuticals and agri- nourishment businesses, yet the effluents released by these enterprises represent certain dangers and ecological issues (Hassaan et al., 2017). These businesses have demonstrated a noteworthy increment in the utilization of engineered colors as a shading material. Since dyes have a manufactured inception and complex sweet-smelling atomic structures, they are dormant and hard to biodegrade when released into waste streams (Kumar et al., 2011). The expulsion of engineered dyes is of extraordinary worry, since certain dye and their debasement items might be cancer-causing agents and poisonous and, therefore, their treatment can’t rely upon biodegradation alone. The precious methylene blue dye has been considered due to its known solid adsorption onto solids, and it regularly fills as a model compound for evacuating natural contaminants and colored substances from fluid arrangements (Hameed et al., 2007). Numerous physico-chemical strategies have been tried, yet just that of adsorption was viewed as better than different procedures (Subramaniam et al., 2015). Adsorption procedure is an appropriate method for inorganic and natural contaminations expulsion from wastewater, as a result of the noteworthy preferences like ease, accessibility, gainfulness, simplicity of activity, proficiency, and adequacy than different strategies. This procedure is anything but difficult to work and similarly compelling in the evacuation of dangerous contaminations, even at low fixations (Uddin, 2017). Adsorption is ordinarily a surface marvel, its exhibition being emphatically identified with the interesting properties of explicitly structured sorbent material. Adsorption procedure can be a physical adsorption which include just moderately powerless intermolecular powers, and chemisorptions which include the development of a synthetic security between the adsorbate particle and the outside of the adsorbent (Sintayehu et al., 2016). In the present study, we are investigating adsorption capacity of activated chickpea husk (Cicer arientum) to eliminate methylene blue dye from aqueous medium. Chickpea husk is an agricultural waste produced from husking mill.