• Anuja Agarwal
• Vaishali
• Poonam Khare

Chitosan hydrogel nanobeads using glutaraldehyde as crosslinker has been studied as adsorbent by adopting batch method throughout the investigation for removing congo red (CR) from outflow water effluent. Results show that percent removal of CR dye has been found to be 35% to 63% at varying initial concentration of dye solution from 7000 to 1000 mg/l in 24 hours. The studies for adsorption isotherms were carried out at various temperature and initial dye concentration at pH 5.0 as dye is stable in acidic solution. The adsorption equilibriums were analyzed by applying three isotherm models: Langmuir, Freundlich and Temkin model. Adsorption data of the dye gave best linearity into the Langmuir model at various temperatures. Adsorption of dye decreases with increasing pH and dye initial concentration. It also increases with increasing temperature. Thermodynamic parameters such as changes in Gibbs free energy (ΔG), enthalpy (ΔH) and entropy (ΔS) were also calculated. Adsorption process corresponds to physical adsorption as ΔG values lie between -6.95 and -12.85 KJ/mol.

Chitosan, adsorption, nanobeads, Congo red, dye etc.

"The study of Adsorption & Adsorption isotherms for color removal from water effluent", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 6, page no.1888-1896, June-2020, Available :http://www.jetir.org/papers/JETIR2006599.pdf

"The study of Adsorption & Adsorption isotherms for color removal from water effluent", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 6, page no. pp1888-1896, June-2020, Available at : http://www.jetir.org/papers/JETIR2006599.pdf