• Arshi Rastogi
• Surabhi Sagar

The kinetics, adsorption isotherms, and thermodynamics of the removal of the anthraquinone dye Alizarin by adsorption onto dried Vaucheria sp. algal biomass were investigated. Several adsorption isotherms and kinetic models were determined using the optimized parameters from the batch adsorption studies. Three different theoretical models were used to examine adsorption kinetics: the pseudo-first-order, the pseudo-second-order, and the intraparticle models. Four different models were used to determine adsorption isotherms: the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherm models (D-R). In a statistical comparison of regression values, the pseudo-second-order kinetic model and the Langmuir adsorption isotherm were found to be the best fits (R2). The results of the Langmuir isotherm study showed that the maximum adsorption capacity was 83.35mg/g under the optimal conditions of 4 pH, 0.3 g/L adsorbent dosage, 318 K temperature, and 90 minutes of contact time. More importantly, when compared to other adsorbents, the Vaucheria sp. alga used in our study showed the highest adsorption capacity when it came to the Alizarin dye. Adsorption is an endothermic, random, and spontaneous process, as evidenced by the changes in thermodynamic parameters enthalpy, entropy, and Gibbs free energy. Up to 70% of the algal biomass used as the adsorbent material could be recovered using 0.1 M HCl, and the same biomass could be used five times without significantly losing adsorption capacity. Thus, this research suggests that Vaucheria sp. biomass may be a useful biomaterial for treating synthetic wastewater containing alizarin dye.

Alizarin; Vaucheria sp.; Adsorption ; Adsorption Isotherm; Kinetics

"KINETIC, THERMODYNAMIC, AND EQUILIBRIUM STUDIES ON THE ADSORPTION OF ANTHRAQUINONE DYE ONTO VAUCHERIA SP. FROM SYNTHETIC SOLUTION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.9, Issue 11, page no.f216-f226, November-2022, Available :http://www.jetir.org/papers/JETIR2211529.pdf

"KINETIC, THERMODYNAMIC, AND EQUILIBRIUM STUDIES ON THE ADSORPTION OF ANTHRAQUINONE DYE ONTO VAUCHERIA SP. FROM SYNTHETIC SOLUTION", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.9, Issue 11, page no. ppf216-f226, November-2022, Available at : http://www.jetir.org/papers/JETIR2211529.pdf