Removal of rhodamine B cationic dye using activated carbon
by Ana Lúcia Denardin Da Rosa; André Azevedo Machado; Calina Grazielli Dias Barros; Elvis Carissimi; Dison Stracke Pfingsten Franco; Guilherme Luiz Dotto
International Journal of Environment and Waste Management (IJEWM), Vol. 28, No. 3, 2021

Abstract: The optimum conditions for the removal of rhodamine B (RhB) dye present in wastewater was tested using commercial activated carbon (AC). Adsorption tests were carried out in order to evaluate the effects of pH, contact time and temperature; the kinetics of adsorption was studied for dye concentrations ranging from 20 to 500 mg L⁻¹ using pseudo-first order and pseudo-second order models. Equilibrium isotherms were analysed using Langmuir, Freundlich, and Sips models. Results showed that the AC had the highest adsorption capacity at pH 8.0 and a temperature of 25°C. The kinetic model that better fit the experimental data was pseudo-second order. The Sips isotherm showed the best performance and the adsorption capacity values were 147.58, 140.01, and 137.27 mg g⁻¹ for the temperatures of 25, 35 and 45°C, respectively. Results indicated that adsorption using activated carbon has great potential for rhodamine B removal from effluents generated during stone dyeing processes.

Online publication date: Mon, 25-Oct-2021

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