Removal of Procion Red dye from colored effluents using H 2 SO 4 -/HNO 3 -treated avocado shells (Persea americana) as adsorbent

Jordana Georgin, Bianca da Silva Marques, Julia da Silveira Salla, Edson Luiz Foletto, Daniel Allasia, Guilherme Luiz Dotto
Environmental Science and Pollution Research International 2018, 25 (7): 6429-6442
The treatment of colored effluents containing Procion Red dye (PR) was investigated using H2 SO4 and HNO3 modified avocado shells (Persea americana) as adsorbents. The adsorbent materials (AS-H2 SO4 and AS-HNO3 ) were properly characterized. The adsorption study was carried out considering the effects of adsorbent dosage and pH. Kinetic, equilibrium, and thermodynamic aspects were also evaluated. Finally, the adsorbents were tested to treat simulated dye house effluents. For both materials, the adsorption was favored using 0.300 g L-1 of adsorbent at pH 6.5, where, more than 90% of PR was removed from the solution. General order model was able to explain the adsorption kinetics for both adsorbents. The Sips model was adequate to represent the isotherm data, being the maximum adsorption capacities of 167.0 and 212.6 mg g-1 for AS-H2 SO4 and AS-HNO3 , respectively. The adsorption processes were thermodynamically spontaneous, favorable (- 17.0 < ΔG 0  < - 13.2 kJ mol-1 ), and exothermic (ΔH 0 values of - 29 and - 55 kJ mol-1 ). AS-H2 SO4 and AS-HNO3 were adequate to treat dye house effluents, attaining color removal percentages of 82 and 75%. Avocado shells, after a simple acid treatment, can be a low-cost option to treat colored effluents.


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