Valorization of Inga feuilleei (Pacay) Seeds as a Promising Adsorbent for the Removal of Direct Red 80 Dye in Aqueous Solution—Kinetics, Isotherms, Thermodynamics, and Techno-Economic Analysis

Gonzales-Condori E.G.; Sotomayor-Asencio M.L.; Mayhuire-Centeno M.F.; Paz-Corrales O.A.; Gonzales-Condori J.; Villanueva-Salas J.A. · Processes (2026) · DOI: 10.3390/pr14060968

Resumen

Textile wastewater pollution is a global issue that requires attention due to its potential negative environmental impacts. Therefore, in the present investigation, Inga feuilleei seed (IFS) powder was used as a potential adsorbent of Direct Red 80 (DR80) dye in synthetic water. The results showed that the highest removal efficiency was achieved at pH = 2 and an IFS powder particle size of 150 μm. ART-FTIR analysis of IFS dust showed the presence of -OH, C=C, and C-H groups. The kinetic study revealed a better fit of the experimental adsorption data to the pseudo-second-order kinetics, suggesting that the mechanism governing the adsorption process is chemisorption. The maximum adsorption capacity of DR80 on IFS powder was 133.11, 146.78, 152.78, and 183.51 mg/g at 20, 30, 40, and 50 °C, respectively. According to the thermodynamic study, the process is endothermic and spontaneous. Finally, the use of IFS powder is a cost-effective alternative since the project approach for the development of the production process of this adsorbent is feasible and profitable. In conclusion, IFS powder is a cost-effective adsorbent for removing DR80 in water, and the process could be scaled up in removal studies on textile wastewater.

Instituciones: Universidad Tecnológica del Perú; Universidad Católica de Santa María