Removal of Azo Dyes from Water Using Natural Luffa cylindrica as a Non-Conventional Adsorbent
2024
Ma. Guadalupe Aranda-Figueroa | Adriana Rodríguez-Torres | Alexis Rodríguez | Gloria Ivette Bolio-López | David Osvaldo Salinas-Sánchez | Dulce Ma. Arias-Atayde | Rosenberg J. Romero | Maria Guadalupe Valladares-Cisneros
Reducing high concentrations of pollutants such as heavy metals, pesticides, drugs, and dyes from water is an emerging necessity. We evaluated the use of Luffa cylindrica (Lc) as a natural non-conventional adsorbent to remove azo dye mixture (ADM) from water. The capacity of Lc at three different doses (2.5, 5.0, and 10.0 g/L) was evaluated using three concentrations of azo dyes (0.125, 0.250, and 0.500 g/L). The removal percent (R%), maximum adsorption capacity (Qm), isotherm and kinetics adsorption models, and pH influence were evaluated, and Fourier-transform infrared spectroscopy and scanning electron microscopy were performed. The maximum R% was 70.8% for 10.0 g L&minus:1 :Lc and 0.125 g L&minus:1 ADM. The Qm of Lc was 161.29 mg g&minus:1. Adsorption by Lc obeys a Langmuir isotherm and occurs through the pseudo-second-order kinetic model. Statistical analysis showed that the adsorbent dose, the azo dye concentration, and contact time significantly influenced R% and the adsorption capacity. These findings indicate that Lc could be used as a natural non-conventional adsorbent to reduce ADM in water, and it has a potential application in the pretreatment of wastewaters.
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