Removal of Solophenyl Red 3BL Dye from Textile Effluents by Adsorption Using a Natural Adsorbent Oxalis pes-caprae L.

The aim of the present study was to assess the adsorption potential of a natural ad-sorbent Oxalis pes-caprae L. for the removal of azo-dye solophenyl red 3BL (SR 3BL) from textile effluents. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The effect of various parameters on the efficiency of the adsorption was studied. The optimum was found with the contact time of 35 minutes, pH of 6, and temperature of 25 degrees C. The equilibrium ex-perimental data were fitted with the Langmuir, Freundlich, and Temkin models. Experi-mental data were well described with the Langmuir isotherm indicating monolayer ad-sorption. Pseudo-first-order, pseudo-second-order, and Elovich kinetic models were used to evaluate the adsorption kinetics. The adsorption kinetics was found to follow closely the pseudo-first-order kinetic model. Thermodynamics studies revealed that the adsorp-tion process was spontaneous and exothermic.

Automated summary

The aim of this study was to evaluate the adsorption potential of Oxalis pes-caprae L. as a natural adsorbent for the removal of SR 3BL from textile effluents. The adsorbent was characterized using FTIR and SEM. The study investigated the effect of various parameters on adsorption efficiency and found that the optimum conditions were a contact time of 35 minutes, pH of 6, and temperature of 25 degrees C. Experimental data fitting and kinetic modeling revealed that the adsorption followed the Langmuir isotherm and the pseudo-first-order kinetic model, respectively. Thermodynamic studies indicated that the adsorption process was spontaneous and exothermic.