Potentiality of banana peel for removal of Congo red dye from aqueous solution: isotherm, kinetics and thermodynamics studies

Abstract

Potentiality of fruit peel (banana peel) was evaluated by adsorption of Congo red (CR) dye from aqueous solution. The adsorption study was performed by varying operating variables such as pH, initial concentration of CR, adsorbent dose, contact time and temperature. The dust of banana peel was characterized by different instrumental techniques such as point of zero charge, scanning electron microscopy and Fourier transformed infrared spectroscopy. The results revealed that the dye adsorption is favorable at higher pH (10). The equilibrium of dye adsorption was assessed by Freundlich and Langmuir isotherm models. Similarly, kinetics of CR adsorptions was assessed by pseudo-first-order and pseudo-second-order kinetics. Results revealed that isotherm and kinetics of dye adsorption fit well with Langmuir isotherm and pseudo-second-order kinetics, respectively. The dye adsorption capacity was recorded as 1.727 mg/g. The thermodynamics of the dye adsorption revealed that the adsorption is thermodynamically favorable, spontaneous and exothermic in nature. The regeneration study suggested that 97.3% dye removal can be achieved by regenerating the spent adsorbent with 0.1 N NaOH solution. Finally, it can be concluded that banana peel could be an efficient adsorbent for removal of Congo red from aqueous medium.

Adsorptive removal of malachite green dye from aqueous solution onto activated carbon of Catha edulis stem as a low cost bio-adsorbent

“…As a result, the remaining vacant surface sites are difficult to be occupied due to the formation of repulsive force between the adsorbate (MG) on the solid surface of adsorbent with adsorbate (MG) on the bulk phase (solutions) as well as the saturation of active site of the adsorbent. This trend was observed by different scholar's findings and reported in different literatures (Mondal and Kar, 2018;Rahmat et al, 2016). The removal efficiency was found to be at the range of 64.1 to 98.8 % when the time rises from 10 to 60 minute respectively.…”

“…As increase the initial concentration of the dye from 10 mg/L to 50 mg/L, resulted an increase in adsorption capacity (qe) from 0.988 to 4.55 mg/g. The increase in the initial concentration of the dye enhances the interaction between the dye molecules and the surface of the adsorbent (Ai et al, 2011;Lee et al, 2019;Mondal and Kar, 2018) .This results can also observed with different scholars finding and reported in different literatures (Mondal and Kar, 2018;Raval et al, 2016) .…”

Physical-chemical characterization of metal hydroxides sludge waste obtained from electrocoagulation processes and its application as adsorbent for organic pollutants removal in aqueous solution

“…This similarity between the theoretical and experimental values confirms the correlation between the adsorption results with the kinetic model of pseudo-secondorder of Lagergren, suggesting, a chemisorption process between the EMHS and the CR presented in this work. Similar phenomena have been observed for CR adsorption on banana peel dust (0.749 mg g -1 ) [33], coir pith carbon (6.70 mg g -1 ) [3], anion exchange membranes (11.01 mg g -1 ) [34] and anilinepropylsilica xerogel (22.62 mg g -1 ) [35].…”

Potentiality of mosambi (Citrus limetta) peel dust toward removal of Cr(VI) from aqueous solution: an optimization study

“…After carrying out all the optimum experimental condition, adsorbents were filtered and dried at normal room temperature and finally analyzed their characteristics (Mondal and Kar 2018).…”