Biosorption of methylene blue from aqueous solution by potato (Solanum tuberosum) peel: equilibrium modelling, kinetic, and thermodynamic studies

Abstract

In this study, an abundant agricultural waste, potato (Solanum tuberosum) peel, was used as a biosorbent material to test its suitability for removing a basic dye, methylene blue (basic blue 9), from aqueous solutions. The potato peel (PP) was characterized by infrared spectroscopy (FTIR), specific surface area, isoelectric potential (pH ZPC ), and scanning electron microscopy and the functional organic groups were determined by the Boehm titration method. The influence of operating conditions such as contact time, initial concentration of the dye, biosorbent dose, ionic strength, initial solution pH, temperature, and biosorbent particle size on dye removal was discussed. The results show that the increase of the initial concentration, dose of biosorbent material, and pH has a positive impact on the biosorption of dye. However, the ionic strength, the temperature, and particle size have a negative effect on the dye removal. Biosorption kinetic data obtained at different concentrations were modeled using the Lagergren's pseudo-first-order and Blanchard's pseudo-second-order kinetic models to determine the rate constants. It was found that the kinetics of the biosorption of dye closely followed the pseudosecond-order kinetic model. Equilibrium biosorption data were analyzed by four isotherms, namely the Langmuir isotherm, the Freundlich isotherm, the Elovich isotherm, and the Flory-Huggins isotherm. The equilibrium data were best represented by the Langmuir isotherm model, showing maximum monolayer biosorption capacity, q m , of 105.26 mg g −1 . It can be concluded that the PP has homogeneous surface energy. Thermodynamic parameters such as standard enthalpy change (ΔH˚), standard entropy change (ΔS˚), and standard free energy change (ΔG˚) were evaluated. The thermodynamic results suggest that the biosorption is a typical physical process, spontaneous, and exothermic in nature.

Acid Liquefaction of Potato (Solanum tuberosum) and Sweet Potato (Ipomoea batatas) Cultivars Peels – Pre-Screening of Antioxidant Activity/Total Phenolic and Sugar Contents

“…To use this waste as only livestock feed leads to the loss of raw material with considerable economic potential (Wu 2016). The main components of PPW are usually water, starch, cellulose, hemicellulose, fermentable sugars, lignin, proteins, polyphenols, and alkaloids (Izmirlioglu and Demirci 2012;Khawla et al 2014;Chintagunta et al 2016;Guechi and Hamdaoui 2016). Thus, this residue can potentially be utilized as feedstock for biorefineries and for the production of value-added products.…”

“…The waste residues resulting from the potato industry represents approximately 27% of the weight produced. Composed mostly of its peel, this waste residue causes a remarkable problem in its management, and it is necessary to find a solution to decrease its environmental impact (Schieber et al 2001;Guechi and Hamdaoui 2016). The potato industries are extensively supporting research and development activities focused on environmentally friendly and sustainable solutions.…”

Elimination of Methylene Blue by low-cost Biomaterial prepared from Local Natural Residue

“…Methylene blue has wider applications, which include coloring paper, dyeing cottons, wools and hair colorant [3]. It can cause short period of fast or rapid breathing, while oral ingestion produces a burning sensation and can cause nausea, vomiting and diarrhea [5]. The most technique used for the removal for dyes are adsorption, precipitation, ion-exchange, membrane filtration, photocatalysis, flocculation and electrochemical treatment [4].…”

Study of Adsorption Isotherms and Kinetic Models of Methylene Blue Adsorption on Moroccan Bagasse Waste

“…Owing to its non biodegradation and stability, MB can exist stably in the dye wastewater, its known strong adsorption onto solids, and it recognized usefulness in characterizing adsorptive material [8], [10], [11]. It was chosen in this study as a model compound to study the adsorption performance of dye on bagasse.…”

“…The n value indicates the degree of non-linearity between solution concentration and adsorption as follows: if n = 1, the adsorption is linear; if n < 1, the adsorption process is chemical and if n > 1, the adsorption is a favorable physical process [10]. The values of KF and 1/n can be calculated from the slopes and the intercepts of the plot of lnqe versus lnCe.…”