Chemically oxidized pineapple fruit peel for the biosorption of heavy metals from aqueous solutions

Abstract

A B S T R A C TChemically oxidized pineapple fruit peel biomass has been used as a biosorbent for Cd(II) and Pb(II) removal from aqueous solutions. Fourier transform infrared spectroscopy and scanning electron microscopy techniques were used to characterize the treated pineapple fruit peel. The biosorption efficiency of pineapple fruit peel for Cd(II) and Pb(II) was greatly enhanced after chemical oxidation probably due to introduction of carboxylic and hydroxyl groups onto the biosorbent surface. Biosorption kinetics for both metals was well described by pseudo-second-order kinetic equation and intraparticle film diffusion. Langmuir, Freundlich, and Temkin isotherm models were applied to the biosorption equilibrium data and best results were obtained with Langmuir isotherm model. Maximum monolayer biosorption capacity was found to be 42.10 and 28.55 mg g −1 for Cd(II) and Pb(II), respectively. Thermodynamic study indicates that the biosorption was exothermic and the spontaneity of the process decreases with the increase in solution temperature.

Adsorption of Rhodamine B dye from aqueous solution onto acid treated banana peel: Response surface methodology, kinetics and isotherm studies

“…Potassium permanganate (KMnO 4 ) was applied to further oxidize the adsorbent surface. For this step, 100 g of treated banana powder was soaked in 1 L of 0.1 N KMnO 4 for 24 hours [33], after which the sample was washed using demineralized water until the pH became neutral. After that, the pretreated banana peel adsorbent was oven dried at 80°C for 24 hrs and kept in airtight plastic bottles labeled according to the sizes.…”

Optimization of Process Parameters by Response Surface Methodology for Methylene Blue Removal Using Cellulose Dusts

“…The crystal size of cellulose based on the Debeye-Scherrer formula was found to be around 56 nm in accordance with FWHM which stands for full width at half-maximum of the (002) peak [32]. FTIR Spectrum of CD before and after adsorption of MB in the range of 650-4000 cm-1 ( Figure 5) exhibits characteristic peaks appeared at 3300 cm-1 because of O-H group (carboxylic acids, phenols and alcohols) on the surface of adsorbent as in cellulose, pectin and lignin [33,34]. While the peak at 2900 cm-1 representing Carbon-Hydrogen distortion in in biomass structure (cellulose, hemicellulose, lignin) [35].…”

Utilization of agricultural waste adsorbent for the removal of lead ions from aqueous solutions

“…Adsorbents could be obtained from different sources, such as naturally occurring, agricultural biomass and waste materials [13][14][15]. In order to minimize the wastewater treatment costs and avoid the accumulation of solid waste in the environment, agricultural wastes have been suggested and studied, such as pineapple stem [16], pineapple fruit peel [17], waste tea [18], walnut shell [19], peanut shell [20] and seed pod [21]. Moreover, onion skins are abundantly available and can be a good source of electrostatically active metal oxides [22].…”