Ashish S. Sartape

Removal of Bi (III) with Adsorption Technique Using Coconut Shell Activated Carbon

Abstract In present study, we report the preparation of coconut shell activated carbon as adsorbent and its application for Bi (III) removal from aqueous solutions. The developed adsorbent was characterized with scanning electron microscope (SEM), Fourier Transform Infrared (FTIR), C, H, N, S analyzer, and BET surface area analyzer. The parameters examined include agitation time, initial concentration of Bi (III), adsorbent dose and temperature. The maximum adsorption of Bi (III) (98.72%) was observed at 250 mg·L−1 of Bi (III) and adsorbent dose of 0.7 g when agitation was at 160 r·min−1 for 240 min at (299±2) K. The thermodynamic parameters such as Gibbs free energy (ΔGθ), enthalpy (ΔHθ) and entropy (ΔSθ) were evaluated. For the isotherm models applied to adsorption study, the Langmuir isotherm model fits better than the Freundlich isotherm. The maximum adsorption capacity from the Langmuir isotherm was 54.35 mg·g−1 of Bi (III). The kinetic study of the adsorption shows that the pseudo second order model is more appropriate than the pseudo first order model. The result shows that, coconut shell activated carbon is an effective adsorbent to remove Bi (III) from aqueous solutions with good adsorption capacity.

Kinetic and equilibrium studies of the adsorption of Cd(II) from aqueous solutions by wood apple shell activated carbon

abstract The use of heavy metals along with the associate risks of metal pollution has increased to a great extent over the recent times. Cadmium is one of the most harmful toxic metals. In present study, with the economical and efficient adsorbent, wood apple shell activated carbon (WASAC), removal of the Cd(II) ions was investigated. The WASAC was characterized with modern techniques. Among them, Energy-dispersive X-ray spectroscopy (EDAX) was used to observe the adsorption of Cd(II) on WASAC. The effects of pH, temperature, contact time, initial Cd(II) concentration, and adsorbent dosage on the adsorption yield were studied. The adsorbent exhibited good sorption potential for cadmium at pH 6.5. Langmuir and Freundlich isotherms were used to interpret the adsorption data of the investigated systems. The Langmuir model resulted in the best fit and WASAC had 27.64 mg/g as maximum adsorption capacity for Cd(II). The sorption kinetics of cadmium has been analyzed by Lagergren pseudo-first-order and pseudo-s...

Mahogany fruit shell: a new low-cost adsorbent for removal of methylene blue dye from aqueous solutions

AbstractIn the present study, we have introduced a new effective and economical adsorbent, Mahogany fruit shell. This adsorbent has porous nature and essential active groups are present on their surfaces which enhance its capability of adsorption. Developed adsorbent was characterized with Fourier transform infrared spectroscopy, scanning electron microscopy, etc. techniques which also support to confirm successful adsorption. In the present study, batch adsorption experiments were carried out as a function of pH, contact period, dye concentration, adsorbent dosage, etc. for maximum removal of methylene blue, a basic dye from aqueous solution. Mahogany fruit shell adsorbent had succeeded to remove basic dye up to 99.05% at pH 9. The experimental data are fitted well to the Langmuir adsorption isotherm. Thermodynamic parameters such as (ΔG°), (ΔH°), and (ΔS°) were calculated, which indicated that the adsorption is spontaneous and endothermic in nature. The Mahogany fruit shell had showed great adsorption c...