Removal of fluoride from an aqueous solution by batch and column process using activated carbon derived from iron infused Pisum sativum peel: characterization, Isotherm, kinetics study

Abstract

The present study investigated the adsorption efficiency of magnetic activated carbon was synthesized by waste biomass of Pisum sativum (peel) and pyrolysis at 500˚C temperature (MPPAC-500). Derived activated carbon was applied for removal of fluoride from aqueous solution. The MPPAC-500 was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), zeta potential, X-ray Diffraction (XRD) and Particle Size Analyser. The fluoride sequestration study was performed in both batch and column systems. The batch adsorption study was focused on parameter like, adsorbent dose, contact time, pH and initial fluoride concentrations. The maximum capacity of fluoride removal was qo = 4.71 (mg/g). Freundlich isotherm model (R2 -0.995) obeyed better than Langmuir (R<sup>2</sup> -0.979) model. The RL values observed between 0-1 (RL-0.057) inferred the favourable adsorption. Pseudo-second-order model favoured well than pseudo-first-order in the whole experimental data. In case of column study was performed at two different bed height 5 cm and 10 cm having flow rate of 5 mL/min as well as 10 mL/min. The breakthrough curve and column data were interpreted by Thomas, Adams-Bohart, Yoon-Nelson and Clark model. These finding showed that MPPAC-500 has potential adsorptive capacity for fluoride removal from aqueous solutions in batch and column systems.

Fluoride Adsorption from Aqueous Solution by Modified Zeolite—Kinetic and Isotherm Studies

“…The negative values of the free enthalpy ΔG° indicate that the adsorption of fluoride ions on the modified zeolite is a spontaneous process [ 17 , 54 , 55 ]. The decrease of ΔG° with increasing temperature is another parameter that indicates the adsorption takes place without additional outputs.…”

Comparison of Modified Peels: Natural Peels or Peels-Based Activated Carbons for the Removal of Several Pollutants Found in Wastewaters

“…To face the threat of As (III) and As (V), Sahu et al suggested the use of magnetized carbon-based adsorbents with AC derived from pea peels [60]. The activation was physically carried out by pyrolysis at 500 • C (MPAC-500) and 600 • C (MPAC-600), with the latter having the better results.…”

“…Pea Peel AC Sahu et al examined the removal of fluoride from an aqueous solution by both batch and column experiments with activated carbon derived from pea peels, activated by FeCl 3 and pyrolysis[60]. The efficiency of MPPAC-500 was evaluated by the study of the effects of temperature, kinetics, and pH, and the material was characterized.…”

Engineered Magnetic Carbon-Based Adsorbents for the Removal of Water Priority Pollutants: An Overview

“…Sahu et al [164] evaluated the fluoride adsorption with a magnetic AC prepared using pea peel biomass impregnated with FeCl 3 and pyrolyzed at 500 °C. Fluoride removal tests were performed with column and agitated tank modes.…”