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Biosorption of Pb(II) ions onto Cocos nucifera leaf powder: Application of response surface methodology
Author(s) -
Darla Hymavathi,
Garimella Prabhakar
Publication year - 2019
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.12945
Subject(s) - biosorption , adsorption , endothermic process , fourier transform infrared spectroscopy , cocos nucifera , aqueous solution , nuclear chemistry , metal ions in aqueous solution , scanning electron microscope , response surface methodology , freundlich equation , chemistry , factorial experiment , fractional factorial design , metal , analytical chemistry (journal) , materials science , chromatography , chemical engineering , botany , sorption , mathematics , organic chemistry , biology , composite material , statistics , engineering
This article presents the outcome obtained when Cocos nucifera leaf powder is used for the adsorptive removal of Pb(II) from aqueous solutions. A 2 4 full‐factorial design with six center points and eight axial points leading to 30 experimental run, as indicated by Design Expert version 10.0.03 is followed. Surface response analysis is carried out to understand the interactions among the contributing variables—metal ion concentration, initial solution pH, sorbent dosage, and temperature in the removal of metal ions. A 20 mg/L of Pb(II) solution, treated with 25 g/L of adsorbent at a pH of 5.0 and 303 K yielded 97.68% removal of Pb(II). Adsorption equilibrium is as per Freundlich isotherm model and the kinetics are represented by a pseudo second‐order expression with a regression coefficient of 0.999. The maximum biosorption capacity of Cocos nucifera leaf powder is 8.475 mg/g. Thermodynamic analysis suggests that the adsorption is endothermic and spontaneous in nature. Surface morphology of the adsorbent is studied using Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy‐Energy Dispersive Analysis System (SEM‐EDAX). © 2018 American Institute of Chemical Engineers Environ Prog, 38: S118–S127, 2019