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Design, characterization and evaluation of hydroxyethylcellulose based novel regenerable supersorbent for heavy metal ions uptake and competitive adsorption

Abbas, Azhar, Hussain, Muhammad Ajaz, Sher, Muhammad, Irfan, Muhammad Imran, Tahir, Muhammad Nawaz, Tremel, Wolfgang, Hussain, Syed Zajif, Hussain, Irshad
International journal of biological macromolecules 2017 v.102 pp. 170-180
Fourier transform infrared spectroscopy, adsorption, aqueous solutions, chromium, cobalt, copper, energy-dispersive X-ray analysis, heat production, heavy metals, ion exchange, lead, metal ions, models, nickel, nuclear magnetic resonance spectroscopy, radioactive waste, scanning electron microscopy, sorbents, sorption isotherms, wastewater
Hydroxyethylcellulose succinate-Na (HEC-Suc-Na) was designed and evaluated for removal of some heavy metal ions from aqueous solution. Pristine sorbent HEC-Suc-Na was thoroughly characterized by FTIR and solid-state CP/MAS 13C NMR spectroscopy, SEM-EDS and zero point charge analyses. Langmuir isotherm, pseudo second order kinetic and ion exchange models provided best fit to the experimental data of sorption of metal ions. Maximum sorption capacities of supersorbent HEC-Suc-Na for sorption of heavy metal ions from aqueous solution as calculated by Langmuir isotherm model were found to be 1000, 909.09, 666.6, 588 and 500mgg−1 for Pb(II), Cr(VI), Co(II), Cu(II) and Ni(II), respectively. Competitive sorption of these heavy metal ions was carried out from galvanic and nuclear waste water simulated environment. The negative values of ΔG° and ΔH° indicated spontaneity and exothermic nature of sorption. The sorbent was efficiently regenerated with no significant decrease in sorption capacity after five cycles.