title: Effective removal of mercury(II) ions from chlor-alkali industrial wastewater using 2-mercaptobenzamide modified itaconic acid-grafted-magnetite nanocellulose composite.
abstract: A novel adsorbent, 2-mercaptobenzamide modified itaconic acid-grafted-magnetite nanocellulose composite [P(MB-IA)-g-MNCC] was synthesized for adsorbing mercury(II) [Hg(II)] ions selectively from aqueous solutions. Fourier transforms infrared spectroscopy, X-ray diffraction, scanning electron microscopy and thermogravimetric studies were performed to characterize the adsorbent. The optimum pH for Hg(II) adsorption was found to be 8.0, and the adsorption attained equilibrium within 60 min. The kinetic data were found to follow pseudo-second-order which assumes the ion exchange followed by complexation mechanism. The temperature dependence indicates an exothermic process. The well agreement of equilibrium data with Freundlich adsorption model confirms the multilayer coverage of Hg(II) onto P(MB-IA)-g-MNCC. The maximum adsorption capacity was found to be 240.0 mg/g. Complete removal of Hg(II) from aqueous solution was possible with an adsorbent dosage of 2.0 g/L. Spent adsorbent was effectively degenerated with 0.1M HCl. The present investigation shows that P(MB-IA)g-MNCC is a promising adsorbent for the removal and recovery of Hg(II) ions from aqueous solutions.
authors.affiliation: Department of Chemistry, School of Physical and Mathematical Sciences, University of Kerala, Kariavattom, Trivandrum 695 581, India. Electronic address: tsani@rediffmail.com.
authors.forename: T S
authors.initials: TS
authors.lastname: Anirudhan
authors.affiliation: Department of Chemistry, School of Physical and Mathematical Sciences, University of Kerala, Kariavattom, Trivandrum 695 581, India.
authors.forename: F
authors.initials: F
authors.lastname: Shainy
mesh_terms: D000327:Adsorption; D001562:Benzimidazoles / Q000737:chemistry*; D002482:Cellulose / Q000737:chemistry*; D005609:Free Radicals; D006863:Hydrogen-Ion Concentration; D007474:Ion Exchange; D007477:Ions / Q000737:chemistry*; D007700:Kinetics; D058185:Magnetite Nanoparticles / Q000737:chemistry; D008628:Mercury / Q000032:analysis*; D008855:Microscopy, Electron, Scanning; D053761:Nanocomposites / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D055672:Static Electricity; D013386:Succinates / Q000737:chemistry*; D013696:Temperature; D013816:Thermodynamics; D013818:Thermogravimetry; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
chemical_list: D001562:Benzimidazoles; D002482:Cellulose; D005609:Free Radicals; D007477:Ions; D058185:Magnetite Nanoparticles; D008628:Mercury; D013386:Succinates; D062065:Wastewater; D014874:Water Pollutants, Chemical; C030698:2-mercaptobenzimidazole; C005229:itaconic acid
keywords: Adsorption kinetics; Desorption; Graft co-polymerization; Isotherm; Magnetite nanocellulose; Nanocellulose