title: Extractive fixed-site polymer sorbent for selective boron removal from natural water.
abstract: Water contamination by boron is a widespread environmental problem. The World Health Organization (WHO) recommends maximum boron concentration of 2.4 mg L(-1) for drinking water. The paper presents a simple method for preparation of functionalized sheet sorbent for selective extraction of boron from natural water. The pores of commercially available poly(propylene) membrane were functionalized by room temperature in situ crosslinking of poly(vinylbenzyl chloride) with a cyclic diamine piperazine. The precursor membranes were chemically modified with N-methyl D-glucamine which is selective for boron. Characterization of membrane was carried out using scanning electron microscopy (SEM) and attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR) techniques. The functionalized membrane has been characterized in terms of parameters that influence the sorption of boron from aqueous streams like pH, uptake capacity, contact time, effects of competing ions and reusability. The maximum boron sorption capacity determined experimentally was 28 mg g(-1). The studies showed that trace concentrations of boron were quantitatively removed from water at neutral pH. The developed fixed site polymer sorbent exhibited high sorption capacity and fast kinetics as compared to various sorbents reported in literature. It was successfully applied for the removal of boron from ground water and seawater samples in presence of high concentration of interfering ions.
authors.affiliation: Analytical Chemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: Neha
authors.initials: N
authors.lastname: Thakur
authors.forename: Sanjukta A
authors.initials: SA
authors.lastname: Kumar
authors.forename: Rakesh N
authors.initials: RN
authors.lastname: Shinde
authors.forename: Ashok K
authors.initials: AK
authors.lastname: Pandey
authors.forename: Sangita D
authors.initials: SD
authors.lastname: Kumar
authors.forename: A V R
authors.initials: AV
authors.lastname: Reddy
mesh_terms: D000327:Adsorption; D000588:Amines / Q000737:chemistry; D000838:Anions; D001895:Boron / Q000032:analysis* / Q000737:chemistry; D060587:Groundwater; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007700:Kinetics; D008422:Materials Testing; D008536:Meglumine / Q000737:chemistry*; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D011108:Polymers / Q000737:chemistry*; D011126:Polypropylenes / Q000737:chemistry; D011145:Polyvinyls; D016062:Porosity; D012623:Seawater; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D000588:Amines; D000838:Anions; D007477:Ions; D011108:Polymers; D011126:Polypropylenes; D011145:Polyvinyls; D014874:Water Pollutants, Chemical; D008536:Meglumine; C080604:polyvinylbenzyl chloride; D001895:Boron
keywords: Boron sorption; Functionalized poly(propylene) membrane; Groundwater; Poly(vinylbenzylchloride); Preconcentration; Seawater