title: Preparation of xanthated bentonite and its removal behavior for Pb(II) ions.
abstract: Xanthate was successfully grafted onto bentonite by a relatively simple solution reaction. The obtained xanthated bentonite (XBent) was characterized by FT-IR spectrophotometer, thermogravimetric analysis (TG), particle size analysis, x-ray diffraction (XRD) and scanning electron microscopy (SEM). XBent acting as a type of environmentally friendly adsorbent was applied to remove lead ions from aqueous solutions. The optimum conditions were as follows: [Pb(2+)] = 500 mg L(-1), [XBent] = 2 g L(-1), pH = 5.0; oscillating 60 min under 200 rpm at 25 degrees C. The removal rate of lead was up to 99.9%. It was found that the lead(II) ions-XBent adsorption isotherm model fitted well to the Freundlich isotherm. The adsorption mechanism was also investigated by SEM and XRD, which concluded that lead ions were complexed or chelated with XBent. XBent appears to have potential to be used later in water treatment as a type of inorganic polymer reagent.
authors.affiliation: Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, Key Laboratory of Polymer Materials of Gansu Province, College of Chemistry & Chemical Engineering, Northwest Normal University, Lanzhou 730070, China.
authors.forename: Y F
authors.initials: YF
authors.lastname: He
authors.forename: F R
authors.initials: FR
authors.lastname: Li
authors.forename: R M
authors.initials: RM
authors.lastname: Wang
authors.forename: F Y
authors.initials: FY
authors.lastname: Li
authors.forename: Y
authors.initials: Y
authors.lastname: Wang
authors.forename: Z H
authors.initials: ZH
authors.lastname: Zhang
mesh_terms: D000327:Adsorption; D001546:Bentonite / Q000737:chemistry*; D002614:Chelating Agents / Q000494:pharmacology; D004566:Electrodes; D006863:Hydrogen-Ion Concentration; D007477:Ions; D007854:Lead / Q000737:chemistry / Q000302:isolation & purification*; D008855:Microscopy, Electron, Scanning / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D013818:Thermogravimetry / Q000379:methods; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000302:isolation & purification; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction / Q000379:methods; D044004:Xanthones / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D007477:Ions; D014874:Water Pollutants, Chemical; D044004:Xanthones; D001546:Bentonite; D007854:Lead