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Indexed by:期刊论文

Date of Publication:2011-11-01

Journal:MATERIALS CHEMISTRY AND PHYSICS

Included Journals:Scopus、SCIE、EI

Volume:130

Issue:3

Page Number:993-999

ISSN No.:0254-0584

Key Words:Polymers; Chemical synthesis; Electron microscopy (TEM); Fourier transform infrared spectroscopy (FTIR); Thermogravimetric analysis (TGA); Thermodynamic properties

Abstract:A novel Fe(OH)(3)-polyacrylamide inorganic-organic hybrid polymer (FHPAM) was synthesized via free radical solution polymerization initiated by a redox initiation system ((NH4)(2)S2O8-NaHSO3) in an aqueous medium. Reaction parameters influencing the intrinsic viscosity and the yield of the hybrid polymer, such as initiator concentration, monomer mass fraction, temperature and reaction time were investigated and optimized. The results show that the maximum intrinsic viscosity and up to 94% yields of the hybrid polymer can be achieved using initiator concentration of 0.3% with acrylamide monomer mass fraction of 20% under solution polymerization at 40 degrees C for 7 h. The physicochemical properties of this hybrid flocculant were characterized with TEM, FUR spectra, TGA, and conductivity. It was found that a chemical bond exists between Fe(OH)(3) colloid and polyacrylamide chains in the FHPAM. The application of the hybrid polymer for the treatment of 2.5 g L-1 kaolin suspension indicates that it had an excellent flocculation capacity and its flocculation efficiency was much better than that of commercial available polyacrylamide (PAM) and polymeric ferric sulfate (PFS). The optimal conditions for the flocculation treatment of kaolin suspension were the FHPAM dosage of 40 mg L-1 at pH 7.0. The thermodynamic parameters for the flocculation process were calculated based on a statistical model. Interpretation of the results was given. (C) 2011 Elsevier B.V. All rights reserved.