화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.36, No.5, 688-700, May, 2019
DOI10.1007/s11814-019-0262-6  Export Citation
Removal of cadmium from aqueous solutions using inorganic porous nanocomposites
Catalin Ianasi1, Mirela Piciorus1, Roxana Nicola1, Mihaela Ciopec2, Adina Negrea2, Daniel Niznansky3, Adel Len4, Laszlo Almasy5, 6, and Ana-Maria Putz1, †
  • 1Coriolan Dragulescu Institute of Chemistry, Bv. Mihai Viteazul, No. 24, RO-300223, Timisoara, Romania
  • 2Faculty of Industrial Chemistry and Environmental Engineering, Politehnica University of Timisoara, Vasile Parvan Bd., No. 6, 300223, Timisoara, Romania
  • 3Faculty of Science, Charles University in Prague, Albertov 6, 128 43, Prague, Czech Republic
  • 4Centre for Energy Research, Hungarian Academy of Sciences, POB 49 Budapest 1525, Hungary
  • 5Wigner Research Centre for Physics, Institute for Solid State Physics and Optics, Hungarian Academy of Sciences, POB 49 Budapest 1525, Hungary
  • 6State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China
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The present paper reports a one-pot synthesis of magnetic nanocomposites samples through acid catalyzed sol-gel method. Fe(III) acetylacetonate was used as precursor of the iron oxide phase: tetraethylortosilicate for the silica phase and polyvinyl alcohol (PVA, molecular mass 49000) as pore former. Different concentrations of Fe2O3 in composites matrices were prepared and studied ranging from 0% to 20%. All reactions took place in one pot at room temperature; the materials were subsequently heat treated at 300 oC, to ensure the crystallinity for the iron oxide having spinel structure, forming nanoparticles confined in the silica matrix. The materials were characterized using X-ray diffraction, small-angle neutron scattering, FT-IR spectroscopy, nitrogen adsorption, Mossbauer spectroscopy and magnetization measurements. The maximum value of room temperature saturation magnetization of ~54 emu/g and 0.11 kOe coercive field was achieved for the magnetic nanocomposite sample with 20% Fe2O3. The highest surface area of 680m2/g was obtained for the sample with 10% Fe2O3. The potential applicability of the obtained materials was studied for adsorption performance for cadmium in aqueous solutions. The Langmuir isotherm model described well the adsorption data, indicating monolayer adsorption of Cd(II) on the heterogeneous composite surface.
Keywords:Adsorption;Cadmium;Sol-gel;PVA;Iron Oxide
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