Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

被引:32
作者
Fellenz, N. [1 ]
Martin, P. [1 ]
Marchetti, S. [2 ]
Bengoa, F. [2 ]
机构
[1] Univ Nacl Rio Negro, CONICET, RA-8500 Viedma, Rio Negro, Argentina
[2] Univ Nacl La Plata, Dept Quim, Fac Ciencias Exactas, CONICET,CINDECA,CICPBA, RA-1900 La Plata, Buenos Aires, Argentina
关键词
Ordered mesoporous silica; Spherical particles; Amino-functionalization; Adsorption; Hexavalent chromium; MOLECULAR-SIEVES; REMOVAL; AMINE; CHROMIUM(VI); ADSORBENT; BINDING; SBA-15; REUSABILITY; STABILITY; ZEOLITES;
D O I
10.1007/s10934-015-9946-4
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
Aminopropyl-functionalized mesoporous silica spherical particles were obtained through post-synthetic route. The suitability of this material as an adsorbent for heavy metals from aqueous media was tested by Cr(VI) adsorption experiments performed at various pH conditions, chromium concentrations and time. The synthesized particles were characterized before and after functionalization by X-ray diffraction at low angles, nitrogen adsorption-desorption isotherms, infrared Fourier transform spectroscopy, scanning electron microscopy and thermogravimetric analysis. It was found that Cr(VI) adsorption occurs more efficiently in the pH range between 2 and 3. As a consequence of the nanometer scale of the particles, concentration profiles do not develop inside of them and thus there are no diffusional restrictions within the pores, leading to a higher Cr(VI) adsorption than that previously reported for similar systems. Chromium desorption for material reutilization was carried out in basic media. Results showed that the amino groups were grafted successfully without mesostructure damage. These groups are essential for the metal ion removal and no significant leaching was observed after four use/regeneration/use cycles. The batch equilibrium data fitted well the Langmuir isotherm with a maximum adsorption capacity of 87.1 mg g(-1) at 25 A degrees C. A discussion about the relationship between structure and its behavior as adsorbent, including regeneration and reusability, is given.
引用
收藏
页码:729 / 738
页数:10
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