Adsorption of zinc by biogenic elemental selenium nanoparticles

被引:100
|
作者
Jain, Rohan [1 ,4 ]
Jordan, Norbert [2 ]
Schild, Dieter [3 ]
van Hullebusch, Eric D. [4 ]
Weiss, Stephan [2 ]
Franzen, Carola [2 ]
Farges, Francois [5 ,6 ]
Huebner, Rene [7 ]
Lens, Piet N. L. [1 ]
机构
[1] UNESCO IHE, Inst Water Educ, NL-2611 AX Delft, Netherlands
[2] Helmholtz Zentrum Dresden Rossendorf eV, Inst Resource Ecol, D-01328 Dresden, Germany
[3] Karlsruhe Inst Technol, Inst Nucl Waste Disposal, D-76344 Eggenstein Leopoldshafen, Germany
[4] Univ Paris Est, UPEMLV, Lab Geomat & Environm EA 4508, F-77454 Marne La Vallee, France
[5] Univ Paris 06, Museum Natl Hist Nat, IMPMC, Paris, France
[6] CNRS, UMR 7590, Paris, France
[7] Helmholtz Zentrum Dresden Rossendorf eV, Inst Ion Beam Phys & Mat Res, D-01328 Dresden, Germany
关键词
Adsorption; Selenium nanoparticles; Zinc removal; XPS analysis; zeta-Potential; Colloidal stability; EXTRACELLULAR BIOSYNTHESIS; AQUEOUS-SOLUTIONS; METAL-IONS; REMOVAL; NANOSPHERES; SORPTION; ZN2+; SE; NANOMATERIAL; CAPTURE;
D O I
10.1016/j.cej.2014.09.057
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The adsorption of Zn2+ ions onto biogenic elemental selenium nanoparticles (BioSeNPs) was investigated. BioSeNPs were produced by reduction of selenite (SeO32-) in the presence of anaerobic granules from a full scale upflow anaerobic sludge blanket (UASB) reactor treating paper mill wastewater. The BioSeNPs have an iso-electric point at pH 3.8 at 5 mM background electrolyte concentration. X-ray photoelectron spectroscopy showed the presence of a layer of extracellular polymeric substances on the surface of BioSeNPs providing colloidal stability. Batch adsorption experiments showed that the uptake of Zn2+ ions by BioSeNPs was fast and occurred at a pH as low as 3.9. The maximum adsorption capacity observed was 60 mg of zinc adsorbed per g of BioSeNPs. The Zn2+ ions adsorption on the BioSeNPs was largely unaffected by the presence of Na+ and Mg2+, but was impacted by the presence of Ca2+ and Fe2+ ions. The colloidal stability of BioSeNPs decreased with the increasing Zn2+ ions loading on BioSeNPs (increase in mg of zinc adsorbed per g of BioSeNPs), corresponding to the neutralization of the negative surface charge of the BioSeNPs, suggesting gravity settling as a technique for solid liquid separation after adsorption. This study proposes a novel technology for removal of divalent cationic heavy metals by their adsorption on the BioSeNPs present in the effluent of an UASB reactor treating selenium oxyanions containing wastewaters. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码:855 / 863
页数:9
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