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动态条件下壳聚糖稳定纳米铁去除水体中Cr(Ⅵ)的研究

Keywords: 壳聚糖,纳米铁,六价铬Cr(Ⅵ)

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Abstract:

以重金属Cr(Ⅵ)为目标污染物,在两种实验条件下(实验柱Ⅰ为模拟污染水样,实验柱Ⅱ为实际污染水样)考察了壳聚糖稳定纳米铁对Cr(Ⅵ)的去除能力。实验柱Ⅰ和实验柱Ⅱ分别在第160PV和127PV时发生了击穿效应。与实验柱Ⅰ相比,实验柱Ⅱ中壳聚糖稳定纳米铁对Cr(Ⅵ)的去除能力降低了25%。SEM表征显示,实验柱Ⅱ中壳聚糖稳定纳米铁的表面形成了许多葡萄状晶体,它们的存在导致实验柱Ⅱ中纳米铁的去除能力明显低于实验柱Ⅰ。XPS表征显示,由于Ca和Mg的氢氧化物替代了部分铁氢氧化物,导致实验柱Ⅱ中壳聚糖稳定纳米铁表面Fe原子的相对含量低于实验柱I。Cr元素高分辨率XPS能谱分析显示,在实验柱Ⅰ的条件下Cr(Ⅵ)被还原得更充分,而且在两种实验条件下都有部分Cr(Ⅵ)被吸附在纳米铁表面最终没有被零价铁所还原。

References

[1]  Cao J;Zhang W X,Stabilization of chromium ore processing residue (COPR) with nanoscale iron particles,Journal of Hazardous Materials? ,2006, 132(2-3).
[2]  Geng, B ;Jin, ZH ;Li, TL ;Qi, XH,Preparation of chitosan-stabilized Fe-0 nanoparticles for removal of hexavalent chromium in water,Science of the Total Environment?,2009, 407(18).
[3]  Bing Geng ;Zhaohui Jin ;Tielong Li ;Xinhua Qi,Kinetics of hexavalent chromium removal from water by chitosan-Fe~0 nanoparticles,Chemosphere?,2009, 75(6).
[4]  Xu Y;Zhao D,Reductive immobilization of chromate in water and soil using stabilized iron nanoparticles,Water Research,2007.
[5]  Roh Y;Lee S Y;Elless M P,Characterization of corrosion products in the permeable reactive barriers,Environmental Geology,2000(1-2).
[6]  Pratt, AR ;Blowes, DW ;Ptacek, CJ,Products of chromate reduction on proposed subsurface remediation material,Environmental Science & Technology?,1997, 31(9).
[7]  Powell, RM ;Puls, RW,Proton generation by dissolution of intrinsic or augmented aluminosilicate minerals for in situ contaminant remediation by zero valence state iron,Environmental Science & Technology?,1997, 31(8).
[8]  BRUCE A. MANNING ;JON R. KISER ;HANCHEOL KWON ;SUSHIL RAJ KANEL,Spectroscopic Investigation of Cr(Ⅲ)- and Cr(Ⅵ)-Treated Nanoscale Zerovalent Iron,Environmental Science & Technology?,2007, 41(2).
[9]  Li X Q;Cao J;Zhang W X,Stoichiometry of Cr (Ⅵ) immobilization using nanoscale zerovalent iron(nZVI):A study with high-resolution X-ray photoelectron spectroscopy (HR-XPS),Industrial and Engineering Chemistry Research,2008.
[10]  Kaplan D I;Gilmore T J,Zero-valent iron removal rates of aqueous Cr(Ⅵ) measured under flow conditions,Water,Air & Soil Pollution? ,2004, 155(1-4).
[11]  Kanel, SR ;Greneche, JM ;Choi, H,Arsenic(V) removal kom groundwater using nano scale zero-valent iron as a colloidal reactive barrier material,Environmental Science & Technology?,2006, 40(6).
[12]  FENG HE ;DONGYE ZHAO,Preparation and Characterization of a New Class of Starch-Stabilized Bimetallic Nanoparticles for Degradation of Chlorinated Hydrocarbons in Water,Environmental Science & Technology?,2005, 39(9).
[13]  He F;Zhao D;Liu J,Stabilization of Fe-Pd nanoparticles with sodium carboxymethyl cellulose for enhanced transport and dechlorination of trichloroethylene in soil and groundwater,Industrial and Engineering Chemistry Research,2007.
[14]  耿兵;李铁龙;金朝晖,壳聚糖稳定纳米铁的制备及去除水体中Cr(Ⅵ)性能研究,高等学校化学学报,2009(4).
[15]  Lo I M;Lam C S;Lai K C,Hardness and carbonate effects on the reactivity of zero-valent iron for Cr(Ⅵ) removal,Water Research,2006.
[16]  Lo I M C;Lam S C;Lai C K,Competitive effects of TCE on Cr(Ⅵ) removal by zero-valent iron,Journal of Environmental Engineering ASCE,2005(11).

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