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smcg铜虫 (小有名气)
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[交流]
【求助】Fe3O4颗粒表面包覆壳聚糖 Fe3O4溶液的要求？已有1人参与
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在Fe3O4颗粒表面包覆壳聚糖，Fe3O4颗粒必须溶于水溶液中，还是只用悬浮液就行了？ 谢谢 |
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mrzouhao
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smcg(金币+1):谢谢参与
yunruirui(金币+2):谢谢参与 2010-10-30 12:34:27
smcg(金币+2): 2010-10-30 15:22:41
smcg(金币+1):谢谢参与
yunruirui(金币+2):谢谢参与 2010-10-30 12:34:27
smcg(金币+2): 2010-10-30 15:22:41
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J Hazard Mater. 2009 Dec 30;172(2-3):1640-5. Epub 2009 Aug 18. Chromium (VI) reduction in aqueous solutions by Fe3O4-stabilized Fe0 nanoparticles. Wu Y, Zhang J, Tong Y, Xu X. Department of Environmental Engineering, Zhejiang University, Zheda Road 38#, Hangzhou 310027, People's Republic of China. Abstract This paper describes the use of highly reactive magnetite (Fe(3)O(4)) nanoparticles-stabilized Fe(0) nanocomposites for the reduction and mitigation of hexavalent chromium Cr(VI) species in aqueous solutions. Higher proportions of Fe(3)O(4) in the nanocomposites could increase the rate of Cr(VI) reduction. In the absence of magnetite, the Cr(VI) mitigation rate was just 51.4% after 60 min of reaction, while with an initial Fe(3)O(4) mass loading of 3 g l(-1), the Cr(VI) mitigation rate was nearly 100% after 60 min. The optimal ratio of Fe(3)O(4):Fe(0) for the mitigation of Cr(VI) was found to be 40:1. Otherwise, solution pHs significantly affected the rate of Cr(VI) reduction, with reactions occurring more rapidly under acidic or neutral than basic conditions. It is hypothesized that the high efficiency of the Fe(3)O(4) nanoparticles-stabilized Fe(0) nanocomposites for Cr(VI) reduction was a direct result of the attachment of Fe(0) nanoparticles to the surface of magnetite, which prevents the aggregation of nano-Fe(0), moreover, the electron transfer during the reduction process most likely takes place via Fe(0) nanoparticles that are located at the magnetite octahedral sites, which are versatile redox centers as they can accommodate both Fe(III) and Fe(II), and this will promote the reduction of Cr(VI). Cr(VI) reduction is coupled with nano-Fe(0) oxidation. Nano-Fe(0) particles are located at the magnetite octahedral sites. Ions of Fe(II) and Fe(III) accommodated by magnetite octahedral sites are products of nano-Fe(0) oxidation. Therefore, Cr(VI) reduction is mediated either by nano-Fe(0) (direct reduction) or Fe(II) species (indirect reduction). Additionally, catalytic Cr(VI) reduction by molecular H(2) (or atomic H) is possible. |
7楼2010-10-30 11:27:23
wangh123
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3楼2010-10-30 10:48:17
4楼2010-10-30 10:56:11
yunruirui:谢谢交流 2010-10-30 12:34:18
smcg(金币+2): 2010-10-30 15:22:26
smcg(金币+2): 2010-10-30 15:22:26
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Chromium (VI) reduction in aqueous solutions by Fe3O4-stabilized Fe0 nanoparticles Original Research Article Journal of Hazardous Materials, Volume 172, Issues 2-3, 30 December 2009, Pages 1640-1645 Yanjun Wu, Jinghui Zhang, Yifei Tong, Xinhua Xu 是这篇 |
5楼2010-10-30 11:01:27