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smcg

铜虫 (小有名气)

[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

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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juanjingmiao

银虫 (正式写手)


smcg(金币+1):谢谢参与
yunruirui:谢谢参与 2010-10-30 12:33:54
在水溶液中反应
2楼2010-10-30 10:15:07
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wangh123

木虫 (正式写手)


smcg(金币+1):谢谢参与
yunruirui:谢谢参与交流 2010-10-30 12:34:03
你的反应体系什么样的?
3楼2010-10-30 10:48:17
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lleecc1

金虫 (小有名气)


smcg(金币+1):谢谢参与
yunruirui:谢谢参与交流 2010-10-30 12:34:09
浙江 大学的 徐新华做过 纳米四氧化三铁的 负载,你去看看他的 英文论文,有一篇的,我记得。
4楼2010-10-30 10:56:11
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lleecc1

金虫 (小有名气)

yunruirui:谢谢交流 2010-10-30 12:34:18
smcg(金币+2): 2010-10-30 15:22:26
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
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lleecc1

金虫 (小有名气)

yunruirui:谢谢参与 2010-10-30 12:34:35
壳聚糖 负载纳米铁,南开大学 金朝晖 做过的。
6楼2010-10-30 11:02:23
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mrzouhao

木虫之王 (文坛精英)

★ ★ ★
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
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
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smcg(金币+1):谢谢参与
8楼2010-10-30 11:31:33
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smcg

铜虫 (小有名气)

引用回帖:
Originally posted by wangh123 at 2010-10-30 10:48:17:
你的反应体系什么样的?

共沉淀法做
9楼2010-10-30 15:20:21
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smcg

铜虫 (小有名气)

引用回帖:
Originally posted by lleecc1 at 2010-10-30 10:56:11:
浙江 大学的 徐新华做过 纳米四氧化三铁的 负载,你去看看他的 英文论文,有一篇的,我记得。

谢谢了
10楼2010-10-30 15:21:27
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