| 查看: 2762 | 回复: 12 | |||||
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 |
回复此楼» 收录本帖的淘帖专辑推荐
 四氧化三铁纳米颗粒制备、修饰及包覆 | 吸附材料 |
» 猜你喜欢
金属材料论文润色/翻译怎么收费?
已经有59人回复
» 本主题相关价值贴推荐，对您同样有帮助:
- 8金币问怎样在Fe3O4磁性纳米粒子表面包覆一层环糊精
已经有12人回复
- 油胺包覆的Fe3O4却不能在正己烷中很好地分散，求解答？
已经有23人回复
- 大家有看过将TiO2直接包覆在Fe3O4的文献吗？
已经有16人回复
- Fe3O4表面包覆TiO2包覆不上的问题
已经有22人回复
- Fe3O4纳米颗粒聚合物凝胶相分散
已经有15人回复
- 关于做油酸包覆的Fe3O4的问题
已经有16人回复
- 两种方法 细乳液聚合制备PS包覆Fe3O4粒子的问题，附有电镜图
已经有15人回复
- 【请教】聚合物微球表面接枝Fe3O4纳米颗粒
已经有14人回复
- 【求助】如何将油相稳定的Fe3O4微球变成水相稳定的颗粒，以便于进行下一上的负载
已经有9人回复
- 【求助】Fe3O4/CS(磁性壳聚糖微球)的合成及固定化酶的若干问题
已经有12人回复
- 【求助】纳米Fe3O4溶液的外观
已经有30人回复
- 【求助】要用硅烷偶联剂改性Fe3O4，是否一定要先把Fe3O4干燥成颗粒
已经有17人回复
juanjingmiao
银虫 (正式写手)
- 应助: 0 (幼儿园)
- 金币: 1842.4
- 散金: 92
- 红花: 2
- 帖子: 423
- 在线: 97.9小时
- 虫号: 944639
- 注册: 2010-01-18
- 专业: 无机纳米化学
2楼2010-10-30 10:15:07
wangh123
木虫 (正式写手)
- 应助: 1 (幼儿园)
- 金币: 5375.7
- 散金: 1091
- 红花: 3
- 帖子: 348
- 在线: 746.6小时
- 虫号: 1060262
- 注册: 2010-07-19
- 性别: GG
- 专业: 无机材料化学
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
|
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
6楼2010-10-30 11:02:23
mrzouhao
木虫之王 (文坛精英)
- 应助: 179 (高中生)
- 贵宾: 0.108
- 金币: 102557
- 散金: 11621
- 红花: 134
- 沙发: 23
- 帖子: 47407
- 在线: 4440.2小时
- 虫号: 201350
- 注册: 2006-02-28
- 专业: 药剂学
★ ★ ★
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
|
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
★
smcg(金币+1):谢谢参与
smcg(金币+1):谢谢参与
 |
8楼2010-10-30 11:31:33
smcg
铜虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 142.7
- 散金: 247
- 帖子: 277
- 在线: 66小时
- 虫号: 634520
- 注册: 2008-10-23
- 性别: GG
- 专业: 高分子组装与超分子结构
9楼2010-10-30 15:20:21
smcg
铜虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 142.7
- 散金: 247
- 帖子: 277
- 在线: 66小时
- 虫号: 634520
- 注册: 2008-10-23
- 性别: GG
- 专业: 高分子组装与超分子结构
10楼2010-10-30 15:21:27
投票:
30