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| Fe3+纳米胶体颗粒的光吸收边蓝移与溶液中Al/Fe比的关系 | |
| 引用本文： | 章兴华,孙传敏,周丽芸,陆洋,刘世荣.Fe3+纳米胶体颗粒的光吸收边蓝移与溶液中Al/Fe比的关系[J].矿物学报,2005,25(2):158-164. |
| 作者姓名： | 章兴华 孙传敏 周丽芸 陆洋 刘世荣 |
| 作者单位： | 1. 成都理工大学,地球科学学院,四川,成都610059 2. 贵州省环保局,贵州,贵阳550002 3. 贵州省理化测试分析研究中心,贵州,贵阳550002 4. 中国科学院贵阳地化所,贵州,贵阳,550002 |
| 基金项目： | 四川省重点学科资助项目（SZD0407）. |
| 摘 要： | 合成了n（Al）／n（Fe）和碱化度不同的45个聚合氯化铝铁（PAFC）样品，进行了光谱分析，结果显示光吸收边蓝移或红移以及Fe（Ⅲ）羟基氧化物和Al-Fe共聚体纳米胶体颗粒大小分布与溶液的Al／Fe比和碱化度（B=OH]／Al＋Fe]）密切相关。电镜观察和电子衍射分析表明：Al（Ⅲ）的加入使Fe（Ⅲ）羟基氧化物和Al-Fe共聚体纳米胶体颗粒变小、有序度降低是造成PAFE光吸收边蓝移和保持胶体颗粒在亚稳定状态下存在的重要原因。当n（Al）／n（Fe）〉8：2后，PAFC溶液中Fe（Ⅲ）羟基氧化物和Al-Fe共聚体胶体主要以〈10m的纳米颗粒形态存在，对应的光谱能级提高到26000cm^-1以上，且各种曰值下Fe^3＋的光谱能级趋于一致。这表明，在大量Al（Ⅲ）存在条件下，PAFE中Fe3^＋的所处的化学环境相似。点能谱分析显示，n（Al）／n（Fe）=4：6的样品中颗粒物的化学计量比最接近AlOOH，FeOOH，溶液的稳定性最差。 |
| 关 键 词： | 聚合氯化铝铁 纳米级胶体颗粒 光吸收边蓝移 量子尺寸效应 表面效应 畸变八面体 |
| 文章编号： | 1000-4734（2005）02-0158-07 |
| 收稿时间： | 2004-09-13 |
| 修稿时间： | 2004年9月13日 |
RELATIONSHIP OF BLUE SHIFT OF Fe3+NANO-COLLOIDAL PAPRTICLES' ABSORPTION SPECTRA WITH Al/Fe MOLAR RATIO IN POLYALUMINUM FERRIC CHLORIDE SOLUTIONS |
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| ZHANG Xin-hua,SUN Chuan-min,ZHOU Li-yun,Lu Yang,LIU Shi-rong.RELATIONSHIP OF BLUE SHIFT OF Fe3+NANO-COLLOIDAL PAPRTICLES'' ABSORPTION SPECTRA WITH Al/Fe MOLAR RATIO IN POLYALUMINUM FERRIC CHLORIDE SOLUTIONS[J].Acta Mineralogica Sinica,2005,25(2):158-164. | |
| Authors: | ZHANG Xin-hua SUN Chuan-min ZHOU Li-yun Lu Yang LIU Shi-rong |
| Abstract: | Blue and red shifts of the absorption edges of 45 samples of polyaluminum ferric chloride(PAFC) are closely related with nano-colloidal particle size alteration of Fe()hydroxyl polymer and Al-Fe co-aggregate and with Al/Fe molar ratio and basicities (B=OH]/Al+Fe]) in PAFC solutions. Observations under a high resolution transmitted electron microscope and electron diffraction analysis of crystal structure showed that the addition of Al() in PAFC is a dominant factor causing colloidal particle size to decrease and long-range disorder of ferric oxide hydroxyl polymer and Al-Fe co-aggregate and this is an important cause for the blue shift of absorption edges and the particles being kept in sub-stability state. In the case of Al/Fe molar ratio>82,the principal colloidal particles of Fe()oxide hydroxyl polymer and Al-Fe co-aggregate in PAFC solutions are <10 nm ,the energy scales of electron transition of Fe~(3+)in PAFC solutions are over 26000 cm~(-1) and tend to be unanimous at variable B ,which displays that the chemical surroundings of Fe~(3+) are the same as in PAFC solutions with the presence of larger quantities of Al()oxide hydroxyl polymer.Compositional analysis of nm-level area and microanalysis of element distribution using EDS showed that the stoichiometry of particles in Al/Fe molar ratio 46 PAFC solution is nearest those of AlOOH and FeOOH, so the stability of the solution is poor. |
| Keywords: | polyaluminum ferric chloride solution nano-colloidal particle blue shift of absorption edge quantum size effect surface effect distorted oetahedron |
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