| Effects of Ca on the distribution, structure and morphology of aluminum species in polyaluminum chloride |
| |
| 作者姓名： | ZHAOHuazhang GExiaopeng LUANZhaokun JIANGZhanpeng |
| |
| 作者单位： | [1]DepartmentofEnvironmentalScienceandEngineering,TsinghuaUniversity,Beijing100084,China [2]StateKeyLabOratoryofEnvironmentalAquaticChemistry,ResearchCenterforEco-EnvironmentalSciences,ChineseAcademyofSciences,Beijing100085,China |
| |
| 摘 要： | The flocculation efficiency of polyaluminum chloride (PAC) is closely related to the distribution and structure of its AI species, and Al13 is the optimal species in PAC for flocculation. A series of PAC containing Ca was prepared by adding Ca before and after the basifying reaction. The effects of Ca on the Al species were studied by ^27Al nuclear magnetic resonance (NMR) and atomic force microscope (AFM) techniques. The experimental results show that the introduction of Ca increases the content of Alm and Al13 in PAC and decreases their chemical shifts in NMR spectra due to the electric repulsion between the positive Ca species and AI species and the formation of AI-O-Ca complexes.With the rise of Ca/AI molar ratio, the AI species in PAC tend to scatter. It is observed that the formerly branch-aggregated clusters are tending to form granule-aggregated ones whose diameter gets smaller and smaller, and the floccule aggregates are formed at a higher Ca/Al molar ratio. The introduction of Ca to PAC, which increases the Al13 content, is certainly to enhance the flocculation efficiency of PAC in water treatment.
|
| 关 键 词： | 聚合氯化铝 AL13 形态学 钙 水处理 絮凝剂 PAC |
| 收稿时间： | 2004-02-17 |
| 修稿时间： | 2004-03-26 |
Effects of Ca on the distribution, structure and morphology of aluminum species in polyaluminum chloride |
| |
| ZHAOHuazhang GExiaopeng LUANZhaokun JIANGZhanpeng.Effects of Ca on the distribution, structure and morphology of aluminum species in polyaluminum chloride[J].Chinese Science Bulletin,2004,49(12):1241-1244. |
| |
| Authors: | Zhao Huazhang Ge Xiaopeng Luan Zhaokun Jiang Zhanpeng |
| |
| Institution: | ZHAO Huazhang1, GE Xiaopeng2, LUAN Zhaokun2 & JIANG Zhanpeng1 1. Department of Environmental Science and Engineering, Tsinghua Un- iversity, Beijing 100084, China; 2. State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sci- ences, Beijing 100085, China |
| |
| Abstract: | The flocculation efficiency of polyaluminum chloride (PAC) is closely related to the distribution and structure of its Al species, and Al13 is the optimal species in PAC for flocculation. A series of PAC containing Ca was prepared by adding Ca before and after the basifying reac- tion. The effects of Ca on the Al species were studied by Al 27 nuclear magnetic resonance (NMR) and atomic force micro- scope (AFM) techniques. The experimental results show that the introduction of Ca increases the content of Alm and Al13 in PAC and decreases their chemical shifts in NMR spectra due to the electric repulsion between the positive Ca species and Al species and the formation of Al-O-Ca complexes. With the rise of Ca/Al molar ratio, the Al species in PAC tend to scatter. It is observed that the formerly branch-aggregated clusters are tending to form granule-aggregated ones whose diameter gets smaller and smaller, and the floccule aggre- gates are formed at a higher Ca/Al molar ratio. The intro- duction of Ca to PAC, which increases the Al13 content, is certainly to enhance the flocculation efficiency of PAC in water treatment. |
| |
| Keywords: | Al13 species distribution of Al species structure and morphology polyaluminum chloride containing Ca |
| 本文献已被 CNKI 维普 万方数据 SpringerLink 等数据库收录！ |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |
