Effect of thermal treatment on the formation and transformation of Keggin Al-13 and Al-30 species in hydrolytic polymeric aluminum solutions
文献类型：期刊论文
| 作者 | Chen, Zhaoyang; Luan, Zhaokun; Fan, Jinghua; Zhang, Zhongguo; Peng, Xianjia; Fan, Bin |
| 刊名 | COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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| 出版日期 | 2007-01-15 |
| 卷号 | 292期号:1页码:110-118 |
| 关键词 | aluminum hydrolysis Al-27 NMR Al-ferron colorimetry nanosized Al-13 and Al-30 species distribution polycation |
| 英文摘要 | The effect of thermal treatment on the formation and transformation of Al-13 and Al-30 species in highly concentrated hydrolytic polymeric At solutions (HPA) (0.2-1.0 mol L-1) were studied quantitatively using high-field Al-27 nuclear magnetic resonance (NMR) and time-developed Al-Ferron complex colorimetry. The results indicate that the metastable Al-13 species in HPA tends to polymerize and transform into Al-30 and other high polymers upon thermal treatment. The polymerization and transformation are speed up by heating at high temperature. Al-13 content in HPA decreases upon thermal treatment, and Al-30 content increases. Al-13 does not convert to Al-30 quantitatively due to its aggregation and acidic dissociation reactions. Al-13 species is a dominant nanosized Al species in freshly prepared HPA solutions, and its content reaches above 80.0% in HPA with Al-T = 0.2 mol L-1 and optimal hydrolysis ratios (B) (ca. 2.3-2.4). But the content of Al-30 becomes higher than that of Al-13 when the HPA solution is heated at 95 degrees C for more than 12 h. Al-30 becomes the dominant nanosized At species in HPA, and its content reaches 76.8% in sample with Al-T = 0.2 mol L-1 and B = 2.4. Although Al-30 is more stable than Al-13, it is also a metastable species during the process of At hydrolysis, polymerization and precipitation. The decomposition and polymerization of Al-30 are also speed up by increase the heating temperature. The optimal preparation temperature of Al-30 is ca. 95 degrees C. At species in HPA solutions transform into more stable and inert species through inter-species polymerization and intra-species structure rearrangement upon thermal treatment. So Al-b Contents decrease, and Al. contents increase. Al-30 cannot react with Ferron within 120 min, and it is classified as Al-c species in Al-Ferron analysis. The effect of thermal treatment on Al speciation in HPA solutions with different total At concentration and B value were also investigated. (c) 2006 Elsevier B.V. All rights reserved. |
| WOS记录号 | WOS:000243630900003 |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/22554]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Chen, Zhaoyang,Luan, Zhaokun,Fan, Jinghua,et al. Effect of thermal treatment on the formation and transformation of Keggin Al-13 and Al-30 species in hydrolytic polymeric aluminum solutions[J]. COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,2007,292(1):110-118. |
| APA | Chen, Zhaoyang,Luan, Zhaokun,Fan, Jinghua,Zhang, Zhongguo,Peng, Xianjia,&Fan, Bin.(2007).Effect of thermal treatment on the formation and transformation of Keggin Al-13 and Al-30 species in hydrolytic polymeric aluminum solutions.COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS,292(1),110-118. |
| MLA | Chen, Zhaoyang,et al."Effect of thermal treatment on the formation and transformation of Keggin Al-13 and Al-30 species in hydrolytic polymeric aluminum solutions".COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS 292.1(2007):110-118. |
入库方式： OAI收割
来源：生态环境研究中心
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