On the acid-base stability of Keggin Al-13 and Al-30 polymers in polyaluminum coagulants
文献类型：期刊论文
| 作者 | Chen, Zhaoyang1; Luan, Zhaokun2; Jia, Zhiping2; Li, Xiaosen1
|
| 刊名 | journal of materials science
 |
| 出版日期 | 2009-06-01 |
| 卷号 | 44期号:12页码:3098-3111 |
| ISSN号 | 0022-2461 |
| 关键词 | AL13 TRIDECAMERIC POLYCATION AQUEOUS-SOLUTION ALUMINUM TRANSFORMATION CHEMISTRY POLYOXOCATIONS COMPLEXES AL-13-CLUSTER HYDROLYSIS SPECIATION |
| 通讯作者 | chenzy@ms.giec.ac.cn ; lixs@ms.giec.ac.cn |
| 中文摘要 | the acid-base stabilities of al-13 and al-30 in polyaluminum coagulants during aging and after dosing into water were studied systematically using batch and flow-through acid-base titration experiments. the acid decomposition rates of both al-13 and al-30 increase rapidly with the decrease in solution ph. the acid decompositions of al-13 and al-30 with respect to h+ concentration are composed of two parallel first-order and second-order reactions, and the reaction orders are 1.169 and 1.005, respectively. the acid decomposition rates of al-13 and al-30 increase slightly when the temperature increases from 20 to ca. 35 a degrees c, but decrease when the temperature increases further. al-30 is more stable than al-13 in acidic solution, and the stability difference increases as the ph decreases. al-30 is more possible to become the dominant species in polyaluminum coagulants than al-13. the acid catalyzed decomposition and followed by recrystallization to form bayerite is one of the main processes that are responsible for the decrease of al-13 and al-30 in polyaluminum coagulants during storage. the deprotonation and polymerization of al-13 and al-30 depend on solution ph. the hydrolysis products are positively charged, and consist mainly of repeated al-13 and al-30 units rather than amorphous al(oh)(3) precipitates. al-30 is less stable than al-13 upon alkaline hydrolysis. al-13 is stable at ph < 5.9, while al-30 lose one proton at the ph 4.6-5.75. al-13 and al-30 lose respective 5 and 10 protons and form [al-13] (n) and [al-30] (n) clusters within the ph region of 5.9-6.25 and 5.75-6.65, respectively. this indicates that al-30 is easier to aggregate than al-13 at the acidic side, but [al-13] (n) is much easier to convert to alsol-gel than [al-30] (n) . al-30 possesses better characteristics than al-13 when used as coagulant because the hydrolysis products of al-30 possess higher charges than that of al-13, and [al-30] (n) clusters exist within a wider ph range. |
| 英文摘要 | the acid-base stabilities of al-13 and al-30 in polyaluminum coagulants during aging and after dosing into water were studied systematically using batch and flow-through acid-base titration experiments. the acid decomposition rates of both al-13 and al-30 increase rapidly with the decrease in solution ph. the acid decompositions of al-13 and al-30 with respect to h+ concentration are composed of two parallel first-order and second-order reactions, and the reaction orders are 1.169 and 1.005, respectively. the acid decomposition rates of al-13 and al-30 increase slightly when the temperature increases from 20 to ca. 35 a degrees c, but decrease when the temperature increases further. al-30 is more stable than al-13 in acidic solution, and the stability difference increases as the ph decreases. al-30 is more possible to become the dominant species in polyaluminum coagulants than al-13. the acid catalyzed decomposition and followed by recrystallization to form bayerite is one of the main processes that are responsible for the decrease of al-13 and al-30 in polyaluminum coagulants during storage. the deprotonation and polymerization of al-13 and al-30 depend on solution ph. the hydrolysis products are positively charged, and consist mainly of repeated al-13 and al-30 units rather than amorphous al(oh)(3) precipitates. al-30 is less stable than al-13 upon alkaline hydrolysis. al-13 is stable at ph < 5.9, while al-30 lose one proton at the ph 4.6-5.75. al-13 and al-30 lose respective 5 and 10 protons and form [al-13] (n) and [al-30] (n) clusters within the ph region of 5.9-6.25 and 5.75-6.65, respectively. this indicates that al-30 is easier to aggregate than al-13 at the acidic side, but [al-13] (n) is much easier to convert to alsol-gel than [al-30] (n) . al-30 possesses better characteristics than al-13 when used as coagulant because the hydrolysis products of al-30 possess higher charges than that of al-13, and [al-30] (n) clusters exist within a wider ph range. |
| WOS标题词 | science & technology ; technology |
| 类目[WOS] | materials science, multidisciplinary |
| 研究领域[WOS] | materials science |
| 关键词[WOS] | al13 tridecameric polycation ; aqueous-solution ; aluminum ; transformation ; chemistry ; polyoxocations ; complexes ; al-13-cluster ; hydrolysis ; speciation |
| 资助信息 | national high technology research and development key program of china [2002aa601290]; national natural science foundation of china [50874098, 40673003] |
| 收录类别 | SCI |
| 原文出处 | http://www.springerlink.com/content/0022-2461/ |
| 语种 | 英语 |
| WOS记录号 | WOS:000266039000013 |
| 公开日期 | 2010-09-16 |
| 源URL | [http://ir.giec.ac.cn/handle/344007/3344]  |
| 专题 | 中国科学院广州能源研究所 |
| 作者单位 | 1.Chinese Acad Sci, Key Lab Renewable Energy & Gas Hydrate, Guangzhou Inst Energy Convers, Guangzhou 510640, Peoples R China 2.Chinese Acad Sci, State Key Lab Environm Aquat Chem, Res Ctr Ecoenvironm Sci, Beijing 100085, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Zhaoyang,Luan, Zhaokun,Jia, Zhiping,et al. On the acid-base stability of Keggin Al-13 and Al-30 polymers in polyaluminum coagulants[J]. journal of materials science,2009,44(12):3098-3111. |
| APA | Chen, Zhaoyang,Luan, Zhaokun,Jia, Zhiping,&Li, Xiaosen.(2009).On the acid-base stability of Keggin Al-13 and Al-30 polymers in polyaluminum coagulants.journal of materials science,44(12),3098-3111. |
| MLA | Chen, Zhaoyang,et al."On the acid-base stability of Keggin Al-13 and Al-30 polymers in polyaluminum coagulants".journal of materials science 44.12(2009):3098-3111. |
入库方式： OAI收割
来源：广州能源研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。