The Influence of Small Organic Molecules on Coagulation from the Perspective of Hydrolysis Competition and Crystallization
文献类型：期刊论文
| 作者 | Zhang, Xuejia; Graham, Nigel; Xu, Lei; Yu, Wenzheng ; Gregory, John
|
| 刊名 | ENVIRONMENTAL SCIENCE & TECHNOLOGY
 |
| 出版日期 | 2021-06-01 |
| 卷号 | 55期号:11页码:7456-7465 |
| 关键词 | flocculation alum coagulation |
| ISSN号 | 0013-936X |
| 英文摘要 | Most coagulation studies focus on pollutant removal or floc separation efficiency. However, to understand the mechanism of coagulation, it is necessary to explore the behavior of coagulation in terms of the interactions among the functional groups on the surface of the metal hydrolysis precipitates during the hydrolysis process. In this study, for the first time, aluminum sulfate (alum) was used to investigate such interactions over the whole process sequence of hydrolysis, coagulation, and crystallization with, and without (as a control), the presence of specific low molecular weight (LMW) (molecular weight < 1000 Da) organic compounds with different chemical bonds. It was observed that primary nanoparticles (NPs) of around 10 nm size were produced during the hydrolysis of alum. The presence of organic compounds was found to influence the coagulation performance by affecting the metal hydrolysis and the properties of the nanoparticles. At pH 7, ethylenediaminetetraacetic acid disodium salt (EDTA) delayed the time when the particles start to aggregate but increased the maximum size of the flocs, while citric acid caused the crystallization of amorphous hydrates and inhibited the coagulation performance. In contrast, glucose, benzoic acid (BEN), and tris(hydroxymethyl)aminomethane (THMAM) had no significant effect on the coagulation performance. Therefore, LMW organics can bond to the hydrolysis products of metal ions through key functional groups, such as carboxyl groups, and then affect the coagulation process. The experimental results show that the presence of LMW organics can change the surface properties and degree of crystallization of the primary NPs, thereby affecting the performance of coagulation. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/46007]  |
| 专题 | 生态环境研究中心_环境水质学国家重点实验室 |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Aquat Chem, Beijing 100085, Peoples R China 3.Imperial Coll London, Dept Civil & Environm Engn, London SW7 2AZ, England 4.UCL, Dept Civil Environm & Geomat Engn, London WC1E 6BT, England |
| 推荐引用方式 GB/T 7714 | Zhang, Xuejia,Graham, Nigel,Xu, Lei,et al. The Influence of Small Organic Molecules on Coagulation from the Perspective of Hydrolysis Competition and Crystallization[J]. ENVIRONMENTAL SCIENCE & TECHNOLOGY,2021,55(11):7456-7465. |
| APA | Zhang, Xuejia,Graham, Nigel,Xu, Lei,Yu, Wenzheng,&Gregory, John.(2021).The Influence of Small Organic Molecules on Coagulation from the Perspective of Hydrolysis Competition and Crystallization.ENVIRONMENTAL SCIENCE & TECHNOLOGY,55(11),7456-7465. |
| MLA | Zhang, Xuejia,et al."The Influence of Small Organic Molecules on Coagulation from the Perspective of Hydrolysis Competition and Crystallization".ENVIRONMENTAL SCIENCE & TECHNOLOGY 55.11(2021):7456-7465. |
入库方式： OAI收割
来源：生态环境研究中心
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。