RCEES OpenIR  > 环境水质学国家重点实验室
Effect of polyferric chloride (PFC) doses and pH on the fractal characteristics of PFC-HA flocs
Wang, Y. L.; Feng, J.; Dentel, S. K.; Lu, J.; Shi, B. Y.; Wang, D. S.
2011
Conference Name6th International Conference on Interfaces Against Pollution (IAP 2010)
Conference DateMAY 16-19, 2010
Conference PlaceBeijing, PEOPLES R CHINA
ISBN0927-7757
Department环境水质学国家重点实验室
AbstractChanges in the fractal characteristics of PFC-HA flocs with polyferric chloride (PFC) doses and coagulation pHs were investigated in this study. A type of PFC coagulant with a hydrolysis degree (B*) of 0.6027 and a Fe(III) concentration of 0.202 mol/L was employed to coagulate HA solutions at five constant coagulation pHs. Zeta potential tests were employed to reveal the coagulation mechanisms. The physical properties of flocs formed in the coagulation process were analyzed by their CCD image morphology, size distribution, and fractal dimensions. Next, microscopic observations and nitrogen-adsorption-desorption methods were conducted to characterize the pore structure and surface fractal dimensions of powders prepared from these flocs through a cryofixation-vacuum-freeze-drying procedure. The PFC doses and coagulation pHs had an obvious effect on the physical characteristics of PFC-HA flocs and their corresponding powders. Generally, in the low PFC dose range, PFC-HA flocs formed under acidic coagulation pHs and charge neutralization mechanisms were larger, had less irregular boundaries or surfaces (lower D(1) value), a more compact structure (lower D(2) value) and more irregular pore surface or pore size distribution in their dried powder than those formed under neutral and alkaline coagulation pHs and physical enmeshment and/or fresh precipitate adsorption mechanisms involved in the coagulation process. After the PFC doses exceeded this range, a gradual reversal phenomenon occurred. Furthermore, there were different specific PFC dosages that were above the critical reversal point for each property of these flocs or powders, such as the median diameter, one-dimensional fractal dimension, two-dimensional fractal dimension, and pore surface fractal dimension. In addition to these characteristics, the most compact PFC-HA flocs were formed at coagulation pH = 6.00 +/- 0.05 and a PFC dosage of 4.04 x 10(-4) mol/L (Fe(3+)), and the loosest flocs were produced at coagulation pH = 7.00 +/- 0.05 and a PFC dose of 1.01 x 10(-4) mol/L (Fe(3+)). (C) 2010 Elsevier B.V. All rights reserved.
KeywordPfc Ha Flocs Fractal Dimensions Dosage Coagulation Phs Coagulation Mechanisms
DOI10.1016/j.colsurfa.2010.11.044
WOS IDWOS:000289920200010
Citation statistics
Document Type会议论文
Identifierhttp://ir.rcees.ac.cn/handle/311016/24626
Collection环境水质学国家重点实验室
Recommended Citation
GB/T 7714
Wang, Y. L.,Feng, J.,Dentel, S. K.,et al. Effect of polyferric chloride (PFC) doses and pH on the fractal characteristics of PFC-HA flocs[C],2011.
Files in This Item: Download All
File Name/Size DocType Version Access License
Effect of polyferric(857KB)会议论文 开放获取CC BY-NC-SAView Download
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Wang, Y. L.]'s Articles
[Feng, J.]'s Articles
[Dentel, S. K.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Wang, Y. L.]'s Articles
[Feng, J.]'s Articles
[Dentel, S. K.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Wang, Y. L.]'s Articles
[Feng, J.]'s Articles
[Dentel, S. K.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Effect of polyferric chloride (PFC) doses and pH on the fractal characteristics of PFC–HA flocs.pdf
Format: Adobe PDF
This file does not support browsing at this time
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.