Static and dynamic removal of aquatic natural organic matter by carbon nanotubes

被引：37

作者：

Ajmani, Gaurav S. ^{[1
]}

Cho, Hyun-Hee ^{[2
]}

Chalew, Talia E. Abbott ^{[1
]}

Schwab, Kellogg J. ^{[1
]}

Jacangelo, Joseph G. ^{[1
,3
]}

Huang, Haiou ^{[1
,4
]}

机构：

[1] Johns Hopkins Univ, Ctr Water & Hlth, Baltimore, MD 21205 USA

[2] KOLON Water & Energy Co LTD, SD Ctr, Seoul 137870, South Korea

[3] MWH, Lovettsville, VA 20180 USA

[4] Beijing Normal Univ, Sch Environm, State Joint Key Lab Environm Simulat & Pollut Con, Beijing 100875, Peoples R China

来源：

WATER RESEARCH | 2014年 / 59卷

关键词：

Carbon nanotube; Static adsorption; Membrane filtration; Natural organic matter; Drinking water; LOW-PRESSURE MEMBRANES; ADSORPTION;

D O I：

10.1016/j.watres.2014.04.030

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Carbon nanotubes (CNTs) were investigated for their capability and mechanisms to simultaneously remove colloidal natural organic matter (NOM) and humic substances from natural surface water. Static removal testing was conducted via adsorption experiments while dynamic removal was evaluated by layering CNTs onto substrate membranes and filtering natural water through the CNT-layered membranes. Analyses of treated water samples showed that removal of humic substances occurred via adsorption under both static and dynamic conditions. Removal of colloidal NOM occurred at a moderate level of 36-66% in static conditions, independent of the specific surface area (SSA) of CNTs. Dynamic removal of colloidal NOM increased from approximately 15% with the unmodified membrane to 80-100% with the CNT-modified membranes. Depth filtration played an important role in colloidal NOM removal. A comparison of the static and dynamic removal of humic substances showed that equilibrium static removal was higher than dynamic (p < 0.01), but there was also a significant linear relationship between static and dynamic removal (p < 0.05). Accounting for contact time of CNTs with NOM during filtration, it appeared that CNT mat structure was an important determinant of removal efficiencies for colloidal NOM and humic substances during CNT membrane filtration. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：262 / 270

页数：9

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