Suspension stability and aggregation of multi-walled carbon nanotubes as affected by dissolved organic matters extracted from agricultural wastes
文献类型: 外文期刊
作者: Li, Helian;Qiu, Yanhua;Wang, Xiaonuan;Liu, Wenhao;Ma, Yibing;Li, Helian;Chen, Guangcai;Xing, Baoshan;Chen, Guangcai;Ma, Yibing
作者机构:
关键词: Carbon nanotubes;Dissolved organic matter;Agricultural waste;Suspension;Aggregation
期刊名称: ENVIRONMENTAL POLLUTION
ISSN:
年卷期:
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收录情况: SCI
摘要: Dissolved organic matters (DOMs) extracted from wheat straw (SDOM) and cow manure (MDOM) were used to investigate their effects on the suspension stability and aggregation of multi-walled carbon nanotubes (MWCNTs). Two types of DOM can effectively disperse and stabilize the MWCNTs. At initial MWCNT concentration of 500 mg/L, suspended MWCNT concentration ranged from 8.0 to 17.9 mg/L as DOM were varied from 50 to 200 mg/L dissolved organic carbon (DOC). The critical coagulation concentration (CCC) values were estimated to be 41.4 mM NaCl and 5.3 mM CaCl2 in the absence of DOM. The presence of SDOM and MDOM significantly retarded the aggregation rate of MWCNTs. The CCC values increased to 120 mM NaCl and 14.8 mM CaCl2 at SDOM concentration of 20 mg/L DOC. Due to its higher aromaticity and molecular weight, MDOM showed higher ability to stabilize MWCNTs, with CCC values of 201 mM and 15.8 mM at 20 mg/L DOC. These findings revealed that DOMs originated from agricultural wastes will have great impact on the dispersion and stabilization of MWCNTs, thus their fate in the aquatic environment. (C) 2016 Elsevier Ltd. All rights reserved.
分类号: X5
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