Please wait a minute...
ZJUS-A
Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2014, Vol. 15 Issue (8): 634-642    DOI: 10.1631/jzus.A1400115
Articles     
The role of humic acid in stabilizing fullerene (C60) suspensions
Lu-qing Zhang, Yu-kun Zhang, Xiu-chun Lin, Kun Yang, Dao-hui Lin
Department of Environmental Science, Zhejiang University, Hangzhou 310058, China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Hangzhou 310058, China; College of Environmental and Biological Engineering, Putian University, Putian 351100, China
Download:     PDF (0 KB)     
Export: BibTeX | EndNote (RIS)      

Abstract  Natural organic matter (NOM) has a profound effect on the colloidal stability of discharged C60 nanoparticles in the water environment, which influences the environmental behaviors and risks of C60 and therefore merits more specific studies. This study investigates the effects of humic acid (HA), as a model NOM, on the aqueous stabilization of C60 powder and the colloidal stability of a previously suspended C60 suspension (aqu/nC60) with variations of pH values and ionic strengths. Our results reveal that HA could disperse C60 powder in water to some degree, but was unable to stably suspend them. The aqu/nC60 could remain stable at pH>4 but was destabilized at lower pH values. However, the colloidal stability of aqu/nC60 in the presence of HA was insensitive to pH 3–11, owing to the adsorption of HA onto nC60 and the increased electrosteric repulsions among nC60 aggregates. The colloidal stability of aqu/nC60, with and without HA, decreased as we increased the valence and concentration of the added cations. HA was found to mitigate the destabilization effect of Na+ on the colloidal stability of aqu/nC60 by increasing the critical coagulation concentration (CCC) of Na+, while HA lowered the CCCs of Ca2+ and La3+ probably by the bridging effect of nC60 with HA aggregates formed through the intermolecular bridging of the HA macromolecules via cation complexation at high concentrations of cations with high valences.

Key words： Fullerene      Humic acid      Colloidal stability      Natural organic matter      Nanomaterial     
Received: 30 April 2014      Published: 04 August 2014
CLC:  X52  
Service
E-mail this article
Add to my bookshelf
Add to citation manager
E-mail Alert
RSS
Articles by authors
Lu-qing Zhang
Kun Yang
Yu-kun Zhang
Xiu-chun Lin
Dao-hui Lin
Cite this article:

Lu-qing Zhang, Yu-kun Zhang, Xiu-chun Lin, Kun Yang, Dao-hui Lin. The role of humic acid in stabilizing fullerene (C60) suspensions. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2014, 15(8): 634-642.

URL:

http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A1400115     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2014/V15/I8/634

[1] Jian Wang, Wen-xiong Wang. Significance of physicochemical and uptake kinetics in controlling the toxicity of metallic nanomaterials to aquatic organisms[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2014, 15(8): 573-592.
[2] Fan-bao Hu, Yong-feng Lin, Ru Chen, Lei Ding, Wei Jiang. Effects of humic acid and bovine serum albumin on the agglomeration and sedimentation of oxide nanoparticles[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2014, 15(8): 643-652.
[3] Kun Yang, Dao-hui Lin. Environmental risks of engineered nanomaterials[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2014, 15(8): 547-551.
[4] Ying-qing Deng, Jason C. White, Bao-shan Xing. Interactions between engineered nanomaterials and agricultural crops: implications for food safety[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2014, 15(8): 552-572.
[5] Yong-ji Zhang, Ling-ling Zhou, Guo Zeng, Zheng-guo Song, Gui-bai Li. Factors affecting the formation of trihalomethanes in the presence of bromide during chloramination[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2010, 11(8): 606-612.
[6] Jing-jing WO, Zhen ZHANG, Xin-hua XU. Dechlorination mechanism of 2,4-dichlorophenol by Ni/Fe nanoparticles in the presence of humic acid[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(1): 121-126.
[7] Zhen ZHANG, Jing-jing WO, Naman CISSOKO, Xin-hua XU. Kinetics of 2,4-dichlorophenol dechlorination by Pd-Fe bimetallic nanoparticles in the presence of humic acid[J]. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2008, 9(1): 118-124.