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Frontiers of Environmental Science & Engineering

ISSN 2095-2201

ISSN 2095-221X(Online)

CN 10-1013/X

Postal Subscription Code 80-973

2018 Impact Factor: 3.883

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Front. Environ. Sci. Eng.    2015, Vol. 9 Issue (2) : 197-205    https://doi.org/10.1007/s11783-014-0624-6
RESEARCH ARTICLE
Behavior of aqueous stable colloidal nano-C60 aggregates exposed to TX100 micelles under different environmental conditions
Jing HUO,Ye YU,Ling GE,Bo ZHANG(),Yiliang HE
School of Environmental Science & Engineering, Shanghai Jiaotong University, Shanghai 200240, China
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Abstract

C60, as one of carbon nanomaterials widely used in various fields, could be released into the water environment thus exerting some potential health risks to human beings. This work examined the behavior of aqueous stable colloidal nano-C60 (nC60) aggregates under different environmental conditions including Polyethylene glycol octylphenol ether (TX100) micelles concentration, pH, and reaction time when exposed to TX100 micelles. Results show that the nC60 aggregates became more dispersive and restored the capability of generating the singlet oxygen when exposed to TX100 micelles. With the increase of TX100 concentration, smaller average size of nC60 aggregates was observed in dynamic light scattering (DLS) analysis, the fluorescence intensity of TX100 was more quenched by nC60 aggregates, and the kinetic rate constant of generating the singlet oxygen for nC60 aggregates was improved. The mean size of nC60 aggregates in the presence of TX100 had no obvious variations when the pH ranged from 4 to 8. The longer reaction time between nC60 aggregates and TX100 led to a higher kinetic rate constant of generating the singlet oxygen. Collective data suggest that variations in physicochemical properties of nC60 aggregates are strongly dependent on the surrounding media under different environmental conditions and directly govern nC60’s transport behavior and potential toxicity.
Keywords nano-C60 (nC60) aggregates      photochemical reactivity      artificial biological membrane     
Corresponding Author(s): Bo ZHANG   
Online First Date: 03 January 2014    Issue Date: 13 February 2015
 Cite this article:   
Jing HUO,Ye YU,Ling GE, et al. Behavior of aqueous stable colloidal nano-C60 aggregates exposed to TX100 micelles under different environmental conditions[J]. Front. Environ. Sci. Eng., 2015, 9(2): 197-205.
 URL:  
https://academic.hep.com.cn/fese/EN/10.1007/s11783-014-0624-6
https://academic.hep.com.cn/fese/EN/Y2015/V9/I2/197
sample TX100 concentration/(g·L-1) stirring time/h pH value stirring intensity/(r·min-1)
1 0.10 24 unadjusted 600
2 5.00 24 unadjusted 600
3 10.00 24 unadjusted 600
4 25.00 24 unadjusted 600
5 50.00 24 unadjusted 600
6 50.00 0 unadjusted 600
7 50.00 3 unadjusted 600
8 50.00 6 unadjusted 600
9 50.00 9 unadjusted 600
10 50.00 24 4 600
11 50.00 24 5 600
12 50.00 24 6 600
13 50.00 24 7 600
14 50.00 24 8 600
Tab.1  Preparation of TX100/nC60 samples
Fig.1  Characterization of nC60 aggregates in the absence of TX100 by DLS and TEM: a) DLS characterization of nC60; b) effect of pH on Z-average diameters (Z-ave) of nC60 sample; c) TEM images of nC60 aggregates
Fig.2  DLS analysis of nC60 samples after mixing with solution containing TX100 of different concentrations: a)<CMC; b)>CMC (All samples were magnetically stirred at 600 r·min-1 for 24 h)
Fig.3  Fluorescence intensity analysis of TX100 mixed with nC60 samples: a) fluorescence intensity of TX100 in the presence of nC60 (5 mg·L-1); b) reduced TX100 fluorescence intensity by nC60 at different concentration of TX100 (All samples were magnetically stirred at 600 r·min-1 for 24 h)
Fig.4  Photochemical reactivity of nC60 aggregates after mixing with solution containing TX100 of different concentrations: a) degradation rate of FFA; b) kinetic rate constant of FFA degradation (All samples were magnetically stirred at 600 r·min-1 for 24 h)
Fig.5  DLS analysis of nC60 aggregates after mixing 50.00 g·L-1 TX100 at different pH (All samples were magnetically stirred at 600 r·min-1 for 24 h)
Fig.6  Photochemical reactivity of nC60 aggregates after mixing 50.00 g·L-1 TX100 at different pH: a) degradation rate of FFA; b) kinetic rate constant of FFA degradation (All samples were magnetically stirred at 600 r·min-1 for 24 h)
Fig.7  Fluorescence analysis of nC60 aggregates after mixing 50.00 g·L-1 TX100 for different periods of time (All samples were magnetically stirred at 600 r·min-1)
Fig.8  Photochemical reactivity of nC60 aggregates after mixing 50.00 g·L-1 TX100 for different periods of time: (a) degradation rate of FFA; (b) kinetic rate constant of FFA degradation (All samples were magnetically stirred at 600 r·min-1)
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