Synthesis and Photocatalytic Properties of the Composites Between Carbon Dots and Silver Nanostructures†

doi:10.7503/cjcu20130781

Abstract

Abstract:

The composites between carbon dots and silver nanostructures(CDs/Ag) were synthesized by in-situ synthesis and simple mixing, respectively. The products obtained by in-situ synthesis exhibit stronger light absorption and higher photocatalytic activity for methylene blue(MB) degradation than those of simple mixing. The effects of H₂O₂ addition and the fluorescence intensity of CDs on photocatalytic activities of the obtained CDs/Ag were analyzed. The experimental results indicate that the amount of H₂O₂ addition can change the morphology and light absorption of CDs/Ag, and then results in different photocatalytic performances. On the other hand, the CDs/Ag obtained from CDs with stronger fluorescence emission shows stronger light absorption and higher photocatalytic activities. The possible mechanism of photocatalytic activities of the in-situ synthesized CDs/Ag could be that strong combination between CDs and Ag nanocrystals induced much stronger surface plasma resonance, thus enhancing light absorption and the light energy conversion efficiency.

Key words: Carbon dots, Siliver nanostructure, in-situ Synthesis, Photocatalytic property

CLC Number:

O613
O644

TrendMD:

WU Lingling, TIAN Ruixue, ZHAO Qing, CHANG Qing, HU Shengliang. Synthesis and Photocatalytic Properties of the Composites Between Carbon Dots and Silver Nanostructures^†[J]. Chem. J. Chinese Universities, 2014, 35(4): 717.

Figures/Tables 9

Fig.1 UV-Vis spectra(A) and photocatalytic activities(B) of CDs/Ag obtained by in-situ synthesis(a) and simple mixing(b)

Fig.2 TEM(A, C) and HRTEM(B, D) images of CDs/Ag obtained by in-situ synthesis(A, B), by simple mixing(C, D) Insets in (A) and (C) are TEM images of typical single CDs/Ag obtained by in-situ synthesis and simple mixing.

Fig.3 UV-Vis spectra of CDs/Ag obtained by in-situ synthesis and Aga. CDs/Ag(0 μL H2O2); b. Ag(0 μL H2O2); c. CDs/Ag(30 μL H2O2); d. Ag(30 μL H2O2); e. CDs/Ag(60 μL H2O2); f. Ag(60 μL H2O2).

Fig.4 TEM images of single CDs/Ag(0 μL H2O2)(A), CDs/Ag(30 μL H2O2)(B) and CDs/Ag(60 μL H2O2)(C)

Fig.5 Photocatalytic activities of CDs/Ag obtained by in-situ synthesis and Ag

Fig.6 Fluorescence spectra of the visible-light irradiated CDs/Ag and Ag in TA at different irradiation time (A) Ag(0 μL H2O2); (B) Ag(60 μL H2O2); (C) CDs/Ag(0 μL H2O2); (D) CDs/Ag(60 μL H2O2).

Fig.7 Fluorescence spectra of CDs-1(a, c) and CDs-2(b, d)a, b: Excitation; c, d: emission.

Fig.8 UV-Vis spectra of CDs-1/Ag(0 μL H2O2)(a), CDs-2/Ag(0 μL H2O2)(b), CDs-1/Ag(30 μL H2O2)(c), CDs-2/Ag(30 μL H2O2)(d), CDs-1/Ag(60 μL H2O2)(e), CDs-2/Ag(60 μL H2O2)(f)

Fig.9 Photocatalytic activities of CDs-1/Ag and CDs-2/Ag

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