Facile Preparation of Protonated g-C3N4 Nanobelts in Concentrated Sulfuric Acid with Enhanced UV Light Photocatalytic Activity for Photodegradation of Organic Dyes†

doi:10.7503/cjcu20180460

Abstract

Abstract:

Graphitic carbon nitride(g-C₃N₄) nanobelts were prepared by a simple method which involves exfoliating bulk g-C₃N₄ in concentrated H₂SO₄ due to the strong protonation ability and rapid hydration heat effect of 98% H₂SO₄ when mixed with water. The obtained samples were characterized by means of X-ray diffraction(XRD), scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR), UV-Vis diffuse reflectance spectroscopy(UV-Vis DRS) and photoluminescence(PL) spectroscopy. The characterization results revealed that a significant protonation occurs between the g-C₃N₄ and H₂SO₄ moleculars, making the band gap of the as-prepared g-C₃N₄-H₂SO₄ nanobelts much larger than that of the bulk g-C₃N₄. Therefore, the UV light adsorption was greatly improved compared to that of bulk g-C₃N₄, and the electron-hole recombination was also reduced after the modification process. Methylene blue(MB) dye was used as the target pollutant to further investigate the UV photoactivity of the g-C₃N₄-H₂SO₄ nanobelt samples. It was found that the protonated nanobelts can decompose almost 100% of MB within 2 h, much superior to the bulk g-C₃N₄ under UV light.

Key words: Graphitic carbon nitride(g-C₃N₄), Concentrated H₂SO₄, Rapid exfoliation, Photocatalysis

CLC Number:

O644

TrendMD:

LI Jiaojiao,ZHAO Weifeng,ZHANG Gai,MA Aijie,CHEN Weixing,ZHOU Hongwei. Facile Preparation of Protonated g-C₃N₄ Nanobelts in Concentrated Sulfuric Acid with Enhanced UV Light Photocatalytic Activity for Photodegradation of Organic Dyes^†[J]. Chem. J. Chinese Universities, 2018, 39(12): 2719.

Figures/Tables 8

Fig.1 Preparation process of g-C3N4 nanobelts

Fig.2 FTIR spectra of bulk g-C3N4 and the g-C3N4-H2SO4 nanobeltsa. Bulk g-C3N4; b. g-C3N4-10H2SO4;c. g-C3N4-15H2SO4; d. g-C3N4-20H2SO4.

Fig.3 XRD patterns of bulk g-C3N4 and g-C3N4-H2SO4 nanobeltsa. Bulk g-C3N4; b. g-C3N4-10H2SO4;c. g-C3N4-15H2SO4; d. g-C3N4-20H2SO4.

Fig.4 SEM images of bulk g-C3N4(A) and g-C3N4-10H2SO4 nanobelts(B, C) and TEM image of g-C3N4-10H2SO4 nanobelts(D)

Fig.5 UV-Vis diffuse reflection spectra of bulk g-C3N4 and g-C3N4-H2SO4 nanobelts

Fig.6 Photoluminescence spectra of bulk g-C3N4(a) and g-C3N4-10H2SO4 nanobelts(b)

Fig.7 Degradation of MB curves of bulk g-C3N4 and g-C3N4-H2SO4 nanobelts under UV light irradiation

Fig.8 Degradation MB kinetic equation fitting curve of bulk g-C3N4 and g-C3N4-H2SO4 nanobelts

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Facile Preparation of Protonated g-C₃N₄ Nanobelts in Concentrated Sulfuric Acid with Enhanced UV Light Photocatalytic Activity for Photodegradation of Organic Dyes^†

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