Preparation and Visible Light Photocatalytic Properties of Nitrogen and Carbon Co-doped TiO2 Nanocrystalline

doi:10.7503/cjcu20120318

Abstract

Abstract:

Nitrogen and carbon co-doped TiO₂ nanocrystalline(N-C-TiO₂) photocatalyst was prepared by a new method of sol-gel process using titanium n-butoxide [Ti(OC₄H₉)₄] as raw materials, acetic acid(HAc) as a modifier, and ammonium carbonate(C₂H₁₁N₃O₅) as solid substrates. The samples were characterized by thermogravimetric analysis(TGA), transmission electron microscopy(TEM), X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS) and N₂ adsorption-desorption isotherms analysis. The hydrous TiO₂ particles were deposited onto the surface of ultrafine ammonium salt particles during hydrolysis of Ti(OC₄H₉)₄. When the complex dry gel was calcined at lower temperature(300℃), the hydrous TiO₂ particles dehydrated and crystallized, and the N and C atoms diffuse into crystal lattice of TiO₂.The thermal dissociation of ammonium salt can control the particle size and inhibit the agglomeration of anatase TiO₂ in the calcining process and simultaneously enhance phase transformation from amorphous TiO₂ to anatase phase. The N-C-TiO₂ samples have smaller particle sizes, lower agglomeration and large specific surface area, which exhibit significantly higher photocatalytic activity than the P25 on the degradation of rhodamine B(RB) in water under visible light irradiation.

Key words: Sol-gel method, N and C co-doped, TiO₂ nanocrystalline, Photocatalyst

CLC Number:

O643

TrendMD:

HARI Bala, GUO Jin-Yu, Aruna, YUAN Guang-Yu, ZHANG Zhan-Ying, LIU Zong-Rui. Preparation and Visible Light Photocatalytic Properties of Nitrogen and Carbon Co-doped TiO₂ Nanocrystalline[J]. Chem. J. Chinese Universities, 2012, 33(12): 2716.

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Preparation and Visible Light Photocatalytic Properties of Nitrogen and Carbon Co-doped TiO₂ Nanocrystalline

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