Zn-doped TiO2 nanoparticles with high photocatalytic activity synthesized by hydrogen–oxygen diffusion flame

Zhao, Yin; Li, Chunzhong; Liu, Xiuhong; Gu, Feng; Du, Hailiang; Shi, Liyi

doi:10.1016/j.apcatb.2007.09.044

Cited by 215 publications

(112 citation statements)

References 30 publications

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“…However, impurities such as Zr, Nb and Fe remain in the product (Table 1). These impurities will usually embed themselves in the Ti-O matrix in the form of subsitutional impurities, altering properties such as mechanical strength, band gaps and reactivity [16][17][18]. Figure 2 details the XRD of all three compounds.…”

Section: Resultsmentioning

confidence: 99%

Characterization of Titania Nanoparticles Synthesized by the Hydrothermal Method with Low Grade Mineral Precursors

Mahdi

Shukor

Meor

et al. 2012

JNanoR

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Abstract. The objective of this work is to utilize a low-grade synthetic rutile to produce high-grade titania nanoparticles. Due to the nature of the precursor, the hydrothermal method needs modification in order to accommodate the precursors and chemical reagents. The product will be characterized with the XRD (crystallite size and crystallinity), EDXRF (chemical composition), SEM (Morphology), N 2 adsorption-desorption (Surface Area) and UV-Vis-NIR. Results revealed a crystallite size of less than 20 nm, a surface area of 186.8 m 2 /g, a morphology that is a combination of agglomeration and particles, and an optical band gap of 3.23 eV. It is concluded that synthetic rutile is a viable precursor to produce high quality titania nanoparticles.

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Section: Resultsmentioning

confidence: 99%

Characterization of Titania Nanoparticles Synthesized by the Hydrothermal Method with Low Grade Mineral Precursors

Mahdi

Shukor

Meor

et al. 2012

JNanoR

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“…Dopant not only shifts the absorption edge of TiO 2 to the visible region but also act as efficient trap centers of carriers inhibiting charge carrier recombination (Yang et al 2010;Jagadale et al 2008). There are, however, reports where researchers have attributed that oxygen vacancies generated on doping enhances the photoactivity of TiO 2 (Ihara et al 2003;Yu et al 2002;Zhao et al 2008). Ihara et al (2003) claimed that oxygen vacancies contribute to the visible light photoactivity and N doping only enhances the stabilization of these oxygen vacancies.…”

Section: Introductionmentioning

confidence: 99%

Shallow and deep trap emission and luminescence quenching of TiO2 nanoparticles on Cu doping

2013

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TiO 2 nanoparticles with 2 and 4 % Cu are synthesized by sol-gel method. The crystalline phase and size of the nanoparticles are investigated with X-ray diffraction and transmission electron microscope. Cu-doped TiO 2 has an extended absorption ranging from UV to visible region. Doping of Cu disturbs the arrangement of oxygen ions around Ti 4? and generates oxygen vacancies. These oxygen vacancies capture electrons and form some ionized oxygen vacancy centers or F centers. These F centers form subband states extending from shallow to the deep level in the band gap of TiO 2 . The visible emission peaks of pure and doped TiO 2 are mainly associated with self-trapped excitons (STEs) and F centers. We have observed that Auger type nonradiative recombination is responsible for the quenching of the UV and STE emission peak in the doped samples. The intense visible emission peaks in pure TiO 2 are due to shallow type centers whereas deep trap emission is predominant in doped samples. The intensity of UV and visible emission peaks are quenched with the increase in the doping level of Cu. Defects, Cu dstates, band structure of TiO 2 and low mobility of the carriers are responsible for the quenching of the emission peaks.

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“…The physical and chemical properties of TiO 2 in the nanometer size range depend on phase composition, grain size, and dispersity [17]. Nanosized TiO 2 crystals, of less than 10 nm, show significant differences with the bulk TiO 2 in many aspects due to the quantum size effect [18,19].…”

Section: Introductionmentioning

confidence: 99%

Preparation of nanostructured TiO2-based photocatalyst by controlling the calcining temperature and pH

et al. 2012

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Nanostructured TiO 2 has been synthesized using one-step sol-gel method and characterized by different characterization techniques (SEM, EDS, XRD, and UV-vis spectroscopy). The photocatalytic degradation of methylene blue (MB) and Congo red (CR) is studied with the synthesized TiO 2 . The photocatalytic degradation data has been validated using several kinetic models. The TiO 2 showed efficient photocatalytic degradation performance on MB and CR. In addition to this, the effect of pH on the photocatalytic degradation has been investigated. The TiO 2 showed enhanced photocatalytic performance in basic media than that in neutral or acidic ones.

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Zn-doped TiO2 nanoparticles with high photocatalytic activity synthesized by hydrogen–oxygen diffusion flame

Cited by 215 publications

References 30 publications

Characterization of Titania Nanoparticles Synthesized by the Hydrothermal Method with Low Grade Mineral Precursors

Characterization of Titania Nanoparticles Synthesized by the Hydrothermal Method with Low Grade Mineral Precursors

Shallow and deep trap emission and luminescence quenching of TiO2 nanoparticles on Cu doping

Preparation of nanostructured TiO2-based photocatalyst by controlling the calcining temperature and pH

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