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Huo-Gen Yu

Bio: Huo-Gen Yu is an academic researcher from The Chinese University of Hong Kong. The author has contributed to research in topics: Fourier transform infrared spectroscopy & X-ray photoelectron spectroscopy. The author has an hindex of 2, co-authored 2 publications receiving 1055 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a liquid-phase deposition (LPD) method was used on fused quartz by the liquid phase deposition method from a (NH4)2TiF6 aqueous solution upon addition of boric acid (H3BO3) and calcined at various temperatures.
Abstract: TiO2 thin films were prepared on fused quartz by the liquid-phase deposition (LPD) method from a (NH4)2TiF6 aqueous solution upon addition of boric acid (H3BO3) and calcined at various temperatures. The as-prepared films were characterized with thermogravimetry (TG), Fourier transform infrared spectra (FTIR), X-ray diffraction (XRD), UV−Visible spectrophotometry (UV−Vis), scanning electron microscopy (SEM), photoluminescence spectra (PL), and X-ray photoelectron spectroscopy (XPS), respectively. The photocatalytic activity of the samples was evaluated by photocatalytic decolorization of methyl orange aqueous solution. It was found that the as-prepared TiO2 thin films contained not only Ti and O elements, but also a small amount of F, N, and Si elements. The F and N came from the precursor solution, and the amount of F decreased with increasing calcination temperature. Two sources of Si were identified. One was from the SiF62- ions, which were formed by a reaction between the treatment solution and quartz ...

1,111 citations

Patent
11 Jul 2007
TL;DR: In this article, a method for using vanadia nanometer band as template to produce one-dimensional TiO2 hollow optical catalyst, wherein said method comprises that: dissolving titanium tetrafluoride into deionized water; immerges the vanadia Nanometer band into said solution to be treated at low temperature to obtain the final catalyst.
Abstract: The invention relates to a method for using vanadia nanometer band as template to produce one-dimension TiO2 hollow optical catalyst, wherein said method comprises that: dissolving titanium tetrafluoride into deionized water; immerges the vanadia nanometer band into said solution to be treated at low temperature to obtain the final catalyst. The invention uses vanadia nanometer band template to induce the deposition of TiO2 nanometer particle to form corn-frame structure and the vanadia nanometer band template is dissolved by HF to form hollow structure. The inventive method can simplify the TiO2 surface deposition (or growth) and template removing process, to overcome the group and hard separate problems of powder optical catalyst.

4 citations


Cited by
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Journal ArticleDOI
TL;DR: This review encompasses several advancements made in these aspects of titania, and also some of the new physical insights related to the charge transfer events like charge carrier generation, trapping, detrapping, and their transfer to surface are discussed for each strategy of the modified titania to support the conclusions derived.
Abstract: Titania is one of the most widely used benchmark standard photocatalysts in the field of environmental applications. However, the large band gap of titania and massive recombination of photogenerated charge carriers limit its overall photocatalytic efficiency. The former can be overcome by modifying the electronic band structure of titania including various strategies like coupling with a narrow band gap semiconductor, metal ion/nonmetal ion doping, codoping with two or more foreign ions, surface sensitization by organic dyes or metal complexes, and noble metal deposition. The latter can be corrected by changing the surface properties of titania by fluorination or sulfation or by the addition of suitable electron acceptors besides molecular oxygen in the reaction medium. This review encompasses several advancements made in these aspects, and also some of the new physical insights related to the charge transfer events like charge carrier generation, trapping, detrapping, and their transfer to surface are d...

1,728 citations

Journal ArticleDOI
TL;DR: In this article, the photoluminescence (PL) performance and mechanism of nano-sized semiconductor materials, such as TiO 2 and ZnO, are introduced, together with their attributes and affecting factors.

1,578 citations

Journal ArticleDOI
TL;DR: For the first time, a direct g-C3N4-TiO2 Z-scheme photocatalyst without an electron mediator was prepared by a facile calcination route utilizing affordable P25 and urea as the feedstocks and will provide new insights into the design of high-performance Z-Scheme photoc atalysts for indoor air purification.
Abstract: Formaldehyde (HCHO) is a major indoor pollutant and long-term exposure to HCHO may cause health problems such as nasal tumors and skin irritation. Photocatalytic oxidation is considered as the most promising strategy for the decomposition of HCHO. Herein, for the first time, a direct g-C3N4–TiO2 Z-scheme photocatalyst without an electron mediator was prepared by a facile calcination route utilizing affordable P25 and urea as the feedstocks. Photocatalytic activities of the as-prepared samples were evaluated by the photocatalytic oxidation decomposition of HCHO in air. It was shown that the photocatalytic activity of the prepared Z-scheme photocatalysts was highly dependent on the g-C3N4 content. At the optimal g-C3N4 content (sample U100 in this study), the apparent reaction rate constant was 7.36 × 10−2 min−1 for HCHO decomposition, which exceeded that of pure P25 (3.53 × 10−2 min−1) by a factor of 2.1. The enhanced photocatalytic activity could be ascribed to the formation of a g-C3N4–TiO2 Z-scheme photocatalyst, which results in the efficient space separation of photo-induced charge carriers. Considering the ease of the preparation method, this work will provide new insights into the design of high-performance Z-scheme photocatalysts for indoor air purification.

1,112 citations

Journal ArticleDOI
TL;DR: Results show that hollow spheres can be more readily separated from the slurry system by filtration or sedimentation after photocatalytic reaction and reused than conventional powder photocatalyst, confirming ZnO hollow spheres is stability and not photocorroded.
Abstract: ZnO hollow spheres with porous crystalline shells were one-pot fabricated by hydrothermal treatment of glucose/ZnCl2 mixtures at 180 °C for 24 h, and then calcined at different temperatures for 4 h. The as-prepared samples were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption−desorption isotherms. The photocatalytic activity of the as-prepared samples was evaluated by photocatalytic decolorization of Rhodamine B aqueous solution at ambient temperature. The results indicated that the average crystallite size, shell thickness, specific surface areas, pore structures, and photocatalytic activity of ZnO hollow spheres could be controlled by varying the molar ratio of glucose to zinc ions (R). With increasing R, the photocatalytic activity increases and reaches a maximum value at R = 15, which can be attributed to the combined effects of several factors such as specific surface area, the porous structure and the crystallite size. Further...

765 citations

Journal ArticleDOI
TL;DR: In this paper, a review of water treatment technologies, such as biological treatment, coagulation/precipitation techniques, Fenton oxidation treatments, and advanced oxidation techniques, have been assessed to address the worsening clean water shortage.

693 citations