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Photocatalytic metal oxide nanomaterials, preparing method utilizing H2-plasma, and use for purification of organic waste in water

A nanomaterial, plasma technology, applied in TiO2 nanomaterials, the starting material of nanomaterials is white TiO, which can solve the problems of changing the stoichiometry of nanomaterials, not seeing enough improvement in visible light and IR light absorption, etc.

Inactive Publication Date: 2014-09-10
NAT UNIV OF SINGAPORE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although metallic and non-metallic dopants have been used to increase the donor and acceptor states in the bandgap, no sufficient improvement in the visible and IR light absorption of this material has been seen
More dramatic improvements in the visible and IR light absorption of these nanoparticles come from engineering defects into the nanoparticle surface [7,8], however, these approaches exhibit the disadvantage of altering the stoichiometry of the nanomaterials.

Method used

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  • Photocatalytic metal oxide nanomaterials, preparing method utilizing H2-plasma, and use for purification of organic waste in water
  • Photocatalytic metal oxide nanomaterials, preparing method utilizing H2-plasma, and use for purification of organic waste in water
  • Photocatalytic metal oxide nanomaterials, preparing method utilizing H2-plasma, and use for purification of organic waste in water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] Example 1: Black TiO 2 Nanoparticle Production

[0072] 500 mg of commercially available white anatase TiO 2 Particles (MTI Corporation, average particle size about 8 nm to 10 nm) were placed in a plasma enhanced chemical vapor deposition (PECVD) chamber. At a temperature of 720°C, 10 -4 atmospheres to 10 -3 Hydrogen gas was introduced with a flow rate of 60 sccm under a low pressure of 1 atmosphere and an RF plasma of 110 W. A black powder was collected after 8 hours.

Embodiment 2

[0073] Example 2: Black TiO 2 Characteristics and Structure of Nanoparticles

[0074] through as Figure 4 XRD as shown and as Figure 5 The Raman spectrum shown to evaluate the black TiO 2 Crystal structure of nanoparticles. X-ray diffraction (XRD) was performed on a Bruker AXS D8 system using Cu Ka radiation. Use Ar + (514.5nm) laser excitation source was used for micro-Raman scattering analysis at room temperature by Renishaw spectrometer. X-ray photoelectron spectroscopy (XPS) was carried out in a domestic ultra-high vacuum system with an Omicron double-anode X-ray gun. like Figure 4 and Figure 5 Shown, H 2 - Plasma treatment does not affect TiO 2 The crystal structure of the nanoparticles, and they are still in their original anatase phase. Measured from XPS ( Figure 6A and 6B ), we do not observe TiO 2 Any reduced chemical state of Ti, such as Ti 3+ . This shows that H 2 -Plasma treatment mainly on TiO 2 The formation of defects associated with bandg...

Embodiment 3

[0075] Embodiment 3: Photocatalytic decomposition of methylene blue

[0076] Abet technologies sun2000 solar simulator (100mW / cm 2 ) for photocatalytic degradation of methylene blue under visible light irradiation by filtering out incident light with a wavelength shorter than 425 nm. In a typical experiment, 10 mg of white TiO 2 or black TiO 2 Add to an aqueous solution (30 mL) containing 5 mg / L methylene blue. The mixed solution was placed in a 50 ml flask and stirred with a magnetic stirrer. A circulating water jacket was used to maintain the temperature of the beaker at approximately 25°C during irradiation. After a given irradiation time, an ultraviolet-visible absorption spectrum (Shimadzu UV3600) was measured to estimate the residual concentration of methylene blue in the solution by integration of absorption peaks.

[0077] Figure 7 shown in the absence of any TiO 2 compared to the case of nanoparticles using 0.2 mg of black TiO 2 and white TiO 2 Digital pictu...

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Abstract

The present invention is directed to black TiO2 nanoparticles having H2-plasma induced surface defects. The surface defects generate mid-band gap states, which enable the black TiO2 nanoparticles to absorb visible and IR light. The enhanced visible and IR light absorption allows the black TiO2 nanoparticles to serve as photocatalysts in the solar-induced decomposition of pollutant organic compounds in water, an important application in water treatment systems. The present invention is further directed to a method of generating the black TiO2 nanoparticles utilizing H2-plasma to introduce surface defects without changing the oxidation state of the titanium in the nanomaterial.

Description

[0001] related application [0002] This application claims the benefit of US Provisional Application No. 61 / 568,246, filed December 8, 2011. The entire teachings of the above applications are incorporated herein by reference. Background technique [0003] Groundwater contamination by hazardous organic compounds (eg, industrial dyes, gasoline, and other petroleum-derived hydrocarbons) is becoming a global problem [1, 2]. In the past, conventional biological and physical treatment methods (eg, adsorption, ultrafiltration, and coacervation) were widely utilized techniques to remove organic pollutants from various water or wastewater. However, the decontamination of many emerging anthropogenic organic pollutants, especially those that are highly toxic at very low concentrations, requires new technologies to chemically transform the pollutants into harmless compounds [2]. [0004] Recently, efforts have been made to investigate the purification of organic pollutants in water by ...

Claims

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Application Information

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IPC IPC(8): B01J35/10B01J21/06B01D53/86C01G23/047C02F1/30B01J19/08
CPCC01G23/047C01G15/00Y02E60/364C02F1/32C01P2006/14C01P2004/16C02F2101/308C01G19/02C01P2002/84B01J35/0013C01P2006/12C01P2002/82C02F2101/32C01P2006/60C02F2305/08B82Y30/00C02F1/725B01J35/002B01J35/004C02F2103/06C01P2002/72B01J21/063B01J37/349C02F2103/003C02F1/30C01B3/042C01G23/08C01G41/02C01P2002/85C01G9/02C02F2305/10C01P2004/13Y02W10/37Y02E60/36B01J35/30B01J35/23B01J35/39
Inventor 陈伟饶日川
Owner NAT UNIV OF SINGAPORE
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