The patent's inventors are Asiri,
This patent was filed on
From the background information supplied by the inventors, news correspondents obtained the following quote: "Environmental pollution has received considerable attention due to their harmful effect on human health and living organisms. The industrial progress causes several severe environmental problems by releasing wide range of toxic compound to the environment. Thousands of hazardous waste locations have been produced worldwide consequential from the accumulation of organic pollutants in soil and water over the years. Monitoring of environmental pollution is therefore one of the most important needs for selecting pollution controlling option. Among various pollutants, organic dyes are hazardous and toxic pollutants and have adverse effect on living organisms. Dyes are carcinogenic, hazardous, mutagenic, toxic (cytotoxic and embryo-toxic) to mammals. Thus dyes are risky and unsafe for human health and environment. Because of its high solubility and stability in water, it has been found in freshwater, marine environments and industrial waste waters and is difficult to degrade by traditional techniques.
"TiO.sub.2 and ZnO have proven their self as a dynamic photocatalyst. However these photocatalyst only encourage photocatalysis upon irradiation by UV light because it absorb only in the UV region of round about 375 nm with the band gap (.about.3.2 ev) in UV region. For solar light photocatalysis, a photocatalyst must promote photocatalysis by irradiation with solar light because solar light spectrum consists of 46% of solar light while the UV light is only 5-7% in the solar light spectrum. This least coverage of UV light in the solar spectrum, the high band gap energy (3.2 eV), and fast charge carrier recombination (within nanoseconds) of ZnO confines its extensive application in the solar light spectrum range.
"Several researchers have made and used catalysts to remove contaminants using UV light. Dom et al. (2011) synthesized MgFe.sub.2O.sub.4, ZnFe.sub.2O.sub.4 and CaFe.sub.2O.sub.4 by low temperature microwave sintering and applied for the photocatalytic degradation of organic pollutant using solar light. They found high photocatalytic performance of these oxides by degradation of methylene blue in the presence of solar light. Raja et al. (2007) reported a solar photocatalyst based on cobalt oxide and found to be a good solar photocatalyst for the degradation of azo-dye orange II. Wawrzyniak et al. (2006) have synthesized a solar photocatalyst based on TiO.sub.2 containing nitrogen and applied for the degradation of azo-dye which completely degraded under solar light. Wang et al. (2008) degraded L-acid up to 83% by using S-doped TiO.sub.2 under solar light. Mohapatra and Parida (2011) have synthesized Zn based layered double hydroxide and applied for the degradation and found that layered double hydroxide will be a prominent solar photocatalyst for the degradation of organic chemicals. Zhu et al. (2010) have developed several solar photocatalyst based on Sm.sup.3+, Nd.sup.3+, Ce.sup.3+ and Pr.sup.3+ doped titanium-silica and found as good applicants for industrial applications. Zhao et al. (2008) synthesized TiO.sub.2 modified solar photocatalyst and reported as good candidate for the photocatalytic degradation of plastic contaminants under solar light. Im et al. (2010) have synthesized hydrogel/TiO.sub.2 photocatalyst for the degradation of organic pollutants under solar light. Pelentridou et al. (2009) treated aqueous solutions of the herbicide azimsulfuron with titanium nanocrystalline films under solar light and found photo degradation of herbicide in few hours demonstrated titanium as best candidate for purification of water containing herbicide. However, there is a need for a catalyst that is cheaper and faster to operate for decontamination use."
Supplementing the background information on this patent, VerticalNews reporters also obtained the inventors' summary information for this patent: "The invention discloses a Fe doped ZnO nano-particle photocatalyst, a method of synthesizing Fe doped ZnO nano-particle photocatalyst. The instant invention also discloses a method of using the Fe doped ZnO nano-particle photocatalyst.
"In one embodiment, method of synthesizing Fe doped ZnO nano-particle photocatalyst is described. In another embodiment, a characterization of Fe doped ZnO nano-particle photocatalyst is described. In another embodiment, using the Fe doped ZnO nano-particle photocatalyst and activating the said catalyst using the solar light to degrade organic contaminant in a sample is described. The sample may be water resources for example.
"In one preferred embodiment, the synthesis and characterization of Fe doped ZnO nano-particle that can be used in a small amount in the degradation of organic pollutant is described. The present invention also presents the kinetics and mechanism of dye degradation using Fe doped ZnO nano-particle as solar light activated photocatalyst. The present invention also presents the photocatalytic activity of Fe doped ZnO nano-particle for degrading various dyes such as brilliant cresyl blue, indigo carmine and gentian violet.
"In another embodiment, characterizations of several properties of the novel Fe doped ZnO nano-particle photocatalyst were performed. These characterizations were performed to prove the efficacy and effectiveness of the novel photocatalyst.
"The novel Fe doped ZnO nano-particle photocatalyst composition, method of synthesizing the novel Fe doped ZnO nano-particle photocatalyst catalyst and method of using the novel Fe doped ZnO nano-particle photocatalyst in chemical reactions, disclosed herein, may be implemented in any means for achieving various aspects. Other features will be apparent from the accompanying figures and from the detailed description that follows."
For the URL and additional information on this patent, see: Asiri,
Keywords for this news article include: Titanium, Herbicides, Pesticides, Light Metals, Photocatalyst, Nanotechnology, Photocatalytic, Emerging Technologies,
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