Patents Assigned to Aqua Diagnostic Pty Ltd
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Patent number: 8673810Abstract: Methods of fabricating nano particulate Titanium dioxide photocatalysts onto a conducting substrate are disclosed. The methods include hydrothermal fabrications with heat treatment steps to increase the crystallinity and photoactivity of the titanium dioxide layers.Type: GrantFiled: November 14, 2008Date of Patent: March 18, 2014Assignee: Aqua Diagnostic Pty Ltd.Inventors: Huijun Zhao, Mark Imisides, Shanqing Zhang
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Publication number: 20120010068Abstract: Methods of fabricating nano particulate Titanium dioxide photocatalysts onto a conducting substrate are disclosed. The methods include hydrothermal fabrications with heat treatment steps to increase the crystallinity and photoactivity of the titanium dioxide layers.Type: ApplicationFiled: November 14, 2008Publication date: January 12, 2012Applicant: Aqua Diagnostic Pty Ltd Level 1Inventors: Huijun Zhao, Mark Imisides, Shanqing Zhang
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Publication number: 20120000794Abstract: A method of determining chemical oxygen demand (COD) of a water sample, which is useful in an on-line configuration comprising the steps of a) applying a constant potential bias to a photoelectrochemical cell, having a photoactive working electrode, optionally a reference electrode and a counter electrode, and containing a supporting electrolyte solution; b) illuminating the working electrode with a light source and recording the background photocurrent produced at the working electrode from the supporting electrolyte solution; c) adding a water sample, to be analysed, to the photoelectrochemical cell; d) illuminating the working electrode with a light source and recording the hydro dynamic photocurrent produced under continuous flow of the water to be analysed; e) determining the chemical oxygen demand of the water sample using a number of different formulae. The applied potential is preferably from ?0.4 to +O.8V more preferably about +0.3V.Type: ApplicationFiled: December 21, 2007Publication date: January 5, 2012Applicant: AQUA DIAGNOSTIC PTY LTDInventors: Huijun Zhao, Shanqing Zhang, Nicholas George Mathiou
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Publication number: 20110073495Abstract: A method of determining chemical oxygen demand (COD) of a water sample which is useful in a probe configuration includes the steps of a) applying a constant potential bias to a photoelectmchemical cell, having a photoactive working electrode optionally a reference electrode and a counter electrode, and containing a supporting electrolyte solution; b) illuminating the working electrode with a light source and recording the background photocurrent produced at the working electrode from the supporting electrolyte solution; c) adding a water sample, to be analysed, to the photoelectrochemical cell; d) illuminating the working electrode with a light source and recording the steady state photocurrent produced with the sample; e) determining the chemical oxygen demand of the water sample using the formula (I): where ? is the Nernst diffusion layer thickness, D is the diffusion coefficient, A is the electrode area, F the Faraday constant and iss the steady state photocurrent.Type: ApplicationFiled: December 21, 2007Publication date: March 31, 2011Applicant: AQUA DIAGNOSTIC PTY LTDInventors: Huijun Zhao, Shanqing Zhang
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Patent number: 7759125Abstract: A photoelectrochemical assay apparatus and method for determining chemical oxygen demand (COD) of a water sample is described. The photoelectrochemical assay comprises: a) a measuring cell for holding a sample to be analysed b) a titanium dioxide nanoparticle photoelectric working electrode and a counter electrode disposed in said cell, c) a UV light source adapted to illuminate the photoelectric working electrode d) control means to control the illumination of the working electrode e) potential measuring means to measure the electrical potential at the working and counter electrodes f) analysis means to derive a measure of oxygen demand from the measurements made by the potential measuring means.Type: GrantFiled: August 11, 2009Date of Patent: July 20, 2010Assignee: Aqua Diagnostic Pty LtdInventor: Huijun Zhao
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Publication number: 20100032282Abstract: A photoelectrochemical assay apparatus and method for determining chemical oxygen demand (COD) of a water sample is described. The photoelectrochemical assay comprises: a) a measuring cell for holding a sample to be analysed b) a titanium dioxide nanoparticle photoelectric working electrode and a counter electrode disposed in said cell, c) a UV light source adapted to illuminate the photoelectric working electrode d) control means to control the illumination of the working electrode e) potential measuring means to measure the electrical potential at the working and counter electrodes f) analysis means to derive a measure of oxygen demand from the measurements made by the potential measuring means.Type: ApplicationFiled: August 11, 2009Publication date: February 11, 2010Applicant: Aqua Diagnostic Pty LtdInventor: Huijun ZHAO
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Publication number: 20090283423Abstract: A method of determining chemical oxygen demand in water samples containing chloride ions above 0.5 mM concentration in which the samples are diluted and a known quantity of an organic substance is added to the diluted sample which is the subjected to an assay by a photoelectrochemical method using a titanium dioxide nanoparticulate semiconductor electrode and measuring the photo current produced until a stable value is reached and then using the difference between the initial and stable photocurrents as a measure of the chemical oxygen demand. An alternative method involves determining chemical oxygen demand in water samples containing chloride ions by measuring the chlorine content and measuring chemical oxygen demand by a photoelectrochemical method using a titanium dioxide nanoparticulate semiconductor electrode and adjusting the chemical oxygen demand measurement using the chlorine measurement.Type: ApplicationFiled: August 10, 2006Publication date: November 19, 2009Applicant: Aqua Diagnostic Pty LtdInventors: Huijun Zhao, Shanqing Zhang
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Patent number: 7598086Abstract: A photoelectrochemical assay apparatus for determining chemical oxygen demand (COD) of a water sample which consists of a) a measuring cell for holding a sample to be analysed b) a titanium dioxide nanoparticle photoelectric working electrode and a counter electrode disposed in said cell, c) a UV light source adapted to illuminate the photoelectric working electrode d) control means to control the illumination of the working electrode e) potential measuring means to measure the electrical potential at the working and counter electrodes f) analysis means to derive a measure of oxygen demand from the measurements made by the potential measuring means.Type: GrantFiled: November 10, 2005Date of Patent: October 6, 2009Assignee: Aqua Diagnostic Pty LtdInventor: Huijun Zhao
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Publication number: 20060240558Abstract: A photoelectrochemical assay apparatus for determining chemical oxygen demand (COD) of a water sample which consists of a) a measuring cell for holding a sample to be analysed b) a titanium dioxide nanoparticle photoelectric working electrode and a counter electrode disposed in said cell, c) a UV light source adapted to illuminate the photoelectric working electrode d) control means to control the illumination of the working electrode e) potential measuring means to measure the electrical potential at the working and counter electrodes f) analysis means to derive a measure of oxygen demand from the measurements made by the potential measuring means.Type: ApplicationFiled: November 10, 2005Publication date: October 26, 2006Applicant: Aqua Diagnostic Pty LtdInventor: Huijun Zhao