Patents by Inventor Paul K. Westerhoff

Paul K. Westerhoff has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 10927016
    Abstract: Preparing a porous hybrid media includes contacting porous media (e.g., strong base ion-exchange media) with an aqueous solution including aluminum ions to yield a aluminum-ion-containing porous media, contacting the aluminum-ion containing porous media with a reducing agent to impregnate elemental aluminum in the porous media, and oxidizing the elemental aluminum to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. In some cases, a pH of an aqueous mixture including the aluminum-ion-containing porous media may be adjusted to form a floc including aluminum hydroxide, and the aluminum hydroxide-containing porous media may be contacted with a reducing agent to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. The porous hybrid media may advantageously be prepared at low temperature (e.g., room temperature).
    Type: Grant
    Filed: October 7, 2019
    Date of Patent: February 23, 2021
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Kiril D. Hristovski, Jasmina Markovski, Paul K. Westerhoff, Shahnawaz Sinha
  • Publication number: 20210032130
    Abstract: A reactor for water splitting or water treatment includes a first electrode, a second electrode electrically coupled to the first electrode, and a proton exchange membrane separating the first electrode and the second electrode. The first electrode includes a first optical fiber coated with a photocatalytic material.
    Type: Application
    Filed: October 5, 2020
    Publication date: February 4, 2021
    Inventors: Paul K. Westerhoff, Kiril D. Hristovski, Shahnawaz Sinha
  • Patent number: 10823649
    Abstract: A microfluidic device includes a sample inlet for a fluid sample, a degassing chamber having a gas-permeable membrane and defining first and second portions separated by the gas permeable membrane, and a detection chamber. The sample inlet and the detection chamber are fluidly coupled to the first and second portions, respectively of the degassing chamber. The detection chamber is operably coupled to a light source and a detector. Assessing a concentration of chlorine gas in an aqueous sample includes providing an aqueous sample to a microfluidic device, separating gas from the aqueous sample in the microfluidic device, providing the gas to a detector, assessing the absorbance of the gas sample at a known absorption wavelength of chlorine, and based on the assessed absorbance of the gas sample at the known absorption wavelength of chlorine, assessing a concentration of chlorine gas in the aqueous sample.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: November 3, 2020
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Paul K. Westerhoff, Shahnawaz Sinha, Treavor Boyer
  • Patent number: 10793449
    Abstract: A reactor for water splitting or water treatment includes a first electrode, a second electrode electrically coupled to the first electrode, and a proton exchange membrane separating the first electrode and the second electrode. The first electrode includes a first optical fiber coated with a photocatalytic material.
    Type: Grant
    Filed: April 27, 2017
    Date of Patent: October 6, 2020
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Paul K. Westerhoff, Kiril D. Hristovski, Shahnawaz Sinha
  • Patent number: 10787374
    Abstract: Compositions for bromide removal include a two-dimensional material impregnated with silver. The silver may be impregnated in the two-dimensional material by contacting the two-dimensional material with silver ions in an aqueous solution, allowing the silver ions to adsorb on the two-dimensional material, and drying the two-dimensional material. Removing bromide from an aqueous composition including bromide may include contacting the aqueous composition with a two-dimensional material impregnated with silver, and allowing the bromide to react with the silver to yield silver bromide.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: September 29, 2020
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Francois Perreault, Paul K. Westerhoff, Onur Guven Apul, Shahnawaz Sinha
  • Publication number: 20200290014
    Abstract: A method for preparing a nano-enabled activated carbon block, a nano-enabled activated carbon block produced by the method, a household water filtration system comprising the nano-enabled activated carbon block, and a method for filtering tap water using the household water filtration system are provided. The method includes contacting a solution including a metal(lic) precursor (e.g. a titanium compound and/or an iron compound and/or a zirconium compound) with activated carbon particles such that the solution fills pores of the activated carbon particles. The method further includes causing a metal (hydr)oxide (e.g. titanium dioxide and/or zirconium dioxide and/or iron oxide) to precipitate from the solution thereby causing metal oxide nanoparticles to become deposited within pores of the activated carbon particles. The method also includes preparing a nano-enabled activated carbon block from the activated carbon particles having metal oxide nanoparticles deposited within the pores thereof.
    Type: Application
    Filed: March 15, 2019
    Publication date: September 17, 2020
    Inventors: Zhenxiao CAI, Scott A. MOLLEMA, Ariel J. ATKINSON, Kiril D. HRISTOVSKI, Jasmina S. MARKOVSKI, Paul K. WESTERHOFF
  • Publication number: 20200158948
    Abstract: A photoreactor including a reservoir configured to hold water, the reservoir defining an inlet and an outlet, and a multiplicity of optical fiber assemblies positioned in the reservoir. Each optical fiber assembly includes one or more optical fibers coated with a composition comprising a photoresponsive polymer and a light source optically coupled to the one or more optical fibers. The photoresponsive polymer undergoes a change from an initial state to an irradiated state when irradiated with light from the light source, and photoresponsive polymer in the irradiated state is adapted to bind an ion from the water.
    Type: Application
    Filed: November 21, 2019
    Publication date: May 21, 2020
    Inventors: Paul K. Westerhoff, Shahnawaz Sinha, Juan Noveron
  • Patent number: 10590020
    Abstract: Wastewater sludge is treated by combining the sludge with a carbon-based dielectric additive that includes carbon to yield a modified sludge, irradiating the modified sludge with microwave radiation to yield a treated sludge, and providing the treated sludge to an anaerobic digester.
    Type: Grant
    Filed: January 18, 2019
    Date of Patent: March 17, 2020
    Assignees: Arizona Board of Regents on behalf of Arizona State University, The University of Massachusetts
    Inventors: Onur Apul, Paul Dahlen, Paul K. Westerhoff
  • Publication number: 20200031689
    Abstract: Preparing a porous hybrid media includes contacting porous media (e.g., strong base ion-exchange media) with an aqueous solution including aluminum ions to yield a aluminum-ion-containing porous media, contacting the aluminum-ion containing porous media with a reducing agent to impregnate elemental aluminum in the porous media, and oxidizing the elemental aluminum to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. In some cases, a pH of an aqueous mixture including the aluminum-ion-containing porous media may be adjusted to form a floc including aluminum hydroxide, and the aluminum hydroxide-containing porous media may be contacted with a reducing agent to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. The porous hybrid media may advantageously be prepared at low temperature (e.g., room temperature).
    Type: Application
    Filed: October 7, 2019
    Publication date: January 30, 2020
    Inventors: Kiril D. Hristovski, Jasmina Markovski, Paul K. Westerhoff, Shahnawaz Sinha
  • Patent number: 10435311
    Abstract: Preparing a porous hybrid media includes contacting porous media (e.g., strong base ion-exchange media) with an aqueous solution including aluminum ions to yield a aluminum-ion-containing porous media, contacting the aluminum-ion containing porous media with a reducing agent to impregnate elemental aluminum in the porous media, and oxidizing the elemental aluminum to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. In some cases, a pH of an aqueous mixture including the aluminum-ion-containing porous media may be adjusted to form a floc including aluminum hydroxide, and the aluminum hydroxide-containing porous media may be contacted with a reducing agent to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. The porous hybrid media may advantageously be prepared at low temperature (e.g., room temperature).
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: October 8, 2019
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Kiril D. Hristovski, Jasmina Markovski, Paul K. Westerhoff, Shahnawaz Sinha
  • Patent number: 10427194
    Abstract: A soil remediation method for treating contaminated soil includes combining a dielectric carbonaceous nanomaterial with the contaminated soil to yield a composite contaminated soil, and irradiating the composite contaminated soil with microwave radiation to yield a remediated soil. The composite contaminated soil includes at least 1 wt % of the dielectric carbonaceous material, and the microwave radiation provides an energy input of at least 2.5 kWh per kilogram of the composite contaminated soil.
    Type: Grant
    Filed: September 28, 2017
    Date of Patent: October 1, 2019
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Paul K. Westerhoff, Paul Dahlen, Onur Apul
  • Publication number: 20190218128
    Abstract: Wastewater sludge is treated by combining the sludge with a carbon-based dielectric additive that includes carbon to yield a modified sludge, irradiating the modified sludge with microwave radiation to yield a treated sludge, and providing the treated sludge to an anaerobic digester.
    Type: Application
    Filed: January 18, 2019
    Publication date: July 18, 2019
    Inventors: Onur Apul, Paul Dahlen, Paul K. Westerhoff
  • Publication number: 20190094118
    Abstract: A microfluidic device includes a sample inlet for a fluid sample, a degassing chamber having a gas-permeable membrane and defining first and second portions separated by the gas permeable membrane, and a detection chamber. The sample inlet and the detection chamber are fluidly coupled to the first and second portions, respectively of the degassing chamber. The detection chamber is operably coupled to a light source and a detector. Assessing a concentration of chlorine gas in an aqueous sample includes providing an aqueous sample to a microfluidic device, separating gas from the aqueous sample in the microfluidic device, providing the gas to a detector, assessing the absorbance of the gas sample at a known absorption wavelength of chlorine, and based on the assessed absorbance of the gas sample at the known absorption wavelength of chlorine, assessing a concentration of chlorine gas in the aqueous sample.
    Type: Application
    Filed: September 28, 2018
    Publication date: March 28, 2019
    Inventors: Paul K. Westerhoff, Shahnawaz Sinha, Treavor Boyer
  • Publication number: 20190056363
    Abstract: A composition for dry reagent colorimetric sensing of nanoparticles in aqueous media, including sodium borohydride (NaBH4), methylene blue (MB), and 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES) in the form of a powdered mixture. The composition may be formed by combining MB, HEBES, and water to yield an aqueous mixture, removing water from the aqueous mixture to yield a solid mixture, and combining NaBH4 powder with the solid mixture to yield the composition. The composition may be used to detect metallic nanoparticles an aqueous solution by combining the composition with an aqueous solution to yield a test solution, and assessing a concentration of the metallic nanoparticles in the test solution based on absorbance of light by the test solution. The composition may be provided in an assay kit for sensing nanoparticles in aqueous media.
    Type: Application
    Filed: August 17, 2018
    Publication date: February 21, 2019
    Inventors: Paul K. Westerhoff, Xiangyu Bi, Shahnawaz Sinha, Jonathan D. Posner, Charlie Corredor
  • Publication number: 20180319677
    Abstract: Compositions for bromide removal include a two-dimensional material impregnated with silver. The silver may be impregnated in the two-dimensional material by contacting the two-dimensional material with silver ions in an aqueous solution, allowing the silver ions to adsorb on the two-dimensional material, and drying the two-dimensional material. Removing bromide from an aqueous composition including bromide may include contacting the aqueous composition with a two-dimensional material impregnated with silver, and allowing the bromide to react with the silver to yield silver bromide.
    Type: Application
    Filed: May 4, 2018
    Publication date: November 8, 2018
    Inventors: Francois Perreault, Paul K. Westerhoff, Onur Guven Apul, Shahnawaz Sinha
  • Publication number: 20180086648
    Abstract: Preparing a porous hybrid media includes contacting porous media (e.g., strong base ion-exchange media) with an aqueous solution including aluminum ions to yield a aluminum-ion-containing porous media, contacting the aluminum-ion containing porous media with a reducing agent to impregnate elemental aluminum in the porous media, and oxidizing the elemental aluminum to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. In some cases, a pH of an aqueous mixture including the aluminum-ion-containing porous media may be adjusted to form a floc including aluminum hydroxide, and the aluminum hydroxide-containing porous media may be contacted with a reducing agent to yield a porous hybrid media including aluminum hydr(oxide) impregnated in the porous media. The porous hybrid media may advantageously be prepared at low temperature (e.g., room temperature).
    Type: Application
    Filed: September 28, 2017
    Publication date: March 29, 2018
    Inventors: Kiril D. Hristovski, Jasmina Markovski, Paul K. Westerhoff, Shahnawaz Sinha
  • Publication number: 20180085800
    Abstract: A soil remediation method for treating contaminated soil includes combining a dielectric carbonaceous nanomaterial with the contaminated soil to yield a composite contaminated soil, and irradiating the composite contaminated soil with microwave radiation to yield a remediated soil. The composite contaminated soil includes at least 1 wt % of the dielectric carbonaceous material, and the microwave radiation provides an energy input of at least 2.5 kWh per kilogram of the composite contaminated soil.
    Type: Application
    Filed: September 28, 2017
    Publication date: March 29, 2018
    Inventors: Paul K. Westerhoff, Paul Dahlen, Onur Apul
  • Publication number: 20180080148
    Abstract: Porous nanocomposite fibers are fabricated by electrospinning a solution including a polymer, a solvent, and a nanomaterial. The resulting fibers can be used in the form of a filter to remove a variety of organic and inorganic contaminants from an aqueous environment, and provide a macroscopic matrix to facilitate separation of the nanomaterial from the aqueous environment.
    Type: Application
    Filed: September 15, 2017
    Publication date: March 22, 2018
    Inventors: Paul K. Westerhoff, Natalia Hoogesteijn von Reitzenstein, Shahnawaz Sinha, Kiril D. Hristovski
  • Patent number: 9878320
    Abstract: Hybrid media formed by combining a metal precursor solution with particulate media to yield a mixture, decanting the mixture to yield a decanted mixture, heating the decanted mixture in via microwave radiation to yield hybrid media, rinsing the hybrid media with water, soaking the rinsed hybrid media in a salt solution, and rinsing the soaked hybrid media with water. The hybrid media includes a metal dioxide derived from the metal precursor, such as TiO2 derived from TiOSO4.
    Type: Grant
    Filed: July 10, 2015
    Date of Patent: January 30, 2018
    Assignee: Arizona Board of Regents on behalf of Arizona State University
    Inventors: Kiril D. Hristovski, Paul K. Westerhoff
  • Publication number: 20170313601
    Abstract: A reactor for water splitting or water treatment includes a first electrode, a second electrode electrically coupled to the first electrode, and a proton exchange membrane separating the first electrode and the second electrode. The first electrode includes a first optical fiber coated with a photocatalytic material.
    Type: Application
    Filed: April 27, 2017
    Publication date: November 2, 2017
    Inventors: Paul K. Westerhoff, Kiril D. Hristovski, Shahnawaz Sinha