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Nano-Composite Arsenic Sorbent

N-CAS: A low cost, highly effective arsenic removal technology

Idaho National Laboratory

Contact INL About This Technology

Technology Marketing Summary
INL nanotechnology researchers have engineered a revolutionary and affordable material called Nano-Composite Arsenic Sorbent, or
N-CAS, that is up to seven times more effective than other currently available materials.  This technology has potential to aid millions of Americans, but also more than 70 million people around the globe, who are exposed to dangerous arsenic concentrations in their drinking water.
Description
N-CAS contains high concentrations of arsenic adsorbing nano-particle metal oxides embedded in a strong composite polymer matrix. It excels in offering significant reaction kinetics, exceptional strength and an extreme surface area. In fact, one gram of N-CAS contains 40% more adsorbent surface area than the square footage of the average American home. It is estimated that one gallon of N-CAS can treat 350,000 - 400,000 gallons of water compared to 50,000 for the next best material today.  It is also estimated that N-CAS is more affordable; costing approximately ten cents per thousand gallons of water treated, about 1/5th of other methods. N-CAS also is compatible with packed-bed treatment systems and durable enough to withstand repeated recharging without appreciable loss of capacity (reducing
operational costs).
 
N-CAS is:
• Composite material made of approximately 15% polymer by mass with remainder made up of Fe(III) hydrous oxide compounds (85% by
mass)
 
N-CAS has:
• Surface area – 275-350 m2/g (Comparable with carbon nanotube materials)
 
Compared to other arsenic removal treatments, N-CAS offers a nano-composite material characterized by –
• An extremely expanded surface area producing a high adsorbing capacity and exceptional arsenic bonding ability.
• High efficiency in removing arsenic rapidly, using high-flow systems and even in water with relatively low arsenic concentrations.
• Unparalleled strength that permits successive regeneration and an exceptional long life-cycle, which reduces operating costs by a factor of 4 or 5.
• Passes EPA’s Toxic Characteristic Leaching Procedure (TCLP) to determine the toxicity of waste, which means the spent N-CAS is environmentally friendly and easily disposed.

 

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Date
Patent 7,368,412
Patent
7,368,412
High capacity adsorption media and method of producing
A method of producing an adsorption medium to remove at least one constituent from a feed stream. The method comprises dissolving at least one metal compound in a solvent to form a metal solution, dissolving polyacrylonitrile into the metal solution to form a PAN-metal solution, and depositing the PAN-metal solution into a quenching bath to produce the adsorption medium. The at least one constituent, such as arsenic, selenium, or antimony, is removed from the feed stream by passing the feed stream through the adsorption medium. An adsorption medium having an increased metal loading and increased capacity for arresting the at least one constituent to be removed is also disclosed. The adsorption medium includes a polyacrylonitrile matrix and at least one metal hydroxide incorporated into the polyacrylonitrile matrix.
Idaho National Laboratory 05/06/2008
Issued
Patent 7,807,606
Patent
7,807,606
High capacity adsorption media and method of producing
A method of producing an adsorption medium to remove at least one constituent from a feed stream. The method comprises dissolving and/or suspending at least one metal compound in a solvent to form a metal solution, dissolving polyacrylonitrile into the metal solution to form a PAN-metal solution, and depositing the PAN-metal solution into a quenching bath to produce the adsorption medium. The at least one constituent, such as arsenic, selenium, or antimony, is removed from the feed stream by passing the feed stream through the adsorption medium. An adsorption medium having an increased metal loading and increased capacity for arresting the at least one constituent to be removed is also disclosed. The adsorption medium includes a polyacrylonitrile matrix and at least one metal hydroxide incorporated into the polyacrylonitrile matrix.
Idaho National Laboratory 10/05/2010
Issued
Patent 8,043,586
Patent
8,043,586
Methods of using adsorption media for separating or removing constituents
Methods of using an adsorption medium to remove at least one constituent from a feed stream. The method comprises contacting an adsorption medium with a feed stream comprising at least one constituent and removing the at least one constituent from the feed stream. The adsorption medium comprises a polyacrylonitrile (PAN) matrix and at least one metal hydroxide homogenously dispersed therein. The adsorption medium may comprise from approximately 15 wt % to approximately 90 wt % of the PAN and from approximately 10 wt % to approximately 85 wt % of the at least one metal hydroxide. The at least one metal hydroxide may be selected from the group consisting of ferric hydroxide, zirconium hydroxide, lanthanum hydroxide, cerium hydroxide, titanium hydroxide, copper hydroxide, antimony hydroxide, and molybdenum hydroxide.
Idaho National Laboratory 10/25/2011
Issued
Patent 8,664,150
Patent
8,664,150
Methods of producing adsorption media including a metal oxide
Methods of producing a metal oxide are disclosed. The method comprises dissolving a metal salt in a reaction solvent to form a metal salt/reaction solvent solution. The metal salt is converted to a metal oxide and a caustic solution is added to the metal oxide/reaction solvent solution to adjust the pH of the metal oxide/reaction solvent solution to less than approximately 7.0. The metal oxide is precipitated and recovered. A method of producing adsorption media including the metal oxide is also disclosed, as is a precursor of an active component including particles of a metal oxide.
Idaho National Laboratory 03/04/2014
Issued
Patent 7,947,861
Patent
7,947,861
Methods of removing a constituent from a feed stream using adsorption media
A method of producing an adsorption medium to remove at least one constituent from a feed stream. The method comprises dissolving and/or suspending at least one metal compound in a solvent to form a metal solution, dissolving polyacrylonitrile into the metal solution to form a PAN-metal solution, and depositing the PAN-metal solution into a quenching bath to produce the adsorption medium. The at least one constituent, such as arsenic, selenium, or antimony, is removed from the feed stream by passing the feed stream through the adsorption medium. An adsorption medium having an increased metal loading and increased capacity for arresting the at least one constituent to be removed is also disclosed. The adsorption medium includes a polyacrylonitrile matrix and at least one metal hydroxide incorporated into the polyacrylonitrile matrix.
Idaho National Laboratory 05/24/2011
Issued
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
B-032, B-379, B-379D1, BA-378PrototypeAvailable05/22/201404/27/2015

Contact INL About This Technology

To: Ryan Bills, Commercialization Manager<ryan.bills@inl.gov>