Title: Zirconium-modified materials for selective adsorption and removal of aqueous arsenic

Abstract

A method, composition, and apparatus for removing contaminant species from an aqueous medium comprising: providing a material to which zirconium has been added, the material selected from one or more of zeolites, cation-exchangeable clay minerals, fly ash, mesostructured materials, activated carbons, cellulose acetate, and like porous and/or fibrous materials; and contacting the aqueous medium with the material to which zirconium has been added. The invention operates on all arsenic species in the form of arsenate, arsenite and organometallic arsenic, with no pretreatment necessary (e.g., oxidative conversion of arsenite to arsenate).

Inventors:

Zhao, Hongting; Moore, Robert C.

Issue Date:

2004-11-30

Research Org.:

Sandia National Lab. (SNL-CA), Livermore, CA (United States)

Sponsoring Org.:

USDOE

OSTI Identifier:

1175155

Patent Number(s):

6824690

Application Number:

10/269,596

Assignee:

Sandia Corporation

Patent Classifications (CPCs):

B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

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B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY

B01J20/02 - comprising inorganic material
B01J20/06 - comprising oxides or hydroxides of metals not provided for in group B01J20/04
B01J20/12 - Naturally occurring clays or bleaching earth
B01J20/186 - {Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity}
B01J20/20 - comprising free carbon
B01J20/262 - {obtained otherwise than by reactions only involving carbon to carbon unsaturated bonds, e.g. obtained by polycondensation
B01J20/28016 - {Particle form}
B01J20/2805 - {Sorbents inside a permeable or porous casing, e.g. inside a container, bag or membrane}
B01J20/3078 - {Thermal treatment, e.g. calcining or pyrolizing}
B01J20/3204 - {Inorganic carriers, supports or substrates}
B01J20/3212 - {consisting of a polymer obtained by reactions otherwise than involving only carbon to carbon unsaturated bonds}
B01J20/3236 - {containing metal, other than zeolites, e.g. oxides, hydroxides, sulphides or salts}
B01J2220/58 - Use in a single column

C - CHEMISTRY C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE C02F - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

C02F1/281 - {using inorganic sorbents}
C02F1/288 - {using composite sorbents, e.g. coated, impregnated, multi-layered}
C02F2101/103 - {Arsenic compounds}

Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC Y10T - TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

Y10T428/2991 - Coated

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DOE Contract Number:  

AC04-94AL85000

Resource Type:

Patent

Country of Publication:

United States

Language:

English

Subject:

42 ENGINEERING