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Method and composition for removing contaminants from an aqueous solution

A technology for pollutants and aqueous solutions, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve unsolved problems such as using iron oxyhydroxide alone

Inactive Publication Date: 2008-01-16
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the prior art discloses the use of iron oxyhydroxide as an ionic adsorption medium to remove pollutants from water, this document does not address the use of iron oxyhydroxide alone

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: Method for coating limestone particles

[0047] 400 ml of limestone particles with a particle size of 212-425 microns were added to the reactor. Add 400 mL of deionized water. 800 ml of ferric chloride solution (40% w / v) were gradually added over 20 minutes. React at room temperature for 35 minutes. Gradually add 1500 mL of NaHCO over 15 minutes 3 (8% w / w). 400 ml of 15% w / w NaOH were added over 5 minutes and the contents were stirred for 10 minutes. The pH was maintained at 3-8 60 minutes after the addition of caustic soda. Wash with 5 liters of water until the eluate is clear. The final pH was 7.2. The material was drained using a Buchner funnel and packed. Samples were dried in an oven at 110°C for 48 hours, subjected to acid digestion, and iron was measured by ICP. The percentage (%) of Fe is 19%, and the BET surface area is 38 m 2 / gram.

Embodiment 2

[0048] Example 2: Method of Coating Limestone Granules

[0049] 400 ml of limestone particles with a particle size of 500-1000 microns were added to the reactor. Add 400 mL of deionized water. 800 ml of ferric chloride solution (40% w / v) were gradually added over 20 minutes. React at room temperature for 35 minutes. Gradually add 1500 mL of NaHCO over 15 minutes 3 (8% w / w). 400 mL of NaOH (15% w / w) was added over 5 minutes and the mass was stirred for 10 minutes. The pH was maintained at 3-8 60 minutes after the addition of caustic soda. Wash with 5 liters of water until the eluate is clear. The final pH was 7.2. The material was drained using a Buchner funnel and packaged. Samples were dried at 110°C for 48 hours, subjected to acid digestion, and iron was measured by ICP. The percentage (%) of Fe is 17%, and the BET surface area is 34 m 2 / gram.

Embodiment 3

[0050] Example 3: Method of Coating Limestone Granules

[0051] 100 ml of limestone particles with a particle size of 106-425 microns were added to the reactor. Add 100 mL of deionized water. 200 ml of ferric chloride solution (40% w / w) were gradually added over 20 minutes. React at room temperature for 25 minutes. Gradually add 300 mL of NaHCO over 15 minutes 3 . Keep the pH at 5-8. The reaction was allowed to proceed until a final pH of 5-8 after 60 minutes. Excess liquid and water were drained and the material was washed with excess water until the eluate was clear. XRF result: Fe content 7%, CaCO 3 Content 83%. BET surface area = 29 meters 2 / gram.

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Abstract

A method of removing contaminants from an aqueous solution comprising contacting the aqueous solution with limestone particles coated with iron oxyhydroxide and adsorbing the contaminants from the aqueous solution onto the particle.

Description

[0001] Related Application Cross Reference [0002] This application claims priority under 35 U.S.C §119(e) to U.S. Provisional Application No. 60 / 830,592, filed July 13, 2006, the specification of which is incorporated herein by reference. technical field [0003] The present invention relates to methods and compositions for removing contaminants from aqueous solutions. Background technique [0004] Groundwater contamination, particularly arsenic ("As") contamination, is a worldwide problem. In some countries, the acceptable level of arsenic in water is 50 micrograms per liter, and in the United States, the drinking water standard is a maximum of 10 micrograms per liter. [0005] Due to the problem of contaminants in water and other aqueous solutions, a number of methods have been developed to remove contaminants from these solutions. Common techniques include chemical coagulation / precipitation, membrane separation, and adsorption. An example of an adsorption process can...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/04B01J20/20
Inventor R·M·巴那瓦里J·A·特雷霍
Owner ROHM & HAAS CO
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