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Filter Media Containing Carbon Oxygen Chalcogenides
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A filter medium, chalcogenide technology, applied in the direction of alkali metal oxides/hydroxides, nitrogen compounds, non-metal elements, etc., can solve the problems of not being particularly effective, and the removal performance is not fully understood.
Active Publication Date: 2017-01-18
3M INNOVATIVE PROPERTIES CO
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While parameters such as contact time and average particle size are known to affect chloramine removal efficiency, removal performance is not well understood nor is it particularly effective
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[0099] Advantages and embodiments of this invention are further illustrated by the following examples, but the particular materials and amounts thereof recited in these examples, as well as other conditions and details, should not be construed to unduly limit this invention. In these examples, all percentages, ratios and ratios are by weight unless otherwise indicated.
[0100] All materials are commercially available, for example, from Sigma-Aldrich Chemical Company; Milwaukee, WI, or are known to those of skill in the art unless otherwise stated or apparent.
[0101] These abbreviations are used in the following examples: cc = cubic centimeter, g = gram, hr = hour, in = inch, kg = kilogram, min = minute, mol = mole; M = mole, cm = centimeter, mg / L = milligram per Liters; mm = millimeters, ml = milliliters, L = liters, N = normal, psi = pressure per square inch, MPa = megapascals and wt = weight.
[0102] method
[0103] Apparent Density Determination
[0104] Determin...
example 5
[0137] The Tmax of the material of Example 5 occurs at 211°C and 329°C; while that of the material of Example 7 occurs at 221°C and 351°C. Each of these two samples was heated at 170°C and 315°C and the released volatiles were detected by mass spectrometry. Only sulfur dioxide was detected.
example 1-24 and comparative example A-D
[0139] Examples 1-24 were prepared according to the general procedure described above for the preparation of carbon oxychalcogenides. Comparative Examples A-D are carbon substrates A-D obtained or prepared as described above. Table 1 below summarizes the materials (eg, carbon substrates and chalcogen compounds, and their related compositions) and methods and conditions used to prepare the samples for each of Comparative Examples A-D and Examples 1-24. Note deviations from general conditions.
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Abstract
Described herein is a filter media comprising a carbon substrate having a COxEy surface, wherein E is selected from at least one of S, Se, and Te; and wherein x is no greater than 0.1, and y is from 0.005 to 0.3; comprising said filter media A filtration device; and a method for removing chloramines from an aqueous solution.
Description
technical field [0001] The present invention describes a composition having a surface comprising a carbon oxychalcogenide for use as a filter medium, and methods of making and using it. Background technique [0002] Chloramines are often used in low concentrations as secondary disinfectants in municipal water distribution systems as an alternative to chlorination of free chlorine. Concern about the taste and odor of chloramine-treated water has led to an increased demand for water filters with chloramine removal capabilities. [0003] Carbon particles, such as activated carbon granules, have been used to remove chloramines from water streams. Improved chloramine removal can be achieved by reducing the average particle size of the carbon and by increasing the carbon bed contact time. While parameters such as contact time and average particle size are known to affect chloramine removal efficiency, removal performance is not well understood nor is it particularly effective. ...
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