Use of MgO doped with a divalent or trivalent metal cation for removing arsenic from water
| DWPI Title: Composition of matter used for removing arsenic from drinking water and treating arsenic poisoning in human or animal, comprises particles of magnesium oxide or magnesium hydroxide having a zinc coating which is present as e.g. zinc sulfate |
| Abstract: Systems and methods for use of magnesium hydroxide, either directly or through one or more precursors, doped with a divalent or trivalent metal cation, for removing arsenic from drinking water, including water distribution systems. In one embodiment, magnesium hydroxide, Mg(OH)2 (a strong adsorbent for arsenic) doped with a divalent or trivalent metal cation is used to adsorb arsenic. The complex consisting of arsenic adsorbed on Mg(OH)2 doped with a divalent or trivalent metal cation is subsequently removed from the water by conventional means, including filtration, settling, skimming, vortexing, centrifugation, magnetic separation, or other well-known separation systems. In another embodiment, magnesium oxide, MgO, is employed, which reacts with water to form Mg(OH)2. The resulting Mg(OH)2 doped with a divalent or trivalent metal cation, then adsorbs arsenic, as set forth above. The method can also be used to treat human or animal poisoning with arsenic. |
| Use: The composition of matter is useful for: removing arsenic from drinking water, including water distribution systems, preferably municipal or rural water systems; and treating arsenic poisoning in human or animal. No biological data given. |
| Advantage: The composition of matter: utilizes magnesium hydroxide which is a strong adsorbent for arsenic; and provides very rapid sorption of arsenic without formation of magnesium carbonate overwhelming the arsenic adsorption. |
| Novelty: Composition of matter comprises particles of magnesium oxide or magnesium hydroxide having a zinc coating. The median particle size is less than 3 μ . The zinc coating is present as any one of zinc sulfate, hydrous zinc sulfate, zinc chloride, zinc nitrate and anhydrous zinc nitrate. |
| Filed: 8/12/2013 |
| Application Number: US13964424A |
| Tech ID: SD 7871.1 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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