Arsenic absorbing composition and methods of use
View Patent ↗In various embodiments, the present disclosure provides filtering compositions, their method of production, and methods for their use. In specific implementations, the filtering composition includes lanthanum and has a surface area of at least about 125 g/m 2 . In more specific examples, the filtering composition is free-flowing or has a moisture content between about 10 wt % about 30 wt %. Particular compositions include at least one of iron or magnesium. Some embodiments of the present disclosure provide filtering compositions that are resilient or leach-resistant.
1. A free-flowing granular filtering composition comprising lanthanum, iron, and a diatomaceous earth support, the filtering composition having surface area of at least about 175 m 2 /g, which removes solutes from aqueous solutions by adsorption.
2. The filtering composition of claim 1 , wherein the solutes comprise anions.
3. The filtering composition of claim 1 , further comprising magnesium.
4. The filtering composition of claim 1 , wherein the filtering composition has a surface area of at least about 200 m 2 /g.
5. The filtering composition of claim 1 , wherein the filtering composition has a moisture content between about 10 wt % and about 30 wt %.
6. The filtering composition of claim 1 , wherein the filtering composition has a density of between about 0.6 g/cc and about 1.0 g/cc.
7. A method of forming the filtering composition of claim 1 , comprising adding a solution comprising lanthanum and iron to a basic solution.
8. The method of claim 7 , wherein the basic solution comprises a diatomaceous support.
9. A free flowing filtering composition comprising lanthanum, iron and a diatomaceous earth support, the filtering composition having a surface area of at least about 175 m 2 /g.
10. The filtering composition of claim 9 , wherein the filtering composition has a moisture content between about 10 wt % and about 30 wt %.
11. The filtering composition of claim 9 , further comprising magnesium.
12. A method of forming a filtering the composition of claim 9 comprising:
precipitating an active agent comprising lanthanum and iron from a solution to produce the filtering composition; and
drying the filtering composition at temperature less than about 200° C. until the filtering composition has moisture content between about 10 wt % and about 30 wt %.
13. The method of claim 12 , further comprising ultrasonicating the filtering composition before drying the filtering composition.
14. The method of claim 13 , wherein the filtering composition is ultrasonicated for between about 10 minutes and about 60 minutes.
15. The method of claim 12 , the filtering composition further comprising magnesium.
16. The filtering composition of claim 1 , the filtering composition having been manufactured by a process comprising:
dissolving lanthanum nitrate and iron nitrate in a solution; and
drying the solution at a temperature less than about 200° C. to yield precipitated lanthanum hydroxide and iron hydroxide.
17. The filtering composition of claim 16 , wherein the process further comprises:
after dissolving, heating the solution;
stirring the solution and adding sodium hydroxide to adjust PH of the solution; and
subjecting the solution to ultrasonic conditioning.
18. The filtering composition of claim 9 , the filtering composition having been manufactured by a process comprising:
dissolving lanthanum nitrate and iron nitrate in a solution; and
drying the solution at a temperature less than about 200° C. to yield precipitated lanthanum hydroxide and iron hydroxide.
19. The filtering composition of claim 18 , wherein the process further comprises:
after dissolving, heating the solution;
stirring the solution and adding sodium hydroxide to adjust PH of the solution; and
subjecting the solution to ultrasonic conditioning.