Arsenic adsorbing 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 filtering composition comprising lanthanum and iron hydroxide, the filtering composition having a surface area of at least about 175 m 2 /g, having a bulk density of between about 0.5 g/cc and about 1.2 g/cc, and having a zeta point of at least about pH 9.0.
2. The filtering composition of claim 1 , further comprising magnesium.
3. The filtering composition of claim 1 , wherein the filtering composition has a surface area of at least about 200 m 2 /g.
4. The filtering composition of claim 1 , wherein the filtering composition has a surface area of at least about 185 m 2 /g.
5. The filtering composition of claim 1 , wherein the filtering composition has a moisture content between about 10 wt % and about 40 wt %.
6. The filtering composition of claim 1 , wherein the filtering composition has a bulk density of between about 0.6 g/cc and about 1.0 g/cc.
7. The filtering composition of claim 1 , further comprising a diatomaceous earth support.
8. A method of forming the filtering composition of claim 1 , comprising adding a solution comprising lanthanum and iron to a basic solution.
9. A method of forming the filtering composition of claim 1 , the method 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 %.
10. The method of claim 9 , further comprising ultrasonicating the filtering composition before drying the filtering composition.
11. The method of claim 10 , wherein the filtering composition is ultrasonicated for between about 10 minutes and about 60 minutes.
12. 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.
13. The filtering composition of claim 12 , 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.
14. A free flowing filtering composition comprising lanthanum and iron hydroxide, the filtering composition having a surface area of at least about 175 m 2 /g, having a moisture content between about 10 wt % and about 30 wt %, having a zeta point of at least about pH 9.0, and having a bulk density of between about 0.6 g/cc and about 1.0 g/cc.
15. The filtering composition of claim 14 , further comprising magnesium.
16. The filtering composition of claim 14 , wherein the filtering composition has a surface area of at least about 200 m 2 /g.
17. The filtering composition of claim 14 , wherein the filtering composition has a surface area of at least about 185 m 2 /g.
18. The filtering composition of claim 14 , further comprising a diatomaceous earth support.
19. A free flowing filtering composition comprising lanthanum and iron hydroxide, the filtering composition having a surface area of at least about 175 m 2 /g, having a zeta point of between about pH 9.0 and about pH 10.0, and having a bulk density of between about 0.6 g/cc and about 1.0 g/cc, the filtering composition having been manufactured by a process comprising:
dissolving lanthanum nitrate and iron nitrate in a solution;
heating the solution;
stirring the solution and adding sodium hydroxide to adjust pH of the solution;
subjecting the solution to ultrasonic conditioning; and
drying the solution at a temperature less than about 200° C. to yield precipitated lanthanum hydroxide and iron hydroxide.
20. The filtering composition of claim 19 , wherein the filtering composition has a surface area of at least about 200 m 2 /g.
21. The filtering composition of claim 1 , wherein the filtering composition has a zeta point of between about pH 9.0 and about pH 10.0.
22. The filtering composition of claim 1 , wherein the filtering composition has a zeta point of between about pH 9.5 and about pH 9.8.
23. The filtering composition of claim 1 , further comprising a support, wherein the support is diatomaceous earth, perlite or cellulose.
24. The filtering composition of claim 14 , wherein the filtering composition has a zeta point of between about pH 9.0 and about pH 10.0.
25. The filtering composition of claim 14 , wherein the filtering composition has a zeta point of between about pH 9.5 and about pH 9.8.
26. The filtering composition of claim 14 , further comprising a support, wherein the support is diatomaceous earth, perlite or cellulose.
27. The filtering composition of claim 1 , wherein the composition has a particle size of 20x200 mesh.
28. The filtering composition of claim 1 , wherein the composition has a particle size of 100x325 mesh.
29. The method of claim 13 , wherein the solution is heated to a temperature of between 35° C. and 45° C.
30. The method of claim 13 , wherein the solution is heated to a temperature of up to about 60° C.
31. The filtering composition of claim 14 , wherein the composition has a particle size of 20x200 mesh.
32. The filtering composition of claim 14 , wherein the composition has a particle size of 100x325 mesh.
33. The filtering composition of claim 19 , wherein the composition has a particle size of 20x200 mesh.
34. The filtering composition of claim 19 , wherein the composition has a particle size of 100x325 mesh.
35. The filtering composition of claim 19 , wherein the solution is heated to a temperature of between 35° C. and 45° C.
36. The filtering composition of claim 19 , wherein the solution is heated to a temperature of up to about 60° C.