Absorbent and/or adsorptive filter media
Filter media suitable for various applications and related components, systems, and methods associated therewith are described. The filter media may include a composite structure having a mixture comprising fibrillated fibers (e.g., lyocell) and functional particles. The filter media may exhibit favorable absorption and/or adsorption characteristics.
1. A filter media comprising fibrillated fibers and functional particles, wherein the fibrillated fibers have a Canadian Standard Freeness level of fibrillation of between about 110 mL and about 800 mL and the functional particles comprise greater than about 25% by weight of the filter media, wherein the functional particles have an average surface area of greater than about 900 m 2 /g.
2. The filter media of claim 1 , wherein the fibrillated fibers have a Canadian Standard Freeness level of fibrillation of between about 110 and about 650.
3. The filter media of claim 1 , wherein the fibrillated fibers have a Canadian Standard Freeness level of fibrillation of between about 150 and about 350.
4. The filter media of claim 1 , wherein the fibrillated fibers comprise between about 4% and about 50% of the filter media.
5. The filter media of claim 4 , wherein the fibrillated fibers comprise between about 5% and about 20% of the filter media.
6. The filter media of claim 1 , wherein the fibrillated fibers comprise regenerated cellulose fibers.
7. The filter media of claim 1 , wherein the functional particles have an average surface area of greater than about 1200 m 2 /g.
8. The filter media of claim 1 , wherein the functional particles comprise between about 50% and about 95% by weight of the filter media.
9. The filter media of claim 1 , wherein the functional particles comprise between about 70% and about 95% by weight of the filter media.
10. The filter media of claim 1 , wherein the functional particles comprise activated carbon.
11. The filter media of claim 1 , further comprising a binder material comprising between about 3% and about 15% by weight of the filter media.
12. The filter media of claim 1 , further comprising non-fibrillated fibers, wherein the non-fibrillated fibers comprise less than about 10% by weight of the filter media.
13. The filter media of claim 1 , further comprising a scrim.
14. The filter media of claim 1 , wherein the filter media exhibits a moisture absorption of greater than about 20% by weight after 3 hours of exposure to a moist environment.
15. The filter media of claim 14 , wherein the filter media exhibits a moisture absorption of between about 20% and about 50% by weight after 3 hours of exposure to the moist environment.
16. The filter media of claim 1 , wherein the filter media exhibits a moisture absorption of greater than about 50% by weight after 24 hours of exposure to a moist environment.
17. The filter media of claim 16 , wherein the filter media exhibits a moisture absorption of between about 50% and about 150% by weight after 24 hours of exposure to the moist environment.
18. The filter media of claim 1 , wherein the filter media exhibits a TMP adsorption of greater than about 30% by weight after 3 hours of exposure to a TMP environment.
19. The filter media of claim 18 , wherein the filter media exhibits a TMP adsorption of between about 30% and about 110% after 3 hours of exposure to the TMP environment.
20. The filter media of claim 1 , wherein the filter media has an air permeability of between about 1.5 cfm/sf and about 30 cfm/sf.
21. The filter media of claim 1 , wherein the filter media has an average surface area of between about 900 m 2 /g and about 2500 m 2 /g.
22. A filter element comprising the filter media of claim 1 .
23. A filter media comprising fibrillated fibers and functional particles, wherein the functional particles comprise greater than about 25% by weight of the filter media and have an average surface area of greater than about 900 m 2 /g, wherein the filter media exhibits a moisture absorption of greater than about 20% by weight after 3 hours of exposure to a moist environment.
24. The filter media of claim 23 , wherein the filter media exhibits a moisture absorption of between about 20% and about 50% by weight after 3 hours of exposure to the moist environment.
25. The filter media of claim 23 , wherein the filter media exhibits a TMP adsorption of greater than about 30% by weight after 3 hours of exposure to a TMP environment.
26. The filter media of claim 25 , wherein the filter media exhibits a TMP adsorption of between about 30% and about 110% after 3 hours of exposure to the TMP environment.
27. The filter media of claim 23 , wherein the fibrillated fibers have a Canadian Standard Freeness level of fibrillation of between about 110 mL and about 650 mL.
28. The filter media of claim 23 , wherein the functional particles have an average surface area of greater than about 1200 m 2 /g.
29. The filter media of claim 23 , further comprising a scrim.
30. The filter media of claim 23 , wherein the filter media has an air permeability of between about 1.5 cfm/sf and about 30 cfm/sf.
31. The filter media of claim 23 , wherein the filter media has an average surface area of between about 900 m 2 /g and about 2500 m 2 /g.
32. The filter media of claim 1 , wherein the filter media further comprises synthetic fibers.