Electrophoretic deposition of adsorbent media
A method of electrophoretic deposition of adsorbent media onto an electrically conducting substrate. The adsorbent media may include one or more porous coordination polymers and/or one or more secondary adsorbing particles. The adsorbent media may be continuously applied from a liquid composition at a selected thickness and at a controlled rate and as a function of voltage profiles.
1. A method of forming an adsorbent media coating comprising:
drawing an electrically conductive substrate through a bath including a polar solvent and a metal salt present in said polar solvent;
applying an electrical potential and depositing adsorbent material onto said conductive substrate, wherein said adsorbent material comprises one or a plurality of porous coordination polymers and one or a plurality of secondary adsorbing particles wherein said one or plurality of porous coordination polymers is present in said polar solvent at a concentration in the range of 0.1 g/L to 10 g/L and said one or plurality of secondary adsorbing particles are present in said polar solvent at a concentration in the range of 0.1 g/L to 10 g/L and said adsorbent material forms a coating having a thickness of 1.0 micron to 100 microns and said porous coordination polymers have a porosity of 1.0 μm to 100 μm.
2. The method of claim 1 wherein the porous coordination polymer comprises one of a metal organic framework or covalent organic framework.
3. The method of claim 2 wherein said metal organic framework comprises metal ions coordinated to an organic molecule to form one, two and/or three-dimensional structures.
4. The method of claim 2 wherein said covalent organic framework comprises a crystalline and porous organic molecule sourced from the elements carbon, nitrogen, oxygen, boron and hydrogen.
5. The method of claim 1 wherein said porous coordination polymer comprises zeolitic imidazolate frameworks.
6. The method of claim 1 wherein the secondary adsorbing particles comprise carbon particles, alumina particles, aluminosilicate polymer particles, silica particles, and/or clay particles.
7. The method of claim 1 wherein the secondary adsorbing particles comprise aluminosilicate polymer particles at a size range of 1.0 to 5.0 mm.
8. The method of claim 1 wherein the secondary adsorbing particles comprise silica particles having an average size of 10 nm to 10,000 nm.
9. The method of claim 1 wherein said porous coordination polymer is present at a level of 1.0% to 99% by weight and said secondary adsorbing particles are present at a level of 99% by weight to 1.0% by weight.
10. The method of claim 1 wherein an electrode is positioned in said deposition bath, and said conductive substrate comprises a deposition electrode and a constant voltage is applied between said electrodes of −10 V to −80V.
11. The method of claim 1 wherein an electrode is positioned in said deposition bath and said conductive substrate comprises a deposition electrode, and a pulsed voltage is applied between said electrodes of −65 V to −500 V.
12. The method of claim 1 wherein said porous coordination polymers comprise a plurality of porous coordination polymers having different chemical structures.
13. The method of claim 1 wherein said secondary adsorbing particles comprises a plurality of particles of different chemical composition.