Contaminate sequestering coatings and methods of using the same
Contaminate-sequestering coatings including a network of hydrolyzed silane compounds including a plurality of thiol functional groups, a plurality of fluorinated functionalities, or both are provided. The contaminate-sequestering coatings may sequester one or more per- and polyfluoroalkyl substances (PFAS), heavy metals, biological species or any combination thereof. Methods of functionalizing a substrate surface with contaminate-sequestering functionalities that sequester one or more PFAS, heavy metals, or both are also provided. Methods of removing contaminants from contaminate-containing liquids, and devices including the contaminate-sequestering coatings are also provided.
1. A contaminate-sequestering coating, comprising a network of hydrolyzed silane compounds including a plurality of thiol functional groups, a plurality of fluorinated functionalities, or both; wherein at least one of the hydrolyzed silane compounds includes a polar group comprising one or more ethylene glycol (EG) units.
2. The contaminate sequestering coating of claim 1 , wherein the network of hydrolyzed silane compounds includes a fluorinated silane comprising a linear C 1 -C 40 perfluorosilane.
3. The contaminate sequestering coating of claim 1 , wherein the network of hydrolyzed silane compounds includes a fluorinated silane comprising a cyclic hydrocarbon including from 3 to 60 carbon atoms.
4. The contaminate sequestering coating of claim 1 , wherein the network of hydrolyzed silane compounds includes a fluorinated silane including from 4 to about 200 fluorine atoms.
5. The contaminate sequestering coating of claim 1 , wherein the network of hydrolyzed silane compounds includes a fluorinated silane comprising a substituted hydrocarbon including at least one heteroatom selected from oxygen, nitrogen, sulfur, phosphorus, or combinations thereof.
6. The contaminate sequestering coating of claim 1 , wherein the network of hydrolyzed silane compounds includes a first group of fluorinated silane compounds and a second group of fluorinated compounds, and
wherein the first group of fluorinated silane compounds includes from about 1.5 to about 5 times more fluorine atoms than the second group of fluorinated compounds.
7. The contaminate sequestering coating of claim 1 , wherein the contaminate sequestering coating sequesters:
(i) one or more polyfluoroalkyl (PFAS) compounds initially present in a liquid contaminated with an initial quantity of the PFAS compounds, wherein an amount of the one or more PFAS compounds sequestered comprises from about 50% to about 100% by weight of the initial quantity of the PFAS compounds;
(ii) one or more heavy metals initially present in a liquid contaminated with an initial quantity of the heavy metals, wherein an amount of the one or more heavy metals sequestered comprises from about 50% to about 100% by weight of the initial quantity of the heavy metals; or
(iii) both (i) and (ii).