Silica particles coated with beta-cyclodextrin for the removal of emerging contaminants from wastewater
AssigneeTemple University of the Commonwealth System of Higher Education
InventorsRominder P. S. Suri, Bikash Bhattarai
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Abstract
Provided is a silica particle coated with β-cyclodextrin, wherein said cyclodextrin is attached to said silica particle via at least one crosslinking agent and/or at least one copolymer. Also provided are methods of removing contaminants from a flowing or stationary liquid phase comprising the step of contacting said liquid phase with the silica particle coated with β-cyclodextrin.
Claims23
A silica particle coated with β-cyclodextrin polymer, wherein said β-cyclodextrin polymer is formed by polymerizing β-cyclodextrin with
- (i) hexamethylene diisocyanate, wherein the molar ratio of β-cyclodextrin:
- hexamethylene diisocyanate in said polymerization is from about 1:7 to about 1:15 and wherein the molar ratio of β-cyclodextrin:silica in said polymerization is from about 1:15 to about 1:30;
- or
- (ii) epichlorohydrin, wherein the molar ratio of β-cyclodextrin:
- epichlorohydrin in said polymerization is from about 1:7 to about 1:9 and wherein the molar ratio of β-cyclodextrin:silica in said polymerization is from about 1:83 to about 1:125.
A silica particle modified with a functional group on its surface and coated with β-cyclodextrin, wherein said β-cyclodextrin is attached to said silica particle via a chemical bond to the functional group on the surface of the silica.
A silica particle modified with a functional group on its surface and coated with β-cyclodextrin polymer, wherein said β-cyclodextrin polymer is formed by polymerizing β-cyclodextrin with hexamethylene diisocyanate or epichlorohydrin and wherein said β-cyclodextrin polymer is attached to said silica particle via a chemical bond to the functional group on the surface of the silica.
A process for producing a silica particle coated with β-cyclodextrin comprising:
- coating silica particles with β-cyclodextrin;
- and
- polymerizing said β-cyclodextrin with hexamethylene diisocyanate to form hexamethylene diisocyanate-crosslinked β-cyclodextrin polymer;
- wherein the molar ratio of β-cyclodextrin:
- hexamethylene diisocyanate in said polymerization is from about 1:7 to about 1:15 and wherein the molar ratio of β-cyclodextrin:
- silica in said polymerization is from about 1:15 to about 1:30.
A process for producing a silica particle coated with β-cyclodextrin comprising:
- coating silica particles with β-cyclodextrin;
- and
- polymerizing said β-cyclodextrin with epichlorohydrin to form epichlorohydrin-crosslinked β-cyclodextrin polymer;
- wherein the molar ratio of β-cyclodextrin:
- epichlorohydrin in said polymerization is from about 1:7 to about 1:9 and wherein the molar ratio of β-cyclodextrin:silica in said polymerization is from about 1:83 to about 1:125.
A process for producing a silica particle modified with a functional group on its surface and coated with β-cyclodextrin, wherein said β-cyclodextrin is attached to said silica particle via a chemical bond to the functional group on the surface of the silica, comprising:
- reacting a silica particle with a compound selected from the group consisting of glycidoxypropyl trimethoxysilane and aminopropyl triethoxysilane to form a functionalized silica particle;
- and
- reacting β-cyclodextrin with said functionalized silica particle to form a functionalized silica particle coated with β-cyclodextrin.
A process for producing a silica particle modified with a functional group on its surface and coated with β-cyclodextrin, wherein said β-cyclodextrin is attached to said silica particle via a chemical bond to the functional group on the surface of the silica, comprising:
- reacting β-cyclodextrin with a compound selected from the group consisting of glycidoxypropyl trimethoxysilane and aminopropyl triethoxysilane to form a functionalized β-cyclodextrin;
- and
- reacting a silica particle with said functionalized β-cyclodextrin to form a functionalized silica particle coated with β-cyclodextrin.
A process for producing a silica particle modified with a functional group on its surface and coated with β-cyclodextrin, wherein said β-cyclodextrin is polymerized via hexamethylene diisocyanate or epichlorohydrin and wherein said polymerized β-cyclodextrin is attached to said silica particle via a chemical bond to the functional group on the surface of the silica, comprising:
- reacting β-cyclodextrin and hexamethylene diisocyanate or epichlorohydrin to form a β-cyclodextrin polymer;
- separately reacting the silica particle with a compound selected from the group consisting of glycidoxypropyl trimethoxysilane and aminopropyl triethoxysilane to make a functionalized silica particle;
- and
- coating said functionalized silica particle with said β-cyclodextrin polymer.
Dependencies are inferred from the claim text.