Functionalization of Cotton Fiber by Partial Etherification and Self-Assembly of Polyoxometalate Encapsulated in Cu3(BTC)2 Metal-Organic Framework

A combination of a Keggin-type polyoxometalate (POM)) [CuPW11O39](5-), With a Cu-3(BTC)(2) metal-organic framework (MOF-199/HKUST-1; where BTC is benzene-1,3,5-tricarboxylate), was successfully Self-assembled on a Cellulose substrate, (cotton) with a room-temperature process. Cotton fibers were functionalized by partial etherificatiom Cu-3(BTC)(2) metal-organic framework and polyoxometalate encapsulated in Cu-3(BTC)(2) metal-organic framework were self-assembled on the carboxymethylate ion sites initiated With copper nitrate using ethanol and water as solvents. Octahedral crystals were observed on both MOF-cotton and POM-MOF-cotton; both contained copper while the POM-MOF-cotton also contained tungsten. Occupancy of POM MOF cages was calculated to be about 13%. Moisture content remained at 3 to 4 wt % similar to that of untreated cotton. Reactivity to both hydrogen sulfide and methyl parathion Was higher for POM-MOF-cotton due to the Keggin polyoxometalate and the extra framework cations Cu2+ ions compensating the charges of the encapsulated Keggins The POM-MOF Material was found to effectively remove 0.089 mg of methyl parathion per mg of MOF from a hexane solution while MOF-cotton removed only 0.054 mg of methyl parathion per mg of MOF.