Abstract
This study prepares Mo-doped, particulate La-BTC metal-organic frameworks (Mo/La-BTC MOFs) using polyoxometalate over a broad Mo atomic fraction (fMo) from 0 to 0.9, and examines their selective adsorption against methylene-blue (MB) dyes in water. An increased Mo concentration up to 0.61 at% results in the Mo/La-BTC MOFs when fMo was increased to 0.9. Raman spectroscopy reveals an enhanced MoO bond intensity. The Mo/La-BTC MOFs show a linearly dependent MB adsorption uptake with the increasing fMo; to which, the MOF particles remove up to 75% of MB in water within only 1 min when using an initial MB concentration of 5 × 10−6 M. This is in significant contrast with virtually zero removal against methyl-orange dyes. Our results indicate that the selective dye-removal capability depends solely on the [PMo12O40]3- complex as active sites on the La-BTC scaffold, and the MB adsorption remains effective over a broad pH range (3–10).
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