https://commons.ufh.ac.za/vital/access/manager/Index ${session.getAttribute("locale")} 5 Catalytic oxidation of thioanisole using oxovanadium (IV)‐functionalized electrospun polybenzimidazole nanofibers https://commons.ufh.ac.za/vital/access/manager/Repository/vital:51000 Wed 05 Apr 2023 08:51:07 SAST ]]> Oxovanadium (IV)-containing poly (styrene-co-4′-ethenyl-2-hydroxyphenylimidazole) electrospun nanofibers for the catalytic oxidation of thioanisole https://commons.ufh.ac.za/vital/access/manager/Repository/vital:50959 Wed 05 Apr 2023 08:51:04 SAST ]]> Adsorption and separation of platinum and palladium by polyamine functionalized polystyrene-based beads and nanofibers https://commons.ufh.ac.za/vital/access/manager/Repository/vital:50961 0.99. The highest loading capacity of Pt and Pd were 7.4 mg/g and 4.3 mg/g respectively for the nanofiber sorbent material based on ethylenediamine (EDA) while the beads with ethylenediamine (EDA) gave 1.0 mg/g and 0.2 mg/g for Pt and Pd respectively. Metals loaded on the sorbent materials were recovered by using 3% m/v thiourea solution as the eluting agent with quantitative desorption efficiency under the selected experimental conditions. Separation of platinum from palladium was partially achieved by selective stripping of PtCl62- with 0.5 M of NaClO4 in 1.0 M HCl while PdCl42- was eluted with 0.5 M thiourea in 1.0 M HCl. Separation of platinum from iridium and rhodium under 1 M HCl concentration was successful on triethylenetriamine (TETA)-functionalized Merrifield beads. This material (M-TETA) showed selectivity for platinum albeit the low loading capacity.]]> Wed 05 Apr 2023 08:50:56 SAST ]]> Imidazole-functionalized polymer microspheres and fibers–useful materials for immobilization of oxovanadium (IV) catalysts https://commons.ufh.ac.za/vital/access/manager/Repository/vital:51431 99%) were obtained in under 240 min with turn-over frequencies ranging from 21.89 to 265.53 h−1, depending on the quantity of catalyst and temperature. The microspherical catalysts also proved to be recyclable with no drop in activity being observed after three successive reactions. The vanadium functionalized fibers were applied in a pseudo continuous flow set-up. Factors influencing the overall conversion and product selectivity, including flow rate and catalyst quantity, were investigated. At flow rates of 1–4 mL h−1 near quantitative conversion was maintained over an extended period. Keeping the mass of catalyst constant (0.025 g) and varying the flow rate from 1–6 mL h−1 resulted in a shift in the formation of the oxidation product methyl phenyl sulfone from 60.1 to 18.6%.]]> Wed 05 Apr 2023 08:50:53 SAST ]]> The development of catalytic oxovanadium (IV)-containing microspheres for the oxidation of various organosulfur compounds https://commons.ufh.ac.za/vital/access/manager/Repository/vital:50969 Wed 05 Apr 2023 08:50:51 SAST ]]> The development of catalytic oxovanadium(IV)-containing microspheres for the oxidation of various organosulfur compounds https://commons.ufh.ac.za/vital/access/manager/Repository/vital:7324 Wed 05 Apr 2023 08:50:48 SAST ]]> An ion-imprinted polymer for the selective extraction of mercury(II) ions in aqueous media https://commons.ufh.ac.za/vital/access/manager/Repository/vital:6566 Wed 05 Apr 2023 08:50:45 SAST ]]> Oxovanadium (IV)-catalysed oxidation of dibenzothiophene and 4, 6-dimethyldibenzothiophene https://commons.ufh.ac.za/vital/access/manager/Repository/vital:51429 Wed 05 Apr 2023 08:50:40 SAST ]]> A highly selective and sensitive pyridylazo-2-naphthol-poly (acrylic acid) functionalized electrospun nanofiber fluorescence “turn-off” chemosensory system for Ni 2+ https://commons.ufh.ac.za/vital/access/manager/Repository/vital:51428 Wed 05 Apr 2023 08:50:33 SAST ]]> Photophysical and photochemical behavior of electrospun fibers of a polyurethane polymer chemically linked to lutetium carboxyphenoxy phthalocyanine https://commons.ufh.ac.za/vital/access/manager/Repository/vital:51685 Tue 31 May 2022 22:32:55 SAST ]]> A colorimetric probe for dopamine based on gold nanoparticles-electrospun nanofibre composite https://commons.ufh.ac.za/vital/access/manager/Repository/vital:45562 Tue 04 Apr 2023 05:07:26 SAST ]]> Optimal template removal from molecularly imprinted polymers by pressurized hot water extraction https://commons.ufh.ac.za/vital/access/manager/Repository/vital:51620 Tue 04 Apr 2023 05:07:20 SAST ]]> Un-functionalized gold nanoparticles as a simple colorimetric probe for sensitive and selective detection of dopamine https://commons.ufh.ac.za/vital/access/manager/Repository/vital:45522 Tue 04 Apr 2023 05:07:09 SAST ]]> Syntheses, protonation constants and antimicrobial activity of 2-substituted N-alkylimidazole derivatives https://commons.ufh.ac.za/vital/access/manager/Repository/vital:44165 2500 µg mL–1) bacteria and all the compounds were inactive against the yeast (Candida albicans).]]> Fri 09 Feb 2024 15:27:05 SAST ]]>