Abstract. Electrospun polyacrylonitrile nanofiber mats (es-PAN nanofiber mats) were surface modified by 2,4-dinitrophenyl-hydrazine (2,4-DNPH) to yield the metal ion adsorption material (es-PAN-DNPH nanofiber mats) and were investigated their adsorption behaviors. Functional modification of the es-PAN nanofiber mats and conventional polyacrylonitrile fibers (c-PAN fibers) were prepared by using 4% (w/v) of 2,4-DNPH in 1,2-ethandiol at 110°C for 6 h to obtained c-PAN-DNPH fibers. The average diameter of the es-PAN-DNPH nanofiber mats was 0.25 !m, which was comparatively smaller than the es-PAN precursor. Their functional groups were confirmed by Fourier transform infrared spectroscopy (FT-IR) and their adsorption behaviors to trace Ag(I), Bi(III), Ga(III), and In(III) from aqueous solutions and were investigated by the induced couple plasma technique. The FT-IR spectra showed the existence of NN=C-NHNH-, O=C-NHNH-, and -NO 2 functional groups for metal complexes. The adsorption capacities of the obtained es-PAN-DNPH were 7.14 to 36.36% higher than those of c-PAN-DNPH fibers. All adsorption plots onto es-PAN-DNPH nanofiber mats and c-PAN-DNPH fibers followed the Langmuir isotherm and indicated monolayer adsorption characteristics.
This research was to investigate the effect of silanization of 3-(trimethoxysilyl) propyl methacrylate of polyvinyl alcohol (PVA) as a binder and compatibilizer for the production of a pulp fibre sheet based agricultural waste of banana pseudo stem fibre and laminating with polylactic acid (PLA), respectively. The modification of PVA was successful by a confirmation of FTIR. As a result of mechanical-thermal analysis (DMTA), the modified PVA performed prominence as a compatibilizer in the combination of PLA and pulp sheet for the lamination process. It influenced to improve storage modulus roughly up to 50% while performing more viscous. Similarly, the tensile test also confirmed the improved properties. Interestingly, the biocomposite laminate as used in the modified PVA showed more hydrophilic rather than unmodified. A microbial growth test by Aspergillus niger also revealed the modified PVA influencing more severe biodegradation on the laminate.
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