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An electrospun nanofibrous composite mat was prepared from polyacrylonitrile yarn waste and graphene oxide. The physical and chemical properties of the nanofibrous composites were characterized using attenuated total reflections Fourier transform infrared, scanning electron microscopy, X-ray diffractometer, and TGA studies. The mean fiber diameters of the pristine polyacrylonitrile yarn waste nanofiber, polyacrylonitrile yarn waste/0.5 wt% graphene oxide, polyacrylonitrile yarn waste/1.0 wt% graphene oxide, and polyacrylonitrile yarn waste/1.5 wt% graphene oxide nanofibrous composites were in the range of 41-50, 31-40, 31-40, and 31-40 nm, respectively. The mean pore sizes of the polyacrylonitrile yarn waste nanofiber, polyacrylonitrile yarn waste/0.5 wt% graphene oxide, polyacrylonitrile yarn waste/1.0 wt% graphene oxide, and polyacrylonitrile yarn waste/1.5 wt% graphene oxide nanofibrous composites were 0.5541, 0.4533, 0.4229, and 0.4168 lm, respectively. The maximum dye removal efficiency was attained in the polyacrylonitrile yarn waste/1.5 wt% graphene oxide composite at basic pH.

Nanofibrous composite mat was prepared using polyacrylonitrile hard yarn waste and hydroxyl group functionalized multiwall carbon nanotubes (MWCNTs-OH) by electrospinning technique and exploit for methylene blue dye adsorption from aqueous solution. The nanofibrous composite mat was characterized by Fourier transform (FT) infrared spectroscopy, FT-Raman, scanning electron microscopy, X-ray diffractometer and thermogravimetric analyser. The adsorption experiments were studied to investigate the effect of MWCNT-OH weight percentage, initial solution pH, contact time and initial dye concentration on the adsorption. The higher percentage of methylene blue adsorption was found to be 80.05% under optimal condition. The adsorption equilibrium data were studied with Langmuir and Freundlich isotherm models. The R2 value was found to be higher in the Freundlich isotherm model which was clearly indicated that the Freundlich isotherm model is most suitable for the adsorption of methylene blue on nanofibrous composite mat. The kinetic study was carried out to explain the adsorption rate of methylene blue on nanofibrous composite. The kinetic study of methylene blue adsorption was favourable to the pseudo second-order equation.

Tensile and in-vitro degradation study of electro spun fibrous mat produced from eri silk fibroin Fibrous mat was produced from eri silk fibroin by electro spinning. The fibrous mat was tested for tensile properties and in-vitro bio-degradation by enzymatic treatment. The tensile strength of the mat was 5.3 MPa and its elastic modulus was 49 MPa before bio-degradation. The weight loss obtained after 30 days of degradation was 34 %. The in-vitro enzymatic degradation of fibrous mat was confirmed through Scanning electron microscopy and Fourier transform infrared spectroscopy studies.

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