Polyetherimide (PEI) is recognized as a potential candidate for electrochemical sensor matrix which can be used for heavy metal ion and reactive chemical substance sensing applications. However, the relatively low conductivity of PEI material limits its usage of electrochemical sensor applications. Modifying PEI membrane considerably improve the electron conductivity and electrochemical property of polymer. Conductive polyetherimide-graphene oxide (PEI-GO) composite nanofiber membrane was synthesized via electrospinning technique in order to modify electrochemical sensor electrodes. In order to optimize the electrospinning process protocol such as viscosity, surface tension and conductivity and obtained smooth electrospun fiber, PEI were electrospun from two different solvents namely n-methyl-2-pyrrolidone (NMP) and combination of NMP/ dimethylformamide (DMF). Physical and electrical properties of the nanofiber were analysed in terms of its hydrophobicity, porosity and conductivity by manipulating the concentration of PEI from 20 wt% to 30 wt% and GO loading from 0.1 wt% to 0.5 wt%. Electrospun of 25 wt% PEI in NMP/DMF produced the highest porosity and liquid uptake of 97.81% and 2846.23% respectively. The addition of GO at 0.5 wt% into 25 wt% of PEI (NMP/DMF) improved the porosity and liquid uptake up to 98.83% and 5400%,respectively, while the conductivity increases to 32.71 µS/cm which is 10 folds higher than GO free PEI fiber. When the conductivity of drop-casted PEI-GO modified electrodes was compared to the electrospun PEI-GO fiber modified electrodes, the latter showed 2-3 folds higher. Proposed PEI-GO electrospun fiber with the enhanced conductivity, porosity and hydrophobicity along with high chemical stability can be used as an efficient conductive matrix for electrochemical electrode applications such as heavy metal ion sensing and reactive chemical sensing application.
The purpose of this study was to introduce sustainable bleaching of jute-cotton blend (Juton) fabric with Peracetic acid instead of conventional peroxide bleaching agents for the deep dyeing process. Juton was bleached with peracetic acid by varying the process conditions including temperature, pH, treatment time,concentration and the dyeing properties, fastness properties were investigated in a comparative manner. In addition, the physical properties of treated fabrics such as tensile strength, elongation, weight loss and the chemical changes of bleached fabrics were evaluated by using FT-IR. The morphological surface changes of bleached fabric were confirmed by SEM. Peracetic acid and hydrogen peroxide bleaching effluents were analyzed by measuring BOD, COD, TDS and DO values. The highest color strength was obtained at 70̊C,using neutral pH (7), concentration 20 mg/L in 80 min treatment time based on peracetic acid bleaching agent for Juton fabric. Peracetic acid bleaching of Juton fabric was found to be higher tensile strength and elongation than H2O2 bleaching. Peracetic acid bleaching effluent exhibited lower BOD, COD, TDS and higher DO than hydrogen peroxide bleaching effluent. Moreover, peracetic acid bleaching provided higher fastness to washing,light and rubbing than hydrogen peroxide bleaching.