Preparation And Decoloring Performance Of Activated Carbon Nanofibers For Dye

With the industrial development in recent years, wastewater pollution has become one of the key problems to be tackled efficiently. Dyes in Wastewater are complex component, have deep chromaticity, high density and toxicity. How to efficiently remove dyes from natural water is becoming a research hotspot. Among various treatment technologies, adsorption technology is widely used for treatment of dyes wastewater owning to its simple operation, no need for extra chemical reagents and its high efficiency. Moreover, the electrochemical oxidation technology also has drawn much attention because of the capability of removing contaminants safely and effectively.In this paper, the CNT/ACF and BN/ACF composites were synthesized by incorporating CNT and BN species into PAN followed by electrospinning. The e-CNT/ACF and e-BN/ACF webs exhibit large specific surface area, high porosity and excellent adsorption performance; moreover, e-CNT/ACF composite webs as integrated electrodes have shown some advantages in terms of adsorption, conductivity and catalysis for dyes degradation by electrochemical oxidation technology, which make it an excellent electrode material for wastewater treatment.The removal of Methyl orange (MO) by adsorption was studied. In comparison with e-ACF, the e-CNT/ACF webs show a better performance in terms of the MO decolorization rate of about60%(25mg/L) for150min, increasing by nearly50%versus e-ACF under the same conditions. The study on the thermodynamic and dynamic of the adsorption shows that the adsorption experimental data of e-CNT/ACF webs for MO removal can be well fitted by Freundlich model and pseudo-second-order kinetic model. As for e-BN/ACF webs, the influence of different BN content on the adsorption abilities of e-BN/PAN for MO (25mg/L) was investigated. The results show that the decolorization rate of e-BN/PAN-35%is80%. After heat treatment, the decolorization rate of e-BN/ACF-35%webs increases to over99%only in60min. The adsorption isotherm of e-BN/ACF-35%for MO is well described by Freundlich equation and the dynamic is well fitted by pseudo-second-order kinetic model.The MO degradation by electrochemical catalytic oxidation was also studied in the present work. In comparison to the woven ACF and e-ACF webs, the e-CNT/ACF webs show a superior efficiency under the same reaction conditions. The effects of reaction conditions on the MO degradation were studied in detail, showing the optimized conditions are:the voltage of10V, the initial pH of3.0and the supporting electrolyte concentration of1g/L. The kinetics of MO degradation by electrochemical catalytic oxidation was investigated. The results show that the MO degradation over the woven ACF, e-ACF and e-CNT/ACF webs can be fitted perfectly with the first order kinetics.