Nanobiotechnology Laboratory, Centre for Nanotechnology, Roorkee, Uttarakhand, 247667, India.
Department of Biotechnology, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, 247667, India.
Environ Sci Pollut Res Int. 2020 Apr;27(11):11905-11918. doi: 10.1007/s11356-019-07555-z. Epub 2020 Jan 24.
Rapid removal of toxic dye pollutants in water by conventional materials is ineffective and expensive that warrants the necessity for the architecture of hybrid nanofibrous membrane through layer by layer deposition using electrospinning method. In order to achieve this, here we demonstrated the electrospun fabrication of graphene/ferrocene intercalated polyacrylonitrile nanofibrous (GFPN) membrane through hydrothermal carbonization (HTC) method and studied its potential adsorption properties for the removal of environmental pollutants. An aqueous dispersion of graphene/ferrocene (1 mg/mL) stabilized by the polymeric backbone was prepared by the solvent homogenization method and electrospun to yield nanofibrous membrane and further characterized by several analytical and spectroscopic techniques. Raman and XPS investigations corroborated the intercalation of graphene/Fe decorated onto the nanofibrous network. Adsorption experiments found that the GFPN membrane achieved more than 90% removal of anionic Congo red (CR) dye within 30 min in the aqueous phase irrespective of the concentration and takes some additional time for attaining the equilibrium. The longevity and stability of the membrane was studied by conducting successive adsorption-desorption cycles for the regeneration of its adsorption properties. The de-coloration mechanism was comprehensively investigated through the mathematical approaches using the kinetic and intraparticle diffusion studies and confirmed with the experimental findings through IR and XPS spectroscopic techniques. In a nutshell, this work focuses on the fabrication of hybrid nanofibrous membrane and studied its adsorption properties through varying concentrations of dye (20 to 150 mg/L). Moreover, this work extensively explored the mechanism associated with the adsorption process and specifically emphasize the existence of combined phenomena during the process, i.e., anion-cation interactions, hydrogen bonding, and successive stages of intraparticle diffusion through the comparative elucidation of both theoretical and experimental approaches.
采用常规材料快速去除水中有毒染料污染物的效果不佳且成本高昂，因此有必要通过层层静电纺丝方法构建混合纳米纤维膜。为了实现这一目标，我们在这里通过水热碳化（HTC）方法展示了石墨烯/二茂铁插层聚丙烯腈纳米纤维（GFPN）膜的静电纺丝制备，并研究了其对去除环境污染物的潜在吸附性能。通过溶剂均化法制备了由聚合物主链稳定的石墨烯/二茂铁（1 mg/mL）的水性分散体，并通过静电纺丝得到纳米纤维膜，进一步通过多种分析和光谱技术进行了表征。拉曼和 XPS 研究证实了石墨烯/Fe 插层到纳米纤维网络上。吸附实验发现，GFPN 膜在水相中可在 30 分钟内实现超过 90%的阴离子刚果红（CR）染料去除，而与浓度无关，并需要额外的时间达到平衡。通过进行连续的吸附-解吸循环来再生其吸附性能，研究了膜的耐用性和稳定性。通过使用动力学和颗粒内扩散研究的数学方法全面研究了脱色机制，并通过红外和 XPS 光谱技术与实验结果进行了验证。简而言之，这项工作重点研究了混合纳米纤维膜的制备及其通过改变染料浓度（20 至 150 mg/L）进行吸附的性能。此外，这项工作还广泛探讨了与吸附过程相关的机制，并特别强调了在吸附过程中存在的结合现象，即阴离子-阳离子相互作用、氢键以及通过理论和实验方法的比较阐明的颗粒内扩散的连续阶段。
