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 R 2 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.

中文翻译：

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聚丙烯腈/羟基官能化多壁碳纳米管多层纳米纤维复合材料吸附亚甲基蓝的动力学和等温线研究

以聚丙烯腈硬纱废料和羟基官能化多壁碳纳米管（MWCNTs-OH）为原料，采用静电纺丝技术制备纳米纤维复合毡，并利用水溶液吸附亚甲基蓝染料。通过傅里叶变换 (FT) 红外光谱、FT-拉曼、扫描电子显微镜、X 射线衍射仪和热重分析仪对纳米纤维复合垫进行了表征。吸附实验研究了MWCNT-OH重量百分比、初始溶液pH、接触时间和初始染料浓度对吸附的影响。发现在最佳条件下，亚甲基蓝吸附的较高百分比为 80.05%。吸附平衡数据用 Langmuir 和 Freundlich 等温线模型研究。在Freundlich等温线模型中发现R 2 值较高，这清楚地表明Freundlich等温线模型最适合于亚甲基蓝在纳米纤维复合垫上的吸附。进行动力学研究以解释亚甲蓝在纳米纤维复合材料上的吸附率。亚甲基蓝吸附动力学研究有利于拟二级方程。