In this study, the novel mesoporous carboxylated Mn₂O₃ nanofibers were synthesized by combination of electrospinning and sol–gel methods and in situ polymerization of acrylic acid monomer. The optimum amount of acrylic acid was determined by evaluating the results of microscopic and specific surface area analyses. The characteristic analyses exhibited the deposition of a layer containing silica and acrylic acid on the nanofiber surface. Also, Mn₂O₃ nanofibers showed a mesoporous structure which was maintained after the polymerization process. Although, the mean mesopore size on the nanofiber surface was decreased but the size of pores existing among the nanofibers increased because of increasing the nanofiber diameter. An investigation on the topography of nanofibers revealed that the average surface roughness values increased after the polymerization of acrylic acid. The coverage of Mn₂O₃ nanofiber surface by amorphous silica after the modification process was confirmed by X-ray diffraction (XRD) method. Moreover, the dye removal ability of synthesized nanofibers was evaluated and the effect of operational parameter including adsorbent dosage, pH, inorganic anions and initial dye concentration on dye removal was investigated. Adsorption isotherm and kinetic models were used to evaluate the adsorption mechanism and rate. To determine the best fit model for each system, non-linear regression along with error function were used. The results showed that the experimental data followed with Langmuir isotherm. Although the intra-particle diffusion was influenced on adsorption rate, the adsorption kinetic conformed to the pseudo-second order kinetic model. The result showed that synthesized nanofibers with high adsorption capacity might be a suitable alternative to remove dyes from colored aqueous solutions.

在这项研究中，通过电纺丝法和溶胶-凝胶法以及丙烯酸单体的原位聚合，合成了新型的介孔羧化的Mn ₂ O ₃纳米纤维。通过评估微观和比表面积分析的结果来确定丙烯酸的最佳用量。特性分析显示在纳米纤维表面上沉积了包含二氧化硅和丙烯酸的层。另外，Mn ₂ O ₃纳米纤维显示出介孔结构，该结构在聚合过程后得以保持。尽管，纳米纤维表面上的平均中孔尺寸减小了，但是由于纳米纤维直径的增加，存在于纳米纤维之间的孔的尺寸增加了。对纳米纤维形貌的研究表明，丙烯酸聚合后平均表面粗糙度值增加。Mn ₂ O ₃的覆盖率通过X射线衍射（XRD）法确认了改性处理后的无定形二氧化硅形成的纳米纤维表面。此外，评价了合成纳米纤维的脱色能力，并研究了吸附剂用量，pH，无机阴离子和初始染料浓度等操作参数对染料去除的影响。用吸附等温线和动力学模型评估吸附机理和速率。为了确定每个系统的最佳拟合模型，使用了非线性回归以及误差函数。结果表明，实验数据与Langmuir等温线一致。尽管颗粒内扩散影响吸附速率，但吸附动力学符合拟二级动力学模型。