Department of Applied Chemistry and Polymer Technology, Delhi Technological University (Formerly Delhi College of Engineering), Delhi, India.
Department of Polymer Science and Chemical Technology, Delhi Technological University (Formerly Delhi College of Engineering), Delhi, India.
Environ Technol. 2020 Sep;41(23):2977-2990. doi: 10.1080/09593330.2019.1593511. Epub 2019 Apr 1.
The present study reports the adsorptive removal of methyl orange (MO) from its aqueous solution by the utilization of polyaniline (PANI) nanofibers. PANI nanofibers were synthesized by the conventional interfacial polymerization method using ammonium persulphate as an oxidant in an acidic medium. The average diameter of the synthesized PANI nanofibers was found to be 60 ± 5 nm as detected by high resolution transmission electron microscope and scanning electron microscope techniques. The synthesized PANI nanofibers were characterized by fourier transform infrared spectroscopy, X-ray diffraction, UV-VIS spectroscopy, Brunauer-Emmett-Teller surface area analyzer (BET), zero energy thermonuclear apparatus and four-probe conductivity techniques and were further used for the adsorption of the MO dye from its aqueous solution using batch mode experiments. Due to their positively charged backbone, PANI nanofibers are found to be suitable for the adsorption of anionic dyes such as MO. The BET surface area of the synthesized polyaniline nanofibers was found to be 48.83 m g (higher than conventionally synthesized polyaniline). The influence of important adsorption parameters, i.e. initial dye concentration, pH and duration of contact was also studied, and the equilibrium values of these parameters are noted to be 7 mg L, pH ∼7 and 80 min, respectively. The experimental data were found to be best fitted to the pseudo-second order model ( = 0.99). The Freundlich isotherm was found to be best fitted for the adsorption of MO onto PANI nanofibers with = 0.91.
本研究报告了利用聚苯胺（PANI）纳米纤维从水溶液中吸附去除甲基橙（MO）的情况。通过在酸性介质中使用过硫酸铵作为氧化剂的常规界面聚合方法合成了 PANI 纳米纤维。通过高分辨率透射电子显微镜和扫描电子显微镜技术发现，合成的 PANI 纳米纤维的平均直径为 60±5nm。通过傅里叶变换红外光谱、X 射线衍射、紫外可见光谱、BET 表面面积分析仪、零能量热核仪和四探针电导率技术对合成的 PANI 纳米纤维进行了表征，并进一步用于使用批量实验从水溶液中吸附 MO 染料。由于其带正电荷的主链，PANI 纳米纤维适合吸附阴离子染料，如 MO。合成的聚苯胺纳米纤维的 BET 表面积为 48.83m2g-1（高于常规合成的聚苯胺）。还研究了重要的吸附参数（如初始染料浓度、pH 和接触时间）的影响，这些参数的平衡值分别为 7mgL-1、pH∼7 和 80min。实验数据最符合准二级模型（ = 0.99）。对于 MO 吸附到 PANI 纳米纤维上，Freundlich 等温线最适合， = 0.91。
