Dlamini Mbongiseni Lungelo, Bhaumik Madhumita, Pillay Kriveshini, Maity Arjun
Department of Applied Chemistry, University of Johannesburg, 2028, Doornfontein, Johannesburg, South Africa.
Department of Physics, University of South Africa, Johannesburg, 1710, South Africa.
Heliyon. 2021 Oct 21;7(10):e08180. doi: 10.1016/j.heliyon.2021.e08180. eCollection 2021 Oct.
Polyaniline nanofibers (PANI NFs) were synthesized and employed as potential adsorbents in a continuous flow fixed-bed column adsorption study for an organic dye, Methyl Orange (MO) removal from water. These nanostructured adsorbents were characterized using ATR-FTIR, FE-SEM, HR-TEM, TGA, BET, XRD, XPS, and the Zeta-sizer. Morphological representations from SEM and TEM analyses showed that the fibers were nanosized with diameters lower than 80 nm and an interconnected network possessing a smooth surface. The S of the PANI NFs was found to be 35.80 m/g. The impact of column design parameters for instance; influent concentration, flow rate, and bed mass was investigated using pH 4 influent MO solutions optimized through batch studies. The best influent concentration, bed length, and flow rate for this study were determined as 25 mg/L, 9 cm (6 g), and 3 mL/min, respectively. The column information was fitted in Thomas, Yoon-Nelson, and Bohart-Adams models. It appeared that the Thomas and Yoon-Nelson models described the data satisfactorily. The PANI NFs were able to treat 29.16 L of 25 mg/L MO solution at 9 cm bed length. A sulfate peak in a de-convoluted sulfur spectrum using XPS verified the successful adsorption of Methyl Orange.
合成了聚苯胺纳米纤维（PANI NFs），并将其用作连续流固定床柱吸附研究中的潜在吸附剂，用于从水中去除有机染料甲基橙（MO）。使用ATR-FTIR、FE-SEM、HR-TEM、TGA、BET、XRD、XPS和Zeta粒度分析仪对这些纳米结构吸附剂进行了表征。SEM和TEM分析的形态学表征表明，纤维为纳米尺寸，直径小于80 nm，且具有光滑表面的相互连接网络。发现PANI NFs的比表面积为35.80 m²/g。使用通过批量研究优化的pH值为4的进水MO溶液，研究了柱设计参数（如进水浓度、流速和床层质量）的影响。本研究确定的最佳进水浓度、床层长度和流速分别为25 mg/L、9 cm（6 g）和3 mL/min。将柱信息拟合到Thomas、Yoon-Nelson和Bohart-Adams模型中。结果表明，Thomas和Yoon-Nelson模型对数据的描述令人满意。在9 cm床层长度下，PANI NFs能够处理29.16 L的25 mg/L MO溶液。使用XPS对解卷积硫光谱中的硫酸盐峰进行分析，验证了甲基橙的成功吸附。
