Feng Jingjing, Ran Jiaoru, Tao Minli, Zhang Wenqin
Department of Chemistry, School of Sciences, Tianjin University, Tianjin 300072, P. R. China.
National Demonstration Center for Experimental Chemistry & Chemical Engineering Education, Tianjin University, Tianjin 300350, P. R. China.
ACS Omega. 2021 Jul 16;6(29):18836-18847. doi: 10.1021/acsomega.1c02048. eCollection 2021 Jul 27.
A series of biquaternary ammonium-functionalized fibers were developed to efficiently realize selective removal of phenolic compounds from water. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were employed to determine the successful preparation of functionalized fibers. Scanning electron microscopy, X-ray diffraction (XRD) patterns, and elemental analysis were used to analyze the microstructure and composition. First, the adsorption result shows that a fiber with a three-carbon alkyl chain (PANF) has the maximum adsorption capacity for 2,4-dinitrophenol (2,4-DNP) (406 mg g). Electrostatic attraction and π-π interaction are the main forces in adsorption. The adsorption kinetics studies display that PANF can rapidly adsorb 2,4-DNP in 10 min and achieve equilibrium within 20 min. The adsorption process of 2,4-DNP by PANF follows the Langmuir model, demonstrating that the process is more consistent with monolayer adsorption. What is more, the adsorbent PANF can be reused after 10 adsorption/desorption cycles and still maintains an excellent removal rate (99%). Otherwise, PANF was used in a continuous flow process and exhibited a removal rate of more than 96%, which certifies that PANF is an excellent adsorbent and can be utilized in practice.
开发了一系列双季铵官能化纤维，以有效实现从水中选择性去除酚类化合物。采用傅里叶变换红外光谱和X射线光电子能谱来确定功能化纤维的成功制备。利用扫描电子显微镜、X射线衍射（XRD）图谱和元素分析来分析微观结构和组成。首先，吸附结果表明，具有三碳烷基链的纤维（PANF）对2,4-二硝基苯酚（2,4-DNP）具有最大吸附容量（406 mg/g）。静电吸引和π-π相互作用是吸附的主要作用力。吸附动力学研究表明，PANF能在10分钟内快速吸附2,4-DNP，并在20分钟内达到平衡。PANF对2,4-DNP的吸附过程遵循朗缪尔模型，表明该过程更符合单层吸附。此外，吸附剂PANF在10次吸附/解吸循环后可重复使用，仍保持优异的去除率（99%）。否则，PANF用于连续流动过程，去除率超过96%，这证明PANF是一种优异的吸附剂，可在实际中应用。
