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MXene/C电催化膜制备及对水中盐酸四环素降解性能研究

作者：王虹，邵亚楠，于迪，尹振

单位：天津工业大学分离膜与膜过程国家重点实验室，分离膜科学与技术国际联合研究中心，材料科学与工程学院，天津 300387；天津科技大学化学工程与材料科学学院，天津市卤水化学工程与资源生态利用重点实验室，天津 300457

关键词： MXene；电泳沉积；MXene /C膜；盐酸四环素废水；电催化

DOI号：

分类号： TQ460.9

出版年,卷(期):页码： 2022,42(6):151-158

摘要：

本文通过电泳沉积法，将二维MXene纳米片负载到活性炭基微孔炭基膜上，制备负载MXene的炭膜（MXene/C），然后采用扫描电子显微镜（SEM）和透射电子显微镜（TEM）对原始炭基膜和MXene/C膜进行表面微观形貌分析，通过X射线衍射仪（XRD）和X射线衍射光电子能谱仪（XPS）进行化学晶型分析和元素价态分析，使用全自动接触角测量仪以及电化学工作站对原始炭基膜和MXene/C膜表面的亲水性和电化学性能进行分析，将炭膜和MXene/C膜为阳极分别构建电催化膜反应器（ECMR）用于电催化氧化降解盐酸四环素（TCH）废水，并对其降解效果进行比较。结果表明：MXene纳米片负载到炭膜表面，成功制备出MXene/C膜，与原始炭膜相比MXene /C膜的亲水性、电化学活性均有显著提升。在温度为20 ℃，停留时间为8 min，TCH废水浓度为50 mg/L，pH为7.0，电流密度为0.6 mA/cm2，电解质Na2SO4浓度为15 g/L的反应条件下，原始炭膜和MXene /C膜对TCH的去除率分别为86.4%和97.76%，TOC去除率分别为40.6%和88.57%。同时经过10次循环使用后，MXene /C膜表现出优秀的稳定性。

Two-dimensional MXene nanosheets were loaded on activated carbon-based microporous carbon membrane by electrophoretic deposition method to prepare MXene/C membranes. Surface micromorphology analysis of carbon membrane and MXene/C membrane by field emission scanning electron microscopy (SEM) and transmission electron microscopy (TEM), X-ray diffraction (XRD) was used for chemical crystal analysis, and X-ray diffraction photoelectron spectroscopy (XPS) was used for elemental valence analysis. The hydrophilicity of the membrane surface was analyzed using an automatic contact Angle measuring instrument, and the electrochemical performance was analyzed using an electrochemical workstation. Electrocatalytic membrane reactors (ECMR) were constructed with carbon membrane and MXene/C membrane as anodes for electrocatalytic oxidation degradation of tetracycline hydrochloride wastewater, and their degradation effects were compared. The results showed that the MXene nanosheets were successfully loaded on the surface of the carbon membrane, and the MXene/C membrane was successfully prepared. Compared with the original carbon membrane, the MXene/C membrane had better hydrophilicity, higher electrochemical activity, and higher removal efficiency of tetracycline hydrochloride. When the temperature was 20 ℃, residence time was 8 min, tetracycline hydrochloride wastewater concentration was 50 mg/L, pH was 7.0, current density of 0.6 mA/cm2 and an electrolyte Na2SO4 concentration of 15 g/L, the removal rates of tetracycline hydrochloride by carbon membrane and MXene/C membrane were 86.4% and 97.76%, respectively, and the TOC removal rates were 40.6 % and 88.57%. Meanwhile, after 10 cycles, the MXene/C membrane showed excellent stability.

基金项目：

国家重点研发计划（2020YFA0211002）

作者简介：

王虹（1978—），女，辽宁鞍山人，博士，副教授，主要研究方向为电催化在水处理中的应用

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