新型 Fe-Cu 层状双氢氧化物/生物炭纳米复合材料的简便水热合成及其增强超声催化降解头孢唑林钠的性能
Facile hydrothermal synthesis of novel Fe-Cu layered double hydroxide/biochar nanocomposite with enhanced sonocatalytic activity for degradation of cefazolin sodium.
机构信息
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran.
Research Laboratory of Advanced Water and Wastewater Treatment Processes, Department of Applied Chemistry, Faculty of Chemistry, University of Tabriz, 51666-16471, Tabriz, Iran; Department of Materials Science and Nanotechnology Engineering, Faculty of Engineering, Near East University, 99138, Nicosia, North Cyprus, Mersin 10, Turkey.
出版信息
J Hazard Mater. 2020 Jan 5;381:120742. doi: 10.1016/j.jhazmat.2019.120742. Epub 2019 Jun 6.
This study reports the successful synthesis of Fe-Cu layered double hydroxide (Fe-Cu-LDH) /biochar (BC) nanocomposite by a hydrothermal method. The sonocatalytic performance of Fe-Cu-LDH/BC nanocomposite was investigated for the degradation of cefazolin sodium (CFZ), as a model emerging contaminant, from the solution. The physico-chemical properties of the synthesized samples were analyzed by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), Brunauer-Emmett-Teller (BET), high-resolution transmission electron microscopy (HRTEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FT-IR), and UV-Vis diffuse reflectance spectroscopy (DRS) analyses. The best sonocatalytic efficiency of 97.6% was achieved by using 1.0 g/L sonocatalyst, 0.1 mM CFZ, and an ultrasonic power of 300 W at pH = 6.5 (natural) within 80 min. Additionally, the effects of the addition of various oxidants, dissolved gases, and organic and inorganic scavengers on the degradation of CFZ were studied. Moreover, the possible sonocatalytic mechanism of the sonochemical degradation of CFZ in the presence of Fe-Cu-LDH/BC sonocatalyst was proposed based on the results of GC-MS analysis. The mineralization of CFZ solution was evaluated using COD and IC analyses. Finally, the reusability test of Fe-Cu-LDH/BC nanocomposite in the CFZ degradation revealed that almost 9% drop occurred after five successive cycles.
本研究通过水热法成功合成了 Fe-Cu 层状双氢氧化物（Fe-Cu-LDH）/生物炭（BC）纳米复合材料。采用超声技术，研究了 Fe-Cu-LDH/BC 纳米复合材料对偶氮头孢菌素钠（CFZ）的降解性能，CFZ 是一种新兴的污染物。通过 X 射线衍射（XRD）、扫描电子显微镜（SEM）、能谱分析（EDX）、BET 比表面积分析、高分辨率透射电子显微镜（HRTEM）、X 射线光电子能谱（XPS）、傅里叶变换红外光谱（FT-IR）和紫外可见漫反射光谱（DRS）等分析手段对合成样品的物理化学性质进行了分析。在超声功率为 300 W、pH = 6.5（自然）、超声催化剂用量为 1.0 g/L、CFZ 初始浓度为 0.1 mM 的条件下，80 min 内，该催化剂对 CFZ 的降解率达到了 97.6%。此外，还研究了添加各种氧化剂、溶解气体、有机和无机猝灭剂对 CFZ 降解的影响。此外，根据 GC-MS 分析结果，提出了在 Fe-Cu-LDH/BC 超声催化剂存在下，CFZ 的超声降解可能的声催化机制。采用 COD 和 IC 分析对 CFZ 溶液的矿化程度进行了评价。最后，对 Fe-Cu-LDH/BC 纳米复合材料在 CFZ 降解中的重复使用性能进行了测试，结果表明，在五次连续循环后，其活性仅下降了 9%。
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