MIL-53(Al)/ZnO coated plates with high photocatalytic activity for extended degradation of trimethoprim via novel photocatalytic reactor
MIL-53(Al)/ZnO coated plates with high photocatalytic activity for extended degradation of trimethoprim via novel photocatalytic reactor
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DOI：
10.1016/j.seppur.2020.117173
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发表时间：
2020-10
影响因子：
8.6
通讯作者：
M. Samy;Mona G. Ibrahim;Mohamed Gar Alalm;M. Fujii
中科院分区：
文献类型：
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作者：
M. Samy;Mona G. Ibrahim;Mohamed Gar Alalm;M. Fujii
金属有机框架（MOFs）最近已被用于许多环境应用中，包括碳纳米管。在此，我们报告了一个开发的光催化反应器，利用一种新的复合材料MIL-53（Al）/ZnO的降解甲氧苄啶。采用水热法合成了无锌的MIL-53（Al），并以其为模板制备了MIL-53（Al）/ZnO纳米粒子。通过XRD、拉曼光谱、XPS、TEM和EDX分析证实了所需复合物的生长。使用聚硅氧烷将MIL-53（Al）/ZnO涂覆在玻璃板上;此后，将板置于光催化反应器中。通过响应面法（RSM）结合中心组合设计（CCD）进行操作参数的优化，得到最佳pH值，流速和甲氧苄啶的初始浓度分别为8.4，5.3 mL/min和6.9 mg/L。MIL-53（Al）/ZnO板连续运行5个周期，证实了其稳定的光催化活性和有效重复利用的前景。采用不同的自由基清除剂，阐明了不同的活性氧化剂物种（ROS）的贡献。通过液相色谱/串联质谱（LC-MS/MS）对转化产物进行鉴定，初步探讨了其降解途径。我们目前的研究结果强调了以保留形式使用光催化剂的优点，这可能是实际应用的途径。
Metal organic frameworks (MOFs) have been recently utilized in many environmental applications including photocatalysis. Herein, we report a developed photocatalytic reactor to exploit a novel composite of MIL-53(Al)/ZnO for the degradation of trimethoprim. Zn-free MIL53(Al) was synthesized and employed as a reactive template to obtain MIL-53(Al)/ZnO nanoparticles by hydrothermal method. The analyses by XRD, Raman spectroscopy, XPS, TEM, and EDX affirmed the growth of the desired composite. MIL-53(Al)/ZnO was coated on glass plates using polysiloxane; thereafter, the plates were placed in the photocatalytic reactor. The optimization of the operating parameters was performed by the response surface methodology (RSM) coupled with a central composite design (CCD), yielding optimum pH, flow rate, and initial trimethoprim concentration of 8.4, 5.3 mL/min, and 6.9 mg/L, respectively. The extended operation of the MIL-53(Al)/ZnO plates for five continuous cycles corroborated the stable photocatalytic activity and the prospect of effective reuse. The contributions of different reactive oxidant species (ROS) were elucidated by employing different radical scavengers. Furthermore, The degradation pathway was proposed via the identification of transformation products by liquid chromatography/tandem mass spectrometry (LC-MS/MS). Our present findings emphasize on the merits of employing the photocatalysts in a retained form, which can be an avenue for practical application of photocatalysis.