Mesoporous Fe-doped MgO nanoparticles as a heterogeneous photo-Fenton-like catalyst for degradation of salicylic acid in wastewater
Mesoporous Fe-doped MgO nanoparticles as a heterogeneous photo-Fenton-like catalyst for degradation of salicylic acid in wastewater
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DOI：
10.1016/j.jece.2021.105589
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发表时间：
2021-08
影响因子：
7.7
通讯作者：
Manoj Silva;J. Baltrus;C. Williams;A. Knopf;Lihua Zhang;J. Baltrusaitis
中科院分区：
文献类型：
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作者：
Manoj Silva;J. Baltrus;C. Williams;A. Knopf;Lihua Zhang;J. Baltrusaitis
采用简单的溶胶-凝胶法合成了介孔掺铁氧化镁纳米颗粒，并将其用于类Fenton光催化降解水杨酸。在反应条件下，氧化镁表面的溶解促进了pH值的提高，使铁-氧化镁催化剂具有活性，而没有检测到铁的浸出。在模拟太阳辐射条件下，当Fe-−负载量为500ppm，H_2O_2浓度为20 mM，SA浓度为50ppm时，SA被完全降解，初始速率常数为0.048×10~(-3)m in·m-1。该催化剂在5个反应周期内均保持稳定。漫反射UV-Vis测试表明，Fe-MgO催化剂的比表面积高达171×m2/g，并且含有具有八面体配位的铁催化中心的赤铁矿(Fe2O3)纳米粒子。反应后催化剂的表征表明，在反应的链引发和扩散步骤中，由于氧化还原循环，催化剂中存在一些Fe2+。
Mesoporous Fe-doped MgO nanoparticles were synthesized using a facile sol-gel method and utilized for photo-Fenton-like degradation of salicylic acid (SA). The MgO surface dissolution facilitated an increase in the pH under the reaction conditions that allowed the Fe-MgO catalyst to be active without detectable iron leaching. Under simulated solar radiation, SA was completely degraded with an initial rate constant of 0.048 min−1at the optimal reaction conditions of 500 ppm loading of 5% Fe-MgO, 20 mM H2O2concentration, and 50 ppm SA concentration. The catalyst was stable over 5 reaction cycles. The Fe-MgO catalyst was shown to have a surface area up to 171 m2/g and contain hematite (Fe2O3) nanoparticles with octahedrally coordinated iron catalytic centers, as inferred from diffuse reflectance UV–vis measurements. Post-reaction catalyst characterization showed that some Fe2+was present in the catalyst due to the redox cycle during the chain initiation and propagation steps of the reaction.