Solar detoxification of water polluted with fungicide residues using ZnO-coated magnetic particles
Solar detoxification of water polluted with fungicide residues using ZnO-coated magnetic particles
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DOI：
10.1016/j.cej.2017.07.131
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发表时间：
2017-12-15
影响因子：
15.1
通讯作者：
Navarro, Simon
中科院分区：
文献类型：
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作者：
Fenoll, Jose;Garrido, Isabel;Navarro, Simon
成功制备了 ZnO（红锌矿）涂层磁性颗粒，并通过不同技术（XRD、FE-SEM、EDX 和 FTIR）对其进行了表征。磁性颗粒的光催化效率通过其降解暴露于太阳照射的水中六种杀菌剂的能力来评估。由 ZnO 涂层下方的二氧化硅底涂层组成的磁性颗粒 (MSZP) 比仅负载 ZnO 的磁性颗粒 (MZP) 更有效地催化去除这些杀菌剂。 SiO2 与 ZnO 的最佳质量比约为 1:2，因为 ZnO 表面覆盖几乎完全覆盖，并且所研究的杀菌剂获得高光催化降解率，与 ZnO 纳米粉末获得的光催化降解率相当。然而，与 ZnO 纳米粉末相比，使用 MSZP 的 Zn 光溶解较低，实验结束时 Zn2+ 浓度 (0.75 mg L-1) 低于饮用水中法律允许的水平。此外，还研究了杀菌剂初始浓度的影响，以了解最大降解效率。最后，添加 Na2S2O8 (250 mg L-1) 提高了 MSZPs 的光降解活性。因此，串联 MSZPs/Na2S2O8 提供了一种降解水中某些有机污染物的有趣方法。
ZnO (zincite) coated magnetic particles were successfully prepared and characterized by different techniques (XRD, FE-SEM, EDX, and FTIR). The photocatalytic efficiency of the magnetic particles was assessed by their ability to degrade six fungicides in water exposed to solar irradiation. Magnetic particles composed of a silica undercoat beneath a ZnO coating (MSZPs) were more efficient than magnetic particles loaded with ZnO alone (MZPs) for catalysing the removal of these fungicides. The optimum mass ratio of SiO2 to ZnO was about 1: 2 because of almost complete coverage by ZnO surface coverage and the high photocatalytic degradation rates obtained for the studied fungicides, which was comparable to that obtained with ZnO nanopowder. However, in contrast to ZnO nanopowder, the photodissolution of Zn using MSZPs was low, with Zn2+ concentration at the end of the experiment (0.75 mg L-1) below legally permitted levels in drinking water. In addition, the effect of initial concentration of fungicides was studied in order to know maximum degradation efficiency. Finally, the photodegradation activity of MSZPs was increased by the addition of Na2S2O8 (250 mg L-1). Therefore, the tandem MSZPs/Na2S2O8 provides an interesting method to degrade some organic pollutants in water.