Well-designed Ag/ZnO/3D graphene structure for dye removal: Adsorption, photocatalysis and physical separation capabilities
Well-designed Ag/ZnO/3D graphene structure for dye removal: Adsorption, photocatalysis and physical separation capabilities
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DOI：
10.1016/j.jcis.2018.10.102
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发表时间：
2019-03-01
影响因子：
9.9
通讯作者：
Moshfegh, Alireza Z.
中科院分区：
文献类型：
--
作者：
Kheirabadi, Malihe;Samadi, Morasae;Moshfegh, Alireza Z.
本研究采用吸附和光催化降解工艺去除废水中的有机染料。为此，采用水热-光沉积相结合的方法制备了一种新型的基于银纳米颗粒/氧化锌纳米棒/三维石墨烯网络的三元纳米结构(银纳米颗粒/氧化锌纳米棒/三维石墨烯网络)。用场发射扫描电子显微镜(FESEM)表征了石墨烯水凝胶作为氧化锌纳米棒生长载体的三维结构。此外，用透射电子显微镜测定了在平均长径比为5的氧化锌纳米棒上生长的银纳米粒子的直径在30-80 nm范围内。X-射线衍射图显示了六方纤锌矿结构的氧化锌纳米棒和面心立方(Fcc)的银纳米颗粒的(111)晶面。动力学研究表明，合成的3DG对染料的吸附容量约为300 mg/g。在紫外光和可见光照射下，所制备的Ag/ZnO/3DG三元样品的光催化降解活性均高于ZnO/3DG和3DG结构。采用不同的载流子清除剂，探讨了吸附与可见光催化降解染料的协同作用机理。光催化剂回收的简便性和染料的高清除率在未来的应用中具有很好的应用前景，例如在太阳能照射下有效地去除工业废水中的有机污染物。(C)2018 Elsevier Inc.保留所有权利。
In this research, adsorption and photocatalytic degradation process were utilized to remove organic dye from wastewater. To accomplish that, a newly-designed ternary nanostructure based on Ag nanoparticles/ZnO nanorods/three-dimensional graphene network (Ag NPs/ZnO NRs/3DG) was prepared using a combined hydrothermal-photodeposition method. The three-dimensional structure of graphene hydrogel as a support for growth of ZnO nanorods was characterized using field emission scanning electron microscopy (FESEM). In addition, diameter of silver nanoparticles grown on the ZnO nanorods with the average aspect ratio of 5 was determined in the range of 30-80 nm by using transmission electron microscopy (TEM). The X-ray diffraction (XRD) pattern was revealed hexagonal Wurtzite structure of ZnO nanorods and the (1 1 1) lattice plane of the face-centered cubic (FCC) of the silver nanoparticles. The dye adsorption capacity of the synthesized 3DG was evaluated at about 300 mg/g using kinetic study. The photocatalytic dye degradation under both UV and visible light irradiation exhibited an enhanced activity of the prepared ternary Ag/ZnO/3DG sample in comparison to ZnO/3DG and 3DG structures. Different charge-carrier scavengers were utilized to elucidate the synergistic effect of adsorption and visible-light photocatalytic degradation mechanism for dye removal. The facile photocatalyst recovery as well as the high elimination rate of dye is promising for future applications such as efficient removal of organic contaminants from industrial wastewater under solar irradiation. (C) 2018 Elsevier Inc. All rights reserved.