Synthesis and properties of Ag/ZnO/g-C3N4 ternary micro/nano composites by microwave-assisted method
Synthesis and properties of Ag/ZnO/g-C3N4 ternary micro/nano composites by microwave-assisted method
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微波辅助法Ag/ZnO/g-C3N4三元微纳米复合材料的合成及性能
DOI：
10.1088/2053-1591/aaa1dc
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发表时间：
2018-01
影响因子：
2.3
通讯作者：
Lu Hongxia
中科院分区：
文献类型：
--
作者：
Zhang Zijie;Li Xuexue;Chen Haitao;Shao Gang;Zhang Ray;Lu Hongxia
采用简单便捷的微波辅助方法制备了Ag/ZnO/g-C3N4三元微纳米复合材料作为新型可见光驱动光催化剂。通过X射线衍射、X射线光电子能谱、扫描电子显微镜、紫外可见漫反射光谱和红外辐射技术对所得三元结构微/纳米复合材料进行表征，以检测其相结构、价态、形貌、热学和光学性能。在微波辐射15 min、功率为240 W的条件下合成了结晶良好的Ag/ZnO/g-C3N4三元微纳复合材料。进一步实验表明Ag(5.0mol%)/ZnO/g-C3N4光催化剂在降解亚甲基蓝时表现出优异的光催化活性，其反应速率常数(k, 0.0084 min−1)为7.5, 2.4 2.9分别是单片ZnO (k, 0.0011 min−1)、ZnO/g-C3N4(k, 0.0035 min−1)、Ag(5 mol%)/ZnO(k, 0.0029 min−1)和Ag(5mol%)/g-C3N4 (k, 0.0024 min−1)的3.5倍。最后提出了Ag/ZnO/g-C3N4光催化剂降解过程中可能的光催化机理。这项工作为合成高效的 ZnO 基光催化剂提供了一种可行的策略，该催化剂结合了不同维度组分的结构和性能，并使该三元系统成为阳光驱动的光催化水处理的令人兴奋的候选者。
Ag/ZnO/g-C3N4 ternary micro/nanocomposites, as novel visible-light-driven photocatalysts, were prepared by a simple and convenient microwave-assisted method. The resulting ternary structure micro/nano composites were characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, ultraviolet–visible diffuse reflectance spectroscopy and infrared radiation techniques to examine its phase structure, valence state, morphological, thermal and optical properties. Well crystallized Ag/ZnO/g-C3N4 ternary micro/nano composites were synthesized under microwave-radiation for 15 min with the output of 240 W. Further experiments indicated Ag(5.0mol%)/ZnO/g-C3N4 photocatalyst in degradation of methylene blue exhibited an outstanding photocatalytic activity and its reaction rate constant (k, 0.0084 min−1) is 7.5, 2.4 2.9 and 3.5 times higher than that of monolithic ZnO (k, 0.0011 min−1), ZnO/g-C3N4(k, 0.0035 min−1), Ag(5 mol%)/ZnO(k, 0.0029 min−1) and Ag(5mol%)/g-C3N4 (k, 0.0024 min−1) respectively. Finally, a possible photocatalytic mechanism of Ag/ZnO/g-C3N4 photocatalyst in degradation process was proposed. This work provides a feasible strategy to synthesize an efficient ZnO-based photocatalyst which combines structure and properties of different dimensional components and made this ternary system an exciting candidate for sunlight-driven photocatalytic water treatment.
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