文章摘要
李酽,宋双,单林曦,连晓雪,周青军.Au修饰纳米ZnO的超声化学法制备及光催化性能[J].精细化工,2021,(8):0
Au修饰纳米ZnO的超声化学法制备及光催化性能
Sonochemical fabrication and photocatalytic properties of Au-modified nano ZnO
投稿时间:2021-02-11  修订日期:2021-04-19
DOI:
中文关键词: 纳米材料  复合材料  异质结构  光化学  光催化性能
英文关键词: nanomaterials  composites  heterostructure  photochemistry  photocatalytic performance
基金项目:国家自然科学基金(U1933109)
作者单位E-mail
李酽 中国民航大学 liyan01898@163.com 
宋双 中国民航大学  
单林曦 中国民航大学  
连晓雪 中国民航大学  
周青军 中国民航大学  
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中文摘要:
      不添加任何还原剂,利用简单的超声化学法成功制备了Au修饰纳米ZnO(Au/ZnO)。以SEM、TEM、XRD、PL、UV-VIS、UV-DRS、BET等对样品进行了结构表征和性能测试。结果表明,超声化学法能够促使Au3+直接在ZnO表面被还原,Au纳米粒子沿着ZnO表面选择性生长,从而使两种材料之间形成紧密的界面结构。Au纳米粒子的修饰使得Au/ZnO在384 nm处的紫外发射峰出现蓝移,强度明显减弱,而可见区发光强度减弱直至消失,表明光生电荷被有效分离。在适量的金修饰时,Au/ZnO的紫外光吸收能力显著增强,且出现了一定程度的可见光吸收,样品光利用率得到提升。光催化实验表明,Au/ZnO能有效降解甲基橙和甲基蓝溶液。采用ln(ρ/ρt)=kt进行线性拟合,对样品的光催化降解性能进行动力学分析,当Au含量为0.5%(以ZnO物质的量为基准,下同),Au/ZnO对亚甲基蓝和甲基橙一级降解反应速率常数分别是纯ZnO的4.26和2.38倍,降解率均达到100%。
英文摘要:
      Au modified ZnO nanoparticales (Au/ZnO) were successfully prepared by a simple sonochemical method, without adding any active agent. The as-prepared products were characterized by SEM, TEM, XRD, PL, UV-VIS, UV-DRS and BET. The results show that Au3+ is directly reduced on the surface of ZnO to form nanoparticles by sonochemical method, and Au nanoparticles preferentially grow along the surface of ZnO, thus forming a close interface structure between the two materials. The modification of Au nanoparticles makes the UV peak at 384 nm shifts to blue and its intensity is obviously weakened, meanwhile, the intensity of visible luminescence peak decreases until it disappears, indicating that the photo-generated charges are effectively separated. With an appropriate amount of gold decoration, the UV light absorption capacity of the Au/ZnO was significantly enhanced, and a certain degree of visible light absorption appeared, indicating that the light utilization rate has been improved. Photocatalytic experiments show that Au/ZnO can effectively degrade methyl orange and methyl blue solutions. Kinetic analysis of the photodegradation properties using ln(ρ/ρt)=kt linear fitting shows that as the amount of Au is 0.5% (based on the amount of ZnO substance, the same below), the first order degradation reaction rate constant of methylene blue and methyl orange is 4.26 and 2.38 times of pure ZnO, respectively, and their degradation can reach 100%.
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