Page 103 - 《精细化工》2021年第8期

第 38 卷第 8 期 精 细 化 工 Vol.38, No.8
202 1 年 8 月 FINE CHEMICALS Aug. 2021

催化与分离提纯技术
Au 修饰纳米 ZnO 的超声化学法制备及光催化性能

李 酽，宋 双，单林曦，连晓雪，周青军

（中国民航大学 理学院，天津 300300）

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
3+
使 Au 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，吸光度明显减弱，而绿
光区荧光峰消失，表明光生电荷被有效分离。在适量的 Au 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。Au/ZnO 能有效降解甲基橙和亚甲基蓝溶液。采
用 ln(ρ/ρ t )=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）时，Au/ZnO 对亚甲基蓝和甲基橙一级降解反应速率常数分别约为纯 ZnO 的 4.26 和 2.38
倍，降解率均达到 100%。
关键词：纳米材料；复合材料；异质结构；光化学；光催化性能；催化技术
中图分类号：O643.36；O644.1；X703 文献标识码：A
文章编号：1003-5214 (2021) 08-1597-07 开放科学 (资源服务) 标识码 (OSID)：

Sonochemical preparation and photocatalytic properties of
Au-modified nano ZnO

LI Yan, SONG Shuang, SHAN Linxi, LIAN Xiaoxue, ZHOU Qingjun
（College of Science, Civil Aviation University of China, Tianjin 300300, China）

Abstract: Au decorated ZnO nanoparticales (Au/ZnO) were successfully prepared by a simple
sonochemical method without adding any reducing agent. The structure and properties of the as-prepared
samples were characterized by SEM, TEM, XRD, PL, UV-Vis, UV-DRS and BET. The results showed that
3+
Au was directly reduced on the surface of ZnO to form nanoparticles by sonochemical method, and Au
nanoparticles preferentially grew along the surface of ZnO, thus forming a close interface structure between
the two materials. The decoration of Au nanoparticles made the emission peak of Au/ZnO at 384 nm
appeared blue shift and the absorbance obviously weakened, meanwhile, the fluorescence peak disappeared
in the green region, indicating that the photo-generated charges were effectively separated. The ultraviolet
light absorption of Au/ZnO was significantly enhanced and visible light absorption appeared to a certain
extent when the appropriate amount Au was introduced, which led to the light utilization rate was improved.
Au/ZnO could effectively degrade Methyl Orange and Methylene Blue solutions. ln(ρ/ρ t)=kt was used for
linear fitting to analyze the kinetics of the photocatalytic degradation performance of the samples. It was
found that as Au content was 0.5% (based on ZnO amount of substance, the same below), the first order
degradation reaction rate constants of Methylene Blue and Methyl Orange were about 4.26-fold and
2.38-fold that of pure ZnO, respectively, both of their degradation reached 100%.
Key words: nanomaterials; composites; heterostructure; photochemistry; photocatalytic performance;
catalysis technology

收稿日期：2021-02-11; 定用日期：2021-04-23; DOI: 10.13550/j.jxhg.20210162
基金项目：国家自然科学基金（U1933109）
作者简介：李 酽（1968—），男，教授，E-mail：liyan01898@163.com。