Au@铁球光催化剂的制备及性能  

Preparation and Properties of Au@iron Ball Photocatalyst

作　　者：乔志立 孙丽[1] QIAO Zhili;SUN Li(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学能源与动力工程学院,上海200093

出　　处：《广州化学》2025年第1期63-68,I0004,共7页Guangzhou Chemistry

摘　　要：利用白茅根提取液作为还原剂,成功合成了具有多晶结构、小粒径和类球形的Au纳米颗粒。采用静电吸附法将这些Au纳米颗粒包裹在铁球表面,成功制备出了Au@铁球光催化剂。通过紫外分光光度计(UVVis)、透射电子显微镜(TEM)、高分辨透射电子显微镜(HR-TEM)、能谱仪(EDS)、选取电子衍射(SAED)、X-射线衍射(XRD)以及原子力显微镜(AFM)等多种分析手段,对Au纳米颗粒以及Au@铁球的形貌、成分和微观形貌进行了全面表征。光催化应用结果表明:以Au@铁球光催化剂可在10 min内完全催化降解4-硝基苯酚(4-NP),速率常数可达到0.51 min^(-1);30次循环使用和6个月的长期监测,Au@铁球对4-NP的催化降解仍有较高的转化率,说明制备的Au@铁球光催化剂具有优异的光催化性能和良好的可重复使用性。Au nanoparticles with a polycrystalline structure,small particle size,and spherical shape were successfully synthesized using Rhizoma Imperatae extracts as a reducing agent.Subsequently,these Au nanoparticles were immobilized on the surface of iron ball via an electrostatic adsorption method to prepare the Au@iron ball photocatalyst.The morphology,composition,and micromorphology of the Au nanoparticles and Au@iron ball were comprehensively characterized using various analytical techniques such as ultraviolet-visible spectroscopy(UV-Vis),transmission electron microscopy(TEM),high-resolution transmission electron microscopy(HR-TEM),energy dispersive X-ray spectroscopy(EDS),selected area electron diffraction(SAED),X-ray diffraction(XRD),and atomic force microscopy(AFM).The catalytic degradation of 4-nitrophenol(4-NP)was efficiently catalyzed by Au@iron ball photocatalysts within 10 minutes,achieving a rate constant of up to 0.51 min^(-1).Furthermore,the catalytic activity of Au@iron ball remained high after 30 cycles of recycling and long-term monitoring for 6 months,indicating excellent photocatalytic performance and reusability of the prepared Au@iron ball photocatalyst.

关 键 词：白茅根 绿色合成 Au纳米颗粒 静电吸附 4-硝基苯酚 

分 类 号：X505[环境科学与工程—环境工程]