金银合金纳米颗粒的可控合成及其光催化性能  

Controllable synthesis of Au-Ag alloy nanoparticles and their photocatalytic properties

作　　者：孙丽[1] 王法 吕鹏程 李浩男 苏文献[1] 章立新[1] SUN Li;WANG Fa;Lü Peng-cheng;LI Hao-nan;SU Wen-xian;ZHANG Li-xin(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：《中国环境科学》2018年第7期2542-2548,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(11404210)

摘　　要：以果糖为还原剂和表面活性剂,可控合成了平均粒径小于14.6nm的金银(Au-Ag)合金纳米颗粒.基于一步法,改变合成时间(1~8min),Au-Ag合金纳米颗粒的成分及其表面等离子共振(SPR)波长被连续调控.采用UV-Vis、EDX、ICP、XPS、TEM、HR-TEM和SAED等分析手段对Au-Ag合金纳米颗粒进行表征,发现制备的合金纳米颗粒具有均匀的成分和合金结构.由于Au、Ag两元素的协同作用,Au-Ag合金纳米颗粒在4-硝基苯酚的光催化降解反应中表现出了优异的光催化活性和稳定性.除了改变Au-Ag合金纳米颗粒的添加量,光催化反应的动力学速率常数还可通过改变合金成分来线性调节.基于可控合成,动力学速率常数甚至可通过Au-Ag合金纳米颗粒的合成时间来线性调控.上述控制动力学速率常数的方法可为其他的光催化反应提供参考.Au-Ag alloy nanoparticles(NPs)less than 14.6nm in size were synthesized using fructose as reductant and surfactant.Au-Ag alloy NPs were continuously obtained by changing the synthesis time from 1 to 8 min in one-pot.Au-Ag alloy NPs were characterized by means of UV-Vis,EDX,ICP,XPS,TEM,HR-TEM and SAED analyses.It was found that Au-Ag alloy NPs had homogeneous composition and alloy microstructure.As-prepared Au-Ag alloy NPs exhibited a superior photocatalytic activity and stability for 4-nitrophenol degradation due to the synergistic effect between Au and Ag elements.The kinetic rate constant of 4-nitrophenol degradation could be controlled linearly by the composition of Au-Ag alloy NPs besides their addition amount.Based on the controllable synthesis of Au-Ag alloy NPs,the kinetic rate constant could even be adjusted linearly by their synthesis time.The above methods to control the kinetic rate constant provide promising routes for other photocatalytic reactions.

关 键 词：果糖 Au-Ag合金纳米颗粒 4-硝基苯酚 光催化剂 太阳光 

分 类 号：X505[环境科学与工程—环境工程]