多巴胺在碱性溶液中发生氧化自聚得到聚多巴胺（PDA），PDA颗粒表面的强粘附性和所含活性官能团使其在多功能复合材料的制备中具有广泛应用。利用PDA的弱还原性和粘附性可原位制备纳米金颗粒，并使得其负载于PDA表面得到PDA@Au复合颗粒；通过对比不同溶液pH及不同反应温度条件下PDA和PDA@Au催化性能的差异发现，两者均可催化罗丹明B的降解反应，但PDA@Au的催化效率远高于PDA，且其催化活性基本不受溶液pH的影响。为简单、高效、普适的催化剂体系的制备提供了新思路。

Dopamine (DA) can be oxidized and self-polymerized to form polydopamine (PDA) under alkaline conditions.The strong adhesion and active functional groups on the surface of PDA particles make them widely used in the preparation of multifunctional composites.PDA@Au composite particles can be gained through loading gold nanoparticles,which is made by in-situ method,on the surface of PDA by means of weak reduction and adhesion of PDA.Both PDA particles and PDA@Au composite particles are used to catalyze the reduction of Rhodamine B in the presence of NaBH₄.It is found through comparing their catalytic performances under different pH values and different temperature that PDA@Au particles exhibit more excellent performance.Additionally,the excellent catalytic performance of PDA@Au composite particles is not affected by pH value of the solution.This method provides a new idea for the preparation of simple,efficient and universal catalyst system.

李遥(1992-),女,硕士,研究方向为Pickering界面催化,13162231018@163.com