Synergetic effect of polydopamine particles and in-situ fabricated gold nanoparticles on charge-dependent catalytic behaviors  

作　　者：Xia Han Xiaolu Chen Mengfei Yan Honglai Liu 

机构地区：[1]Key Laboratory for Advanced Materials and School of Chemistry & Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China

出　　处：《Particuology》2019年第3期63-70,共8页颗粒学报（英文版）

基　　金：The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (No. 91534103);the PetroChina Innovation Foundation (No. 2017D-5007-0204);the 111 Project of the Ministry of Education of China (No. B08021);Fundamental Research Funds for the Central Universities of China.

摘　　要：The versatile catechol unit of polydopamine (PDA) endows this molecule with a broad ranging adhesive properties and reducibility.We prepared free-standing PDA particles by a simple self-polymerization and these particles served as both an effective reductant and scaffold for a hybrid catalyst.The raspberrylike nanocomposites featured a high density of AuNPs uniformly deposited on PDA particles (PDA@Au).This system was prepared in-situ with assistance from the active catechol and amine groups of the PDA particles.To quantify the effect of the PDA carriers,we studied the catalytic activity of the PDA and PDA@Au particles.The PDA particles showed a pronounced charge-dependent catalytic activity for reduction of cationic methylene blue,negatively-charged 4-nitrophenolate,and zwitterionic rhodamine B in the presence of borohydride,whereas PDA@AuNPs showed catalytic activity with a less pronounced charge-dependence of the catalytic efficiency of the AuNPs.The PDA particles served as a redox mediator and adsorbent accelerator in degradation of the dyes owing to its unique chemical structure.

关 键 词：Poiydopamine Gold NANOPARTICLE Hybrid catalyst ADSORBENT Redox MEDIATOR 

分 类 号：O3[理学—力学]