【摘要】 NaBH4还原的石墨烯(RGO)膜上原位生长金纳米粒子(Au NPs),用获得的Au NPs/RGO复合材料催化有机污染物对硝基苯酚(4-NP)的还原。复合材料制备过程中未添加其它还原剂和表面活性剂,利用RGO对Au3+进行还原,Au NPs在RGO表面分布均匀密集,可以有效改善RGO材料的亲水性和催化剂在水相反应体系中的分散性。另外,Au NPs表面无包覆剂,有利于Au表面活性位点与反应物的充分接触,大幅提高催化效率。实验结果表明,在反应体系中加入nAu/n4-NP=3%,4.5%和6%的复合材料进行催化,动力学常数分别高达0.717,1.21和2.511min-1,催化性能远优于同等摩尔(nAu/n4-NP=4.5%)的单一Au NPs。在约4℃静置40d后,该催化剂(nAu/n4-NP=4.5%)仍能在240s内完成对4-NP的催化反应,表现出优异的催化稳定性能。更多还原

【Abstract】 We studied the in-situ synthesis of Au nanoparticles(Au NPs)on NaBH4-reduced reduction graphene oxide(RGO)film.And this as-prepared Au NPs/RGO hybrid material was used to catalyze the reduction of 4-nitrophenol(4-NP).Au NPs were reduced by RGO and had an uniform and dense coverage on RGO film.It greatly weakened the hydrophobic of RGO and turned it into a hydrophilic material.In addition,there were no surfactants capped on the surface of Au NPs,which ensured the fully-contact between active sites and reactants,thus improving the catalytic rate considerably.The results showed that the Au NPs/RGO hybrids(nAu/n4-NP=3%,4.5%and 6%)could all end the reduction reaction of 4-NP rapidly with kinetic constants as high as0.717,1.21,2.511 min-1 respectively,higher than adding the same molar weight(nAu/n4-NP=4.5%)of Au NPs.This hybrid(nAu/n4-NP=4.5%)could still end the reaction within 240 safter holding at about 4 ℃for 40 d,exhibiting an excellent and stable catalytic activity.更多还原