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RG O 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％，45．％和6％的复合材料进行催化，动力学常数分别高达07．17，12．1和25．11 min－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40 d后，该催化剂（nAu／n4‐NP＝45．％）仍能在240 s内完成对4‐N P的催化反应，表现出优异的催化稳定性能。
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 react‐ants ,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 as 0 7.17 ,1 2.1 ,2 5.11 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 s after holding at about 4 ℃ for 40 d ,ex‐hibiting an excellent and stable catalytic activity .
参考文献
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%