Au/graphene hydrogel: synthesis, characterization and its use for catalytic reduction of 4-nitrophenol
Au/graphene hydrogel: synthesis, characterization and its use for catalytic reduction of 4-nitrophenol
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Au/石墨烯水凝胶：合成、表征及其在 4-硝基苯酚催化还原中的应用
DOI：
10.1039/c2jm16386a
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发表时间：
2012-01-01
影响因子：
--
通讯作者：
Liu, Yun
中科院分区：
文献类型：
--
作者：
Li, Jing;Liu, Chun-yan;Liu, Yun
首次在水热条件下通过Au/石墨烯自组装制备了直径为1.08 cm、高为1.28 cm的圆柱形Au/石墨烯水凝胶。含有2.26wt% Au、6.94wt%石墨烯和90.8wt%水的水凝胶表现出优异的将4-硝基苯酚（4-NP）还原为4-氨基苯酚（4-AP）的催化性能，其比先前报道的海绵状Au纳米颗粒的值大约90倍，比聚合物负载的Au纳米颗粒催化剂中的最高值大14倍。高催化活性源于石墨烯的协同效应：（1）石墨烯对4-NP的高吸附能力，在石墨烯上的Au纳米颗粒附近提供高浓度的4-NP;和（2）电子从石墨烯转移到Au纳米颗粒，促进4-NP分子吸收电子。
A cylindrical piece of Au/graphene hydrogel, 1.08 cm in diameter and 1.28 cm in height, has been synthesized through the self-assembly of Au/graphene sheets under hydrothermal conditions for the first time. The hydrogel, containing 2.26 wt% Au, 6.94 wt% graphene, and 90.8 wt% water, exhibited excellent catalytic performance towards the reduction of 4-nitrophenol (4-NP) to 4-aminophenol (4-AP), which is about 90 times larger than previously reported values for spongy Au nanoparticles and 14 times more than the highest value among the polymer supported Au nanoparticle catalysts. The high catalytic activity arises from the synergistic effect of graphene: (1) the high adsorption ability of graphene towards 4-NP, providing a high concentration of 4-NP near to the Au nanoparticles on graphene; and (2) electron transfer from graphene to Au nanoparticles, facilitating the uptake of electrons by 4-NP molecules.