Facile synthesis of TiO2-functionalized graphene nanosheet-supported Ag catalyst and its electrochemical oxidation of nitrite
Facile synthesis of TiO2-functionalized graphene nanosheet-supported Ag catalyst and its electrochemical oxidation of nitrite
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DOI：
10.1007/s13738-015-0625-9
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发表时间：
2015-03
影响因子：
2.4
通讯作者：
Mingying Zhang;Jiangtao Liu;Fei Nie;Jianbin Zheng
中科院分区：
文献类型：
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作者：
Mingying Zhang;Jiangtao Liu;Fei Nie;Jianbin Zheng
以TiCl 3为还原剂，通过简单的化学还原GO，原位生成TiO 2作为连接剂，制备了一种新型的三明治结构纳米Ag/TiO 2功能化石墨烯复合材料。基于Ag/TiO 2/r-GO杂化材料，构建了一种测定亚硝酸根的新型电化学传感器。用透射电镜和紫外-可见吸收光谱对纳米复合材料的形貌和组成进行了表征。电化学研究表明，Ag/TiO 2/r-GO修饰电极对亚硝酸根的氧化具有良好的电催化性能。该传感器的线性范围为1.0 μM ~ 1.1 mM，检测限为0.4 μM，灵敏度为112.0 μA mM−1cm−2。将该方法应用于水样中亚硝酸根的测定，结果令人满意。
A new sandwich structure nanocomposite of Ag nanoparticles supported on TiO2-functionalized graphene nanosheet was synthesized, involving a simple chemical reduction of GO using TiCl3as reducing agent and the in situ formation of TiO2as linker between r-GO and Ag. Based on the Ag/TiO2/r-GO hybrid material, a novel electrochemical sensor for the determination of nitrite was constructed. The morphology and composition of the nanocomposite were characterized by transmission electron microscope and UV–vis absorption spectra. Electrochemical investigation indicated that Ag/TiO2/r-GO modified electrode exhibited excellent electrocatalytic performance for the oxidation of nitrite. The sensor showed a wide linear range from 1.0 µM to 1.1 mM, with the detection limit of 0.4 µM, the sensitivity of 112.0 μA mM−1cm−2. Additionally, the proposed method was successfully applied to the detection of nitrite in water samples with obtained satisfactory results.