Nitrogen-doped carbon spheres surface modified with in situ synthesized Au nanoparticles as electrochemical selective sensor for simultaneous detection of trace nitrophenol and dihydroxybenzene isomers
Nitrogen-doped carbon spheres surface modified with in situ synthesized Au nanoparticles as electrochemical selective sensor for simultaneous detection of trace nitrophenol and dihydroxybenzene isomers
复制标题
DOI：
10.1016/j.snb.2016.06.122
复制
发表时间：
2016-12
影响因子：
8.4
通讯作者：
Haifeng Zhou;Shunxing Li;Yijin Wu;Dejian Chen;Yuhui Li;Feng-ying Zheng;Huiwu Yu
中科院分区：
文献类型：
--
作者：
Haifeng Zhou;Shunxing Li;Yijin Wu;Dejian Chen;Yuhui Li;Feng-ying Zheng;Huiwu Yu
以聚多巴胺作为氮掺杂碳前驱体，可以原位掺杂HAuCl4、氮和金的吸附剂和还原剂，并在碳球上依次进行表面修饰。通过金纳米粒子表面改性和氮掺杂的协同作用，提高了碳球的电导率、电子转移能力和电催化活性，从而提高了该电化学传感器的灵敏度。采用透射电镜、扫描电镜、傅里叶变换红外光谱、x射线光电子能谱和x射线衍射对合成的纳米复合材料进行了表征。基于吸附速率和氧化电位的差异，硝基酚异构体（邻硝基酚、间硝基酚、对硝基酚）和二羟基苯异构体（对苯二酚、儿茶酚、间苯二酚）均可通过差分脉冲伏安法同时识别、分离和测定。该方法线性范围宽（0.05 ~ 600 μmol L−1），检出限低（24 ~ 98 nmol L−1），可用于废水和天然水中硝基酚和二羟基苯异构体的同时检测。
Using polydopamine as nitrogen-doped carbon precursors, adsorbent and reducing agent of HAuCl4, nitrogen and Au nanoparticle could be in situ doped and surface modified successively into/onto carbon spheres. The conductivity, electrons transfer ability, and electrocatalytic activity of carbon sphere were improved by the synergistic effect of surface modification with Au nanoparticle and nitrogen doping and then the sensitivity of this electrochemical sensor was enhanced. The synthesized nanocomposite was characterized by transmission electron microscopy, scanning electron microscopy, and Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and X-ray diffraction. Based on the difference of adsorption rates and oxidation potentials, both nitrophenol isomers (o-nitrophenol,m-nitrophenol,p-nitrophenol) and dihydroxybenzene isomers (hydroquinone, catechol, resorcinol) could be identified, separated successfully, and determined simultaneously by differential pulse voltammetry. This proposed method with wide linear range (0.05–600 μmol L−1) and low detection limit (24–98 nmol L−1) was successfully applied for simultaneous detection of nitrophenol and dihydroxybenzene isomers in wastewater and natural water.