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MoN Nanorod/Sulfur-Doped Graphitic Carbon Nitride for Electrochemical Determination of Chloramphenicol
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2020-07-10 , DOI: 10.1021/acssuschemeng.0c00502
Ganesamurthi Jaysiva, Shaktivel Manavalan, Shen-Ming Chen, Pitchaimani Veerakumar, Murugan Keerthi, Huang-Shen Tu

In the present work, we report a one-step pyrolysis synthesis of molybdenum nitride nanorods (MoN NRs) using ammonium heptamolybdate tetrahydrate as a precursor. Properties of MoN NRs have been improved by the sulfur-doped graphitic carbon nitride (MoN@S-GCN) nanocomposite, which has been used to modify the glassy carbon electrode (GCE) for the electrochemical determination of chloramphenicol (CAP). The large surface area of S-GCN-anchored MoN NRs in the nanocomposite demonstrates a synergistic effect of the transport of a kinetic barrier electron and a well-defined redox cycle within the ferricyanide system. In the electrochemical determination of CAP over MoN@S-GCN/GCE, cyclic voltammetry (CV) showed a superior electrochemical response to the CAP concentration, while bare GCE and other modified GCEs showed an inferior electrochemical response. In addition, different concentrations, scanning rates, and pH electrolyte tests have been performed for MoN@S-GCN/GCE, which verified that it is an appropriate candidate for electrochemical detection of CAP. Differential pulse voltammetry (DPV) in the electrochemical determination of CAP exhibits a low detection limit of 6.9 nM and a sensitivity of 1.0557 μM μA–1 cm–2 for the current response, yielding a linear increase with increasing concentration of CAP from 0.5 to 2450 μM. Moreover, the proposed sensor shows appreciable selectivity and satisfactory recovery for real samples of milk and eye drop solutions.

中文翻译:

MoN纳米棒/硫掺杂的石墨化碳氮用于电化学法测定氯霉素

在本工作中,我们报告了使用七水合七钼酸铵为前驱体的一步热解法合成氮化钼纳米棒(MoN NRs)。MoN NRs的性能已通过硫掺杂石墨碳氮化物(MoN @ S-GCN)纳米复合材料得到改善,该纳米复合材料已被用于修饰玻碳电极(GCE),用于电化学测定氯霉素(CAP)。纳米复合材料中S-GCN固定的MoN NRs的大表面积显示出在铁氰化物体系中动力学势垒电子的运输和明确定义的氧化还原循环的协同效应。在MoN @ S-GCN / GCE上电化学测定CAP时,循环伏安法(CV)对CAP浓度显示出优异的电化学响应,而裸GCE和其他修饰的GCE则显示出较差的电化学响应。另外,已经对MoN @ S-GCN / GCE进行了不同的浓度,扫描速率和pH电解质测试,这证明它是用于CAP电化学检测的合适候选物。CAP电化学测定中的差分脉冲伏安法(DPV)的检测限低,为6.9 nM,灵敏度为1.0557μMμA–1 cm –2的电流响应,随着CAP浓度从0.5到2450μM的增加而线性增加。而且,对于牛奶和滴眼剂溶液的真实样品,建议的传感器显示出相当高的选择性和令人满意的回收率。
更新日期:2020-07-10
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