Graphitic Carbon Nitride/Chitosan Composite for Adsorption and Electrochemical Determination of Mercury in Real Samples
Graphitic Carbon Nitride/Chitosan Composite for Adsorption and Electrochemical Determination of Mercury in Real Samples
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DOI：
10.1021/acs.iecr.6b01699
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发表时间：
2016-07-27
影响因子：
4.2
通讯作者：
Habibi-Yangjeh, Aziz
中科院分区：
文献类型：
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作者：
Amiri, Mandana;Salehniya, Haneie;Habibi-Yangjeh, Aziz
在这项研究中，通过三聚氰胺热解合成了石墨相氮化碳（g - C3N4），并利用扫描电子显微镜、透射电子显微镜、X射线衍射、X射线能谱分析和傅里叶变换红外光谱对其物相、形貌、组成和结构进行了表征。采用浇铸法用g - C3N4/壳聚糖复合材料对碳糊电极进行了修饰。实验结果表明g - C3N4/壳聚糖复合材料对Hg(Ⅱ)具有优异的吸附性能。采用差分脉冲伏安法（DPV）进行定量测定。在1.0×10⁻⁶到8.0×10⁻⁵ mol/L和1.0×10⁻⁷到5.0×10⁻⁶ mol/L范围内获得了线性校准曲线。所提出的方案能够为Hg(Ⅱ)的检测提供一种高选择性和灵敏的方法，检测限为1.0×10⁻⁸ mol/L。在Fe(Ⅱ)和Cu(Ⅱ)存在的情况下进行了Hg(Ⅱ)的测定。最后，将修饰电极应用于实际样品中Hg(Ⅱ)的灵敏测定。
In this research, graphitic carbon nitride (g-C3N4) was synthesized using pyrolysis of melamine and its phase, morphology, composition, and structure were characterized by using scanning electron microscopy, transmission electron microscopy, X-ray diffraction, energy dispersive analysis of X-rays, and FT-IR spectroscopy. The modification of carbon paste electrode with g-C3N4/chitosan composite has been performed using the casting method. Experimental results demonstrated the superb adsorptive properties of g-C3N4/chitosan composite through Hg(II). Differential pulse voltammetry (DPV) was applied for quantitative determinations. The linear calibration curves is obtained in the ranges of 1.0 X 10-6to 8.0 x 10(-5) mol L-1 and 1.0 X 10(-7) to 5.0 X 10(-6) mol L-1. The proposed protocol can offer a highly selective and sensitive method for the detection of Hg(II) with a detection limit of 1.0 X 10(-8) mol L-1. Determination of Hg(II) was performed in the presence of Fe(II) and Cu(II). Finally, the modified electrode has been applied for sensitive determination of Hg(II) in real samples.