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One-step Bridging of g-C3N4 and Graphene Oxide by Successive Electrolysis for Constructing Electrochemical Sensor of Pb2+
Chinese Journal of Analytical Chemistry ( IF 1.2 ) Pub Date : 2021-09-09 , DOI: 10.1016/s1872-2040(21)60115-9
Zhe-Han YANG 1 , Xiao-Yan WU 2 , Xue-Cheng LIU 1 , Meng-Meng XU 1
Affiliation  

Synthesis methods of composites materials can tailor individual materials properties and make the composite possess more superior performance than individual materials. Herein, by combining –NH2 group in graphitic carbon nitride (g-C3N4) and a facile electrolytic route, g-C3N4-bridging reduced graphene oxide nanocomposite (g-C3N4/r-GO) was successfully prepared to construct chemical sensor for detection of Pb2+. Because g-C3N4 contains a large amount of –NH2 group, covalent bonds as bridges between GO and g-C3N4 could be successfully formed by successively electrolyzing, which simultaneously induced removal of electron withdrawing group in r-GO. Such bridges could shorten the planar distance between GO and g-C3N4 in comparison with the conventional π-π stacking, improving the electrochemical performance of r-GO and g-C3N4. Moreover, the above unique chemical structure of g-C3N4/r-GO not only exhibited excellent electrical conductivity but also provided plenty active sites to chelate Pb2+ from solution. Therefore, the prepared g-C3N4/r-GO ensured chemical sensor for Pb2+detection with wide linear range (1.0–300 μg/L) and low detection limit (0.15 μg/L at S/N = 3). This simple method could also be extended to preparation of other elements-contained nanomaterials functionalized oxide graphene for improve its properties and widen its potential applications.



中文翻译:

g-C3N4与氧化石墨烯连续电解一步桥接构建Pb2+电化学传感器

复合材料的合成方法可以定制单个材料的特性,使复合材料具有比单个材料更优越的性能。在此,通过结合石墨氮化碳(gC 3 N 4)中的–NH 2基团和简便的电解路线,成功制备了gC 3 N 4 -桥接还原氧化石墨烯纳米复合材料(gC 3 N 4 /r-GO)以构建化学结构。用于检测 Pb 2+ 的传感器。由于gC 3 N 4含有大量的-NH 2基团,共价键作为GO和gC 3 N 4之间的桥梁可以通过连续电解成功形成,同时诱导去除 r-GO 中的吸电子基团。与传统的π-π堆叠相比,这种桥可以缩短GO和gC 3 N 4之间的平面距离,提高r-GO和gC 3 N 4的电化学性能。此外,gC 3 N 4 /r-GO的上述独特化学结构不仅表现出优异的导电性,而且还提供了大量的活性位点从溶液中螯合Pb 2+。因此,制备的 gC 3 N 4 /r-GO 确保了 Pb 2+ 的化学传感器具有宽线性范围 (1.0–300 μg/L) 和低检测限(S / N = 3 时为 0.15 μg/L )的检测。这种简单的方法也可以扩展到制备其他含有元素的纳米材料功能化氧化物石墨烯,以改善其性能并扩大其潜在应用。

更新日期:2021-09-10
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