Li Meng, Peng Xianyun, Liu Xijun, Wang Huaisheng, Zhang Shusheng, Hu Guangzhi
College of Chemistry, Zhengzhou University Zhengzhou 450000 China
Institute for New Energy Materials and Low-Carbon Technologies, Tianjin University of Technology Tianjin 300384 China.
RSC Adv. 2021 Aug 31;11(46):28988-28995. doi: 10.1039/d1ra05517h. eCollection 2021 Aug 23.
Herein, single-atom niobium-doped boron-carbon-nitrogen nanotubes (SANb-BCN) were synthesized and utilized to fabricate an electrochemical sensor for the detection of nitrobenzene (NB), an environmental pollutant. SANb-BCN were characterized through scanning transmission electron microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction analysis, and Raman spectroscopy. The Nb-BNC material modified on a glassy carbon electrode (GCE) showed an excellent electrochemical response behavior toward NB. The SANb-BCN-modified GCE (SANb-BCN/GCE) gave rise to a prominent NB reduction peak at -0.6 V, which was positively shifted by 120 mV from the NB reduction peak of the bare GCE. Furthermore, the NB peak current (55.74 μA) obtained using SANb-BCN/GCE was nearly 42-fold higher than that using the bare GCE (1.32 μA), indicating that SANb-BCN/GCE is a highly sensitive electrochemical sensor for NB. An ultralow limit of detection (0.70 μM, S/N = 3) was also achieved. Furthermore, the SANb-BCN/GCE sensor was found to possess favorable anti-interference ability during NB detection; thus, the presence of various organic and inorganic coexisting species, including Mg, Cr, Cu, K, Ca, NH, Cd, urea, 1-bromo-4-nitrobenzene, 3-hydroxybenzoic, terephthalic acid, 1-iodo-4-nitrobenzene, and toluene, minimally affected the NB detection signal. Notably, the SANb-BNC sensor material exhibited high sensitivity and specificity toward detection of NB in environmental samples. Thus, the use of the proposed sensor will serve as an effective alternative method for the identification and treatment of pollutants.
在此，合成了单原子铌掺杂的硼碳氮纳米管（SANb-BCN），并将其用于制造一种用于检测环境污染物硝基苯（NB）的电化学传感器。通过扫描透射电子显微镜、扫描电子显微镜、透射电子显微镜、X射线衍射分析和拉曼光谱对SANb-BCN进行了表征。修饰在玻碳电极（GCE）上的Nb-BNC材料对NB表现出优异的电化学响应行为。SANb-BCN修饰的GCE（SANb-BCN/GCE）在-0.6 V处产生了一个突出的NB还原峰，该峰相对于裸GCE的NB还原峰正移了120 mV。此外，使用SANb-BCN/GCE获得的NB峰电流（55.74 μA）比使用裸GCE（1.32 μA）时高出近42倍，这表明SANb-BCN/GCE是一种对NB高度敏感的电化学传感器。还实现了超低检测限（0.70 μM，S/N = 3）。此外，发现SANb-BCN/GCE传感器在检测NB期间具有良好的抗干扰能力；因此，包括Mg、Cr、Cu、K、Ca、NH、Cd、尿素、1-溴-4-硝基苯、3-羟基苯甲酸、对苯二甲酸、1-碘-4-硝基苯和甲苯在内的各种有机和无机共存物种的存在对NB检测信号的影响最小。值得注意的是，SANb-BNC传感器材料对环境样品中NB的检测表现出高灵敏度和特异性。因此，使用所提出的传感器将作为识别和处理污染物的有效替代方法。
