4-硝基苯酚
高分辨率透射电子显微镜
材料科学
纳米复合材料
X射线光电子能谱
碳纳米管
纳米颗粒
催化作用
化学工程
硝基苯酚
傅里叶变换红外光谱
胶体金
反应速率常数
纳米技术
电化学
检出限
核化学
电极
化学
动力学
透射电子显微镜
有机化学
色谱法
物理化学
工程类
物理
量子力学
作者
Abdullah A. Al‐Kahtani,Turki Almuqati,Norah Alhokbany,Tansir Ahamad,Mu. Naushad,Saad M. Alshehri
标识
DOI:10.1016/j.jclepro.2018.04.197
摘要
4-Nitrophenol (4-NP) has become anthropogenic pollutant and poses a threat to the environment and human health. The fast detection and reduction of 4-NP can reduced their environmental and health issues. In this study, we have prepared the spherical shaped gold nanoparticles (AuNPs) decorated multi-walled carbon nanotubes (MWCNTs) in the hydrogel matrix. The prepared nanocomposite ([email protected]) was characterized successfully by several analytical techniques such as FTIR, Ramman, UV–visible spectra, XRD, XPS, and TEM. The surface of MWCNTs was decorated with AuNPs with the diameters range between 10 and 35 nm, the HRTEM results show 2.36 Å interlayer spacing corresponding to (111) crystal planes. The prepared nanocomposite was used as an electrochemical detector in the detection of 4-nitrophenol (4-NP). A large reduction peak was observed at −0.56 V corresponding to the reduction of 4-NP toward p-hydroxyaminophenol using 4 e− processes, additionally two peaks were observed at 0.13 V and 0.19 V corresponding to the redox behavior p-hydroxyaminophenol and p-nitrosophenol. It was clearly observed, that the [email protected] electrode detects at low concentration range with high sensitivity. Moreover, [email protected] was also used as a catalyst for the reduction 4-NP to 4-AP (4-aminophenol) using NaBH4 via pseudo-first-order and the rate constant was found to be 4.9 × 10−3 s−1 supporting the promising reduction of 4-NP.
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