Department of Materials Science and Engineering, Hongik University, 2639-Sejong- Ro, Jochiwon-eup, Sejong-city, 30016, Republic of Korea.
Department of Chemistry, Sathyabama Institute of Science and Technology (Deemed to Be University), Chennai, 600119, India.
Chemosphere. 2021 Apr;268:128853. doi: 10.1016/j.chemosphere.2020.128853. Epub 2020 Nov 3.
4- Nitrophenol (4-NP) is a top rated hazardous environmental pollutant and secondary explosive chemicals. For the sake of ecology and environment safety, the catalytic reduction and detection of 4-NP is highly important. In this work, ɤ-FeO-nitrogen doped rGO (ɤ-FeO-N-rGO) nanohydrogel was synthesized by green hydrothermal method. The morphology and phase purity of prepared ɤ-FeO-N-rGO nanohydrogel were confirmed by various analytical (SEM, TEM, XRD, and XPS) and electrochemical techniques. The morphological structure of ɤ-FeO-N-rGO nanohydrogel confirmed that the nanocrystals are well covered over the 2D N-rGO layer. Further, ɤ-FeO-N-rGO nanohydrogel was applied for the catalytic reduction and electrochemical detection of ecotoxic 4-NP. A low cost, ɤ-FeO-N-rGO nanohydrogel displayed an excellent catalytic activity, high recyclability (>5 cycles) and high conversion efficiency of 4-NP to 4-Aminophenol (4-AP). In addition, ɤ-FeO-N-rGO nanohydrogel modified GCE displayed a wide linear sensing range (0.1-1000 μM), and a low detection limit (LOD) of 0.1 μM with excellent sensitivity, high selectivity (<1.2%) and good stability (>4 weeks). The developed sensor electrode shows the low reduction potential of -0.3 V and -0.60 V for the determination of 4-NP. The proposed ɤ-FeO-N-rGO nanohydrogel is promising catalyst for the detection and removal of toxic aromatic nitro compounds in real site applications.
4-硝基苯酚（4-NP）是一种被高度评价的有害环境污染物和二级爆炸物化学品。出于生态和环境安全的考虑，对 4-NP 的催化还原和检测非常重要。在这项工作中，通过绿色水热法合成了ɤ-FeO-氮掺杂 rGO（ɤ-FeO-N-rGO）纳米水凝胶。通过各种分析（SEM、TEM、XRD 和 XPS）和电化学技术证实了所制备的ɤ-FeO-N-rGO 纳米水凝胶的形貌和相纯度。ɤ-FeO-N-rGO 纳米水凝胶的形态结构证实纳米晶很好地覆盖在 2D N-rGO 层上。此外，将 ɤ-FeO-N-rGO 纳米水凝胶用于催化还原和电化学检测有毒的 4-NP。这种低成本的 ɤ-FeO-N-rGO 纳米水凝胶显示出优异的催化活性、高可回收性（>5 次循环）和将 4-NP 高效转化为 4-氨基酚（4-AP）的效率。此外，ɤ-FeO-N-rGO 纳米水凝胶修饰的 GCE 显示出宽的线性传感范围（0.1-1000 μM）和低检测限（LOD）为 0.1 μM，具有出色的灵敏度、高选择性（<1.2%）和良好的稳定性（>4 周）。开发的传感器电极显示出用于测定 4-NP 的低还原电位为-0.3 V 和-0.60 V。该研究提出的 ɤ-FeO-N-rGO 纳米水凝胶有望成为用于实际现场应用中检测和去除有毒芳香硝基化合物的催化剂。
