School of Physics and Materials Science, Shoolini University, Solan, Himachal Pradesh 173229, India; International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University, Solan, 173229, India.
International Research Centre of Nanotechnology for Himalayan Sustainability (IRCNHS), Shoolini University, Solan, 173229, India; College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Nanshan District Key Lab for Biopolymers and Safety Evaluation, Shenzhen University, Shenzhen, 518055, PR China; School of Science & Technology, Glocal University, Saharanpur, India.
Environ Res. 2021 Jun;197:111074. doi: 10.1016/j.envres.2021.111074. Epub 2021 Mar 30.
This work reports synthesis of a dual-function facile heterojunction and investigation of role of the charge transfer dynamism between individual semiconductor components for superior photocatalytic and electrochemical sensing application. The bio-benevolent and sturdy ZnO/FeO heterojunctions were utilized for visible light facilitated photo-degradation of sulfamethoxazole (SMX) antibiotic and electrochemical sensing of dopamine drug (DA). The fabricated heterojunction were characterized for structural, optical, and magnetic properties. Structural studies revealed the formation of nano heterojunction containing both phases. Magnetic studies confirmed the highly pure magnetic nature of photocatalysts. ZnO/30 wt%FeO heterojunction (S2) shows 95.2% SMX degradation under visible light and high retention of performance under solar light. The scavenging experiments infer that OH radicals are the active species responsible for degradation. A Z-scheme photocatalytic mechanism was predicted for higher performance with protection of high potential VB of ZnO and CB of FeO for high generation of reactive oxygen species. LC-MS was employed to predict a plausible degradation route. The sample modified glassy carbon electrodes (GCE) were used for electrochemical sensing of dopamine via cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The S2 junction exhibited 0.18 μM limit of detection with concentration range of 1 μM-50 μM. The stability test was successfully carried out at room temperature for 15 days. In addition, the S2 modified electrodes were spiked in real urine samples and good results were obtained. DPV reveals that S2 modified electrode is best sensor for dopamine sensing among all synthesized heterojunctions. The detection mechanism was also discussed in detail. The in-built metal redox i.e Zn/Zn and Fe/Fe facilitate the Z-scheme transfer, improve the charge transfer capacity and reduce the recombination. This study is beneficial because it reports utilization of popular and well-tested semiconductor metal oxides to form heterojunctions with dual capabilities of environmental detoxification and cost-effective electrochemical detection of biomolecules.
这项工作报道了一种双功能简便异质结的合成，并研究了单个半导体组件之间电荷转移动态在优越光催化和电化学传感应用中的作用。利用生物友好且坚固的 ZnO/FeO 异质结，实现了可见光辅助下磺胺甲恶唑（SMX）抗生素的光降解和多巴胺药物（DA）的电化学传感。所制备的异质结进行了结构、光学和磁性特性的表征。结构研究表明形成了含有两种相的纳米异质结。磁性研究证实了光催化剂具有高度纯净的磁性。ZnO/30wt%FeO 异质结（S2）在可见光下显示出 95.2%的 SMX 降解，在太阳光下性能保持高。淬灭实验推断，OH 自由基是负责降解的活性物质。预测了一种 Z 型光催化机制，用于通过保护 ZnO 的高 VB 和 FeO 的 CB 来提高活性氧物种的生成，从而获得更高的性能。LC-MS 用于预测可能的降解途径。通过循环伏安法（CV）和差分脉冲伏安法（DPV），将修饰玻碳电极（GCE）的样品用于电化学传感多巴胺。S2 结表现出 0.18μM 的检测限，浓度范围为 1μM-50μM。在室温下成功进行了 15 天的稳定性测试。此外，S2 修饰电极在真实尿液样品中进行了加标，并获得了良好的结果。DPV 表明，S2 修饰电极是所有合成异质结中用于多巴胺传感的最佳传感器。还详细讨论了检测机制。内置金属氧化还原即 Zn/Zn 和 Fe/Fe 促进了 Z 型转移，提高了电荷转移能力并减少了复合。这项研究是有益的，因为它报告了利用流行且经过充分测试的半导体金属氧化物形成具有双重功能的异质结，用于环境解毒和具有成本效益的生物分子电化学检测。
