Microwave-assisted facile synthesis of MnO2-rGO nanocomposite as electrochemical sensor for the detection of mercury and lead (II) ions

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS

Diamond and Related Materials Pub Date : 2025-04-10 DOI:10.1016/j.diamond.2025.112299

Ritesh Kumar , Ritika Sharma , Diksha , A.L. Sharma , Rajesh K. Singh , Dilbag Singh

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Abstract

Lead (Pb²⁺) and mercury (Hg²⁺) ions are among the most hazardous heavy metals used in industrial processes, yet their utilization remains essential and irreplaceable. As a result, there is an urgent and critical need to develop advanced, efficient sensors capable of accurately monitoring industrial waste emissions containing these toxic metals. This study reports the synthesis and characterization of a MnO₂-reduced graphene oxide (MnO₂-rGO) nanocomposite for the sensitive and selective detection of lead (Pb²⁺) and mercury (Hg²⁺) ions in wastewater. The MnO₂ was synthesized using the hydrothermal method while the nanocomposite was synthesized utilizing a microwave after mixing MnO₂ and GO. The structural and morphological features of the nanocomposite were confirmed through X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HR-TEM) whereas, the functional groups were identified by Fourier-transform infrared spectroscopy (FTIR). The as-synthesized MnO₂-rGO nanocomposite is then utilized for the electrochemical detection of these heavy metal ions using differential pulse anodic stripping voltammetry. Compared to its precursor materials (MnO₂ and GO), the MnO₂-rGO nanocomposite exhibited enhanced performance in detecting Pb²⁺ and Hg²⁺ ions. The MnO₂-rGO nanocomposite showed high sensitivity and selectivity, with detection limits of 6.08 μM for lead ions and 7.04 μM for mercury ions. The nanocomposite's remarkable performance underscores its potential as a powerful tool for precise and efficient heavy metal ion detection, paving the way for significant advancements in water quality monitoring and environmental protection.

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微波辅助制备MnO2-rGO纳米复合材料检测汞和铅（II）离子的电化学传感器

铅（Pb2+）和汞（Hg2+）离子是工业过程中使用的最危险的重金属，但它们的利用仍然是必不可少的和不可替代的。因此，迫切需要开发先进、高效的传感器，能够准确监测含有这些有毒金属的工业废物排放。本研究报道了mno2还原氧化石墨烯（MnO2-rGO）纳米复合材料的合成和表征，该复合材料用于敏感和选择性检测废水中的铅（Pb2+）和汞（Hg2+）离子。MnO2采用水热法合成，MnO2与GO混合后采用微波法制备纳米复合材料。通过x射线衍射（XRD）、拉曼光谱（Raman spectroscopy）、场发射扫描电镜（FESEM）和高分辨率透射电镜（HR-TEM）对纳米复合材料的结构和形态特征进行了表征，并用傅里叶变换红外光谱（FTIR）对其官能团进行了鉴定。然后利用差分脉冲阳极溶出伏安法将合成的二氧化锰-氧化石墨烯纳米复合材料用于这些重金属离子的电化学检测。与前驱体材料（MnO2和GO）相比，MnO2- rgo纳米复合材料在检测Pb2+和Hg2+离子方面表现出更强的性能。MnO2-rGO纳米复合材料对铅离子和汞离子的检出限分别为6.08 μM和7.04 μM，具有较高的灵敏度和选择性。纳米复合材料的卓越性能凸显了其作为精确高效重金属离子检测的强大工具的潜力，为水质监测和环境保护的重大进步铺平了道路。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.