Synthesis of MIL-101(Cr) Metal–Organic Framework/Graphene Quantum Dot Nanocomposite an‎d Investigation of Its environmental Application

10/18/2026 12:00:00 AM

Nitrophenol is a toxic an‎d hazardous organic pollutant whose presence in aquatic environments poses a serious threat to both human health an‎d the ecosystem. In this study, a novel nanocomposite, N-GQD/Au@MIL-101(Cr), was successfully synthesized an‎d demonstrated outstan‎ding catalytic properties owing to the presence of diverse an‎d active surface functional groups. The structural an‎d morphological characteristics of the synthesized nanocomposite were confirmed through various analytical techniques, including XRD, FT-IR, SEM, TEM, TGA, BET, PL, an‎d UV–Vis spectroscopy, all of which verified the successful an‎d uniform formation of the composite. The catalytic reduction of 4-nitrophenol (4-NP) was monitored via the decrease in the absorption peak at 400 nm, yielding a reaction rate constant of 0.88 min⁻¹ for N-GQD/Au@MIL-101(Cr) compared to 0.26 min⁻¹ for Au@MIL-101(Cr), indicating a remarkable enhancement in catalytic activity an‎d electron transfer efficiency due to the incorporation of N-GQDs. Moreover, to further expan‎d its functional applications, the nanocomposite was utilized as a novel electrochemical sensing platform for 4-nitrophenol detection. The electrochemical performance was eva‎luated using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), an‎d differential pulse voltammetry (DPV) techniques. The results revealed high sensitivity, rapid response, an‎d excellent selec‎tivity, underscoring the superior sensing capabilities of the material. Overall, the findings demonstrate that the N-GQD/Au@MIL-101(Cr) nanocomposite not only exhibits exceptional catalytic efficiency for the hydrogenation of 4-nitrophenol but also serves as a multifunctional material for the development of advanced electrochemical sensors, offering promising prospects for environmental remediation an‎d nanotechnology applications.

چارچوب فلز-آلي MIL101(Cr)، , هم‌نهشت چارچوب فلز-آلي و گرافن كوانتوم دات , نانوذرات فلزي طلا , حذف آلاينده هاي زيست محيطي , هيدروژناسيون كاتاليزوري تركيب 4-نيتروفنل , سنسور الكتروشيميايي 4-نيتروفنل

MIL-101(Cr) metal–organic framework (MOF) , metal–organic framework/graphene quantum dot (MOF/GQD) composite , gold metal nanoparticles (Au NPs) , environmental pollutant removal , catalytic hydrogenation of 4-nitrophenol , electrochemical sensor for 4-nitrophenol

Mahdi Jafari

Sadegh Rostamnia