High-efficiency photocatalyst based on bis(dimethylglyoximato)nickel(II) complex and Fe3O4 (magnetite) nanoparticles for rapid degradation of toxic dyes in aqueous medium

IF 4.7 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Structure Pub Date : 2025-09-29 DOI:10.1016/j.molstruc.2025.144207

Rahman Saeed , Tanveer ul Haq Zia , Wei Sun , Paulo Sérgio Taube , Mansoor Ahmad , Kashif Gul , Behisht Ara

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引用次数: 0

Abstract

The discharge of toxic dyes like methylene blue (MB) and nigrosin black (NB) from industrial effluents poses a severe environmental threat. While photocatalysis is a promising solution, developing efficient and environmentally benign catalyst remains a significant challenge. In order to address it, a mesoporous metal-organic framework (MOF) heterostructured composite is prepared through the functionalization of bis(dimethylglyoximato)nickel(II) complex microrods with magnetite Fe₃O₄ nanoparticles. SEM analysis depicts large (0.2–1.0 μm), well-defined facets with sharp, terraced steps on these parallel structures apparent as semi-nano rods of [Ni(DMG)₂] complex. Spherical Fe₃O₄ nanoparticles (50–100 nm in diameter) were immobilized on the surface of the [Ni(DMG)₂] microrods. Fe₃O₄ nanoparticles exhibited crystallite sizes of 20–50 nm, while the [Ni(DMG)₂] microrods displayed a semi-crystalline periphery with finer crystallites of 1–2 nm. XRD validated retention of spinel Fe₃O₄ and [Ni(DMG)₂] crystallinity, and DRS showed a reduced bandgap of 1.45 eV as compared to 2.13 eV for pure Fe₃O₄ due to enhanced visible-light absorption by organic complex. The mesoporous structure of [Ni(DMG)₂]-Fe₃O₄-MOF have a surface area of 18.09m²/g was confirmed with BET. The composite demonstrated exceptional photocatalytic performance under visible light, achieving 95 % degradation of MB within 30 min and 91 % degradation of NB within 50 min using minimal catalyst doses of 0.05 g and 0.06 g, respectively. Kinetic studies adhered to a pseudo-second-order model, and mineralization was confirmed by the 89 % reduction from 1800 mg/L to 200 mg/L after 90 min in chemical oxygen demand (COD). This work establishes that the [Ni(DMG)₂]-Fe₃O₄-MOF composite is a highly efficient, reusable, and practical photocatalyst for sustainable wastewater treatment.

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基于双（二甲基乙氧嘧啶）镍（II）配合物和Fe3O4（磁铁矿）纳米颗粒的高效光催化剂在水中快速降解有毒染料

工业废水中亚甲基蓝（MB）和黑素黑（NB）等有毒染料的排放对环境构成严重威胁。虽然光催化是一个很有前途的解决方案，但开发高效环保的催化剂仍然是一个重大挑战。为了解决这一问题，采用磁性纳米Fe3O4将二（二甲基乙氧基肟）镍（II）复合微棒功能化，制备了介孔金属-有机框架（MOF）异质结构复合材料。扫描电镜分析显示，这些平行结构上有大的（0.2-1.0 μm）、清晰的刻面，上面有锋利的阶梯状台阶，看起来像半纳米棒的[Ni(DMG)2]配合物。将球形Fe3O4纳米颗粒（直径50 ~ 100 nm）固定在[Ni(DMG) 2]微棒表面。Fe3O4纳米颗粒的晶粒尺寸为20 ~ 50 nm，而[Ni(DMG)2]微棒的晶粒尺寸为1 ~ 2 nm，呈半晶状。XRD验证了尖晶石Fe3O4和[Ni(DMG)2]结晶度的保留，由于有机配合物增强了对可见光的吸收，DRS的带隙比纯Fe3O4的带隙减小了1.45 eV，而纯Fe3O4的带隙为2.13 eV。BET证实了[Ni(DMG)2]-Fe3O4-MOF的介孔结构，其比表面积为18.09m2/g。该复合材料在可见光下表现出优异的光催化性能，在最小催化剂剂量分别为0.05 g和0.06 g的情况下，在30分钟内对MB的降解率达到95%，在50分钟内对NB的降解率达到91%。动力学研究符合伪二阶模型，90 min后化学需氧量（COD）从1800 mg/L降至200 mg/L，降低89%，证实了矿化作用。研究表明，[Ni(DMG)2]-Fe3O4-MOF复合材料是一种高效、可重复使用、实用的可持续废水处理光催化剂。

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来源期刊

Journal of Molecular Structure 化学-物理化学

CiteScore

7.10

自引率

15.80%

发文量

2384

审稿时长

45 days

期刊介绍： The Journal of Molecular Structure is dedicated to the publication of full-length articles and review papers, providing important new structural information on all types of chemical species including: • Stable and unstable molecules in all types of environments (vapour, molecular beam, liquid, solution, liquid crystal, solid state, matrix-isolated, surface-absorbed etc.) • Chemical intermediates • Molecules in excited states • Biological molecules • Polymers. The methods used may include any combination of spectroscopic and non-spectroscopic techniques, for example: • Infrared spectroscopy (mid, far, near) • Raman spectroscopy and non-linear Raman methods (CARS, etc.) • Electronic absorption spectroscopy • Optical rotatory dispersion and circular dichroism • Fluorescence and phosphorescence techniques • Electron spectroscopies (PES, XPS), EXAFS, etc. • Microwave spectroscopy • Electron diffraction • NMR and ESR spectroscopies • Mössbauer spectroscopy • X-ray crystallography • Charge Density Analyses • Computational Studies (supplementing experimental methods) We encourage publications combining theoretical and experimental approaches. The structural insights gained by the studies should be correlated with the properties, activity and/ or reactivity of the molecule under investigation and the relevance of this molecule and its implications should be discussed.