Polyhedron最新文献_第4页

Bidentate/bis-bidentate ligands−contained polymolybdate−based hybrid copper compounds for capacitive performance and catalytic detoxification of sulfur mustard simulant 双齿/双齿配体含多钼酸盐基杂化铜化合物的电容性能和芥子气模拟物的催化解毒性能

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-26 DOI: 10.1016/j.poly.2025.117941

Ji-Sheng Wang, Yi-Ming Li, Yu Bai, Xiang Wang

To exploit polyoxometalate−based inorganic−organic hybrid compounds having potential capacitive and catalytic performances, in this work, 3, 5-bis(1H-imidazol-1-yl)nitrobenzene (BINB) and 1, 3-bis(3-(2-pyridyl)pyrazole)nitrobenzene (BPPNB) were used as bidentate and bis-bidentate organic ligands, and two hybrid copper compounds based on polymolybdates formulated as [Cu(H₂O)₂][Cu(BINB)₂][β-Mo₈O₂₆]·4H₂O (1) and [Cu₄(BPPNB)₂][γ-Mo₈O₂₆]₂·8H₂O (2), were synthesized under hydrothermal conditions and characterized. Two compounds have two−dimensional layer structures. The ring-connected-ring metal-organic chains constructed from bidentate BINB ligands and Cu²⁺ ions gathered Cu/[β-Mo₈O₂₆]⁴⁻ inorganic chains, resulting in a two−dimensional layer of 1. In 2, the [γ-Mo₈O₂₆]⁴⁻ polymolybdates were connected each other in an edge−shared manner, giving a kind of polyoxometalate−based inorganic chains, further linked by bis-bidentate BPPNB ligands via Cu²⁺ ions into a two−dimensional structure. Two compounds as electrode materials exhibited enhanced specific capacitances of 1462 F g⁻¹ for 1, 1530 F g⁻¹ for 2 at a current density of 1 A g⁻¹. Moreover, 1 and 2 were efficient in catalytic detoxification of sulfur mustard simulant 2-chloroethyl ethyl sulfide with satisfying conversion rates and selectivity. These results provided a promising strategy in the exploitation polyoxometalate−based hybrids as capacitor materials and catalysts.

为了开发具有潜在电容和催化性能的多金属氧酸盐基无机-有机杂化化合物，本研究以3,5 -双（h -咪唑-1-基）硝基苯（BINB）和1,3 -双（3-（2-吡啶基）吡唑）硝基苯（BPPNB）为双齿和双齿有机配体，并以两种多钼酸盐为基础的杂化铜化合物配制为[Cu(H2O)2][Cu(BINB)2][β-Mo8O26]·4H2O(1)和[Cu4(BPPNB)2][γ-Mo8O26]2·8H2O(2)。在水热条件下合成并表征。两种化合物具有二维层状结构。由双齿BINB配体和Cu2+离子构建的环连接环金属有机链聚集Cu/[β-Mo8O26]4 -无机链，形成1的二维层。在2中，[γ-Mo8O26]4 -多钼酸盐以共享边的方式相互连接，形成了一种基于多金属氧酸盐的无机链，并通过Cu2+离子进一步由双双齿BPPNB配体连接成二维结构。两种化合物作为电极材料，在电流密度为1 a g−1时，比电容分别为1462 F g−1和1530 F g−1。此外，1和2在芥菜模拟物2-氯乙基乙基硫醚的催化解毒中具有良好的转化率和选择性。这些结果为开发多金属酸氧基杂化材料作为电容器材料和催化剂提供了一条有前途的策略。

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引用次数: 0

Light-driven olefin oxidation using Mn-porphyrin immobilized onto chitosan: A sustainable approach based on green chemistry 壳聚糖固定化锰卟啉光驱烯烃氧化：一种基于绿色化学的可持续方法

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-20 DOI: 10.1016/j.poly.2025.117937

Saeed Rayati, Sona Bajelan

In the present research, photocatalytic behavior of the immobilized meso-tetrakis(4-carboxyphenyl)porphyrinatomanganese(III) acetate (MnTCPP) onto chitosan as support for the heterogeneous oxidation of olefins has been investigated. The heterogenized catalyst characterized using thermogravimetric analysis (TGA), UV–Vis spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), infrared (IR) spectroscopy, and X-ray diffraction pattern (XRD). Under visible-light irradiation, the aerobic oxidation of various olefins facilitated in the presence of MnTCPP@Chitosan. The prepared photocatalyst is notable for its simple synthesis and strong performance in the multiple cycles, achieving a turnover number (TON) of 1200 in the oxidation of cyclohexene. Radical scavenging experiments showed that superoxide anions and hydroxyl radicals (·OH) as the primary reactive species are responsible for the oxidation process. The findings show that MnTCPP@Chitosan is as a green catalyst for efficient olefin oxidation.

本文研究了固定化中四（4-羧基苯基）卟啉锰（III）乙酸酯（MnTCPP）在壳聚糖上作为载体对烯烃非均相氧化的光催化行为。采用热重分析（TGA）、紫外可见光谱（UV-Vis）、场发射扫描电镜（FESEM）、透射电镜（TEM）、红外光谱（IR）和x射线衍射图（XRD）对催化剂进行了表征。在可见光照射下，MnTCPP@Chitosan的存在促进了各种烯烃的好氧氧化。所制备的光催化剂具有合成简单、多次循环性能强的特点，在环己烯氧化过程中，其周转率（TON）可达1200。自由基清除实验表明，超氧阴离子和羟基自由基（·OH）是参与氧化过程的主要活性物质。研究结果表明，MnTCPP@Chitosan是高效氧化烯烃的绿色催化剂。

引用次数: 0

Selective removal of cationic organic dyes from aqueous solution using dendritic fibrous nanosilica 枝状纤维纳米二氧化硅选择性去除水溶液中的阳离子有机染料

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-29 DOI: 10.1016/j.poly.2025.117950

Tau S. Ntelane , Mayetu Segale , Nomcebo H. Mthombeni , Dieketseng Tsotetsi , Mokhotjwa Dhlamini , Usisipho Feleni , Rudzani Sigwadi , Alex T. Kuvarega

Developing novel adsorbents with high selectivity is crucial for the effective adsorption of diverse organic pollutants in wastewater. Dendritic fibrous nanosilica (KCC-1) was synthesized through the hydrothermal method to evaluate the impact of varying silica content (112, 170 and 224 mmol) on its adsorption capacity. The resultant KCC-1 displayed distinctly defined fibres and three-dimensional (3D) center-radial channels, resulting in large pore volumes, exceedingly high specific surface areas, and particularly accessible internal sites, which offer numerous adsorption sites. Experimental results demonstrated that varying silica moles affected particle size and specific textural properties (including surface area and pore volume) to a certain degree, with little impact on the performance. The results indicated that the synthesized KCC-1 using 170 mmol silica source exhibited superior efficiency for the selective adsorption of cationic dyes (rhodamine B and methylene blue) compared to anionic dyes (methyl orange and tartrazine) at pH 7.0. The maximum adsorption capacities for rhodamine B and methylene blue, according to the Langmuir isotherm model, were found to be 124.5 mg/g and 117.4 mg/g, respectively. The pronounced adsorption affinity for cationic dyes was attributed to the robust electrostatic interactions that occur between the adsorbent and the adsorbates. This study elucidates the extent to which reaction parameters influence the performance of KCC-1, given that their physicochemical properties are contingent with methodology and reaction parameters. The KCC-1 exhibits a remarkable ability to selectively remove dyes, indicating significant potential for the separation and recovery of dyes from real wastewater.

开发高选择性新型吸附剂是有效吸附废水中多种有机污染物的关键。采用水热法合成了树状纤维纳米二氧化硅（KCC-1），考察了不同二氧化硅含量（112、170和224 mmol）对其吸附能力的影响。所得到的KCC-1显示出清晰的纤维和三维（3D）中心-径向通道，从而产生大孔隙体积，极高的比表面积，特别是可访问的内部位点，提供了许多吸附位点。实验结果表明，不同的二氧化硅摩尔数会在一定程度上影响颗粒尺寸和比构性能（包括比表面积和孔体积），但对性能影响不大。结果表明，在pH 7.0条件下，170 mmol二氧化硅源合成的KCC-1对阳离子染料（罗丹明B和亚甲基蓝）的选择性吸附效果优于阴离子染料（甲基橙和酒黄）。根据Langmuir等温模型，对罗丹明B和亚甲基蓝的最大吸附量分别为124.5 mg/g和117.4 mg/g。对阳离子染料的明显吸附亲和性归因于吸附剂和吸附剂之间发生的强大的静电相互作用。本研究阐明了反应参数对KCC-1性能的影响程度，因为它们的物理化学性质取决于方法和反应参数。KCC-1表现出显著的选择性去除染料的能力，表明其在实际废水中染料的分离和回收方面具有巨大的潜力。

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引用次数: 0

Synthesis and characterization of Schiff-base Chemosensor for spectroscopic and colorimetric selective recognition of Cu2+ in semi-aqueous medium 半水介质中选择性识别Cu2+的希夫碱化学传感器的合成与表征

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-18 DOI: 10.1016/j.poly.2025.117930

Ranjana Aggarwal , Prince Kumar , Garima Sumran , Mona Hooda , Ashwani Kumar

A novel (1E,2Z)-2-(((E)-2-hydroxybenzylidene)hydrazono)-1,2-diphenylethan-1-one oxime (HHDO, 4) has been synthesized by condensation reaction of 2-hydrazono-1,2-diphenylethan-1-one oxime (2) and 2-hydroxybenzaldehyde (3) and characterized by FTIR, ¹H NMR, ¹³C NMR and mass spectrum (MS). HHDO displays high selectivity and sensitivity towards Cu²⁺ ions. Sensing property for Cu²⁺ is studied by UV–visible, fluorescence spectrophotometric analyses, along with Job's plot analysis. The result shows that the stoichiometric ratio of the complex formed by HHDO and Cu²⁺ is 1:1. HHDO exhibits an excellent selectivity to Cu²⁺ over other examined metal ions by showing an intense color change from colorless to crimson yellow under visible light. The binding behavior of the ligand towards Cu²⁺ ions is described by the infrared spectrum analysis. In addition, the developed sensing probe HHDO exhibits a limit of detection of 2.66 × 10⁻⁵ M, and a limit of quantitation of 8.89 × 10⁻⁵ M in the linear range 0.75–7.0 × 10⁻⁶ M with a good association affinity of 8.26 × 10⁶ M⁻¹ for Cu²⁺ ions. Additionally, HHDO could be applied as a naked-eye colorimetric kit for Cu²⁺ ions.

以2-腙-1,2-二苯基-1-肟(2)和2-羟基苯甲醛(3)为原料，通过缩合反应合成了一种新型(1E,2Z)-2-(（(E)-2-羟基苄基-1-肟）-1,2-二苯基-1-肟（HHDO, 4），并用FTIR、1H NMR、13C NMR和质谱（MS）对其进行了表征。HHDO对Cu2+离子具有较高的选择性和敏感性。通过紫外可见，荧光分光光度分析以及Job图分析研究了Cu2+的传感特性。结果表明，HHDO与Cu2+形成的络合物的化学计量比为1:1。HHDO对Cu2+具有较好的选择性，在可见光下表现出从无色到深黄色的强烈颜色变化。红外光谱分析描述了该配体对Cu2+离子的结合行为。在0.75 ~ 7.0 × 10−6 M线性范围内，检测限为2.66 × 10−5 M，定量限为8.89 × 10−5 M，对Cu2+离子具有8.26 × 106 M−1的良好缔合亲和力。此外，HHDO可以作为Cu2+离子的裸眼比色试剂盒。

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引用次数: 0

Exploring pyrrole, furan, and thiophene-based Schiff bases for selective cerium (III) ion recognition: Experimental and computational investigation 探索吡咯，呋喃和噻吩基席夫碱选择性铈（III）离子识别：实验和计算研究

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-26 DOI: 10.1016/j.poly.2025.117940

Sonia Balan , Vijay Kumar , Nancy George , Jandeep Singh , Kashmiri Lal

In this study, we report the design and synthesis of a novel heterocycle-based hydrazone accomplished via condensation reaction between chloroquinoline hydrazine and heterocyclic carbaldehyde derivatives and the resulting heterocycle-chloroquinoline hydrazone hybrid Schiff base ligands were successfully characterized using spectral techniques. The hybrid probes exhibited remarkable optical responses, showing high sensitivity, selectivity, and rapid detection ability toward Ce³⁺ ions as studied through UV–visible and fluorescence titration experiments. The probes 3a–3c exhibited low limits of detection (LOD) for Ce(III) established as 6.14 nM, 7.57 nM, 8.57 nM and good binding constant found to be 5.91 × 10⁴ M⁻¹, 1.40 × 10⁴ M⁻¹, and 2.39 × 10⁴ M⁻¹, respectively. The stoichiometric ratio was estimated as (1:1) ratio for metal-ligand complex by Job plot analysis. The DFT calculations were performed using B3LYP/6-311G++(d,p) for free probes and B3LYP/SDD for corresponding metal complexes to provide insights into binding interactions. The integrated experimental and theoretical findings formulate a reliable and precise detection framework for the detection of Ce(III) ions, having potential applications in ecological monitoring and analytical chemistry.

在本研究中，我们通过氯喹啉肼和杂环乙醛衍生物的缩合反应设计合成了一种新型杂环腙，并利用光谱技术成功地表征了杂环-氯喹啉腙杂化希夫碱配体。通过紫外可见和荧光滴定实验研究表明，该杂化探针对Ce3+离子具有较高的灵敏度、选择性和快速检测能力。探针3a-3c对Ce（III）的低检出限（LOD）分别为6.14 nM、7.57 nM和8.57 nM，良好的结合常数分别为5.91 × 104 M−1、1.40 × 104 M−1和2.39 × 104 M−1。通过Job plot分析法估计金属-配体配合物的化学计量比为（1:1）。DFT计算使用B3LYP/6- 311g++ (d,p)表示自由探针，B3LYP/SDD表示相应的金属配合物，以深入了解结合相互作用。综合实验和理论研究结果为Ce（III）离子的检测提供了可靠、精确的检测框架，在生态监测和分析化学中具有潜在的应用前景。

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引用次数: 0

Stereoselective synthesis and redox properties of ferrocene-substituted pyrrolidines via [3+2] cycloaddition [3+2]环加成法合成二茂铁取代吡咯烷的立体选择性及氧化还原性能

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-30 DOI: 10.1016/j.poly.2025.117951

Marko Pešić , Jovana Bugarinović , Slađana B. Novaković , Goran A. Bogdanović , Anka Todosijević , Dragana Stevanović , Ivan Damljanović

A new series of ferrocene-containing pyrrolidine derivatives was synthesized through a [3+2] dipolar cycloaddition of azomethine ylides with 1-ferrocenyl-2-nitroethene. Under mild conditions and in the presence of silver acetate and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU), the reaction was performed repeatedly to afford six novel compounds in moderate to good yields. Structural elucidation was achieved by NMR and IR, while single-crystal X-ray diffraction of two representative compounds unambiguously confirmed the stereochemical outcome and spatial orientation of the substituents. The stereochemical preferences were rationalized by charge distribution, steric effects of the bulky ferrocene group, and secondary orbital interactions, consistent with an endo reaction pathway. According to X-ray analysis, all five substituents of the pyrrolidine ring are involved in intermolecular interactions, while a double chain composed solely of ferrocenyl units appears as the most prominent structural feature. The non-covalent interactions were analyzed based on interaction energy. Electrochemical properties were examined by cyclic voltammetry (CV), which revealed a reversible one-electron redox process. The anodic peak potentials were shifted relative to ferrocene, reflecting the influence of electron-withdrawing nitro substituents. These findings highlight the dual synthetic and biological relevance of ferrocenyl pyrrolidines as redox-active scaffolds with antioxidant potential.

通过偶氮亚甲基与1-二茂铁-2-硝基乙烯的[3+2]偶极环加成反应，合成了一系列新的含二茂铁吡咯烷衍生物。在温和的条件下，在乙酸银和1,8-重氮双环[5.4.0]十一-7-烯（DBU）存在的情况下，重复进行该反应，得到了六种中高收率的新化合物。通过核磁共振和红外光谱进行了结构解析，而两个代表性化合物的单晶x射线衍射明确地证实了取代基的立体化学结果和空间取向。电荷分布、大体积二茂铁基团的空间效应和二级轨道相互作用使立体化学偏好合理化，与内切反应途径一致。x射线分析表明，吡咯烷环上的5个取代基均参与分子间相互作用，而二茂铁基单元组成的双链是其最显著的结构特征。基于相互作用能对非共价相互作用进行了分析。通过循环伏安法（CV）对其电化学性能进行了测试，结果表明这是一个可逆的单电子氧化还原过程。阳极峰电位相对于二茂铁发生了位移，反映了吸电子硝基取代基的影响。这些发现突出了二茂铁基吡咯烷作为具有氧化还原活性的具有抗氧化潜力的支架的双重合成和生物学意义。

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引用次数: 0

Supramolecular crown ether-Keggin polyoxometalate assembly: synthesis, structure, and electrocatalytic activities 超分子冠醚- keggin多金属氧酸组装：合成、结构和电催化活性

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-18 DOI: 10.1016/j.poly.2025.117934

Yong Liu , Hongxu Zhang , Zitong Wang , Zonish Zeb , Huayan Zhang , Qiqi Zhang , Yi Liu , Xinyuan Jiang , Mengyao Wang , Lu-Nan Zhang , Yongge Wei , Lubin Ni

A novel supramolecular hybrid, [K(H₂₄C₁₂O₆)]₂[K((H₂₄C₁₂O₆)(CH₃CN)₂)][PMo₁₂O₄₀] (PMo₁₂@Crown), was synthesized in acetonitrile and thoroughly characterized. The crystal structure reveals a unique host–guest system stabilized by hydrogen bonding and other intermolecular interactions between a Keggin-type [PMo₁₂O₄₀]³⁻ polyanion and three 18-crown-6 macrocycles. Furthermore, the complex demonstrates multifunctional electrocatalytic activity, demonstrating a low overpotential of 136 mV at 10 mA·cm⁻² for the hydrogen evolution reaction (HER) and achieving a high nitrite reduction efficiency of 96 %.

在乙腈中合成了一种新型超分子杂化物[K(H24C12O6)]2[K((H24C12O6)(CH3CN)2)][PMo12O40] (PMo12@Crown)，并对其进行了表征。晶体结构揭示了keggin型[PMo12O40]3−聚阴离子与3个18冠-6大环之间的氢键和其他分子间相互作用所稳定的独特主客体体系。此外，该配合物还显示出多功能电催化活性，在10 mA·cm−2下，析氢反应（HER）的过电位为136 mV，亚硝酸盐还原效率高达96%。

引用次数: 0

Hydrothermally fabricated innovative MgCrO4/rGO composite for supercapacitor activities 用于超级电容器活性的新型水热制备MgCrO4/rGO复合材料

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-24 DOI: 10.1016/j.poly.2025.117939

Zarghuna Firdous , Haifa A. Alyousef , B.M. Alotaibi , Albandari.W. Alrowaily , Hala M. Abo-Dief , Ahmed Hussain Jawhari , Abhinav Kumar

In recent decades, research community has experienced a pronounced emphasis on adjustable nanostructured materials for supercapacitors, influenced by the increasing demand for eco-friendly energy sources. To address these challenges via enhancement of electrode constituents, metal oxide-based rGO nanocomposites have exhibited considerable potential in multiple domains, including energy conversion and storage. The current research encompasses the fabrication of MgCrO₄/rGO nanohybrid as capacitive material using straightforward hydrothermal method, which yields good morphological and structural properties, as confirmed by various physiochemical and electrochemical techniques. Electrochemical nature of produced nanocomposite is assessed within confined potential window of 0.0–0.6 V vs. Ag/AgCl in 2 M of alkaline medium (KOH). Meanwhile, electrochemical results suggested that specific capacitance (C_s) of MgCrO₄/rGO nanocomposite was examined to 1415 F/g @ 1 A/g. Significant C_s of MgCrO₄/rGO corresponds to crystal size, increased surface area (SA) of rGO and synergistic impact produced by MgCrO₄ and rGO. Furthermore, energy density (44.3 Wh/kg) as well as power density (237.5 W/kg @ 1 A/g) was exhibited by nanocomposite. Additionally, collected results revealed significant effectiveness of ion transport efficiency due to small solution resistance (R_s = 0.90 Ω) at MgCrO₄/rGO interface. Diverse stability tests demonstrated that MgCrO₄/rGO displayed stable performance over 50 h with strong structure integrity after 3000^th cycles. Our outcomes demonstrate that synthesized nanohybrid exhibited remarkable electrochemical functionality and holds great potential for addressing future energy-related challenges.

近几十年来，受环保能源需求增长的影响，研究领域对超级电容器的可调纳米结构材料有了明显的重视。为了通过增强电极成分来解决这些挑战，金属氧化物基氧化石墨烯纳米复合材料在包括能量转换和存储在内的多个领域显示出相当大的潜力。目前的研究包括使用简单的水热法制备MgCrO4/rGO纳米杂化材料作为电容材料，该材料具有良好的形态和结构性能，并得到了各种物理化学和电化学技术的证实。在2 M碱性介质（KOH）中，对制备的纳米复合材料的电化学性质进行了评价，限定电位窗口为0.0-0.6 V vs. Ag/AgCl。同时，电化学结果表明，MgCrO4/rGO纳米复合材料的比电容（Cs）为1415 F/g @ 1 A/g。MgCrO4/rGO的显著Cs与晶体尺寸、增大的rGO表面积（SA）以及MgCrO4和rGO产生的协同影响相对应。此外，纳米复合材料的能量密度为44.3 Wh/kg，功率密度为237.5 W/kg @ 1 A/g。此外，收集的结果表明，由于MgCrO4/rGO界面的溶液阻力小（Rs = 0.90 Ω），离子传输效率显著提高。多种稳定性测试表明，经过3000次循环后，MgCrO4/rGO在50 h内表现出稳定的性能，结构完整性强。我们的研究结果表明，合成的纳米杂化材料具有显著的电化学功能，在解决未来能源相关挑战方面具有巨大的潜力。

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引用次数: 0

Efficient adsorption of rhodamine-B using Fe-based metal-organic frameworks: kinetics and isotherms study 铁基金属有机骨架对罗丹明b的高效吸附：动力学和等温线研究

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-15 Epub Date: 2025-12-22 DOI: 10.1016/j.poly.2025.117938

Avadhut V. Kardile , Prateek V. Sawant , Mahadev A. Parekar , Ajay N. Kawade , Haribhau M. Borate , Mansur H. Moulavi , Saiprakash Rout , Dipak Kumar Sahoo , Latesh K. Nikam , Ravindra U. Mene

This study presents a sustainable strategy for removing dyes from wastewater, focusing on iron-based metal-organic framework (Fe-MOF) synthesized through a solvothermal process. These Fe-MOF were employed for the adsorptive removal of Rhodamine-B from aqueous solutions. The structural, optical, morphological, and thermal characteristics of the materials were thoroughly analyzed using X-ray diffraction, UV–visible diffuse reflectance spectroscopy, Fourier-transform infrared spectroscopy, Field emission scanning electron microscopy, Brunauer–Emmett–Teller surface area analysis, and Thermogravimetric analysis. The batch adsorption method was used to examine factors influencing the adsorption process, including initial dye concentration, adsorbent dosage, and contact time. Various adsorption isotherms, including Langmuir, Freundlich, and Temkin models, were tested to identify the best fit for the RhB-Fe-MOF system. Additionally, the adsorption kinetics were analyzed using models such as pseudo-first-order (PFO), pseudo-second-order (PSO), Avrami, Interparticle Diffusion, and Boyd models. The Langmuir isotherm model revealed a maximum adsorption capacity of 251.86 mg/g, while kinetic studies indicated a strong correlation with PFO, PSO, and Avrami models based on R² values. Furthermore, Weber-Morris and Boyd kinetic plots suggested that film diffusion was the rate-limiting step in the process. Moreover, the catalyst remains efficient after five cycles, demonstrating its reusability. Overall, the results highlight the promising potential of Fe-MOFs as efficient and sustainable adsorbents for treating dye-contaminated industrial wastewater.

本研究提出了一种可持续去除废水中染料的策略，重点研究了通过溶剂热法合成的铁基金属有机骨架（Fe-MOF）。这些Fe-MOF用于吸附去除水溶液中的罗丹明- b。利用x射线衍射、紫外-可见漫反射光谱、傅里叶变换红外光谱、场发射扫描电镜、布鲁诺尔-埃米特-泰勒表面积分析和热重分析对材料的结构、光学、形态和热特性进行了全面分析。采用间歇吸附法考察了染料初始浓度、吸附剂用量、接触时间等因素对吸附过程的影响。各种吸附等温线，包括Langmuir， Freundlich和Temkin模型，被测试以确定最适合RhB-Fe-MOF体系。此外，采用伪一阶（PFO）、伪二阶（PSO）、Avrami、粒子间扩散和Boyd模型等模型分析了吸附动力学。Langmuir等温模型的最大吸附量为251.86 mg/g，动力学研究表明，基于R2值的PFO、PSO和Avrami模型与吸附量有很强的相关性。此外，Weber-Morris和Boyd的动力学图表明，薄膜扩散是这一过程中的限速步骤。此外，该催化剂在5次循环后仍然有效，表明其可重复使用。总的来说，这些结果突出了Fe-MOFs作为处理染料污染工业废水的高效和可持续吸附剂的潜力。

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引用次数: 0

Effect of lignin-functionalized magnetite nanoparticles on the behavior of candy propellant: A thermal analysis approach using DSC, TGA, and DTG 木质素功能化磁铁矿纳米颗粒对糖果推进剂行为的影响：使用DSC， TGA和DTG的热分析方法

IF 2.6 3区化学 Q2 CHEMISTRY, INORGANIC & NUCLEAR

Polyhedron

Pub Date : 2026-02-01 Epub Date: 2025-12-15 DOI: 10.1016/j.poly.2025.117936

Yuvaraja Dibdalli , Héctor Pérez , Bastián Villarroel , Nicolás Sepulveda , Alejandro López-Telgie , Desmond MacLeod-Carey , Teresa Poblete , Daniela Millán , Matías Palma , Sebastián Sanchez , José Gaete , Gabriel Abarca , Cesar Morales-Verdejo

The development of efficient and sustainable catalysts for solid propellants remains a challenge due to the trade-off between energetic performance and environmental compatibility. In this work, lignin-functionalized magnetite nanoparticles (Fe₃O₄@Lig) were synthesized via a co-precipitation and oxidative functionalization route and evaluated as catalytic additives for the thermal decomposition of potassium nitrate (KNO₃) and a sorbitol-based “candy” propellant (KNO₃/SB). The structural and magnetic characterization (Transmission Electron Microscopy (TEM), Thermogravimetric Analysis (TGA), Fourier Transform Infrared Spectroscopy (FT-IR), and Vibrating Sample Magnetometry (VSM)) confirmed successful lignin grafting, with an average particle size of 6.4 ± 1.2 nm and superparamagnetic behavior (M_s = 36 emu g⁻¹). TGA and differential scanning calorimetry (DSC) revealed that Fe₃O₄@Lig decreased the KNO₃ decomposition temperature by up to 37 °C and reduced the activation energy from 202 to 159 kJ mol⁻¹. In KNO₃/SB formulations, the additive lowered the main decomposition temperature from 365 to 276 °C and increased the total heat release from 614 to 1453 J g⁻¹. The synergistic effect between the Fe₃O₄ core and lignin shell enhances electron transfer and thermal conductivity during oxidation, promoting faster and more energetic combustion. These findings position Fe₃O₄@Lig as a promising, low-cost, and bio-derived catalyst for improving the combustion efficiency of environmentally benign solid propellants.

由于在能量性能和环境兼容性之间的权衡，开发高效和可持续的固体推进剂催化剂仍然是一个挑战。本文通过共沉淀法和氧化功能化法合成了木质素功能化的磁铁矿纳米颗粒（Fe3O4@Lig），并对其作为硝酸钾（KNO3）和山糖醇基“糖果”推进剂（KNO3/SB）热分解的催化添加剂进行了评价。结构和磁性表征（透射电子显微镜（TEM），热重分析（TGA），傅里叶变换红外光谱（FT-IR）和振动样品磁强分析（VSM））证实木质素接枝成功，平均粒径为6.4±1.2 nm，超顺磁行为（Ms = 36 emu g−1）。热重分析和差示扫描量热法（DSC）结果表明，Fe3O4@Lig使KNO3的分解温度降低了37℃，使活化能从202降低到159 kJ mol−1。在KNO3/SB配方中，该添加剂将主分解温度从365℃降低到276℃，使总放热从614 J g−1增加到1453 J g−1。Fe3O4芯和木质素壳之间的协同作用增强了氧化过程中的电子传递和导热性，促进了更快、更有活力的燃烧。这些发现将Fe3O4@Lig定位为一种有前途的、低成本的、生物衍生的催化剂，用于提高环境友好型固体推进剂的燃烧效率。

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引用次数: 0