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Parametric optimization and performance prediction of stainless-steel ER308L cladding on mild steel via gas metal arc welding using RSM 不锈钢ER308L低碳钢气相保护电弧焊包层参数优化及性能预测

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-05 DOI: 10.1016/j.nxmate.2026.101670

Shiv Kumar , Shahnwaz Alam , Gagan Bansal

The study is centered around the optimization of parameters and performance prediction for ER308L stainless steel welding on mild steel substrates using the Gas Metal Arc Welding (GMAW) process. The systematic alterations of the process variables (welding current, arc voltage, and travel speed) accompanied by Response Surface Methodology (RSM) grounded on Central Composite Design (CCD) aim at enhancing not only the surface characteristics but also the strength of the bond. The effect of factors on the critical reactions was determined by clad hardness, tensile strength, and dilution using statistical modeling and analysis of variance (ANOVA). The experimental validation confirmed that the regression models in question were extremely precise, as indicated by the correlation coefficients (R² > 0.97) between predicted and experimental values. The response surface and desirability plots revealed that an ideal heat input condition (moderate current and voltage with controlled travel speed) has led to an enhancement in clad properties—maximum hardness of approximately 360 HV, tensile strength of more than 440 MPa, and dilution of less than 10 % being the lowest. Microstructural examination confirmed the presence of a strong metallurgical bond at the interface which was marked by the presence of small and compact dendritic structures in the clad area and resistance tests showed that the substrate had a better resistance. The optimized sample was found to have a very good combination of mechanical properties and surface quality, thus the use of RSM as a prediction and optimization tool for GMAW cladding was confirmed. This study sets the groundwork for the design of processes and performance prediction in the field of surface engineering applications involving the use of dissimilar metal cladding.

本研究主要围绕ER308L不锈钢在低碳钢基板上采用气体保护焊（GMAW）工艺焊接的参数优化和性能预测展开。基于中心复合设计（CCD）的响应面法（RSM）系统地改变工艺变量（焊接电流、电弧电压和移动速度），不仅可以提高表面特性，还可以提高键合的强度。采用统计模型和方差分析（ANOVA）确定了包层硬度、抗拉强度和稀释度对临界反应的影响。实验验证表明，所建立的回归模型非常精确，预测值与实验值之间的相关系数为R²>； 0.97。响应面和期望图显示，理想的热输入条件（适当的电流和电压，控制行程速度）导致包层性能的增强-最大硬度约为360 HV，抗拉强度大于440 MPa，稀释小于10 %是最低的。显微组织检查证实在界面处存在强大的冶金结合，其标志是在覆层区域存在小而致密的枝晶组织，电阻测试表明基体具有较好的电阻。优化后的样品具有很好的力学性能和表面质量的结合，从而证实了RSM作为GMAW熔覆预测和优化工具的应用。本研究为涉及使用异种金属包层的表面工程应用领域的工艺设计和性能预测奠定了基础。

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引用次数: 0

Impact of precursors on nitrogen doped graphene: A review 前驱体对氮掺杂石墨烯的影响综述

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-02-10 DOI: 10.1016/j.nxmate.2026.101719

S.N. Anyanwu , M. Tamboura , E.A. Gosteva , M.V. Chichkov , A.S. Bykov

Since the discovery of graphene and its potential applications, extensive research has been conducted to improve its performance and expand its utility. Among the strategies explored, defect engineering—specifically the controlled introduction of heteroatoms like nitrogen—has emerged as a crucial approach to customizing graphene's properties. This review examines the role of selected precursor materials in synthesizing nitrogen-doped graphene (NDG), focusing on key factors such as nitrogen configurations (pyridinic, pyrrolic, and graphitic), nitrogen content in the final product, catalytic activity, and surface conductivity. The advantages and limitations of different precursor are analyzed, along with a critical evaluation of synthesis methods, which significantly influence these parameters. By exploring these aspects, this study aims to provide insights for optimizing nitrogen doping processes to advance graphene-based technologies.

自发现石墨烯及其潜在应用以来，人们进行了广泛的研究，以提高其性能并扩大其用途。在探索的策略中，缺陷工程——特别是控制氮等杂原子的引入——已经成为定制石墨烯特性的关键方法。本文综述了所选前驱体材料在合成氮掺杂石墨烯（NDG）中的作用，重点研究了氮的构型（吡啶、吡啶和石墨）、最终产物中的氮含量、催化活性和表面电导率等关键因素。分析了不同前驱体的优点和局限性，并对影响这些参数的合成方法进行了批判性评价。通过对这些方面的探索，本研究旨在为优化氮掺杂工艺以推进石墨烯基技术提供见解。

引用次数: 0

Design and machine learning driven optimization of tunable periodic cross-diamond terahertz metamaterial absorber 可调谐周期交叉金刚石太赫兹超材料吸收器的设计与机器学习驱动优化

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-01-30 DOI: 10.1016/j.nxmate.2026.101673

Pujita Bhatt , Prince Jain , Anand Joshi

A tunable absorber is proposed using a periodic cross-diamond (PCD) resonator array integrated with vanadium dioxide (VO₂) for terahertz applications. Electromagnetic simulations shows absorption peaks at 2.83 THz and 8.28 THz, with a full-width at half-maximum of 7.43 THz, corresponding to a relative absorption bandwidth of 126.7%. The absorption mechanism is analyzed through magnetic and electric field distributions along with parametric analyses are conducted to assess the effect on the absorber’s performance. To improve design optimization and reduce computational cost, regression-based machine learning (ML) models K-Nearest Neighbors, XGBoost, and Random Forest are employed to predict absorptivity across intermediate frequencies. The KNN model achieves excellent performance with an R² of 0.9997 and an MAE of 0.0002, reducing the required CST simulations by nearly 50 % and significantly accelerating the EM design process for terahertz applications.

提出了一种利用二氧化钒（VO2）集成的周期交叉金刚石（PCD）谐振器阵列用于太赫兹应用的可调谐吸收器。电磁模拟结果表明，吸收峰分别位于2.83 THz和8.28 THz处，半峰全宽为7.43 THz，相对吸收带宽为126.7%。通过磁场和电场分布分析了吸收机理，并进行了参数分析，评估了对吸收器性能的影响。为了改进设计优化并降低计算成本，采用基于回归的机器学习（ML）模型K-Nearest Neighbors， XGBoost和Random Forest来预测中频的吸收率。KNN模型实现了出色的性能，R2为0.9997，MAE为0.0002，将所需的CST模拟减少了近50% %，并显著加快了太赫兹应用的EM设计过程。

引用次数: 0

Nitrogen-doped graphene quantum dots for ultrasensitive electrochemical detection of Cu²⁺ ions 氮掺杂石墨烯量子点用于Cu 2 +离子的超灵敏电化学检测

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-01-31 DOI: 10.1016/j.nxmate.2026.101686

Ahmad Dehghanzadeh , Fatemeh Ahour , Esmaeil Habibi

The rational design of highly active and sustainable electrode materials is crucial for next-generation electrochemical monitoring systems. Herein, nitrogen-doped graphene quantum dots (N-GQDs) are introduced as an efficient sensing nanointerface for ultrasensitive Cu²⁺ detection. The N-GQDs were synthesized via a green, one-pot hydrothermal method and electrochemically deposited onto a glassy carbon electrode, ensuring strong interfacial coupling. Nitrogen doping modulates the graphene electronic structure, generating Lewis-basic sites that enhance Cu²⁺ adsorption and interfacial electron transfer. The stripping current of Cu²⁺ was evaluated using differential pulse anodic stripping voltammetry (DPASV) following electrochemical preconcentration. Under optimized conditions, the sensor exhibits high sensitivity with a low detection limit of 0.3 pM and a wide linear range from 1 pM to 10 μM. Excellent selectivity, stability, and reproducibility were achieved, and successful analysis of tap and river water samples with satisfactory recoveries confirms the practical applicability of the proposed platform for environmental monitoring. This study highlights N-GQDs as a scalable, sustainable, and functionally tunable electrode modifier for advanced electrochemical sensing applications.

合理设计高活性和可持续的电极材料对下一代电化学监测系统至关重要。本文引入氮掺杂石墨烯量子点（N-GQDs）作为超灵敏Cu 2 +检测的高效传感纳米界面。N-GQDs通过绿色一锅水热法合成，并电化学沉积在玻碳电极上，确保了强界面耦合。氮掺杂调节了石墨烯的电子结构，产生了lewis碱基，增强了Cu 2 +的吸附和界面电子转移。电化学预富集后，采用差分脉冲阳极溶出伏安法（DPASV）评价Cu 2 +的溶出电流。在优化条件下，传感器具有较高的灵敏度，检测限低至0.3 pM，线性范围为1 pM ~ 10 μM。该方法具有良好的选择性、稳定性和重复性，对自来水和河水样品进行了成功的分析，回收率令人满意，证实了该平台在环境监测中的实际适用性。这项研究强调了N-GQDs作为一种可扩展、可持续和功能可调的电极修饰剂，可用于先进的电化学传感应用。

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引用次数: 0

Structure-property relationships in bio-based polyurethane/carbon nanotube composite coatings revealed by principal component analysis 主成分分析揭示生物基聚氨酯/碳纳米管复合涂层的结构-性能关系

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.nxmate.2026.101665

Muhammad Abdurrahman Munir , David Fernando , Imam Shofid Alaih , Fitria Rahmawati , Abdul Rohman

This study investigates the structural, thermal, morphological, and electrical properties of bio-based polyurethane (PU) composites reinforced with carbon nanotubes (CNTs). PU was synthesized using methylene diphenyl diisocyanate (MDI) and palm kernel oil-derived polyol, while CNTs were incorporated in varying concentrations (1 %, 2 %, 5 %, and 10 %) via a sonication-assisted solution casting method. The chemical structure and successful incorporation of CNTs were confirmed using Fourier Transform Infrared Spectroscopy (FTIR), revealing the preservation of the PU backbone and the presence of non-covalent interactions such as hydrogen bonding. Principal Component Analysis (PCA) of FTIR data demonstrated effective differentiation between PU and PU/CNT composites based on subtle changes in the fingerprint region. Field Emission Scanning Electron Microscopy (FESEM) confirmed a uniform and well-integrated dispersion of CNTs in the PU matrix, with minimal aggregation, supporting effective nanofiller incorporation. Thermal analyses using Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC) revealed that CNTs improved the thermal stability, delayed decomposition onset, and increased residual char content, particularly at 5–10 wt% CNT. These enhancements were attributed to CNTs' barrier effect and high thermal conductivity. Electrochemical Impedance Spectroscopy (EIS) further demonstrated a significant reduction in bulk resistance with increasing CNT concentration, confirming enhanced electrical conductivity and the formation of conductive networks. The PU/CNT composites exhibited characteristic impedance behavior in line with the Randles circuit model, supporting their potential for electrochemical applications. Overall, the results indicate that CNT-reinforced PU composites possess enhanced thermal, structural, and electrochemical properties, making them promising candidates for flexible electronics, electrochemical sensors, and anti-corrosion coatings.

本研究研究了碳纳米管（CNTs）增强生物基聚氨酯（PU）复合材料的结构、热、形态和电学性能。以亚甲基二苯基二异氰酸酯（MDI）和棕榈仁油衍生多元醇为原料合成聚氨酯（PU），同时通过超声辅助溶液浇制法以不同浓度（1 %、2 %、5 %和10 %）掺入CNTs。利用傅里叶变换红外光谱（FTIR）证实了化学结构和碳纳米管的成功结合，揭示了PU主链的保存和非共价相互作用（如氢键）的存在。FTIR数据的主成分分析（PCA）表明，基于指纹区域的细微变化，PU和PU/CNT复合材料可以有效区分。场发射扫描电子显微镜（FESEM）证实了碳纳米管在PU基体中的均匀和良好的分散，具有最小的聚集，支持有效的纳米填料掺入。使用热重分析（TGA）和差示扫描量热法（DSC）进行的热分析表明，CNTs改善了热稳定性，延迟了分解开始，并增加了残余炭含量，特别是在5-10 wt% CNT时。这些增强归因于碳纳米管的阻隔效应和高导热性。电化学阻抗谱（EIS）进一步证明，随着碳纳米管浓度的增加，体积电阻显著降低，证实了导电性的增强和导电网络的形成。PU/CNT复合材料表现出符合Randles电路模型的特征阻抗行为，支持其电化学应用潜力。总的来说，结果表明碳纳米管增强PU复合材料具有增强的热、结构和电化学性能，使其成为柔性电子、电化学传感器和防腐涂层的有希望的候选者。

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引用次数: 0

Ether-based electrolytes for next-generation metal batteries: A nascent frontier in high-energy storage — A review 用于下一代金属电池的乙醚基电解质：高能存储的新兴前沿-综述

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-01-30 DOI: 10.1016/j.nxmate.2026.101648

Sodiq Abiodun Kareem , Olajesu Favor Olanrewaju , Justus Uchenna Anaele , Samuel Olumide Falana , Michael Oluwatosin Bodunrin

Utilizing ether-based electrolytes presents a viable approach for addressing the enduring challenges linked to lithium-metal batteries (LMBs), especially concerning solid-electrolyte interphase (SEI) stabilization and enhancement. By employing a comprehensive methodology involving detailed analysis of SEI formation kinetics, strategic modifications to the anode, and customized electrolyte compositions, we can unlock improved stability, ionic conductivity, and overall superior performance of LMBs. Using in-situ characterization methodologies such as x-ray photoelectron spectroscopy (XPS) is critical for comprehending the complex interplay between electrolyte composition, SEI characteristics, and their consequent effects on the behavior of the full cell. The investigation into innovative surface pre-treatments and electrolyte additives, along with a thorough assessment of their interactions, facilitates the systematic design of SEI layers that enable efficient and reversible lithium cycling. Additionally, thoroughly examining ether-based electrolytes in full-cell configurations, incorporating varied cathode materials and operational parameters is imperative for confirming their long-term cycling stability, safety, efficient charge/discharge processes, and compatibility with high-voltage systems. By amalgamating these research avenues, substantial progress is envisaged in the advancement of next-generation lithium-metal batteries characterized by high energy density, prolonged lifespan, and enhanced safety, thus paving the way for their widespread integration in a myriad of applications spanning from portable electronics to electric automobiles and high charging/discharging energy storage systems. The ongoing exploration of ether-based electrolytes, in conjunction with innovative SEI engineering tactics, signifies a critical stride towards realizing the full potential of this promising energy storage technology.

利用醚基电解质为解决与锂金属电池（lmb）相关的持久挑战提供了一种可行的方法，特别是在固体电解质间相（SEI）的稳定和增强方面。通过采用全面的方法，包括详细分析SEI形成动力学，对阳极进行战略性修改，以及定制电解质成分，我们可以解锁LMBs的稳定性，离子电导率和整体优异性能。使用x射线光电子能谱（XPS）等原位表征方法对于理解电解质成分、SEI特性及其对整个电池行为的影响之间复杂的相互作用至关重要。对创新表面预处理和电解质添加剂的研究，以及对其相互作用的全面评估，有助于SEI层的系统设计，从而实现高效、可逆的锂循环。此外，为了确认其长期循环稳定性、安全性、高效的充放电过程以及与高压系统的兼容性，必须在全电池配置下彻底检查醚基电解质，包括不同的阴极材料和操作参数。通过整合这些研究途径，预计下一代锂金属电池的发展将取得实质性进展，其特点是高能量密度、延长寿命和增强安全性，从而为其在便携式电子产品、电动汽车和高充放电储能系统等众多应用中的广泛集成铺平道路。正在进行的醚基电解质的探索，结合创新的SEI工程策略，标志着实现这一有前途的储能技术的全部潜力的关键一步。

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引用次数: 0

Rare earth doped TiO2 thin film: A review on structural, optical, photocatalytic, magnetic, and electrical properties 稀土掺杂TiO2薄膜：结构、光学、光催化、磁性和电性能的研究进展

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-01-30 DOI: 10.1016/j.nxmate.2026.101661

Saidul Haque, Md. Masud Khan, Md. Sarowar Jahan, Abdul Ahad, Tasnim Alam Sayedi, Md. Irfan Khan, Tasratur Reaj Neha

Rare earth (RE) doping become an effective strategy for enhancing the multifunctional properties of TiO₂ thin films, making them highly suitable for diverse advanced applications. This review explores how different RE dopants, including Cerium (Ce), Europium (Eu), Neodymium (Nd), Lanthanum (La), Erbium (Er), Lutetium (Lu), Yttrium (Y), and Terbium (Tb), affect the optical, structural, photocatalytic, morphological, and electrical behaviors of TiO₂ thin film. At lower doping concentrations and moderate annealing temperatures, TiO₂ typically maintains its anatase phase. However, specific dopants and higher concentrations can lead to phase transitions or a reduction in crystalline size. RE doping enhances photocatalytic activity by narrowing the band gap, improving charge separation, and increasing surface reactivity. Additionally, dopants influence the film's morphology, promoting porosity, refined grain sizes, and the formation of surface defects. The electrical and magnetic properties of TiO₂ thin films are also significantly modified, with improvements in conductivity, dielectric performance, and ferromagnetic behavior attributed to defect engineering and orbital interactions. RE doping is a powerful strategy for modifying the optical landscape of TiO₂ thin films, unlocking new functionalities through atomic-scale modifications. In this review, we discuss how specific dopants affect optical transmittance, shifts in the absorption edge, and the evolution of the band gap through systematic UV-Vis analysis. For instance, dopants like Eu and Lu significantly enhance optical transparency by reducing light scattering and utilizing Burstein–Moss-driven band filling, while Yb and Er lower the band gap, improving visible-light absorption through defect-mediated electronic restructuring. These dopant-induced phenomena not only redefine photon–semiconductor interactions but also establish design principles for next-generation optoelectronic and photocatalytic, spintronic, and sensing platforms based on TiO₂.

稀土（RE）掺杂是提高tio2薄膜多功能性能的有效策略，使其非常适合于各种高级应用。本文综述了铈（Ce）、铕（Eu）、钕（Nd）、镧（La）、铒（Er）、镥（Lu）、钇(Y)和铽（Tb）等稀土掺杂剂对tio2薄膜光学、结构、光催化、形态和电学行为的影响。在较低的掺杂浓度和适当的退火温度下，tio2通常保持其锐钛矿相。然而，特定的掺杂剂和较高的浓度会导致相变或晶体尺寸的减小。稀土掺杂通过缩小带隙、改善电荷分离和提高表面反应活性来增强光催化活性。此外，掺杂剂影响薄膜的形态，促进孔隙度、细化晶粒尺寸和表面缺陷的形成。由于缺陷工程和轨道相互作用，tio2薄膜的电导率、介电性能和铁磁性能也得到了显著改善。稀土掺杂是一种强有力的策略来改变tio2薄膜的光学景观，通过原子尺度的修饰解锁新的功能。在这篇综述中，我们通过系统的UV-Vis分析讨论了特定掺杂剂如何影响光学透过率、吸收边的位移和带隙的演变。例如，Eu和Lu等掺杂剂通过减少光散射和利用burstein - moss驱动的能带填充来显著提高光学透明度，而Yb和Er通过缺陷介导的电子重组来降低带隙，提高可见光吸收。这些掺杂诱导的现象不仅重新定义了光子-半导体相互作用，而且为下一代基于tio2的光电和光催化、自旋电子和传感平台建立了设计原则。

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引用次数: 0

Nonmetal polymeric material triggered threefold character: Conjugated with Sgc8 aptamer, catalytic reduction and cooxidant free oxidation 非金属高分子材料引发的三重特性：与Sgc8适配体共轭、催化还原和无氧化剂氧化

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-01-29 DOI: 10.1016/j.nxmate.2026.101642

Sk Jahir Abbas , Sabina Yesmin

Nonmetal based polymeric materials are considered among the most promising candidates for modern applications. In light of this, we developed a modified polymeric carbon nitride material (NNOCN), which possesses the ability to conjugate with the Sgc8 aptamer, leading to the formation of the bionanomaterial (1⸧). NNOCN material is effective for the catalytic reduction of C3-substituted pyridine nucleotide and for the cooxidant free selective photooxidation of benzyl alcohols. The material was characterized through various analytical techniques, which indicated that it consists of a polymeric, sheet-like structure and is paramagnetic in nature. In contrast, the 1⸧ displayed a spherical morphology with a size range of 65–100 nm. In the catalytic reduction, the products of the substituted pyridine nucleotide moieties (3a and 3b in table S2, entry 2 and 6) were obtained in an excellent yield of 91 %. Furthermore, in the photooxidation reaction, the benzaldehyde products were produced with a high selectivity of 99.6 % and a conversion rate of 60.01 % (Table 1, entry 7).

非金属基高分子材料被认为是现代应用中最有前途的候选者之一。鉴于此，我们开发了一种改性的聚合物氮化碳材料（NNOCN），该材料具有与Sgc8适配体结合的能力，从而形成生物纳米材料（1⸧）。NNOCN材料对c3取代吡啶核苷酸的催化还原和苯甲醇的无氧化剂选择性光氧化都是有效的。通过各种分析技术对该材料进行了表征，表明它由聚合物、片状结构和顺磁性组成。相比之下，1⸧呈现球形形态，尺寸范围为65-100 nm。催化还原得到取代吡啶核苷酸片段（表S2第2项和第6项中的3a和3b）的产物，产率为91% %。此外，在光氧化反应中，苯甲醛产物的选择性为99.6 %，转化率为60.01 %（表1，条目7）。

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引用次数: 0

Impact of relative humidity on the optical properties of sol–gel processed black spinel oxide coatings for solar absorbers 相对湿度对溶胶-凝胶法制备黑尖晶石氧化膜光学性能的影响

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-01-24 DOI: 10.1016/j.nxmate.2026.101643

Federico Turci, Maxime Lagier, Anna Krammer, Andreas Schüler

This study investigates the influence of relative humidity on the sol–gel deposition process of a multilayer black spinel oxide coatings for solar selective absorbers. Changes in humidity conditions during deposition were found to affect porosity, thickness, and optical properties, ultimately influencing the performance and reproducibility of the coatings. Under optimized conditions, we achieved a solar absorptance of 0.95 and a thermal emissivity of 0.16 at 100 °C. When applied to solar tubular receivers, the coatings maintained high performance with 0.95 absorptance and 0.15 emissivity, demonstrating uniformity along the tube. In addition, the aging of the solution and its sensitivity to ambient humidity were also taken into account. The solution remained effective for one week, meeting industrial durability requirements. In general, optimizing relative humidity enables the scalable, efficient, and cost-effective production of coatings for low- to mid-temperature solar applications.

研究了相对湿度对黑色尖晶石氧化物多层膜溶胶-凝胶沉积过程的影响。研究发现，沉积过程中湿度条件的变化会影响孔隙度、厚度和光学性能，最终影响涂层的性能和再现性。在优化的条件下，我们在100°C时获得了0.95的太阳吸收率和0.16的热发射率。当应用于太阳能管状接收器时，涂层保持了0.95的吸收率和0.15的发射率，并表现出沿管的均匀性。此外，还考虑了溶液的老化及其对环境湿度的敏感性。该解决方案在一周内保持有效，满足工业耐用性要求。一般来说，优化相对湿度使低至中温太阳能应用的涂料可扩展，高效和具有成本效益的生产。

引用次数: 0

Mechanisms of molybdenum ions adsorption on gamma nanoalumina: A detailed analysis using kinetics and isotherms with radiotracer techniques 钼离子在纳米氧化铝上的吸附机理：利用动力学和等温线与放射性示踪技术的详细分析

Next Materials

Pub Date : 2026-04-01 Epub Date: 2026-01-12 DOI: 10.1016/j.nxmate.2026.101584

Emily Vivanco-Cuba , Anaís Adauto , Pablo Mendoza

The adsorption of molybdenum ions from aqueous solutions was studied using commercial nanometric particles of gamma aluminum oxide (γ-Al₂O₃) measuring 5 and 80 nm, employing the radiotracer technique, which allowed working with trace concentrations and accurately monitoring the evolution of the species in solution. To characterize the process, kinetic and equilibrium studies were carried out in order to elucidate the adsorption mechanism and determine the maximum capacity. The results showed that the retention of molybdenum ions in γ-Al₂O₃ is rapid, occurring mainly in the first two minutes, and that the temporal evolution is adequately described by the pseudo-second-order model, indicating specific interactions between the molybdate anion and the alumina surface. The 5 nm γ-Al₂O₃ material showed a slightly higher adsorption capacity than the 80 nm γ-Al₂O₃, attributable to its larger specific surface area. According to the isothermal model, the maximum adsorption values (q_m) were 386.95 mg g⁻¹ for γ-Al₂O₃-5 nm and 368.20 mg g⁻¹ for γ-Al₂O₃-80 nm. These results demonstrate the high efficiency of γ-Al₂O₃ nanomaterials in molybdenum adsorption and highlight their potential application in ⁹⁹Mo/⁹⁹ᵐTc generator systems.

采用5和80 nm的γ-Al₂O₃（γ-Al₂O₃）商用纳米粒子，采用放射性示踪技术研究了钼离子在水溶液中的吸附，该技术可以对痕量浓度进行研究，并准确监测溶液中物种的演变。为了表征这一过程，进行了动力学和平衡研究，以阐明吸附机理并确定最大吸附容量。结果表明，钼离子在γ-Al₂O₃中的滞留是快速的，主要发生在前2分钟，并且时间演化可以用拟二阶模型充分描述，表明钼酸盐阴离子与氧化铝表面之间存在特定的相互作用。5 nm的γ-Al₂O₃材料的吸附能力略高于80 nm的γ-Al₂O₃，这是由于它的比表面积更大。根据等温模型，γ-Al₂O₃-5 nm的最大吸附值（qm）为386.95 mg g⁻¹ ，γ-Al₂O₃-80 nm的最大吸附值为368.20 mg g⁻¹ 。这些结果证明了γ-Al₂O₃纳米材料对钼的高效吸附，并强调了它们在⁹Mo/⁹Tc发生器系统中的潜在应用。

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引用次数: 0