Applied Clay Science最新文献_第3页

Impact of different mixing temperature on the microstructural evolution and properties of metakaolin-based geopolymers 不同混合温度对偏高岭土聚合物微观结构演化及性能的影响

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2026-01-02 DOI: 10.1016/j.clay.2025.108106

Xiuqiong Fu , Qian Wan , Yong Fan , Yimin Zhang , Ruobing Zhang

Temperature has an important influence on geopolymerization. While existing studies have mainly focused on curing temperature effects, research on the influence of mixing temperature remains limited. This study investigated the effects of mixing temperature between alkali activators and metakaolin (MK) on the physical properties, microstructure, and reaction kinetics of metakaolin-based geopolymers (MKGs). The results demonstrated that different mixing temperatures led to distinct geopolymerization processes and had significant impacts on mechanical performance. With increasing mixing temperature, compressive strength first increased and then decreased. Geopolymers prepared at 50 °C (MKG50) exhibited a denser structure and the highest compressive strength, reaching 46.47 MPa at 7 days. Elevated mixing temperatures accelerated geopolymerization, promoting rapid dissolution of raw materials and coagulation of the paste. As the temperature increased from 25 °C to 90 °C, the final setting time was shortened from 351 to 6 min. Extreme mixing temperatures (5 °C and 90 °C) both induced rapid setting within 15 min but through distinct mechanisms. At 90 °C, excessively accelerated geopolymerization produced gel structures encapsulating incompletely decomposed raw materials, hindering subsequent reactions and deteriorating the structure and strength. In contrast, at 5 °C, rapid setting was caused by hydrated sodium silicate crystal inclusions, which did not negatively affect the final structure or performance, as the final setting was only 15 min, with an initial compressive strength of 2.66 MPa and achieved 36.80 MPa after 7 days. This suggests that low-temperature reaction can be used as an effective method for preparing rapid-setting geopolymers.

温度对地聚合有重要影响。现有的研究主要集中在固化温度的影响上，而对混合温度影响的研究还很有限。研究了碱活化剂与偏高岭土（MK）的混合温度对偏高岭土基地聚合物（MKGs）物理性质、微观结构和反应动力学的影响。结果表明，不同的混合温度会导致不同的地聚合过程，并对其力学性能产生显著影响。随着搅拌温度的升高，抗压强度先升高后降低。在50℃条件下制备的地聚合物（MKG50）结构致密，抗压强度最高，7天达到46.47 MPa。提高混合温度加速地聚合，促进原料的快速溶解和膏体的凝固。随着温度从25℃升高到90℃，最终凝固时间由351 min缩短至6 min。极端的混合温度（5°C和90°C）都在15分钟内引起快速凝固，但通过不同的机制。在90°C时，过度加速的地聚合会产生包裹未完全分解原料的凝胶结构，阻碍后续反应，使结构和强度恶化。而在5℃下，水化水玻璃晶体夹杂物快速凝固，对最终结构和性能没有负面影响，最终凝固时间仅为15 min，初始抗压强度为2.66 MPa， 7天后达到36.80 MPa。这表明低温反应可作为制备快速凝固地聚合物的有效方法。

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引用次数: 0

Copper-loaded halloysite nanotube-coated chitosan sutures: Enhanced antibacterial activity, mechanical strength, and reduced burst-release toxicity 负载铜的高岭土纳米管包覆壳聚糖缝合线：增强抗菌活性，机械强度，降低爆释毒性

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2026-01-02 DOI: 10.1016/j.clay.2025.108110

Renzheng Guan , Xinyan Hao , Chuyang Chen , Guangqi Cheng , Qianchen Huang , Shuang Wang , Fang Wang , Jiwei Li , Aihua Cui , Shaohua Zhang

This study presents the development of chitosan sutures functionalized with copper-loaded halloysite nanotubes (Cu@HNTs-CS) to achieve synergistically enhanced antibacterial efficacy, mechanical performance, and biocompatible properties. Alkali-treated halloysite nanotubes (NHNTs), characterized by hollow tubular structures with an inner diameter of 17 ± 2 nm, serve as nanoscale reservoirs for Cu²⁺. The dispersion of Cu@HNTs on chitosan fibers, facilitated by hydrogen bonding and electrostatic interactions between functional groups on chitosan and the hydroxyl/siloxy groups of HNTs, leads to improved tensile strength and an optimized friction coefficient, thereby balancing tissue penetration and knot security within the optimal surgical range. Furthermore, Cu@HNTs enable the sustained release of Cu²⁺, effectively preventing burst toxicity while maintaining antibacterial activity against S. aureus and E. coli. Moreover, the Cu@HNTs-CS sutures exhibit excellent biocompatibility, as evidenced by high cell viability and low hemolysis rate (<5 %). By harnessing the dual functionality of HNTs as both Cu²⁺ stabilizers and mechanical reinforcers, this study offers a scalable solution to address burst-release toxicity and poor mechanical properties inherent in chitosan sutures.

本研究提出了用负载铜的高岭土纳米管（Cu@HNTs-CS）功能化壳聚糖缝合线的开发，以实现协同增强的抗菌功效、机械性能和生物相容性。碱处理的高岭土纳米管（NHNTs）具有中空管状结构，内径为17±2 nm，可作为Cu2+的纳米储层。Cu@HNTs在壳聚糖纤维上的分散，通过壳聚糖上的官能团和HNTs的羟基/硅氧基之间的氢键和静电相互作用，导致抗拉强度的提高和摩擦系数的优化，从而在最佳手术范围内平衡组织渗透和结安全。此外，Cu@HNTs使Cu2+持续释放，有效防止突发毒性，同时保持对金黄色葡萄球菌和大肠杆菌的抗菌活性。此外，Cu@HNTs-CS缝合线具有良好的生物相容性，细胞活力高，溶血率低（5%）。通过利用HNTs作为Cu2+稳定剂和机械增强剂的双重功能，本研究提供了一种可扩展的解决方案，以解决壳聚糖缝合线固有的爆裂释放毒性和较差的机械性能。

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引用次数: 0

Production of clays for white porcelains from porcelain stone using eco-friendly iron impurity leaching with citric acid 利用环保铁杂质柠檬酸浸出法制备白瓷粘土

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2026-01-01 DOI: 10.1016/j.clay.2025.108052

Hiroaki Katsuki , Jin-Ho Kim , Masahiro Kugishima , Nobuaki Kamochi , Sridhar Komarneni , Jae-Hwan Pee

Porcelain stone, composed of quartz, feldspar, kaolin, and mica, is used to produce white porcelain clay. Therefore, many countries, such as Arita, Japan, renowned for porcelain stone, are making significant efforts to reduce iron impurities like α-FeOOH and FeS₂ in order to increase whiteness. In this study, the removal of iron impurities from Arita porcelain stone was investigated using citric acid (C₆H₈O₇) as an eco-friendly iron-leaching agent. Stone samples were treated with 0.05–1 M citric acid at 50 and 100 °C to analyze the iron leaching rate and whiteness of fired stones by measuring the residual Fe₂O₃ content. The effectiveness of iron leaching with citric acid was evaluated and compared to conventional 10 % HCl treatment. Specifically, α-FeOOH and FeS₂ iron residues were investigated; α-FeOOH was found to dissolve in acid, while FeS₂ remained insoluble. To modulate the temperature conditions, treatment time and citric acid concentration were effective in enhancing leaching and whiteness. In the results, the leaching rate of citric acid increased to 67.2 % at 50 °C over 54 h. It is novel that citric acid presents a more sustainable and economically viable option for iron impurity removal in porcelain stone processing compared to HCl and other leaching agents.

瓷石由石英、长石、高岭土和云母组成，用于生产白瓷粘土。因此，许多国家，如以瓷石闻名的日本有田，都在大力减少α-FeOOH、FeS2等铁杂质，以提高白度。本研究以柠檬酸（C6H8O7）为环保型铁浸出剂，对有田瓷石中铁杂质的去除进行了研究。用0.05-1 M柠檬酸在50℃和100℃条件下处理石料，通过测定焙烧石料残余Fe2O3含量，分析其铁浸出率和白度。对柠檬酸浸铁的效果进行了评价，并与常规10% HCl处理进行了比较。具体来说，α-FeOOH和FeS2铁残基进行了研究；α-FeOOH可溶于酸，而FeS2不溶于酸。调节温度条件、处理时间和柠檬酸浓度均能有效提高浸出率和白度。结果表明，在50℃条件下，经过54 h，柠檬酸的浸出率提高到67.2%。与HCl和其他浸出剂相比，柠檬酸是陶瓷石加工中去除铁杂质的一种更可持续和经济可行的选择。

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引用次数: 0

Clay-polymer nanocomposites with antimicrobial and antibiofilm properties 具有抗菌和抗生物膜性能的粘土-聚合物纳米复合材料

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2025-12-29 DOI: 10.1016/j.clay.2025.108108

Juraj Bujdák , Katarína Bilská , Helena Bujdáková

Over the past decade, clay-polymer nanocomposites with antimicrobial properties have attracted significant attention. This review summarizes recent developments and emerging trends, focusing on the mechanisms underlying their antimicrobial and antibiofilm activities. The modes of action, including drug release, contact killing, surface topography, and interactions among individual components within the nanocomposite structure, are analyzed. Strategies for designing effective materials to prevent biofilm formation are examined, along with a protocol for efficient modification of polymer surfaces. Common antimicrobial agents in these composites include organic surfactants, various drugs and antibiotics, volatile, essential oils, disinfectants, photosensitizers, metal ions, and nanoparticles. In addition to composites of conventional polymers and clay minerals, special attention is given to biopolymers, polyelectrolytes, hydrogels, sacrificial coatings, reactive or anti-adhesive surfaces, and materials based on halloysite. Multifunctional materials are also discussed. Applications include coatings, implants, tissue engineering, wound healing, dentistry, textiles, and packaging. Future research should clarify antimicrobial action at the molecular level and develop cost-effective strategies for large-scale production.

在过去的十年中，具有抗菌性能的粘土-聚合物纳米复合材料引起了人们的广泛关注。本文综述了近年来的发展和新兴趋势，重点介绍了其抗菌和抗生物膜活性的机制。分析了纳米复合材料的作用模式，包括药物释放、接触杀伤、表面形貌以及纳米复合材料结构中单个组分之间的相互作用。研究了设计有效材料以防止生物膜形成的策略，以及有效修饰聚合物表面的协议。这些复合材料中常见的抗菌剂包括有机表面活性剂、各种药物和抗生素、挥发物、精油、消毒剂、光敏剂、金属离子和纳米颗粒。除了传统聚合物和粘土矿物的复合材料外，还特别关注生物聚合物、聚电解质、水凝胶、牺牲涂层、反应性或抗粘合表面以及基于高岭土的材料。对多功能材料也进行了讨论。应用包括涂料、植入物、组织工程、伤口愈合、牙科、纺织品和包装。未来的研究应在分子水平上阐明抗菌作用，并为大规模生产制定具有成本效益的策略。

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引用次数: 0

Corrigendum to “Evolution of steel-bentonite interactions under hydrothermal gradients: Mineralogical and geochemical implications for nuclear waste disposal” [Applied Clay Science, volume 281 (2026), 108084] “热液梯度下钢-膨润土相互作用的演变：核废料处理的矿物学和地球化学意义”的勘误表[应用粘土科学，第281卷（2026），108084]

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2025-12-29 DOI: 10.1016/j.clay.2025.108112

Carlos Mota-Heredia, Jaime Cuevas, Raúl Fernández

引用次数: 0

Confinement effect of layered double hydroxide nanofillers on suppressing antioxidant migration in polypropylene composites 层状双氢氧化物纳米填料抑制聚丙烯复合材料中抗氧化剂迁移的约束效应

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2025-12-24 DOI: 10.1016/j.clay.2025.108109

Zhaoyu Chu , Zijia Li , Yinghan Guo , Yalin Shi , Pinggui Tang , Yongjun Feng

The long-term stability and low migration of functionalized composites can be achieved by suppressing the migration of hindered phenolic antioxidants. Here, an interlayer “fence” structure was constructed in layered double hydroxides (LDH) by following the differential affinity and cohesion between guest anions and host laminates, thereby enhancing the anti-migration of intercalated antioxidants. Using 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid (DBHP, a representative antioxidant), DBHP-intercalated LDH (D-LDH) was synthesized, followed by the introduction of metanilic acid (MA) via partial anion exchange to form a confined “fence” structure (MA/D-LDH) upon further thermal treatment at 200 °C. The “fence” structure significantly improved the anti-migration of DBHP, as evidenced in LDH/polypropylene (PP) composites. Increasing the MA exchange ratio enhanced the shielding effect on intercalated DBHP anions, improving the thermal stability of MA/D-LDH and its heat-treated derivative (MA/D-LDH-T). Compared with pristine D-LDH, the 24 % MA/D-LDH-T additive exhibited a 58 °C increase in thermal decomposition temperature (T_50%, from 346 °C to 404 °C) and a 78.77 % enhancement in anti-migration. The antioxidant migration rate in the composite was reduced to 8.35 %, markedly lower than that of commercial Irganox 1010 (39.33 %). Both MA/D-LDH/PP and MA/D-LDH-T/PP composites demonstrated superior thermal stability and anti-aging performance, highlighting their potential for reliable PP applications.

通过抑制受阻酚类抗氧化剂的迁移，可以实现功能化复合材料的长期稳定和低迁移。在层状双氢氧化物（LDH）中，根据客体阴离子和宿主层板之间的不同亲和力和内聚性，构建了层间“栅栏”结构，从而增强了嵌入的抗氧化剂的抗迁移能力。以代表性抗氧化剂3-（3,5-二叔丁基-4-羟基苯基）丙酸（DBHP）为原料，合成DBHP插层LDH (D-LDH)，然后通过部分阴离子交换引入甲苯酸（MA），在200℃下进一步热处理，形成封闭的“栅栏”结构（MA/D-LDH）。在LDH/聚丙烯（PP）复合材料中，“栅栏”结构显著提高了DBHP的抗迁移性。提高MA交换率增强了对插入DBHP阴离子的屏蔽作用，提高了MA/D-LDH及其热处理衍生物（MA/D-LDH- t）的热稳定性。与原始D-LDH相比，24% MA/D-LDH- t添加剂的热分解温度提高了58°C (T50%，从346°C提高到404°C)，抗迁移能力提高了78.77%。复合材料的抗氧化剂迁移率降至8.35%，显著低于市售Irganox 1010的39.33%。MA/D-LDH/PP和MA/D-LDH- t /PP复合材料均表现出优异的热稳定性和抗老化性能，突出了它们在PP领域的可靠应用潜力。

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引用次数: 0

Investigation of tribological performance of bio-based palm oil reinforced with oleic acid modified kaolin nanoparticles in cold rolling 油酸改性纳米高岭土增强生物基棕榈油冷轧摩擦性能研究

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2025-12-23 DOI: 10.1016/j.clay.2025.108107

Batuhan Özakın , Kürşat Gültekin , Özgür Aygür

Developing bio-based and high-performance lubricants for sustainable metal forming processes is an increasing necessity in the industry. This study systematically investigated the cold rolling performance of palm nanolubricant doped with oleic acid-modified kaolin nanoparticles. The nanolubricants were prepared at different particle sizes (350 nm and 650 nm) and concentrations (0.125, 0.25, and 0.5 wt%). Cold-rolling experiments were then performed on AISI 304 stainless steel strips using reduction ratios of 1.5 % and 7.5 %. The results indicate that, at a 1.5 % reduction ratio, the doping of 0.5 wt% kaolin nanoparticles with a size of 350 nm to the lubricant reduced the rolling force by 28 % compared to pure palm oil and by 40 % under dry conditions. Furthermore, surface roughness values showed significant improvement, with enhancements of 35 % and 51 %, respectively. Small particles (350 nm) were found to effectively fill surface micro-voids to form a protective tribo-film layer, reducing friction and wear and significantly improving surface quality. Two-dimensional (2D) roughness measurements, three-dimensional (3D) area scanning analyses, and material ratio curves (MRC) support each other, confirming this mechanism. The study demonstrates that doping surface-modified kaolin nanoparticles suitable for vegetable-based lubricants is a promising approach for developing new-generation nanolubricants. Under the tested laboratory-scale conditions, these nanolubricants showed potential to reduce friction and wear in cold rolling applications, which may contribute to lower energy consumption and longer roll life, while supporting sustainable manufacturing objectives.

为可持续的金属成形工艺开发生物基和高性能润滑剂是工业中日益增长的需求。本研究系统地研究了油酸修饰的纳米高岭土掺杂棕榈纳米润滑剂的冷轧性能。制备了不同粒径（350 nm和650 nm）和浓度（0.125、0.25和0.5 wt%）的纳米润滑剂。然后对aisi304不锈钢带材进行了冷轧试验，压下率分别为1.5%和7.5%。结果表明，在1.5%的还原率下，与纯棕榈油相比，掺入0.5 wt%、尺寸为350 nm的高岭土纳米颗粒可使轧制力降低28%，在干燥条件下可使轧制力降低40%。此外，表面粗糙度值也有显著改善，分别提高了35%和51%。发现小颗粒（350 nm）可以有效填充表面微空隙，形成保护性摩擦膜层，减少摩擦磨损，显著提高表面质量。二维（2D）粗糙度测量、三维（3D）区域扫描分析和材料比曲线（MRC）相互支持，证实了这一机制。研究表明，在植物基润滑剂中掺杂表面改性的纳米高岭土是开发新一代纳米润滑剂的一种很有前途的方法。在实验室规模的测试条件下，这些纳米润滑剂显示出在冷轧应用中减少摩擦和磨损的潜力，这可能有助于降低能耗和延长轧辊寿命，同时支持可持续制造目标。

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引用次数: 0

Effects of pH and cations on adsorption of glyphosate and phosphate at clay minerals pH和阳离子对粘土矿物吸附草甘膦和磷酸盐的影响

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2025-12-22 DOI: 10.1016/j.clay.2025.108094

Mingshuai Wang, Joel Fabregat-Palau, Stefan B. Haderlein

Although competitive interactions between glyphosate (Gly) and phosphate (PO₄) in soils were previously confirmed, systematic investigations of their behavior on homo-ionic phyllosilicate clay minerals remain limited. This study employed adsorption edge experiments at different pH conditions to derive solid/liquid distribution coefficients (K_d) and evaluated Gly and PO₄ species-specific adsorption contributions on potassium- and calcium-saturated homo-ionic kaolinite (K-, Ca-kao) and montmorillonite (K-, Ca-mont), alongside elucidating related adsorption mechanisms. The results identified H₂Gly⁻ as the dominant Gly species driving adsorption on K-clays. For PO₄, H₂PO₄⁻ governed adsorption on K-kao, while its enhanced uptake on K-mont under alkaline conditions was reflected in the model by PO₄³⁻ species. In contrast, both Gly and PO₄ exhibited Ca²⁺-bridged co-adsorption mechanisms on Ca-clays, yielding enhanced adsorption capacities compared to K-clays. At alkaline pH, removal of aqueous PO₄ was primarily attributed to Ca²⁺-PO₄ precipitation. Competitive adsorption data, combined with single-system results, resolved the interplay of surface complexation, interlayer adsorption, and hydrogen bonding under co-adsorption conditions. Notably, Ca²⁺ played a dual role by promoting Gly release under competition yet enhancing Gly adsorption in single scenarios. The sorption comparison of Gly and PO₄ with Fe/Al oxides revealed preferential PO₄ adsorption at oxides, while Gly showed comparable adsorption affinity, validating previous kinetic competition analyses. This study elucidates the distinct roles of adsorbate speciation, cation type, and mineral structure, thereby providing a conceptual framework essential for advancing predictions of contaminant behavior in complex environmental systems.

虽然土壤中草甘膦（Gly）和磷酸盐（PO4）之间的竞争性相互作用先前已被证实，但对它们在同离子层状硅酸盐粘土矿物上的行为的系统研究仍然有限。本研究通过不同pH条件下的吸附边实验，得到了固液分布系数（Kd），并评估了Gly和PO4在钾和钙饱和均离子高岭石（K-, Ca-kao）和蒙脱土（K-, Ca-mont）上的特异性吸附贡献，并阐明了相关的吸附机制。结果表明H2Gly -是驱动k -粘土吸附的主要Gly种类。对于PO4， H2PO4−控制k -花王对PO4的吸附，而在碱性条件下，PO43−物种对K-mont的吸收增强反映在模型中。相比之下，Gly和PO4在钙粘土上均表现出Ca2+桥接共吸附机制，与k -粘土相比，其吸附能力增强。在碱性pH下，水中PO4的去除主要归因于Ca2+-PO4的沉淀。竞争吸附数据结合单系统结果，解决了共吸附条件下表面络合、层间吸附和氢键的相互作用。值得注意的是，Ca2+在竞争条件下促进Gly释放，在单一条件下增强Gly吸附，具有双重作用。Gly和PO4对Fe/Al氧化物的吸附比较表明，氧化物对PO4的吸附优先，而Gly具有相当的吸附亲和力，验证了先前的动力学竞争分析。这项研究阐明了吸附质形态、阳离子类型和矿物结构的独特作用，从而为复杂环境系统中污染物行为的预测提供了一个必不可少的概念框架。

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引用次数: 0

Hierarchically structured cobalt-aluminium layered double hydroxides for photocatalytic CO₂ reduction using calcined cotton fiber templates 使用煅烧棉纤维模板用于光催化CO₂还原的分层结构钴铝层状双氢氧化物

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2025-12-22 DOI: 10.1016/j.clay.2025.108105

Marta Estrada-Ruiz, Daniel Cosano, Dolores Esquivel, Francisco J. Romero-Salguero, José R. Ruiz

In this work, natural cotton fibers were thermally transformed into hollow carbon fibers through a calcination process. These carbon fibers served as templates for the hierarchical synthesis of cobalt‑aluminium layered double hydroxides (CoAl-LDH) using both hydrothermal and homogeneous precipitation methods. Different instrumental techniques such as X-ray diffraction, elemental analysis, thermogravimetric analysis, infrared and Raman spectroscopies and electron microscopy techniques were used to study the synthesized catalysts. The photocatalytic performance of the CoAl-LDH based materials was tested for the photoreduction of CO₂ to CO using [Ru(bpy)₃]Cl₂ as a photosensitizer, and triethanolamine as a sacrificial electron donor. Control experiments confirmed the essential role of each component, as removing any of them resulted in no CO production. Among the catalysts tested, 3D hierarchical CoAl-LDH supported on carbon fibers (LDH@CF) exhibited superior CO production, achieving 18 mmol·g⁻¹ in 90 min, three times higher than the conventional 2D layered double hydroxides under identical conditions. This enhancement is attributed to the synergistic effect between the carbon substrate and the catalyst, which improves light harvesting, charge separation and CO₂ adsorption. These findings highlight the structural advantages of hierarchical LDH‑carbon composites in advancing CO₂ photoreduction technologies.

在这项工作中，天然棉纤维通过煅烧过程热转化为中空碳纤维。这些碳纤维作为模板，使用水热法和均匀沉淀法分层合成钴铝层状双氢氧化物（CoAl-LDH）。利用x射线衍射、元素分析、热重分析、红外和拉曼光谱以及电子显微镜等仪器技术对合成的催化剂进行了研究。以[Ru（bpy）₃]Cl₂为光敏剂，三乙醇胺为牺牲电子给体，测试了煤- ldh基材料光催化CO₂还原成CO的性能。对照实验证实了每种成分的重要作用，因为去除它们中的任何一种都不会产生一氧化碳。在测试的催化剂中，碳纤维负载的三维分层煤- ldh （LDH@CF）表现出优异的CO产量，在90 min内达到18 mmol·g−1，是相同条件下传统二维分层双氢氧化物的3倍。这种增强是由于碳衬底和催化剂之间的协同作用，从而改善了光收集，电荷分离和CO₂吸附。这些发现突出了分层LDH -碳复合材料在推进CO₂光还原技术方面的结构优势。

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引用次数: 0

Removal of aqueous thiotungstates and polytungstates by delaminated magnesium/iron-based layered double hydroxide 脱层镁/铁基层状双氢氧化物去除水中硫钨酸盐和多钨酸盐

IF 5.8 2区地球科学 Q2 CHEMISTRY, PHYSICAL

Applied Clay Science

Pub Date : 2025-12-21 DOI: 10.1016/j.clay.2025.108104

Qian Zhao, Qinghai Guo, Wenqi Zhu, Junbiao Qian

Tungsten (W) is a typical toxic element. Compared to monotungstates, the most common W species, thiotungstates and polytungstates are characterized by higher toxicity and mobility. However, removal of aqueous thiotungstates or polytungstates for environmental protection purposes was little investigated, because it was only recently found that these much-less studied W species may dominate in some (contaminated) natural waters. In view that magnesium/iron-based layered double hydroxide (Mg-Fe-LDH) was capable of removing monotungstates from water, the strategy of delamination of Mg-Fe-LDH was proposed in the present study, which was proved to be effective in improving the sorption of thio/polytungstates. Delaminated Mg-Fe-LDH exhibited a capability to remove aqueous thio/polytungstates rapidly and efficiently because more active sites were exposed on its external surface. Its maximum sorption capacities reached 443.78 mmol/kg for thiotungstates and 579.28 mmol/kg for polytungstates, which were much higher than those reported for other sorbents. Moreover, the W removal efficiency of delaminated Mg-Fe-LDH was not substantially influenced by competitive anions' presence. X-ray diffraction and X-ray photoelectron spectroscopy analyses indicated that the sorption of thiotungstates and polytungstates was attributed to adsorption-induced restacking of delaminated nanosheets and inner-sphere complexation with Fe atoms on the LDH layer surfaces and edges. Overall, delaminated Mg-Fe-LDH holds a high sorption capacity for thiotungstates and polytungstates under various environmental conditions, making it promising for future large-scale applications in treatment of thio/polytungstates-contaminated waters.

钨(W)是一种典型的有毒元素。与最常见的单钨酸盐相比，硫钨酸盐和多钨酸盐具有更高的毒性和迁移率。然而，以环境保护为目的去除水中硫钨酸盐或多钨酸盐的研究很少，因为直到最近才发现这些研究较少的W物种可能在一些（受污染的）自然水中占主导地位。鉴于镁/铁基层状双氢氧化镁（Mg-Fe-LDH）能够去除水中的单钨酸盐，本研究提出了Mg-Fe-LDH的分层策略，并证明了该策略对提高硫/多钨酸盐的吸附效果是有效的。分层Mg-Fe-LDH表现出快速有效去除水中硫/多钨酸盐的能力，因为它的外表面暴露了更多的活性位点。其对硫钨酸盐的最大吸附量为443.78 mmol/kg，对多钨酸盐的最大吸附量为579.28 mmol/kg，远高于其他吸附剂。此外，分层Mg-Fe-LDH的W去除率不受竞争阴离子存在的显著影响。x射线衍射和x射线光电子能谱分析表明，硫钨酸盐和多钨酸盐的吸附是由于吸附引起的分层纳米片的重新堆积以及与铁原子在LDH层表面和边缘的内球络合。总体而言，脱层Mg-Fe-LDH在各种环境条件下对硫钨酸盐和多钨酸盐具有较高的吸附能力，有望在未来大规模应用于处理硫/多钨酸盐污染的水体。

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