Applied Clay Science最新文献_第2页

Insight into the spiral growth of disordered kaolinite nanocrystals 无序高岭石纳米晶体螺旋生长的深入研究

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-09-06 DOI: 10.1016/j.clay.2025.107981

Yongjie Yang , Long Chen , Jiale Pu , Qiang Luo , Maguy Jaber , Christelle Souprayen , Ning Wang , Qinfu Liu

{"title":"Insight into the spiral growth of disordered kaolinite nanocrystals","authors":"Yongjie Yang , Long Chen , Jiale Pu , Qiang Luo , Maguy Jaber , Christelle Souprayen , Ning Wang , Qinfu Liu","doi":"10.1016/j.clay.2025.107981","DOIUrl":"10.1016/j.clay.2025.107981","url":null,"abstract":"<div><div>Structural disorder in kaolinite critically shapes its reactivity and performance across environmental and industrial contexts. Insights into spiral growth offer a mechanistic framework to decode the structural disorder of kaolinite and advance our understanding of its formation and properties. We identified a distinct expansion of the (001) interlayer spacing, from ∼7.16 Å in well-ordered kaolinite to ∼7.21 Å in disordered samples, along with selective enhancement of the (020) reflection in disordered nanocrystals. This structural disorder is closely linked to Al(4)-for-Si(4) substitution, with a high Al(4)/Al total ratio (∼2.83 %). The ionic radius ratio of <span><math><msub><mi>R</mi><mrow><msup><mi>Al</mi><mi>III</mi></msup><mfenced><mn>4</mn></mfenced></mrow></msub></math></span><sub>:</sub><span><math><msub><mi>R</mi><msup><mi>O</mi><mrow><mn>2</mn><mo>−</mo></mrow></msup></msub></math></span>=0.438 substantially exceeds that of ideal tetrahedral packing, compared to <span><math><msub><mi>R</mi><mrow><msup><mi>Si</mi><mi>IV</mi></msup><mfenced><mn>4</mn></mfenced></mrow></msub></math></span><sub>:</sub><span><math><msub><mi>R</mi><msup><mi>O</mi><mrow><mn>2</mn><mo>−</mo></mrow></msup></msub></math></span>=0.331, generating internal stress that exceeds the structural tolerance of triclinic kaolinite. When this stress exceeds a critical threshold, it likely promotes the formation of screw dislocations, which initiate spiral growth and generating stacking faults and in-plane lattice rotations (∼5°), as evidenced by Moiré fringe patterns and SAED. Spiral growth thus acts as a stress-adaptive mechanism, enabling the crystal to accommodate structural instability while maintaining long-range order and anisotropic deformation. These findings recast disorder as a stress-regulated growth strategy and offer a mechanistic blueprint for tuning structure in low-dimensional layered materials.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107981"},"PeriodicalIF":5.8,"publicationDate":"2025-09-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145003772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanochemical effect assisted oxidative whitening of black talc 机械化学效应辅助黑滑石氧化增白

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-09-03 DOI: 10.1016/j.clay.2025.107961

Huan Shuai , Xianrong Yang , Xi Xu , Gaoxiang Du , Jiao Wang

{"title":"Mechanochemical effect assisted oxidative whitening of black talc","authors":"Huan Shuai , Xianrong Yang , Xi Xu , Gaoxiang Du , Jiao Wang","doi":"10.1016/j.clay.2025.107961","DOIUrl":"10.1016/j.clay.2025.107961","url":null,"abstract":"<div><div>Black talc, a carbon-intercalated phyllosilicate mineral, is significantly limited in industrial applications due to its intrinsic low whiteness. Conventional whitening methods relying on high-temperature calcination inevitably compromise its layered crystalline structure through thermal decomposition. This study presents a mechanochemically assisted oxidative strategy that achieves effective whitening while preserving structural integrity. By combining mechanical exfoliation with oxidative activation, the interlayer graphite carbon domains in black talc were selectively oxidized, thus significantly increasing the whiteness. Compared with mechanical treatment alone (whiteness 25.7) or chemical treatment alone (whiteness 52.4), the synergistic coupling of mechanical activation and oxidant (whiteness 75.7) increased the whitening efficiency by 626 % and 299 %, respectively. Systematic characterization via X-ray photoelectron spectroscopy (XPS) and thermogravimetric analysis (TGA) revealed a synergistic mechanism: (i) mechanical delamination exposing encapsulated carbon layers and (ii) surface activation promoting oxidative radical generation for carbon removal. Notably, the layered framework remained intact post-treatment, as evidenced by maintained interlayer spacing and absence of phase transformation, contrasting sharply with the structural collapse observed in calcination-based approaches. Although current exploration focuses on carbonaceous minerals, this mechanochemical paradigm establishes a versatile platform for high-value utilization of heat-sensitive mineral resources, particularly in applications demanding structural preservation, such as functional composites and precision ceramics manufacturing.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107961"},"PeriodicalIF":5.8,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144932604","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thiol functionalized kaolin pellets: Development and optimization for mercury ion removal from aqueous solutions 硫醇功能化高岭土颗粒：开发和优化从水溶液中去除汞离子

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-09-02 DOI: 10.1016/j.clay.2025.107983

Awal Adava Abdulsalam , Madina Pirman , Dilnaz Begenova , George Z. Kyzas , Dehua Xia , Tri Thanh Pham , Boris Golman , Stavros G. Poulopoulos

{"title":"Thiol functionalized kaolin pellets: Development and optimization for mercury ion removal from aqueous solutions","authors":"Awal Adava Abdulsalam , Madina Pirman , Dilnaz Begenova , George Z. Kyzas , Dehua Xia , Tri Thanh Pham , Boris Golman , Stavros G. Poulopoulos","doi":"10.1016/j.clay.2025.107983","DOIUrl":"10.1016/j.clay.2025.107983","url":null,"abstract":"<div><div>Mercury contamination in aqueous media poses a severe environmental and health risk due to its high toxicity and bioaccumulation potential. In this study, a novel thiol-grafted kaolin pellet adsorbent was developed for efficient Hg<sup>2+</sup> remediation. The pellet production involved a combination of acid-base treatment, 3-mercaptopropyltrimethoxysilane grafting, and extrusion with polyvinyl alcohol serving as a binder. Additionally, a novel approach was developed to assess biofilm formation on the produced pellets. Characterization results confirmed the successful grafting of thiol groups, providing high-affinity binding sites for Hg<sup>2+</sup> ions. Optimal operating conditions were identified using 2-mm pellets, 1.5 wt% PVA, 5 g/L dosage, and an initial solution pH of 5, achieving 74.2 % removal and adsorption capacities of up to 12.5 mg/g at 313 K. Kinetic studies revealed that Hg<sup>2+</sup> uptake followed a pseudo-second-order model (R<sup>2</sup> = 0.986), while isotherm studies indicated the Freundlich model (R<sup>2</sup> = 0.987, 0.993, and 0.997 for 293, 303, and 313 K, respectively) as the best model. Antibacterial assays demonstrated that raw and acid-base-treated kaolin pellets inhibited biofilm formation for <em>E. coli (BL21)</em>, <em>P. aeruginosa</em>, <em>S. epidermidis</em>, and <em>S. aureus</em>, whereas thiol-grafted pellets promoted biofilm development, highlighting the need to balance adsorptive enhancement with potential microbial colonization. These findings confirm the potential of kaolin-based pellet adsorbents for Hg<sup>2+</sup> remediation, offering a viable framework for scaling up into industrial applications.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107983"},"PeriodicalIF":5.8,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ transformation of a natural Xuyi palygorskite into nano-structured K-Ca-Fe-Mg/SAPO-34 zeolites for enhanced MTO catalytic performance 天然盱眙县坡高岭土原位转化为纳米结构K-Ca-Fe-Mg/SAPO-34分子筛以增强MTO催化性能

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-09-01 DOI: 10.1016/j.clay.2025.107982

Haizhou Tian , Jianghui Tao , Zheng Wang

{"title":"In-situ transformation of a natural Xuyi palygorskite into nano-structured K-Ca-Fe-Mg/SAPO-34 zeolites for enhanced MTO catalytic performance","authors":"Haizhou Tian , Jianghui Tao , Zheng Wang","doi":"10.1016/j.clay.2025.107982","DOIUrl":"10.1016/j.clay.2025.107982","url":null,"abstract":"<div><div>A nano-structured K-Ca-Fe-Mg/SAPO-34 (MeAPSO-34) composite catalyst was successfully synthesized through the in-situ transformation of palygorskite (Pal) under steam-assisted crystallization conditions. Pal served as a multifunctional precursor, providing inherent Si, Al, Fe, Mg, K, and Ca elements that were directly incorporated into the catalyst framework without the addition of external metal sources. This approach facilitated the formation of hierarchically porous SAPO-34 zeolites with a well-balanced distribution of Brønsted and Lewis acid sites, as confirmed by comprehensive characterization techniques including XRD, SEM, BET, XPS, and NH<sub>3</sub>-TPD. Complete methanol conversion was achieved over the MeAPSO-34 zeolite catalyst, with ethylene and propylene selectivities of 69.0 % and 27.4 %, respectively, at a reaction temperature of 410 °C, a methanol-to-water feed ratio of 1:6, and a weight hourly space velocity (WHSV) of 1 h<sup>−1</sup>. Notably, the synergistic interaction among the K, Ca, Fe, and Mg multi-metallic components significantly promoted the water-gas shift reaction and effectively suppressed coke deposition. Furthermore, the nanostructured morphology of the catalyst reduced the diffusion limitations by shortening the gas-phase transport pathways, thereby enhancing the overall catalytic performance of the SAPO-34 zeolite. This study presents a scalable strategy for designing high-performance methanol-to-olefin (MTO) catalysts through the direct transformation of clay minerals into nanostructured multifunctional materials.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107982"},"PeriodicalIF":5.8,"publicationDate":"2025-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144924966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A physics-based CatBoost model for water retention of compacted bentonite with global sensitivity analysis 基于物理的膨润土保水性CatBoost模型及全局敏感性分析

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-08-30 DOI: 10.1016/j.clay.2025.107948

Muntasir Shehab , Reza Taherdangkoo , Christoph Butscher

{"title":"A physics-based CatBoost model for water retention of compacted bentonite with global sensitivity analysis","authors":"Muntasir Shehab , Reza Taherdangkoo , Christoph Butscher","doi":"10.1016/j.clay.2025.107948","DOIUrl":"10.1016/j.clay.2025.107948","url":null,"abstract":"<div><div>Bentonite is a recommended buffer material in high-level radioactive waste repositories to restrict the migration of radionuclides into the environment. Determining the soil water retention curve (SWRC) of bentonite is essential for predicting its hydraulic behaviour, including water flow dynamics and saturation time, which are critical for evaluating the performance of engineered barrier systems. This study compiled 46 experimental SWRCs from existing literature containing 311 data points of matric potential and corresponding water content. Key soil properties associated with these data points include specific gravity, montmorillonite content, initial dry density, initial water content, initial void ratio, and plasticity index. The Van Genuchten model parameters were optimized using the Levenberg–Marquardt algorithm for each of the 46 SWRCs. To enrich the SWRC data, 20 additional data points of matric potential were generated, and the predicted water content from the optimized Van Genuchten models was then combined with the experimental data. A machine learning model was developed to predict the SWRC of bentonite using the CatBoost machine learning algorithm; and fine-tuned its hyper-parameters using the artificial gorilla troops optimizer. As input, the machine learning model used matric potential, key soil properties, and experimental conditions such as confined or unconfined states and drying or wetting paths. The machine learning model shows very good performance in estimating the water content at various matric potentials, offering an efficient method to determine the SWRC of bentonite based on key soil properties.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107948"},"PeriodicalIF":5.8,"publicationDate":"2025-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144916278","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Particle size evolution of granular bentonite in hydro-mechanical paths 粒状膨润土在水-力学路径中的粒度演化

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-08-27 DOI: 10.1016/j.clay.2025.107975

Hao Zeng , Laura Gonzalez-Blanco , Enrique Romero

{"title":"Particle size evolution of granular bentonite in hydro-mechanical paths","authors":"Hao Zeng , Laura Gonzalez-Blanco , Enrique Romero","doi":"10.1016/j.clay.2025.107975","DOIUrl":"10.1016/j.clay.2025.107975","url":null,"abstract":"<div><div>Granular bentonite (GB) is a candidate material for engineered barriers in geological disposal of radioactive waste. Previous studies have focused on the hydro-mechanical (HM) behaviour of GB and the resulting evolution of pore size distribution, whereas this study additionally examines changes in its particle size distribution, which spans from micrometres to several millimetres. During wetting under unstressed conditions for pouring GB, coarse and high-density granules disaggregated, while fine grains aggregated, resulting in larger-sized and lower-density aggregates. Particle swelling upon wetting caused a significant decrease in the dry density of GB on pouring, indicating that wetter GB required greater compaction energy to achieve a specified dry density. Changes in particle size distribution after pouring and compaction also impacted the microstructure of the samples, directly influencing their subsequent HM behaviour, which was examined through the particle size evolution after different loading and wetting paths. The initial water content conditioned granule behaviour and its breakage upon loading. At low water content, stiff granules prompted breakage, thereby increasing sample compressibility. Conversely, aggregate sticking during loading at elevated water content protected the soft granules from breakage and reduced sample compression. The aggregation and expansion of aggregates dominated the HM response to further wetting, contributing to the swelling of samples even under high stress. These particle-scale insights into the evolution of the material's initial conditions and their influence on microstructural and HM behaviour are expected to help in guiding the evaluation of GB barriers' HM stability and permeability during service.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107975"},"PeriodicalIF":5.8,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Preparation and characterization of chitosan/palygorskite for the adsorption of ochratoxin A 壳聚糖/坡缕石吸附赭曲霉毒素A的制备及表征

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-08-27 DOI: 10.1016/j.clay.2025.107951

Jie Lei , Hongjuan Sun , Tongjiang Peng , Bo Liu , Saeed Rehman , Shize Chen

{"title":"Preparation and characterization of chitosan/palygorskite for the adsorption of ochratoxin A","authors":"Jie Lei , Hongjuan Sun , Tongjiang Peng , Bo Liu , Saeed Rehman , Shize Chen","doi":"10.1016/j.clay.2025.107951","DOIUrl":"10.1016/j.clay.2025.107951","url":null,"abstract":"<div><div>Mycotoxins represent a persistent global challenge, posing a significant threat to human health and food safety. However, the application of effective detoxification strategies for various mycotoxins, particularly non-polar ochratoxin A (OTA), remains highly scarce. In this work, a chitosan/palygorskite (C-A<sub>1</sub>) was successfully synthesized via hydrothermal method, using palygorskite (Pal) as a template and chitosan (CS) as a modifying agent. The introduced functional groups (-OH and -NH₂) on the composite surface provided abundant active sites for OTA adsorption. The introduced functional groups (-OH and -NH₂) on the composite surface provided abundant active sites for OTA adsorption. The adsorption capacity for OTA increased from 0.94 mg/g in Pal raw ore to 1.94 mg/g. Meanwhile, C-A<sub>1</sub> demonstrated remarkable adsorption stability, with negligible desorption under simulated gastrointestinal pH conditions. Kinetic and isotherm adsorption studies were further conducted, indicating that the OTA adsorption by C-A<sub>1</sub> was primarily governed by hydrophobic interactions, partitioning effects, electrostatic interactions, and hydrogen bonding. The adsorption process followed pseudo-second-order kinetic model and a linear isotherm model, suggesting that chemical bonding played a dominant role. In conclusion, these findings highlight the good adsorption performance of C-A<sub>1</sub> toward OTA and establish its potential as an effective adsorbent for nonpolar mycotoxins in the adsorption system.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107951"},"PeriodicalIF":5.8,"publicationDate":"2025-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144903430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dual role of halloysite nanotubes in the synthesis of the complex with CoAl2O4 and tetracycline degradation 高岭土纳米管在与CoAl2O4配合物合成和四环素降解中的双重作用

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-08-25 DOI: 10.1016/j.clay.2025.107978

Yuqi Zhang , Yunan Zhong , Pengfei Zhang , Yang Zheng , Chunfang Du

{"title":"Dual role of halloysite nanotubes in the synthesis of the complex with CoAl2O4 and tetracycline degradation","authors":"Yuqi Zhang , Yunan Zhong , Pengfei Zhang , Yang Zheng , Chunfang Du","doi":"10.1016/j.clay.2025.107978","DOIUrl":"10.1016/j.clay.2025.107978","url":null,"abstract":"<div><div>Halloysite nanotubes (HNTs) served as the support and aluminum source for in-situ synthesizing CoAl<sub>2</sub>O<sub>4</sub>/HNTs (CAO/HNTs), which acted as an effective catalyst to activate peroxymonosulfate (PMS) for degrading tetracycline hydrochloride (TC). To achieve the optimal removal performance, various parameters were optimized. The final CAO/HNTs demonstrated a high degradation efficiency of 88 % toward TC within 40 min, which was 1.69 times as high as that of pure CAO. The existence of HNTs made CAO highly dispersed, increasing the number of exposed active sites and the contact opportunities between CAO and TC molecules, which enabled CAO to participate in the reaction more effectively and thus improved the degradation efficiency. Additionally, the formation of Co-O-Al bonds facilitated the growth of CAO into a three-dimensional (3D) spherical structure with more active sites other than the tetrahedral structure on HNTs. In the CAO/HNTs/PMS system, O<sub>2</sub><sup>•–</sup> and <sup>1</sup>O<sub>2</sub> contributed mostly to the catalytic process. This work not only provides a novel catalyst for the treatment of antibiotic pollution, but also offers an innovative strategy for fabricating functional materials on the basis of chemical composition and morphology characteristics of natural minerals.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107978"},"PeriodicalIF":5.8,"publicationDate":"2025-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Alteration behavior of high- and low-pH cement paste–compacted bentonite samples in contact with seawater 高、低ph水泥浆-压实膨润土试样与海水接触时的蚀变行为

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-08-21 DOI: 10.1016/j.clay.2025.107980

Yutaro Kobayashi , Tsutomu Sato

{"title":"Alteration behavior of high- and low-pH cement paste–compacted bentonite samples in contact with seawater","authors":"Yutaro Kobayashi , Tsutomu Sato","doi":"10.1016/j.clay.2025.107980","DOIUrl":"10.1016/j.clay.2025.107980","url":null,"abstract":"<div><div>This study investigated the interactions between high- and low-pH cement pastes and compacted bentonite in seawater environments, which is relevant to geological disposal of radioactive waste. The investigation combined immersion tests, various analytical techniques, and conceptual reactive transport modeling to examine mineralogical transformation and structural changes at cement–bentonite interfaces. The results showed that seawater infiltration pathways significantly influenced interactions at the interface. When seawater passed through the cement and made contact with bentonite, interactions were limited to near-surface areas of the bentonite side. However, more extensive alterations of the bentonite were observed at the interface when seawater reached the cement via bentonite. High-pH cement specimens exhibited significant mineral alterations, including cement hydrate dissolution and secondary mineral formation, while low-pH cement specimens showed less extensive mineral changes. The research revealed that pH fronts, determined by cement type, controlled elemental distributions and mineral transformations. High-pH cement generated steeper chemical gradients, resulting in more substantial alterations in both materials. Low-pH cement showed minimal bentonite alteration due to its lower pH than high-pH cement, but underwent significant structural changes when exposed to seawater-derived magnesium. Near cementitious materials, exchangeable cation content of montmorillonite changed from Na-dominant to Ca-dominant, independent of cement type. Although montmorillonite dissolution was limited, secondary mineral formation significantly affected mass transfer properties. These findings suggest that solely selecting low-pH cement to prevent montmorillonite dissolution may not be optimal, and the effects of secondary mineralization should be accounted for in disposal facility design.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107980"},"PeriodicalIF":5.8,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144885976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bio-based functionalization of halloysite nanotubes: Rheokinetics and surface modification with epoxidized linseed and soybean oils 高岭土纳米管的生物基功能化：流变动力学和环氧亚麻油和大豆油的表面改性

IF 5.8 2区地球科学

Applied Clay Science Pub Date : 2025-08-21 DOI: 10.1016/j.clay.2025.107979

Soheil Farshbaf Taghinezhad , Amin Abbasi , Golnoosh Abdeali , Mostafa Ahmadi , Daniel P. Fitzpatrick , Ian Major , Romina Pezzoli

{"title":"Bio-based functionalization of halloysite nanotubes: Rheokinetics and surface modification with epoxidized linseed and soybean oils","authors":"Soheil Farshbaf Taghinezhad , Amin Abbasi , Golnoosh Abdeali , Mostafa Ahmadi , Daniel P. Fitzpatrick , Ian Major , Romina Pezzoli","doi":"10.1016/j.clay.2025.107979","DOIUrl":"10.1016/j.clay.2025.107979","url":null,"abstract":"<div><div>Halloysite nanotubes (Hal) are among the most important fillers in the polymer industry; nonetheless, their incompatibility with hydrophobic polymers has been challenging. This study investigates the direct modification of Hal using epoxidized linseed oil (ELO) and epoxidized soybean oil (ESBO), focusing on the impact of reaction temperature on functionalization efficiency and kinetics. The chemical interaction between the oxirane groups in ELO and ESBO, and hydroxyl groups on the Hal was monitored using different techniques. Rheokinetics measurements demonstrated a significant increase in storage modulus with temperature, indicating the formation of a crosslinked network between Hal and oils. The reaction kinetics followed an Arrhenius-type behavior, with ESBO-modified Hal exhibiting a lower activation energy (15.50 kJ/mol) than ELO (16.06 kJ/mol). Chemical assessment confirmed a reduction in inner hydroxyl groups and an increase in carbonyl groups at elevated temperatures, while thermal studies revealed a progressive increase in mass loss, indicative of successful functionalization. Microscopy showed morphological changes in Hal upon modification with both oils, with ESBO depicting a higher reactivity despite its lower epoxy content. This study presents a novel approach to modifying Hal while highlighting the influence of temperature. These findings provide sustainable strategies for enhancing the performance of Hal-based polymer composites.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"277 ","pages":"Article 107979"},"PeriodicalIF":5.8,"publicationDate":"2025-08-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0