Applied Clay Science最新文献

{"title":"Interlayer cation effects on optical and dielectric properties of montmorillonite in terahertz frequency band","authors":"Lixian Hao ,&nbsp;Shusen Zhou ,&nbsp;Zhiyuan Zheng ,&nbsp;Chutong Gao ,&nbsp;Mingrui Zhang ,&nbsp;Tong Zhang ,&nbsp;Haochong Huang ,&nbsp;Bingcheng Luo ,&nbsp;Hao Liu","doi":"10.1016/j.clay.2025.107857","DOIUrl":"10.1016/j.clay.2025.107857","url":null,"abstract":"<div><div>This study investigates the optical and dielectric properties of montmorillonite through terahertz time-domain spectroscopy. The results reveal that the absorption coefficient, refractive index, dielectric constant, and conductivity increase with montmorillonite content. Notably, differences were observed between Na-type and Ca-type montmorillonite, particularly in dielectric constants, with Na-type exhibiting a stronger dielectric response. Additionally, humidity significantly affects these properties, with both optical and dielectric characteristics increasing with moisture content. Molecular dynamics simulations analyzed and compared self-diffusion coefficients and radial distributions of both montmorillonite types, revealing conductivity peaks at 0.59 (Na-type) and 0.44 (Ca-type), which are supporting experimental results. These findings suggest that montmorillonite type and humidity significantly influence their optical and dielectric properties, providing a framework for understanding montmorillonite behavior in the terahertz frequency range.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"274 ","pages":"Article 107857"},"PeriodicalIF":5.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936771","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}

{"title":"Water-in-water pickering emulsions stabilized by talc or kaolinite layered particles","authors":"Vitor Vianna de Souza Machado ,&nbsp;Bianca Hazt ,&nbsp;Anne Raquel Sotiles ,&nbsp;Rilton Alves de Freitas ,&nbsp;Fernando Wypych","doi":"10.1016/j.clay.2025.107858","DOIUrl":"10.1016/j.clay.2025.107858","url":null,"abstract":"<div><div>Kaolinite (Kaol) - Al₂Si₂O₅(OH)₄ and talc - Mg₃Si₄O₁₀(OH)₂ (Talc) are abundant clay minerals, with layered particles characterized by nanometric thicknesses and few micrometers in length. Such characteristics are interesting attributes when considering the stabilization of emulsions with low interfacial tension, like in water-in-water emulsions. Here, Kaol and Talc layered particles were characterized by several instrumental techniques. Then, we evaluated the effect of Kaol and Talc addition on water-in-water emulsions, formed by aqueous colloidal dispersions of amylopectin (AMP) and xyloglucan (XG) polymers. The emulsions were evaluated macroscopically and by means of droplet size distributions. The apparent contact angle (ACA) of a water droplet in atmospheric air was also measured on Kaol and Talc pressed pellets. Due to a larger droplet size (D50 = 2.01 ± 0.20 μm) when compared to Kaol (D50 = 0.34 ± 0.02 μm), Talc particles did not create complete coverage on the droplet surfaces. The droplets were also dragged down faster, increasing coalescence and the average droplet size after 24 h of preparation. In both cases, the difference in densities between the solids and the aqueous phases led to particle sedimentation, even when adsorbed to the interface of the droplets, generating a concentrated emulsion at the bottom of the flasks. While talc particles sedimented completely after 72 h, Kaol ones remained at the droplets interface, creating Pickering emulsions with enhanced stability.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"274 ","pages":"Article 107858"},"PeriodicalIF":5.3,"publicationDate":"2025-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143936770","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}

{"title":"Dimensional precision in DNA affinity by layered double hydroxides with length and size selectivity","authors":"Jing Xie ,&nbsp;Kyoung-Min Kim ,&nbsp;Jaehong Park ,&nbsp;Yoon Suk Kim ,&nbsp;Wooyong Park ,&nbsp;Byung Chul Jung ,&nbsp;Vidya Chandrabose ,&nbsp;Zubair Khalid ,&nbsp;Tae-il Kim ,&nbsp;Jae-Min Oh","doi":"10.1016/j.clay.2025.107852","DOIUrl":"10.1016/j.clay.2025.107852","url":null,"abstract":"<div><div>In this study, we demonstrated that deoxyribonucleic acid (DNA) strands selectively bind to the surfaces of size-customized layered double hydroxide (LDH) particles, driven by a distinct size-matching interaction between the adsorbate and adsorbent. High-purity LDHs with specific particle sizes – LDH-S (small) and LDH-L (large) – were synthesized, and their DNA adsorption behaviors were systematically examined. The LDH-S exhibited a higher specific surface energy and zeta potential than LDH-L; whereas LDH-L possessed a well-ordered crystalline structure along the crystallographic ab-plane compared to LDH-S. According to the adsorption isotherm, the DNA strands were adsorbed onto the LDH surface in a multilayer manner. The mathematical fitting indicated that LDH-S had a higher adsorption capacity and less cooperative adsorption than LDH-L. Electrophoresis using size-specific ladder DNA confirmed that LDH adsorbed DNA in a size-selective manner; ladder DNA below 800 base pairs selectively adsorbed on LDH-S, while DNA above 800 base pairs preferred adsorption on LDH-L. The binding assay using large plasmid DNA corroborated that LDH-L displayed superior adsorption efficiency for large DNA fragments. The distinctive preference of LDH-L for large DNA might be due to cooperative interactions among DNA strands on expansive surfaces with periodic electrostatic interaction sites.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107852"},"PeriodicalIF":5.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928874","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}

{"title":"Construction of hierarchically structured Bi2MoO6/g-C3N4/kaolinite S-scheme heterojunction photocatalyst for the efficient removal of formaldehyde and tetracycline under visible light","authors":"Yangyu Liu ,&nbsp;Lu Lu ,&nbsp;Arman Peyravi ,&nbsp;Zaher Hashisho ,&nbsp;Jun Zhao ,&nbsp;Xiaofei Hao ,&nbsp;Jiuyue Wang ,&nbsp;Hailong Zhang ,&nbsp;Xi Chen ,&nbsp;Shuilin Zheng ,&nbsp;Yuping Tong","doi":"10.1016/j.clay.2025.107854","DOIUrl":"10.1016/j.clay.2025.107854","url":null,"abstract":"<div><div>A novel hierarchically structured Bi₂MoO₆/g-C₃N₄/kaolinite ternary S-scheme heterojunction photocatalyst was synthesized by a simple calcination crystallization and solvothermal method, with exfoliated kaolinite as the carrier. Detailed analysis of the structure and morphology of the composite was conducted through a series of characterization techniques. The results indicate that the incorporation of kaolinite notably enhanced the photocatalytic performance of the composite. Kaolinite not only acts as a carrier, providing a high specific surface area and abundant adsorption sites, but also facilitates the migration and separation of photogenerated carriers through its unique layered structure and surface chemical properties. Consequently, this ternary composite exhibits excellent degradation performance towards tetracycline and formaldehyde under visible light irradiation, with reaction rate constants that are 15.5 times and 8.05 times higher than that of pure g-C₃N₄, respectively. Radical scavenger experiments reveal that hydroxyl radical (•OH) is the primary active specie. Finally, we discuss the synergistic mechanism of kaolinite in the composite, including its enhancement of light capture ability, improvement of charge separation efficiency, and promotion of active species generation. Overall, this study provides new insights for developing highly efficient and stable kaolinite-based visible-light-driven materials for environmental remediation.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107854"},"PeriodicalIF":5.3,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143928873","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}

{"title":"Montmorillonite enhances the remediation of lead (II) by polyvinyl alcohol/sodium alginate/Chlorella sorokiniana FK microcapsules","authors":"Zijia Zhang ,&nbsp;Keqiang Zhou ,&nbsp;J. Viridiana Garcia-Meza ,&nbsp;Shaoxian Song ,&nbsp;Ling Xia","doi":"10.1016/j.clay.2025.107847","DOIUrl":"10.1016/j.clay.2025.107847","url":null,"abstract":"<div><div>Microbial remediation of heavy metals has attracted more and more attention because of its cleanliness and high efficiency. In this study, montmorillonite was used in coordination with polyvinyl alcohol and sodium alginate to prepare a new microcapsule of living <em>Chlorella sorokiniana</em> FK, and its remediation effect on Pb(II) was investigated. The results showed that the introduction of montmorillonite enhanced the mechanical strength of microcapsules and the removal efficiency of Pb(II) (100 %). The staining results of live/dead cells further indicated that the introduction of montmorillonite can more effectively help <em>Chlorella sorokiniana</em> FK in microcapsules resist lead stress. In addition, the characterization results proved that microcapsules can concentrate Pb(II) on the surface through electrostatic attraction, surface complexation, and ion exchange, and then transform them into mineralized precipitates (Pb₅(PO₄)₃Cl and Pb₃(CO₃)₂(OH)₂) through the surface precipitation and induced carbonate precipitation of internal microalgae. It is worth noting that pot experiments have shown that the prepared microcapsules can more effectively reduce the bioavailability of lead and improve the structure and function of microbial communities. This study indicates that the prepared microcapsules have great potential for application in heavy metals remediation.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107847"},"PeriodicalIF":5.3,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143902419","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}

{"title":"Yeast-activated carbon/montmorillonite nanosheets with porous spherical shells for efficient tetracycline degradation","authors":"Liming Wu ,&nbsp;Zhongyu Su ,&nbsp;Jinzhou Fan ,&nbsp;Daoguang Teng ,&nbsp;Weijun Peng ,&nbsp;Wei Wang ,&nbsp;Yijun Cao","doi":"10.1016/j.clay.2025.107846","DOIUrl":"10.1016/j.clay.2025.107846","url":null,"abstract":"<div><div>A bio-derived carbon composite catalyst was successfully prepared by loading yeast onto the assembled montmorillonite nanosheets (MMTNS-L), followed by calcination, which effectively prevented catalyst aggregation. MMTNS assembled in a two-dimensional direction to form large sheets, providing a robust support structure. After carbonization, yeast cells, as natural biological entities rich in nitrogen, exhibited a distinctive hollow thin-layer spherical shell with a large specific surface area and abundant pores. The evaporation of internal water vapor further contributed to the formation of this porous structure. The spherical shells uniformly distribute on the assembled MMTNs, resisting aggregation and exposing more active sites, which enhances the catalyst's efficiency. The pyridine N and pyrrole N formed after carbonization provide additional active sites to facilitate electron transfer, while the stable graphite N and N<img>O enhance the catalyst's stability and promote the non-radicals generation. During the degradation process, potassium peroxymonosulfate (PMS) was introduced and activated by the catalyst, generating both free and non-free radicals to effectively degrade tetracycline (TC). Under optimal conditions, the assembly of MMTNS with a lamellar structure, followed by high-temperature yeast carbonization, achieved an 84 % TC degradation rate within 15 min. In this process, <span><math><mo>•</mo><msubsup><mi>SO</mi><mn>4</mn><mo>–</mo></msubsup></math></span>, <span><math><mo>•</mo><msubsup><mi>O</mi><mn>2</mn><mo>–</mo></msubsup></math></span>, and ¹O₂ all participated in TC degradation, with ¹O₂ being the dominant reactive species. As a highly reactive non-radical, ¹O₂ interacts with organic matter to facilitate its degradation. This structure significantly enhances photocatalytic performance and shows great potential for antibiotic removal. This technique aims to enhance the exposure of active sites on carbonized yeast and improve the catalyst's stability, thereby supporting the efficient treatment of antibiotic wastewater and the application of biocarbon catalytic materials.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107846"},"PeriodicalIF":5.3,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143894612","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}

{"title":"Enhancing soil organic carbon fixation with modified bentonite composites","authors":"Bing Liu ,&nbsp;Yuwen Shen ,&nbsp;Deshui Tan ,&nbsp;Bohan Cheng ,&nbsp;Haitao Lin ,&nbsp;Rui Xue ,&nbsp;Zongxin Li ,&nbsp;Qiang Yao ,&nbsp;Shuying Jiao","doi":"10.1016/j.clay.2025.107837","DOIUrl":"10.1016/j.clay.2025.107837","url":null,"abstract":"<div><div>Modified bentonite composites (Fe-CTAB modified bentonite) were synthesized by intercalating cetyl trimethyl ammonium bromide (CTAB) into the interlayer spaces of raw bentonite, followed by the embedding of iron oxide. The structural and physicochemical characteristics of the modified bentonite were characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA), and zeta potential measurements. Our findings indicated that the modified bentonite exhibited a larger interlayer distance due to the introduction of CTAB, and the surface charge transitioned from negative to positive. The adsorption capacity of the Fe-CTAB modified bentonite for fulvic acid (FA) in an aqueous solution reached 368.4 mg/g, which was an increase of 2150 % compared to raw bentonite. In soil incubation experiments, the soil organic carbon content exhibited a 32.2 % decline in the FA treatment relative to the Fe-CTAB modified bentonite with FA treatment. The higher soil organic carbon sequestration in the treatment combining FA with Fe-CTAB modified bentonite led to increased biomass of crops.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107837"},"PeriodicalIF":5.3,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143887673","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}

{"title":"Effects of compaction and ionic strength on cation exchange selectivity coefficients of Ca(II), Mg(II), and K(I) for Na(I) in bentonite","authors":"Ryo Yasuda ,&nbsp;Shingo Tanaka ,&nbsp;Daisuke Hayashi ,&nbsp;Tomoko Ishii ,&nbsp;Yukinobu Kimura ,&nbsp;Tsuneyuki Maemura ,&nbsp;Hitoshi Owada","doi":"10.1016/j.clay.2025.107836","DOIUrl":"10.1016/j.clay.2025.107836","url":null,"abstract":"<div><div>Cation exchange selectivity coefficients of bentonite are crucial for estimating cation compositions of bentonite buffer in the geological disposal of radioactive wastes. For confirming the difference in selectivity coefficients of Ca(II), Mg(II), and K(I) for Na(I) between compacted and dispersed bentonite, column and batch experiments were performed under various ionic strengths. Further, as an applied study, a column experiment was performed using coastal groundwater (ionic strength 0.28 M), and the cation compositions of bentonite after the experiment were numerically simulated using selectivity coefficients for the compacted and dispersed states. The experimental results showed that the selectivity coefficients in the compacted state were higher than those in the dispersed state, and they increased slightly with increasing ionic strength in both states. The numerical simulations agree with the experimental results of cation composition after the column experiment when using the selectivity coefficients determined under the compacted state at the ionic strength of 0.25 M. These results suggest that the selectivity coefficients obtained under the compacted state are preferable for predicting the cation composition of compacted bentonite, especially in saline groundwater environments.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107836"},"PeriodicalIF":5.3,"publicationDate":"2025-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143879165","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}

{"title":"Anti-disintegration property of red soil treated with building gypsum powder","authors":"Yinlei Sun ,&nbsp;Zhen Li ,&nbsp;Xuan-Chen Lin ,&nbsp;Qing-Ru Du ,&nbsp;Xi Zou ,&nbsp;Xianwei Zhang","doi":"10.1016/j.clay.2025.107832","DOIUrl":"10.1016/j.clay.2025.107832","url":null,"abstract":"<div><div>Red soil exhibits a tendency to soften and disintegrate upon exposure to water, posing significant geological hazards and engineering challenges. In the present study, building gypsum powder (BGP) was employed as a modifier to systematically investigate its influence on the resistance to disintegration of red soil under the influence of various alkaline admixtures. Utilizing a custom-built dry-wet cycle disintegration tester, in conjunction with microscopic analysis techniques including scanning electron microscopy (SEM), X-ray diffraction (XRD), XRF (X-ray Fluorescence) and mercury intrusion porosimetry (MIP), the enhancement mechanism of BGP on the microstructure of red soil was thoroughly investigated. The findings indicate that an increase in the dosage of BGP markedly enhances the resistance to disintegration of red soil, particularly when the dosage surpasses 5 %. Under the influence of various admixtures, BGP-modified red soil undergoes chemical processes, including ion exchange, crystallization, and volcanic ash reaction, leading to a significant reduction in porosity, an increase in density, and a marked improvement in the water stability of red soil. The dry-wet cycle test provided further confirmation that the admixture markedly improved the water stability of BGP-modified red soil. Furthermore, the quantitative relationship between the microstructural parameters of the modified red soil and its disintegration properties was established through the application of grey correlation analysis and fractal theory, elucidating the crucial role of pore perimeter and area in the resistance to disintegration of red soil. This research endeavors to establish a scientific foundation for the prevention and mitigation of debris flows, landslides, and other disasters in red soil regions, and to propose novel strategies for the selection of geotechnical enhancement materials.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107832"},"PeriodicalIF":5.3,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143874435","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}

{"title":"Triplet-triplet annihilation up-conversion of cationic iridium(III) complex solubilized by organically-modified hectorite in a green solvent","authors":"Akihiko Yamagishi ,&nbsp;Kazuyoshi Takimoto ,&nbsp;Risa Ito ,&nbsp;Jun Yoshida ,&nbsp;Hisako Sato","doi":"10.1016/j.clay.2025.107828","DOIUrl":"10.1016/j.clay.2025.107828","url":null,"abstract":"<div><div>A cationic Ir (III) complex, [Ir(bzq)₂(phen)]⁺ (bzqH = benzo[<em>h</em>]quinoline; phen = 1,10-phenanthroline), was bound to colloidal particles of synthetic saponite (SAP) in 2:2:0.05 (v/v) methanol/dichloromethane/water. Upon the addition of 9,10-diphenylanthracne (DPA), the initial emission peak around 580 nm decreased with the simultaneous appearance of an emission peak at approximately 430 nm. These results implied that the Ir(III) complex as a donor achieved triplet-triplet annihilation up-conversion (TTA-UC) of the photon energy in DPA under air. The quantum yield was enhanced by hybridization with SAP. TTA-UC was also realized in an aprotic solvent mixture of 1:1 (v/v) toluene/<em>R</em>-limonene when the Ir (III) complex was solubilized using organically-modified hectorite. The utility of clay minerals for efficient energy up-conversion in a green solvent was demonstrated.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"272 ","pages":"Article 107828"},"PeriodicalIF":5.3,"publicationDate":"2025-04-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143858892","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}