Applied Clay Science最新文献

{"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":"Ternary hybrid nanocomposites based on polypyrrole/manganese dioxide/palygorskite clay for electrochemical supercapacitor applications","authors":"Carlos Bellaner Díaz-Arriaga ,&nbsp;Luis Santiago Solís-Méndez ,&nbsp;José Martin Baas-López ,&nbsp;Daniella Esperanza Pacheco-Catalán ,&nbsp;Jorge Alonso Uribe-Calderón","doi":"10.1016/j.clay.2025.107826","DOIUrl":"10.1016/j.clay.2025.107826","url":null,"abstract":"<div><div>Ternary nanocomposites containing polypyrrole (PPy), manganese dioxide (MnO₂), and two distinct acid-treated palygorskite (Pal) clays were prepared by in situ chemical oxidative polymerization for electrochemical supercapacitor applications. The resulting composites were fully characterized in terms of structure, morphology, and electrochemical properties. MnO₂ nanorods were hydrothermal synthesized, while natural Pal clay was modified by two sequential acid treatments not only for clay purification but also to increase its specific surface area and porosity. The Pal clay was initially treated with a 1 M HCl solution, designated as Pal1, and subsequently treated with a 5 M H₂SO₄ solution to yield Pal2. Pal clay was incorporated in order to increase the dimensional stability during the doping-dedoping process. Two ternary nanocomposites, designated as PMP1 and PMP2 were formed through in-situ polymerization of pyrrole on Pal1/MnO₂ or Pal2/MnO₂ mixtures, respectively. The ternary electrodes exhibited a notable enhancement in the cycle life of the supercapacitors due to the incorporation of acid-treated clays, retaining up to 98 % of their initial capacitance after 1600 charge-discharge cycles. In contrast, the device containing PPy/MnO₂ electrodes (PM) retained only 78 % of its initial capacitance. Furthermore, the highest specific capacitance of 205 mF cm⁻² at 3 mA cm⁻² was obtained for the PMP1 supercapacitor by the GCD method, which delivered a maximum energy density of 13 mW h cm⁻² with a power density of 335 mW cm⁻². These results demonstrate for the first time the potential application of acid-treated Pal clays in improving cycle stability of the PPy/MnO₂ electrode materials. This approach could also be adapted for other types of binary electrode materials.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107826"},"PeriodicalIF":5.3,"publicationDate":"2025-04-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143877482","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":"One-step synthesis of CdS-CeO2/sepiolite and its efficient removal of Rhodamine B by synergistic adsorption and photocatalysis","authors":"Yan Zhang ,&nbsp;Xinhui Huang ,&nbsp;Yaxue Zhang ,&nbsp;Letian Lv ,&nbsp;Chengyuan Su ,&nbsp;Shu Gao ,&nbsp;Zhi Huang ,&nbsp;Menglin Chen ,&nbsp;Xianfeng Lin","doi":"10.1016/j.clay.2025.107831","DOIUrl":"10.1016/j.clay.2025.107831","url":null,"abstract":"<div><div>We prepare CdS-CeO₂/sepiolite materials in a one-step process and characterize their structural, morphological, and optical properties. CdS-CeO₂/sepiolite displays enhanced adsorption of the environmentally hazardous dye Rhodamine B (RhB), up to 34.92 mg/g. Harnessing synergy between adsorption and photocatalysis, CdS-CeO₂/sepiolite removes 98.57 % of RhB from solution after 150 min of visible light illumination and is robust to a wide pH range. Quenching experiments and electron spin resonance (ESR) indicates that singlet oxygen and holes are the main reactive groups during photocatalytic degradation. CdS and CeO₂ hinder the recombination of photogenerated electron-hole pairs, accelerate charge transfer, and enhance visible light absorption. These CdS-CeO₂/sepiolite materials have potential application in the efficient photodegradation of dye in a wide range of pH.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"273 ","pages":"Article 107831"},"PeriodicalIF":5.3,"publicationDate":"2025-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143864971","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}

{"title":"Clinker-free binder based on kaolinite-rich coal gangue powder, slag, calcium carbide residue and soda desulfurization residue: Rheology, mechanical performance and hydration property","authors":"Xiaochuan Xu ,&nbsp;Yunqi Zhao ,&nbsp;Xiaowei Gu ,&nbsp;Junchen Xiang","doi":"10.1016/j.clay.2025.107833","DOIUrl":"10.1016/j.clay.2025.107833","url":null,"abstract":"<div><div>Ordinary cement is often reported to cause high carbon emission, and it is essential to develop an ecological and high performance binder. This study introduced a new clinker-free binder performing excellent mechanical performance. Calcium carbide residue (CCR) and soda desulfurization residue (SDSR) were invited as activators, and ground granulated blast-furnace slag (GBFS) with calcined coal gangue powder (CCGP) were treated as precursors. The rheological, mechanical and hydration properties of pastes were investigated respectively. The results showed that the rheological properties of pastes fitted well with Herschel-Bulkley model and exhibited shear thinning behavior. The incorporation of CCGP increases the yield stress and inhibits shear thinning phenomenon. The compressive strengths indicated that the optimal CCGP content was 20 wt%, and its incorporation restricted hydration reaction rate and autogenous shrinkage, resulting in a denser microstructure. Metakaolin within CCGP produced typical hydration products of ettringite, C-A-S-H and N-A-S-H, and prompted hydration reaction from alkali activated materials to geopolymer cement. This study reported a clinker-free binder utilizing solid wastes and confirmed its feasibility in construction applications.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"272 ","pages":"Article 107833"},"PeriodicalIF":5.3,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143854941","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":"Key impact of pretreatment for support coal gangue on pollutants removal efficiencies: Insight to the divergence for peroxymonosulfate activation and adsorption behavior","authors":"Pengfei Zhang,&nbsp;Hao Zhang,&nbsp;Xin Yan,&nbsp;Chunfang Du","doi":"10.1016/j.clay.2025.107835","DOIUrl":"10.1016/j.clay.2025.107835","url":null,"abstract":"<div><div>Coal gangue (CG), the by-product of coal mining and washing, not only monopolizes land resources, but also poses extreme environmental issues. In this work, original CG and CG with pretreatment (CG^⁎) were used as supports to construct the composites CuO/CG and CuO/CG^⁎ for the removal of antibiotics. The matrix (CG or CG^⁎) had a significant impact on the removal efficiencies of the final composites. The optimal CuO/CG composite exhibited about 80 % degradation efficiency toward sulfamethoxazole (SMX) within 10 min in the presence of peroxymonosulfate (PMS), which was about 1.57 times as that of pristine CuO and about 20 % superior than those of CuO/CG^⁎ composites. The optimal CuO/CG^⁎ composite exhibited 90 % of adsorption efficiency toward tetracycline hydrochloride (TC) within 40 min, which was about 6 times that of pristine CuO and 1.5 times that of CG^⁎-500. The mechanism studies indicated that the discrepancy in surface charges resulted in the different catalytic performance of CuO/CG and CuO/CG^⁎. Moreover, the various adsorption efficiencies of CuO/CG and CuO/CG^⁎ were related to the discrepant specific surface area of these two composites. This work provided two excellent composites for removing pollutants from wastewater, especially paid attention to the effect of pretreatment for supports on the removal performance.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"272 ","pages":"Article 107835"},"PeriodicalIF":5.3,"publicationDate":"2025-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143854942","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":"Self-healing clay-polymer composite hydrogel obtained by evaporation induced cross-linking and subsequent anisotropic swelling","authors":"Siriluck (Puey) Thongsamakphan ,&nbsp;Lisa Goulvestre ,&nbsp;Ploypailin (Milin) Saengdet ,&nbsp;Makoto Ogawa","doi":"10.1016/j.clay.2025.107815","DOIUrl":"10.1016/j.clay.2025.107815","url":null,"abstract":"<div><div>Thanks to the dispersibility of smectite and solubility of poly(vinyl alcohol) (PVA) as well as the biocompatibility of both components, smectite-PVA composites have been examined for various applications. A synthetic hectorite (Sumecton SWF)-PVA sheet was obtained by a drying of an aqueous mixture of the components at room temperature. Cross-linking of PVA was achieved during the evaporation of solvent (evaporation-induced cross-linking). The sheet was immersed in water to obtain a hydrogel sheet. Based on the unique anisotropic swelling of the present hydrogel, the self-healing induced by water of the hydrogel was achieved. The healing was done within 3 s. The SWF-PVA hydrogel composite, prepared by using the novel cross-linking method, exhibited anisotropic swelling and water-induced self-healing.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"272 ","pages":"Article 107815"},"PeriodicalIF":5.3,"publicationDate":"2025-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143848039","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}