Applied Clay Science最新文献_第3页

Mechanical activation of kaolinite for sodalite synthesis under mild conditions 温和条件下高岭石机械活化合成钠石

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-27 DOI: 10.1016/j.clay.2025.107796

Yi Liu, Baifa Zhang, Mohammad Fahimizadeh, Ting Yu, Zhou Ou, Zhineng Peng, Peng Yuan

{"title":"Mechanical activation of kaolinite for sodalite synthesis under mild conditions","authors":"Yi Liu, Baifa Zhang, Mohammad Fahimizadeh, Ting Yu, Zhou Ou, Zhineng Peng, Peng Yuan","doi":"10.1016/j.clay.2025.107796","DOIUrl":"10.1016/j.clay.2025.107796","url":null,"abstract":"<div><div>This study investigated the effects of mechanical activation on the transformation of kaolinite to sodalite under mild conditions. The sodalite prepared via alkaline leaching of kaolinite under different milling times, alkaline concentrations, and leaching times was studied. The prepared zeolites were physically, chemically, and morphologically characterized. The results show that ball milling can significantly reduce the particle size and increase the specific surface area of kaolinite. Highly crystalline sodalite (Na<sub>8</sub>Al<sub>6</sub>Si<sub>6</sub>O<sub>24</sub>(OH)<sub>2</sub>) can be prepared from kaolinite with ball milling for 2 h after alkaline leaching at 6 M NaOH for 24 h. Ball milling destroyed the crystal lattice of kaolinite, generating structural defects and dislocations, destabilizing the framework of kaolinite and increasing its reactivity. Furthermore, mechanically activated kaolinite demonstrated a hybrid transformation under alkaline leaching, involving both direct transformation (kaolinite → sodalite) and a two-step transformation (kaolinite → zeolite A → sodalite), depending on the dehydroxylation degree. The complete dehydroxylation of kaolinite induced a two-step transformation under alkaline leaching, as the thermally activated kaolinite did. Kaolinite was directly transformed into sodalite under alkaline conditions (≥ 4 M NaOH), exhibiting heterogeneous nucleation on the surface of kaolinite. Interestingly, the conversion of zeolite A into sodalite required a higher alkaline concentration for the thermal activation of kaolinite under atmospheric pressure, reflecting the advantages of mechanical activation. Mechanical activation can reduce the alkaline concentration required for the preparation of sodalite from kaolinite despite the conversion route, indicating that the preparation of sodalite can be completed under mild conditions.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107796"},"PeriodicalIF":5.3,"publicationDate":"2025-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143714632","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

Modulation of the pyrolysis of ZIF-67 by kaolinite for highly efficient peroxymonosulfate activation 高岭石对ZIF-67热解高效过氧单硫酸盐活化的调控

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-26 DOI: 10.1016/j.clay.2025.107798

Yan Mo , Weiwei Yin , Chenhui Long , Chao Gao , Qihang Zhao

{"title":"Modulation of the pyrolysis of ZIF-67 by kaolinite for highly efficient peroxymonosulfate activation","authors":"Yan Mo , Weiwei Yin , Chenhui Long , Chao Gao , Qihang Zhao","doi":"10.1016/j.clay.2025.107798","DOIUrl":"10.1016/j.clay.2025.107798","url":null,"abstract":"<div><div>The persistent challenge of organic pollutant remediation drives the development of sulfate radical-based advanced oxidation processes, where heterogeneous cobalt-based catalysts face critical stability limitations. To address this, we rationally designed kaolinite-supported carbon-coated cobalt composites through calcination of ZIF-67/Kaol precursors, achieving enhanced peroxymonosulfate (PMS) activation for atrazine degradation. The engineered catalyst combines lamellar structure and active surface groups of kaolinite with ZIF-67-derived nitrogen-doped carbon frameworks, exhibiting exceptional catalytic performance. Mechanistic studies reveal singlet oxygen as the exclusive reactive species, with nitrogen doping in the carbon matrix substantially enhancing charge density and electron transfer efficiency. The carbon coating facilitates electron redistribution while protecting active cobalt sites, enabling sustained catalytic cycles. This work establishes a materials design paradigm combining mineral support engineering with metal-organic framework derivation strategies, demonstrating significant potential for developing robust PMS activation systems in water remediation applications.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107798"},"PeriodicalIF":5.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697104","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

Surfactants aided bleaching of raw kaolin and production of delaminated nano clays via sequential milling 表面活性剂辅助漂白原料高岭土和生产分层纳米粘土通过顺序碾磨

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-26 DOI: 10.1016/j.clay.2025.107794

R. Rakesh , T.M. Ragi , Angitha Francy , A. Peer Mohamed , S. Ananthakumar

{"title":"Surfactants aided bleaching of raw kaolin and production of delaminated nano clays via sequential milling","authors":"R. Rakesh , T.M. Ragi , Angitha Francy , A. Peer Mohamed , S. Ananthakumar","doi":"10.1016/j.clay.2025.107794","DOIUrl":"10.1016/j.clay.2025.107794","url":null,"abstract":"<div><div>Industrial surfactants possessing specific functional groups are better known for obtaining stable clay dispersions. However, the effect of surfactants on the bleaching of kaolin clays during mechanical milling has not yet been studied. In this work, surfactants-assisted bleaching of kaolin clays was investigated through sequential milling (up to 3 stages) to develop an acid-free, water-based green-bleaching process. The aim of this work was to screen the surfactants that offer insitu bleaching thereby improving the brightness without any reductive bleaching using sodium dithionate, and directly produce size-controlled nano-clay particles. Kaolin clays of Indian origin were subjected to mechano-chemical bleaching via planetary milling in the presence of cationic, anionic, and polymeric surfactants in aqueous medium at neutral pH and 300 rpm for 10 min duration. The bleaching efficiency was monitored carefully by noting the color index properties. The end-products were also analyzed for the powder XRD, XRF, Near IR, color coordinates and morphology. The results confirmed that the three-stage mechanical-milling is effective in bleaching of kaolin clays when surfactants like Sodium Dodecyl Sulfate (SDS), commercially known as Sodium Lauryl Sulfate (SLS), is employed. The L* value of kaolin clay is enhanced from 83 to 90 and the b* value decreased from 12.47 to 1.98 in these surfactants. The SEM and TEM analyzes revealed that the mechano-chemical milling was also favoring the delamination of the kaolin clay booklets to produce nano-kaolin. Hence the technique is two-in-one to successfully produce optically bright, highly dispersible, IR reflective, kaolin nano-platelets through green-strategy.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107794"},"PeriodicalIF":5.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697103","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

Accelerating of Fe3+/Fe2+ redox cycle using palygorskite as phase regulator for peroxymonosulfate oxidation 坡缕石作为过氧单硫酸盐氧化相调节器加速Fe3+/Fe2+氧化还原循环

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-26 DOI: 10.1016/j.clay.2025.107790

Yunhui Tian, Shilin Li, Guangxin Zhang

{"title":"Accelerating of Fe3+/Fe2+ redox cycle using palygorskite as phase regulator for peroxymonosulfate oxidation","authors":"Yunhui Tian, Shilin Li, Guangxin Zhang","doi":"10.1016/j.clay.2025.107790","DOIUrl":"10.1016/j.clay.2025.107790","url":null,"abstract":"<div><div>This study presents the synthesis of a Fe-based catalyst via a one-pot calcination method, emphasizing the role of palygorskite (Pal) in modifying the catalyst's phase composition. The incorporation of palygorskite led to a robust interaction with FeOCl and FeCl<sub>2</sub>, resulting in a porous structure enriched with active sites. The prepared catalyst had high surface area (69.1 m<sup>2</sup>/g) and pore volume (0.167 cm<sup>3</sup>/g) with interwoven rod-like structure. These characteristics were essential for enhancing the activation of peroxymonosulfate (PMS). Textile wastewater is one of the main sources of industrial wastewater in China, and RhB is one of the commonly used dyes in textile industry. The performance of the synthesized Fe/Pal catalyst was evaluated in the context of degrading Rhodamine B (RhB). The catalyst exhibited remarkable efficacy attributed to the dynamic Fe<sup>3+</sup>/Fe<sup>2+</sup> redox cycle. Under optimized conditions, 0.1 g/L activated catalyst can remove 85 % RhB within 10 min. Quenching experiments further elucidated the mechanisms involved in pollutant removal, revealing that sulfate radicals and singlet oxygen were the predominant reactive species. Overall, the findings underscored the potential of iron/mineral matrix composite catalysts in the effective treatment of organic pollutants. This research not only advances the understanding of catalyst design but also offers promising pathways for the broader application of these materials in environmental remediation efforts.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107790"},"PeriodicalIF":5.3,"publicationDate":"2025-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143697105","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

Paraffin@Hectorite-SiO2/Fe3O4 microcapsule phase change fluid for efficient photothermal energy storage and heat dissipation Paraffin@Hectorite-SiO2/Fe3O4微胶囊相变流体用于高效光热储能和散热

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-23 DOI: 10.1016/j.clay.2025.107797

Huanyu Zhu , Minghui Li , Hao Yi , Feifei Jia , Jinyue Xu , Shaoxian Song

{"title":"Paraffin@Hectorite-SiO2/Fe3O4 microcapsule phase change fluid for efficient photothermal energy storage and heat dissipation","authors":"Huanyu Zhu , Minghui Li , Hao Yi , Feifei Jia , Jinyue Xu , Shaoxian Song","doi":"10.1016/j.clay.2025.107797","DOIUrl":"10.1016/j.clay.2025.107797","url":null,"abstract":"<div><div>Suspension stability and thermal conductivity are crucial for enhancing the heat dissipation efficiency of latent heat fluid. In this work, Paraffin@Hectorite-SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> phase change microcapsule based on paraffin core and hectorite/SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub> composite shell was designed and fabricated using Pickering method, and it was dispersed into water to obtain latent heat fluid. DSC analysis indicated that the latent heat storage capacity of MPCM was 170.44 J/g with the 69.34 % encapsulation ratio. TGA analysis demonstrated that composite shell structure improved the thermal stability of paraffin. Heat dissipation tests indicated that the heat dissipation efficiency of Paraffin@Hectorite-SiO<sub>2</sub>/Fe<sub>3</sub>O<sub>4</sub>-Water LHF were improved by 22.9 % compared with pure water, and the fluid could keep suspended at least 30 days. The introduction of Fe<sub>3</sub>O<sub>4</sub> on shell structure enhanced the light absorption rate and the surface temperature could raise to 55.1 °C after exposure to sunlight for 15 min. The resultant LHF has a promising potential for applications in heat dissipation and solar energy storage.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107797"},"PeriodicalIF":5.3,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682815","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

Molecular-scale insights into retention and aggregation of organophosphate esters (OPEs) with clay-organic complexes 有机磷酯（OPEs）与粘土-有机配合物的保留和聚集的分子尺度见解

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-23 DOI: 10.1016/j.clay.2025.107795

Zhiyu Zhou , Chi Zhang , Haozhe Ma , Weili Lu , Hui Wang , Jiping Chen , Mengning Xi , Hanzhong Jia

{"title":"Molecular-scale insights into retention and aggregation of organophosphate esters (OPEs) with clay-organic complexes","authors":"Zhiyu Zhou , Chi Zhang , Haozhe Ma , Weili Lu , Hui Wang , Jiping Chen , Mengning Xi , Hanzhong Jia","doi":"10.1016/j.clay.2025.107795","DOIUrl":"10.1016/j.clay.2025.107795","url":null,"abstract":"<div><div>Clay-organic complexes, as the major substrate in surface environment, play an essential role in the retention of organophosphate esters (OPEs). Due to the complexity and heterogeneity of clay-organic aggregates, the molecular-level understanding of the interactions between OPEs and clay-organics has not been elucidated. This work systematically investigates the dynamic retention and aggregation behavior of three types of OPEs (TBEP, TCEP and TCP) with kaolinite-organic complexes by molecular dynamic (MD) simulations and density function theory (DFT) calculations. Flexible (SRFA) and rigid (WFA) molecular structures of organic matters are considered. Results demonstrate that both SRFA and WFA can act as bridges to connect the hydroxyl surface of kaolinite and OPE aggregates. The flexible SRFAs tend to fold themselves, thereby providing hydrophobic sites for OPEs. The aggregates of WFA are divided into several parts and attach to outer surface of the OPE polymers, as the rigid WFA cannot undergo conformational changes. According to DFT results, OPE oligomerization is primarily driven by vdW interaction attributed to their typical hydrophobic nature, supplemented by weak electrostatic forces from minor hydrophilic moieties. This work reveals that the transport and bioavailability of OPEs are significantly reduced by forming OPE-NOM-kaolinite co-aggregates, and provides a quantitative understanding of the environmental processes of OPEs at the molecular and electronic scales.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107795"},"PeriodicalIF":5.3,"publicationDate":"2025-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682814","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

An acid-free short-flow process for high-quality separation of kaolinite in coal waste rock: Based on mineralogical determinations 煤废岩中高岭石高质量分离的无酸短流工艺：基于矿物学测定

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-22 DOI: 10.1016/j.clay.2025.107792

Chengwen Wang , Yanxiu Wang , Wei Sun , Runqing Liu , Le Tao , Anqi Yang , Shipei Wang

{"title":"An acid-free short-flow process for high-quality separation of kaolinite in coal waste rock: Based on mineralogical determinations","authors":"Chengwen Wang , Yanxiu Wang , Wei Sun , Runqing Liu , Le Tao , Anqi Yang , Shipei Wang","doi":"10.1016/j.clay.2025.107792","DOIUrl":"10.1016/j.clay.2025.107792","url":null,"abstract":"<div><div>Coal waste rock (coal gangue), as a traditional industrial solid waste, is of great significance to resource recycling and environmental pollution reduction through scientific planning and classification separation. Herein, an acid-free short-flow process for purifying kaolinite from coal gangue was innovatively proposed based on the analysis of the mineral composition. The fine-grained pyrite in the coal gangue was transformed into hematite (Fe<sub>2</sub>O<sub>3</sub>) through the pretreatment of low-temperature air roasting, creating enhanced conditions for magnetic separation. Thermodynamic calculations showed that hematite can be stabilized as an independent phase in the kaolinite system, reducing the loss of kaolinite in the separation process. The effects of single-factor tests such as roasting temperature, magnetic separation conditions, grinding fineness, and whitening agent dosage on the purified samples were studied. Under the optimal conditions, a purified product with a yield of 90.28 %, a SiO<sub>2</sub> content of 50.09 %, an Al<sub>2</sub>O<sub>3</sub> content of 45.41 %, a Fe<sub>2</sub>O<sub>3</sub> content of 0.34 %, a TiO<sub>2</sub> content of 1.34 %, and a whiteness of 88.71 % could be obtained. Economical estimates suggested that the revenue from process operation is approximately 538.34 CNY/t (73.07 $/t). This simple and easy-to-operate process flow provides new insights into the classification and utilization of coal gangue.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107792"},"PeriodicalIF":5.3,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682812","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

Rheological behaviour and printability optimization of geopolymer ink for direct ink writing 直墨书写用地聚合物油墨的流变特性及印刷性能优化

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-22 DOI: 10.1016/j.clay.2025.107791

Shabnam Siddiqui , Yalachigere Kempaiah Suneetha , Raghu Raja Pandiyan Kuppusamy , Srinath Suranani

{"title":"Rheological behaviour and printability optimization of geopolymer ink for direct ink writing","authors":"Shabnam Siddiqui , Yalachigere Kempaiah Suneetha , Raghu Raja Pandiyan Kuppusamy , Srinath Suranani","doi":"10.1016/j.clay.2025.107791","DOIUrl":"10.1016/j.clay.2025.107791","url":null,"abstract":"<div><div>This study focuses on developing a metakaolin-based geopolymer ink tailored for the Direct Ink Writing (DIW) technique, emphasizing optimizing rheological properties to achieve extrusion and shape retention. Three rheological modifiers, Xanthan gum, Triton X 100, and PEG 400, were evaluated to determine the parameters necessary for effective printing. Additionally, H₂O₂ was incorporated as a foaming agent to enhance the material's porosity. A significant challenge in this process was managing the ongoing polycondensation reactions, which continuously altered the ink's rheological behaviour. The geopolymer slurry was formulated using metakaolin and an alkaline activator with an optimized activator-to-metakaolin ratio of 1.25. Xanthan gum was identified as the most effective additive, creating a viscoelastic network that enabled the required shear-thinning behaviour, where the viscosity decreases during extrusion and rapidly recovers post-extrusion. This behaviour ensured precise printability while maintaining shape integrity. Key parameters were established for optimal printing performance: a nozzle diameter of 0.84 mm, a printing speed of 5 mm/s, and a layer height of 0.6 mm. Maintaining print quality during a holding time of up to 90 min required fine-tuning the ink dispensing rate. These findings underscore the importance of rheological characterization in addressing the challenges and enabling the design of high-performance Geopolymer ink for DIW applications.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107791"},"PeriodicalIF":5.3,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682813","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

Enhanced stabilisation of simulant organic nuclear wastes in metakaolin-based geopolymers using graphene oxide 利用氧化石墨烯增强偏高岭土聚合物中模拟有机核废料的稳定性

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-20 DOI: 10.1016/j.clay.2025.107793

Sivasubramaniam Seralathan, Xiaobo Niu, Yogarajah Elakneswaran, Chewei Fang

{"title":"Enhanced stabilisation of simulant organic nuclear wastes in metakaolin-based geopolymers using graphene oxide","authors":"Sivasubramaniam Seralathan, Xiaobo Niu, Yogarajah Elakneswaran, Chewei Fang","doi":"10.1016/j.clay.2025.107793","DOIUrl":"10.1016/j.clay.2025.107793","url":null,"abstract":"<div><div>Considering the hazardous nature of organic nuclear wastes to both humans and the environment, it is essential to dispose of them in an environmentally friendly manner. This research evaluated the solidification/stabilisation method for effectively disposing of organic nuclear wastes in metakaolin-based geopolymers by simulating highly contaminated organic waste in the laboratory. The oil was pre-emulsified with an alkali activator using graphene oxide (GO) as the emulsion stabiliser to stabilise oil droplets in the geopolymer matrix. Its performance was compared with samples using the cationic surfactant hexadecyltrimethylammonium bromide (CTAB). Experiments evaluated the emulsion stability and solidification of organic waste in the geopolymer composite. The results showed that GO-stabilised emulsions were highly stable, maintaining a constant creaming index due to GO's strong barrier around the oil droplets. Adding GO, CTAB, and oil does not interfere with geopolymerisation. GO reduces the flowability of the fresh paste by 41 % due to its high water demand and increased viscosity. However, it significantly enhances the compressive strength of the geopolymer by 65.5 % after 28 days, acting as a nanofiller that improves the material's load transfer and cohesion. Total organic carbon (TOC) leaching tests show minimal oil leaching, under 0.12 % of total oil content, stabilising within three days, giving high-performance organic waste-solidified samples.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"271 ","pages":"Article 107793"},"PeriodicalIF":5.3,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143682811","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 predictive model for calculating the electrostatic intercalation efficiency of methotrexate-loaded laponite dependent on clay concentration and pH built from binding constants 根据结合常数建立一个预测模型，用于计算粘土浓度和 pH 值对装载甲氨蝶呤的青石的静电插层效率的影响

IF 5.3 2区地球科学

Applied Clay Science Pub Date : 2025-03-15 DOI: 10.1016/j.clay.2025.107781

J.C. Alva-Ensastegui , A. Jiménez-Mondragón , Enrique Morales-Avila , Diana L. Pérez-Velasco , Alexander Pérez de la Luz , M.J. Bernad-Bernad

{"title":"A predictive model for calculating the electrostatic intercalation efficiency of methotrexate-loaded laponite dependent on clay concentration and pH built from binding constants","authors":"J.C. Alva-Ensastegui , A. Jiménez-Mondragón , Enrique Morales-Avila , Diana L. Pérez-Velasco , Alexander Pérez de la Luz , M.J. Bernad-Bernad","doi":"10.1016/j.clay.2025.107781","DOIUrl":"10.1016/j.clay.2025.107781","url":null,"abstract":"<div><div>The chemical species distribution diagram is a two-dimensional model (molar fraction vs pL) that provides information about the fractions of a molecule of interest in its free form, M, or bound to a ligand, L, to form the complex, M-L. The system presented in this research work involves the anticancer drug methotrexate, MTX, and the nanoclay laponite, Lap, represented as M and L respectively. Four systems with pH values: 1.63 ± 0.01, 3.34 ± 0.01, 4.81 ± 0.01, and 7.56 ± 0.01 were used to calculate of the conditional binding constants of the MTX-Lap complexes, in which the different chemical species of MTX predominate. The changes were followed spectrophotometrically and the data obtained were analysed using Stability Quotients from Absorbance Data (SQUAD) to determine these values. The Log β values obtained with SQUAD corresponding to the MTX-Lap complexes were: 4.92 ± 0.01, 4.38 ± 0.02, 3.60 ± 0.06, and 2.516 ± 0.007 corresponding to the pH values mentioned above. Plotting the logarithm of the conditional dissociation constant, Log K, as a function of pH gives a linear behaviour with the equation “Log K = -0.4149*pH + 5.6556” and R<sup>2</sup> of 0.9941. The Log K value of this linear relationship can be substituted by Log β. The Log β (pH dependent) is substituted into the mole fraction equations to obtain models that determine the molar percentages of free MTX and encapsulated MTX that depend only on pLap and pH. The mathematical model proposed in this research work is compared with experimental data to predict the percentage of free MTX as a function of nanoclay concentration and pH, with acceptable results.</div></div>","PeriodicalId":245,"journal":{"name":"Applied Clay Science","volume":"270 ","pages":"Article 107781"},"PeriodicalIF":5.3,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143627998","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