Clays and Clay Minerals最新文献

{"title":"High-temperature-resistant organoclay via quaternary ammonium salt and silane co-modification for oil-based drilling fluids","authors":"Dongyue Zhang, Jianhua Wang, Xiaoxiao Ni, S. He, Jiaqi Zhang","doi":"10.1017/cmn.2025.10009","DOIUrl":"https://doi.org/10.1017/cmn.2025.10009","url":null,"abstract":"Abstract Effective performance of oil-based drilling fluids (OBFs) in demanding high-temperature environments hinges on the stability of their rheological properties. However, conventional organoclays (OCs) utilized to control these properties often exhibit thermal degradation at elevated temperatures, necessitating the development of more robust alternatives. Therefore, the present study aimed to develop a high-temperature-resistant OC to enhance OBF rheological stability. To address the thermal instability issues of conventional quaternary organo-montmorillonites (OMts), which manifest as interlayer structural collapse and particle aggregation, an innovative dual modification strategy was developed through the synergistic combination of quaternary ammonium intercalation and silane grafting. Montmorillonite (Mnt) was modified with dioctadecyl dimethyl ammonium chloride (1821) and stearyl dimethyl benzyl ammonium chloride (1827) at a mass ratio of 2:1 to yield 1821+1827-OMt, which was subsequently further modified with dodecyl trimethoxy silane (DTMS) to form 1821+1827+DTMS-OMt. Comparison of the properties of 1821+1827-OMt and 1821+1827+DTMS-OMt after high temperatures revealed the following. (1) Thermogravimetric (TG) and derivative thermogravimetric (DTG) analysis and gel volume tests demonstrated that the Si–O–Si bonds in 1821+1827+DTMS-OMt were thermally stable up to ~440°C, and the gel volume of the 1821+1827+DTMS-OMt suspension remained stable at 100 mL following high-temperature aging treatments. (2) X-ray diffraction and elemental analysis revealed that 1821+1827+DTMS-OMt exhibited a larger basal spacing and larger nitrogen content compared with ungrafted 1821+1827-OMt. (3) The suspension containing 1821+1827+DTMS-OMt demonstrated enhanced thermal stability at 260°C, evidenced by its narrower rheological parameter ranges of apparent viscosity (6–12 mPa s), plastic viscosity (5–9 mPa s), and yield point (1–3 Pa), compared with those of the suspension containing 1821+1827-OMt. (4) Optical microscopy demonstrated that 1821+1827+DTMS-OMt exhibited greater resistance to agglomeration at high temperatures than 1821+1827-OMt. The high-temperature-resistant OC developed in this study overcomes the thermal instability of traditional OCs, providing a robust approach for enhancing the efficiency and reliability of oil-based drilling fluids in high-temperature drilling applications.","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147906576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Understanding the sepiolite–indigo interaction and its effect on Maya blue pigment by alkali pre-treatment of sepiolite","authors":"Li Li, Guanzheng Zhuang, Yanfu Wei, Mohammad Fahimizadeh, Peng Yuan","doi":"10.1017/cmn.2025.2","DOIUrl":"https://doi.org/10.1017/cmn.2025.2","url":null,"abstract":"Abstract Sepiolite is considered a suitable substrate for Maya blue pigment. However, the interaction between sepiolite and indigo dye has not been fully understood. Previous studies have demonstrated that pre-treatment of sepiolite by heating or acid was useful in identifying the sepiolite–indigo interaction. The purpose of the present study was to prepare a series of hybrid sepiolite–indigo pigments after modifying the sepiolite using various alkali treatments (NaOH), then to evaluate their properties with respect to color, chemical resistance, and photostability. Samples were characterized using reflectance spectroscopy, X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectroscopy, transmission electron microscopy, and N 2 adsorption-desorption. Under alkaline conditions, Si 4+ and Mg 2+ ions in sepiolite partially dissolved, disrupting the coordinated water associated with them. Mg 2+ ions precipitated and blocked the structural channels of the sepiolite. The impact of the alkali treatment on the microporous structure and coordinated water of sepiolite significantly influenced the color properties and stability of the hybrid pigments. Proper alkaline treatment enhanced the greenish hue and chemical stability of the pigment, while severe treatments apparently compromised the structural integrity of the sepiolite, thus diminishing the quality of the hybrid pigment. Results from this study provide new insights into the color-causing and stabilizing mechanisms of sepiolite-based Maya blue pigment and also provide guidance for developing hybrid pigments based on clay minerals and organic dyes.","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147885458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Correlation of serum Adenosine Deaminase levels with microbiological parameters in Pulmonary Tuberculosis.","authors":"Krishna Sarkar, Bineeta Kashyap, Rajat Jhamb, S V Madhu, Rajnish Avasthi, Puneeta Hyanki","doi":"10.1007/s12291-023-01116-5","DOIUrl":"10.1007/s12291-023-01116-5","url":null,"abstract":"<p><p>Accurate diagnosis of pulmonary tuberculosis is largely based on sputum smear microscopy, culture, and GeneXpert MTB/RIF tests; culture being the gold standard. All these diagnostic tests require sputum sample to be positive for <i>Mycobacterium</i> <i>tuberculosis</i>, while many active TB patients often do not present with <i>M. tuberculosis</i> positive sputum. Biochemical markers play an important role in early diagnosis, disease prevention, and drug response in tuberculosis. This study aims to find the association of serum adenosine deaminase (a biomarker) with the various microbiological parameters like sputum smear microscopy, culture and CBNAAT in pulmonary tuberculosis patients. A total of 40 cases were collected from November 2019 to October 2021, and the presumptive cases of pulmonary tuberculosis diagnosed by Ziehl-Neelsen staining for acid fast bacilli and/or CBNAAT were recruited. Serum adenosine deaminase levels were estimated.The following variables were significantly associated (<i>p</i> < 0.05) with serum adenosine deaminase levels: age, sputum smear microscopy findings, time to culture positivity, CBNAAT category and Ct value (Mean).This study does witness few significant correlations between serum adenosine deaminase levels and various microbiological parameters used in diagnosis of TB, which can be further explored and utilised in diagnosis and treatment of pulmonary tuberculosis.</p>","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"42 1","pages":"380-386"},"PeriodicalIF":2.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11239626/pdf/","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88689789","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Adsorption-desorption of lead by polycarboxylate-coated bentonite","authors":"Chuang Yu, Zhi-lei Zeng, Xiaoqing Cai, Zhi-hao Chen, Rao-ping Liao","doi":"10.1017/cmn.2024.2","DOIUrl":"https://doi.org/10.1017/cmn.2024.2","url":null,"abstract":"Abstract To develop more economical and efficient heavy metal adsorbents, natural bentonite was employed as a raw material, and triethoxyvinylsilane served as a grafting agent to achieve the grafting bonding of sodium polyacrylate and bentonite. Structural alterations in the modified bentonite were analyzed through thermogravimetric analysis (TGA), scanning electron microscopy (SEM), and X-ray diffraction (XRD). The adsorption and desorption characteristics of SAPAS-Bentonite and raw bentonite were compared and tested under various conditions, including time, temperature, pH, and lead ion concentration. The adsorption and desorption properties of sodium polyacrylate-grafted bentonite (SAPAS-Bentonite) were compared under various conditions (time, temperature, pH, and lead ion concentration). The results revealed that the modified method successfully achieved nano-scale coating of bentonite particles with sodium polyacrylate, leading to an increase in the maximum adsorption capacity of lead ions by 47.5%, reaching 165.73 mg g. A greater adsorption affinity for lead ions was exhibited by the outer sodium polycarboxylate portion of SAPAS-Bentonite compared with the inner bentonite. The adsorption of internal bentonite was limited by blocking when the adsorption of sodium polyacrylate did not reach the upper limit. The adsorption isotherm shifted from the Langmuir monolayer characteristic of the original bentonite to the S-shaped isotherm, reflecting the sodium polycarboxylate properties of SAPAS-Bentonite. Both bentonites demonstrated strong retention capacity for lead, with SAPAS-Bentonite surpassing raw bentonite in performance. This study provides valuable insights into the potential of SAPAS-Bentonite in the treatment of heavy metal pollution.","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147916622","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of temperature on mineral evolution and adsorption of Eu³⁺ by bentonite in hyperalkaline conditions","authors":"Rao-ping Liao, Yong-Gui Chen, Chuang Yu, Weimin Ye, Dongbei Wu, Cong Liu, Qiong Wang","doi":"10.1017/cmn.2024.23","DOIUrl":"https://doi.org/10.1017/cmn.2024.23","url":null,"abstract":"Abstract Compacted bentonite, used as an engineering barrier for permanent containment of high-level radioactive waste, is susceptible to mineral evolution resulting in compromise of the expected barrier performance due to alkaline–thermal chemical interaction in the near-field. To elucidate the mineral-evolution mechanisms within bentonite and the transformation of the nuclide adsorption properties during that period, experimental evolution of bentonite was conducted in a NaOH solution with a pH of 14 at temperatures ranging from 60 to 120°C. The results showed that temperature significantly affects the stability of minerals in bentonite under alkali conditions. The dissolution rate of fine-grained cristobalite in bentonite exceeds that of smectite, with the phase-transition products of smectite being temperature-dependent. As the temperature rises, smectite experiences a three-stage transformation: initially, at 60°C, the lattice structure thins due to the collapse of the octahedral sheets; at 80°C, the lattice disintegrates and reorganizes into a loose framework akin to albite; and by 100°C, it further reorganizes into a denser framework resembling analcime. The adsorption properties of bentonite exhibit a peak inflection point at 80°C, where the dissolution of the smectite lattice eliminates interlayer pores and exposes numerous polar or negatively charged sites which results in a decrease in specific surface area and an increase in cation exchange capacity and adsorption capacity of Eu 3+ . This research provides insights into the intricate evolution of bentonite minerals and the associated changes in radionuclide adsorption capacity, contributing to a better understanding of the stability of bentonite barriers and the effective long-term containment of nuclear waste.","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"72 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147917264","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Identifying Detrital and Diagenetic Minerals in Paleosols of the Illinois Basin","authors":"","doi":"10.1007/s42860-023-00267-z","DOIUrl":"https://doi.org/10.1007/s42860-023-00267-z","url":null,"abstract":"<h3>Abstract</h3> <p>Phyllosilicates are hypothesized to be primarily of pedogenic origin in shallowly buried paleosols (≤3 km depth), regardless of the age of the paleosol. To test this hypothesis, this work evaluates the possible presence of detrital and diagenetic phyllosilicates in middle and upper Pennsylvanian paleosols, collected from three drill cores along a north–south transect in the Illinois Basin. The abundances of 2<em>M</em>₁ muscovite, quartz, and K-feldspar are greater in a morphologically immature Protosol from the southernmost core; 1<em>M</em>_d illite and interstratified illite-smectite with R1 and R0 stacking orders are more abundant in the more mature Vertisols of the central and northern cores. K-Ar age values of multiple clay-size fractions from each paleosol averaged ~260 Ma in the northern core, 270 Ma in the central core, and 295 Ma in the southern core. While considering the complex tectonic and thermal history of the Illinois Basin, detrital minerals are more abundant in immature paleosols that experienced relatively greater maximum burial depths and thus greater sediment supply whereas illitization in more mature paleosols was probably initiated primarily during protracted burial diagenesis. As the present study found evidence for diagenetic and detrital minerals in clay-size fractions of shallowly buried, deep-time paleosols, caution is advised when using paleosol minerals for ancient climate and environment reconstructions.</p>","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"1 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139066569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization Study of some Bauxite Deposits in Northern Brazil","authors":"Barbara da Rocha Pereira, Morgana Rosset, José Diogo de Oliveria Lima, Keila Palheta Gomes, Denise Crocce Romano Espinosa, Jorge Alberto Soares Tenório","doi":"10.1007/s42860-023-00264-2","DOIUrl":"https://doi.org/10.1007/s42860-023-00264-2","url":null,"abstract":"<p>Alumina is produced from bauxite, which contains a mixture of various oxides, such as aluminum (Al), iron (Fe), silicon (Si), and titanium (Ti). Bauxite can also be considered a source of several other valuable metals, such as scandium (Sc), vanadium (V), and gallium (Ga). The composition and mineralogy of alumina determine their economic value, but their characteristics vary by locality. The physicochemical characteristics of bauxites can also be influenced largely by weathering processes, even within the same locality. For this reason, the present study was undertaken with the objective of comparing the characterization data of three bauxite samples collected, which will be referred to as D, E, and F, from the Cruz Alta do Pará plateau in northern Brazil. The samples were solubilized by multi-acid digestion and fusion with lithium metaborate to quantify their metal compositions by inductively coupled plasma optical emission spectrometry (ICP-OES). The mineralogical characterization was conducted by X-ray diffraction (XRD), and the phase changes of minerals in bauxite were detected by thermogravimetric analysis (TGA/DTG). The total organic carbon (TOC) technique was used to quantify the C in the samples, and the moisture content was also measured. Alumina was 30 wt.% on average for all samples, good for producing high-purity alumina by hydrometallurgical processes. The results, however, showed high (~20 at.%) silica concentrations in two samples and ~3 wt.% Fe in one sample, which can pose a challenge in the Bayer process. The X-ray diffraction (XRD) analysis showed that gibbsite (Gbs), kaolinite (Kln), anatase (Ant), and hematite (Hem) were the major mineral phases in these samples. The study showed that the samples from the same mine vary in their metal content, especially with regard to Si, and they, thus, need to be processed selectively to maximize their economic value.</p>","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"6 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139054384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Super-efficient Reduction of 4-nitrophenol Using Raw Pelagic Clays as Catalysts","authors":"Peiping Zhang, Tongtong Liu, Xue Sun, Qing Liang, Wei Zhang, Weikun Ning, Wenqing Li, Xuefa Shi, Shiding Miao","doi":"10.1007/s42860-023-00266-0","DOIUrl":"https://doi.org/10.1007/s42860-023-00266-0","url":null,"abstract":"<p>Natural clays are often employed as substrates for heterogeneous catalysts. However, the direct use of raw clays as catalysts has received less research attention. The objective of the present study was to help fill this gap by investigating catalytic properties of raw pelagic clays (PC) collected from the Indian Ocean. The raw PC were discovered to be efficient catalysts in the reduction of 4-nitrophenol (4-NP) in the presence of NaBH₄. The effects of parameters including pH values, dosages of PC, and initial concentration of 4-NP and NaBH₄ on the conversion or degradation rate of 4-NP have been investigated. The 4-NP was observed to be completely degraded within 480 s under conditions of 0.10 mM 4-NP, 25.0 mM NaBH₄, and 0.20 g/L PC at an initial pH value of 7.0. The apparent rate constant was evaluated to be 27.53 × 10^–3 s^–1. Unlike previous pseudo-first order kinetics experiments, the induction period and degradation stages were observed to occur simultaneously during the PC catalysis. The S-shaped kinetics for 4-NP conversion was found to be perfectly matched by Fermi's function, and the enzyme-like catalysis by PC was appointed to describe the kinetics. Species of Fe(III), Mn(IV), and Mn(III) in PC were found to be essential, and were partly reduced to Fe(0) and Mn(II) by NaBH₄ in our reaction, contributing to rapid conversion of 4-NP to 4-aminophenol (4-AP). The raw PC was converted to magnetic PC (m-PC) particles, which made PC particles separate easily for cycling use. This discovery would also have applications in continuous flow-fluid catalysis.</p>","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"13 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139054385","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental Peloid Formulation Using a Portuguese Bentonite and Different Mineral-Medicinal Waters Suitable for Therapeutic and Well-being Purposes","authors":"Carla Marina Bastos, Fernando Rocha","doi":"10.1007/s42860-023-00260-6","DOIUrl":"https://doi.org/10.1007/s42860-023-00260-6","url":null,"abstract":"","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"64 11","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138950576","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A New Preparation Method for cis-1,4-polyisoprene/Na-montmorillonite Latex Composites by in situ Solution Emulsification","authors":"Liyun Guo, Haichang Zhang, Jing Hua, Danfeng Liu","doi":"10.1007/s42860-023-00265-1","DOIUrl":"https://doi.org/10.1007/s42860-023-00265-1","url":null,"abstract":"","PeriodicalId":10320,"journal":{"name":"Clays and Clay Minerals","volume":"68 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2023-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139006592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}