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Journal articles on the topic 'Palygorskite'

Author: Grafiati
Published: 4 June 2021
Last updated: 26 July 2025

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1

Neaman, A., and A. Singer. "Kinetics of palygorskite hydrolysis in dilute salt solutions." Clay Minerals 35, no. 2 (2000): 433–41. http://dx.doi.org/10.1180/000985500546783.

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AbstractFive palygorskite samples with different chemical compositions and specific surface areas (SSA) were used for this study. Batch experiments in dilute salt solutions under neutral conditions were conducted to study the kinetics of clay hydrolysis. The rates of release of Mg and Si differ significantly among the palygorskite samples. It was found that differences in release rate of Mg among the palygorskite samples are due to differences in both surface area and chemical composition. The rate of release of Mg was greater in palygorskites with high SSA and high Mg and Fe contents than tha
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2

del Buey, Pablo, María Esther Sanz-Montero, Juan Pablo Rodríguez-Aranda, Mónica Sánchez-Román, and Fernando Nieto. "The Miocene Source-to-Sink Evolution of Fibrous Clay Minerals in Hyperalkaline Playa-Lakes, Duero Basin (Central Spain)." Minerals 15, no. 1 (2025): 50. https://doi.org/10.3390/min15010050.

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Palygorskite is assumed to be the predominant clay mineral in playa-lakes, where it may be detrital or authigenic in origin. Discriminating between detrital and authigenic clays is crucial to elucidate paleoenvironmental conditions in lacustrine deposits. This study provides insight into the sedimentary evolution of clay minerals from source, lacustrine Miocene marlstones and mudstones, to sink, represented by three recent hyperalkaline playa-lakes in Central Spain. XRD, TEM, and AEM analyses show concomitant detrital and authigenic palygorskites in the three playa-lakes. The inherited palygor
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3

Antosik, Adrian Krzysztof, Edyta Kucharska, and Karolina Mozelewska. "Study of Applying Naturally Occurring Mineral Materials for Silicone Pressure-Sensitive Adhesives." Materials 16, no. 5 (2023): 2092. http://dx.doi.org/10.3390/ma16052092.

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Silicones are commonly used as adhesives when high-quality materials are required due to harsh environmental conditions such as high temperature, humidity, etc. To ensure high resistance to environmental conditions, including high temperatures, modifications of silicone adhesives are made using fillers. The characteristics of a modified silicone-based pressure-sensitive adhesive with filler are the focus of this work. Functionalized palygorskite was prepared in this investigation by grafting 3-mercaptopropyltrimethoxysilane (MPTMS) onto palygorskite (palygorskite-MPTMS). The palygorskite was f
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4

Wu, Xue Ping, Cun Liu, Liang Zhang, Xian Long Zhang, and Li Ping Cheng. "Effect of Hydrothermal Treatment on Structural Character of Palygorskite and Adsorption Efficiency for Methylene Blue." Advanced Materials Research 726-731 (August 2013): 560–64. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.560.

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Palygorskite is widely used as an adsorbent for all kinds of pollutants in wastewater. The effect of hydrothermal treatment parameters including temperature and time on palygorskite's structural character and its adsorption of methylene blue were studied. The structures of the prepared palygorskite adsorbent were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectrometry (IR), and Brunauer-Emmett-Teller (BET) analysis. The results illustrate that the palygorskite fibers become shorter evidenced by TEM analysis, but there is no obvi
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5

Zhang, Xian Long, Wei Ping Jiang, Xue Ping Wu, et al. "The Effect of Thermal Treatment on the Structure of Palygorskite Used for Flue Gas SO2 Removal." Advanced Materials Research 356-360 (October 2011): 698–703. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.698.

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Palygorskite is widely used as industrial adsorbent and also potential for flue gas desulfurization by adsorption of SO2. The effect of thermal treatment on Palygorskite’s structural properties and its performance in SO2adsorption were investigated. The textural and structural properties of the prepared palygorskite adsorbent were characterized by X-ray diffraction, transmission electron microscopy and temperature programmed desorption. The result showed the channel of Palygorskite is partial collapsed and the structure is not changed ultimately when thermally treated below 300 °C. The structu
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6

Cai, Y. F., and J. Y. Xue. "A study of adsorption and absorption mechanisms of copper in palygorskite." Clay Minerals 43, no. 2 (2008): 195–203. http://dx.doi.org/10.1180/claymin.2008.043.2.04.

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AbstractDesorption experiments performed on four Cu-adsorbed palygorskites suggest that the leached Cu2+ ion originates at the surface and/or net-like interstice of the palygorskite fibres. The leached fraction, calculated from the quantities of adsorbed Cu2+ before and after desorption, is <1%. This may indicate that the majority of Cu is in inaccessible structural sites. X-ray diffraction, X-ray photoelectron spectroscopy, Fourier transform infrared (FTIR) spectroscopy and electron spin resonance (ESR) were used to determine the mineralogical character of the Cu-adsorbed palygorskite. Two
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7

Feng, Liang Dong, Bo Qing Chen, Ying Ying Shi, et al. "Adsorption Characters of Mn2+ onto Palygorskites Modified by 1, 10-Phenanthroline and Triethylamine." Advanced Materials Research 178 (December 2010): 8–16. http://dx.doi.org/10.4028/www.scientific.net/amr.178.8.

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1, 10-phenanthroline and triethylamine modified palygorskites were prepared by microwave irradiation, and characterized with FT-IR technique. The effects of contact time, adsorbent dosage, and pH value of the initial solution on the adsorption characters of Mn2+ were investigated. The adsorption of Mn2+ from aqueous solutions using 1, 10-phenanthroline or triethylamine modified palygorskites were investigated. Experiment results indicated that 1,10-phenanthroline and triethylamine molecules have been successfully grafted to palygorskite. The adsorption was rapid during the first 5 minuts and eq
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8

Colson, J., I. Cojan, and M. Thiry. "A hydrogeological model for palygorskite formation in the Danian continental facies of the Provence Basin (France)." Clay Minerals 33, no. 2 (1998): 333–47. http://dx.doi.org/10.1180/000985598545516.

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AbstractThe Danian of the Provence basin (SE France) is characterized by a strong subatmospheric alteration processes throughout the basin. A wide range of facies, depositional and weathering, were recognized in an interval of 5 Myr and include floodplain fine-grained alluvium, palustrine limestones, playa dolostones, mottled palaeosols, vadose and phreatic calcretes, and phreatic dolocretes. Palygorskite was invariably found in laminar, massive and honeycomb vadose calcretes and phreatic dolocretes, as well as in playa dolostones, and only exceptionally in floodplain siltstones, nodular calcr
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9

Lobato-Aguilar, Héctor A., Gabriel Lizama-Uc, Jorge A. Uribe-Calderon, Juan Cauich-Rodriguez, Nayeli Rodriguez-Fuentes, and J. Manuel Cervantes-Uc. "Antibacterial properties and release kinetics of chlorhexidine diacetate from montmorillonite and palygorskite clays." Journal of Biomaterials Applications 34, no. 8 (2019): 1052–58. http://dx.doi.org/10.1177/0885328219891710.

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Organoclays were prepared by means of cation-exchange reactions using different concentrations of chlorhexidine diacetate and two different types of clays: montmorillonite and palygorskite. The antibacterial activity against Escherichia coli was evaluated by means of disk diffusion tests as well as through bacterial growth inhibition (monitored by optical density measurements) in Luria broth media. Results indicate that modified palygorskites showed a greater antibacterial activity than those exhibited by modified montmorillonite, as latter only displayed antibacterial properties at the highes
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10

Yeniyol, M. "Geology and mineralogy of a sepiolite-palygorskite occurrence from SW Eskişehir (Turkey)." Clay Minerals 47, no. 1 (2012): 93–104. http://dx.doi.org/10.1180/claymin.2012.047.1.93.

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AbstractThe present occurrence is the only deposit among those found in Eskişehir province containing both sepiolite and palygorskite in economic amounts. To describe the geology, mineralogy and genetic relationships, two representative measured sections were examined by field work and XRD, XRF and SEM analyses. Sepiolite and palygorskite occur in a ∼40 m thick part of Pliocene sequence where saponite is also found. These minerals appear in ascending order as: palygorskite, saponite, saponite + palygorskite, sepiolite and sepiolite + palygorskite, frequently in association with dolomite. Chemi
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11

Wang, Fei, Qing Guo Tang, and Jin Sheng Liang. "Preparation and Properties of Nanocomposites Containing Polypropylene and Palygorskite." Advanced Materials Research 58 (October 2008): 97–102. http://dx.doi.org/10.4028/www.scientific.net/amr.58.97.

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Polypropylene-palygorskite composites were prepared by melt mixing, using polypropylene as polymer matrix and palygorskite as inorganic components. The couple-agent modification of palygorskite was introduced in detail and the relation between structure and properties of polypropylene composites was mainly studied. The characterization on structure of polypropylene composites indicated that after modified by couple-agent，the dispersity of palygorskite in the polymer matrix was improved. The results showed that mechanical properties of composites were improved generally due to the addition of m
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12

Zhou, Feng-shan, Tian-qi Li, Yun-hua Yan, Can Cao, Lin Zhou, and Yang Liu. "Enhanced Viscosity of Aqueous Palygorskite Suspensions through Physical and Chemical Processing." Advances in Materials Science and Engineering 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/941580.

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Palygorskite has remarkable rheological properties and was used to increase the stability and viscosity of aqueous suspensions. The effects of different physical and chemical processing methods on the apparent viscosity and plastic viscosity of the palygorskite suspensions such as pressing, ultrasound scattering, acidification, and chemical additives have been released. The pressing and ultrasound scattering indicated that the dispersed state of palygorskite could be increased effectively after treatment, and the apparent viscosity of treated-palygorskite samples increased almost 2-3 times com
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13

Hong, H. L., N. Yu, P. Xiao, Y. H. Zhu, K. X. Zhang, and S. Y. Xiang. "Authigenic palygorskite in Miocene sediments in Linxia basin, Gansu, northwestern China." Clay Minerals 42, no. 1 (2007): 45–58. http://dx.doi.org/10.1180/claymin.2007.042.1.04.

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AbstractThe mineralogical characteristics of authigenic palygorskite occurring with chlorite and illite in Miocene sediments in Linxia basin were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and high-resolution transmission electron microscopy (HRTEM). The XRD results suggest that the mineral composition of the sediments includes mainly quartz, chlorite, illite, calcite, plagioclase, orthoclase, minor palygorskite and small amounts of gypsum and ankerite. Two kinds of palygorskite were observed in the sediments, relatively straight fibrous particles found in
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14

Ma, Jiang Quan, Qing Ling Lu, Jun Hao Xia, Xiao Bin Gan, and Chao Yao. "Study on the Drying Mechanism and Dynamics of Palygorskite." Advanced Materials Research 422 (December 2011): 501–4. http://dx.doi.org/10.4028/www.scientific.net/amr.422.501.

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Palygorskite had large applications in chemical, environmental protection, medicine processes and so on. However, since the mineral limitations of natural palygorskite, both improving its quality and meeting the need of industry, palygorskite usually needs to be activated before using it. The influences of activation during the drying process were studied, as well as the drying kinetics of the non-activated of palygorskite. The results showed that the drying rate of palygorskite increased at first, and then came to a constant value, and kept that value for some time. After that, drying rate de
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15

Wang, Shi Long, and Li Na Wang. "Study on the Drying Mechanism and Dynamics of Palygorskite." Advanced Materials Research 706-708 (June 2013): 456–59. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.456.

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Palygorskite had large applications in chemical, environmental protection, medicine processes and so on. However, since the mineral limitations of natural palygorskite, both improving its quality and meeting the need of industry, palygorskite usually needs to be activated before using it. The influences of activation during the drying process were studied, as well as the drying kinetics of the non-activated of palygorskite. The results showed that the drying rate of palygorskite increased at first，and then came to a constant value, and kept that value for some time. After that, drying rate dec
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16

Knidiri, A., L. Daoudi, M. El Ouahabi, B. Rhouta, F. Rocha, and N. Fagel. "Palaeogeographic controls on palygorskite occurrence in Maastrichtian-Palaeogene sediments of the Western High Atlas and Meseta Basins (Morocco)." Clay Minerals 49, no. 4 (2014): 595–608. http://dx.doi.org/10.1180/claymin.2014.049.4.08.

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AbstractThe Maastrichtian-Palaeogene series of the Western High Atlas and Meseta Basins in Morocco are particularly rich in palygorskite. The present work is aimed at clarifying the genesis of palygorskite from the interbedded facies and gaining an understanding of their relationships with the depositional environment. The mineralogical characteristics of palygorskite from these series were studied by X-ray diffraction (XRD) and electron microscopy (SEM/TEM). The palygorskite content and microstructure show large geographical and stratigraphical variations in the deposits studied. The palygors
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17

Lian, Jintao, Yunqiang Yi, Nuanqin Zhang, and Zhanqiang Fang. "Effective degradation of tetracycline by magnetic palygorskite synthesized with different dosages of NaOH." Water Science and Technology 81, no. 7 (2020): 1452–60. http://dx.doi.org/10.2166/wst.2020.194.

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Abstract In the process of preparing magnetic palygorskite from waste pickling liquor of the steel industry, the dosage of NaOH will affect the properties of the magnetic palygorskite. The experimental results showed that magnetic palygorskite can be effectively prepared when NaOH dosage is between 255 and 330 g/L. Vibration sample magnetometry proved that different NaOH dosages can affect the saturation magnetization of magnetic palygorskite. The catalytic performance of five catalysts synthesized with different NaOH dosages hardly changed after five cycles of Fenton-like catalytic degradatio
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18

Liu, Lihui, Shuai Zhang, Qinfu Liu, Linsong Liu, and Youjun Deng. "Palaeoclimate, palaeosalinity and redox conditions control palygorskite claystone formation: an example from the Yangtaiwatan Basin, northwest China." Clay Minerals 56, no. 3 (2021): 210–21. http://dx.doi.org/10.1180/clm.2022.1.

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AbstractPalygorskite-bearing claystones and mudstones were deposited in a salt lake in the middle and lower parts of the Neogene Baiyanghe Formation in the Yangtaiwatan Basin, China. The petrological, mineralogical and geochemical characteristics of the sediments were investigated to determine the factors controlling palygorskite formation. The palygorskite claystones and mudstones have distinctly varying mineral compositions. The claystones are composed of detrital minerals, palygorskite and illite, whereas the mudstones consist mainly of mixed-layer illite/smectite and illite. The palygorski
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19

Pletsch, T., L. Daoudi, H. Chamley, J. F. Deconinck, and M. Charroud. "Palaeogeographic controls on palygorskite occurrence in mid-Cretaceous sediments of Morocco and adjacent basins." Clay Minerals 31, no. 3 (1996): 403–16. http://dx.doi.org/10.1180/claymin.1996.031.3.10.

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AbstractPalygorskite has been identified as a major constituent of the clay fraction in mid-Cretaceous deposits of the Meseta, the Middle Atlas, and the Rif in central and northern Morocco. Two types of palygorskite are differentiated, based on the morphology of crystallites, bio- and lithofacies associations of the containing sediments. Type 1 occurs in sections of the Meseta and the Middle Atlas, where the mineral displays bundles of long fibres under the electron microscope and is associated with shallow marine carbonate and evaporite facies. Type 2 was found in the Rif, where palygorskite
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20

Sun, Xiangyun, Yuting Chen, Long Liang, Guangyuan Xie, and Yaoli Peng. "Research on Hydrocyclone Separation of Palygorskite Clay." Minerals 13, no. 10 (2023): 1264. http://dx.doi.org/10.3390/min13101264.

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The separation methods of palygorskite can be divided into dry separation and wet separation. For wet separation, which is more efficient, the centrifuge is the commonly used method but is characterized as having a high cost. It remains a challenge to separate ultra-fine palygorskite with an economical method. This work tried to separate palygorskite using a hydrocyclone with two separation stages. Orthogonal experiments are designed to investigate the influence of feed concentration, feeding pressure, and underflow port diameter on separation performance. The element content, mineral composit
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21

Neaman, Alexander, and Arieh Singer. "FLOCCULATION OF HOMOIONIC SODIUM PALYGORSKITE, PALYGORSKITE-MONTMORILLONITE MIXTURES AND PALYGORSKITE CONTAINING SOIL CLAYS." Soil Science 164, no. 12 (1999): 914–21. http://dx.doi.org/10.1097/00010694-199912000-00004.

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22

Wang, Fei, Lei Feng, Qingguo Tang, Haifeng Liu, and Huimin Liu. "Preparation and Performance ofcis-Polybutadiene Rubber Composite Materials Reinforced by Organic Modified Palygorskite Nanomaterials." Journal of Nanomaterials 2013 (2013): 1–5. http://dx.doi.org/10.1155/2013/936838.

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The hydrophilic character of palygorskite has been modified by grafting organic group and controlling surface energy for improving compatibility of palygorskite in rubber matrix using palygorskite ascis-polybutadiene rubber fillers. The effects of coupling modification on the performance ofcis-polybutadiene rubber materials filled with palygorskite were investigated, and the influence of coupling agent dosage on their mechanical properties was also studied. The results indicated that the mechanical performance ofcis-polybutadiene rubber materials reinforced by modified palygorskite could be im
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23

Stathopoulou, Elizabeth T., Mercedes Suárez, Emilia García-Romero, et al. "Trioctahedral entities in palygorskite: Near-infrared evidence for sepiolite-palygorskite polysomatism." European Journal of Mineralogy 23, no. 4 (2011): 567–76. http://dx.doi.org/10.1127/0935-1221/2011/0023-2112.

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24

Wang, Jian Rong, Ya Li Liu, Bin Liu, and Yan Ping Wu. "Preparation and Antibacterial Effect of Nanopalygorskite Supported Nano-Silver Powder." Advanced Materials Research 1052 (October 2014): 327–31. http://dx.doi.org/10.4028/www.scientific.net/amr.1052.327.

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A novel method was used to make palygorskite supported nano-silver powder at room temperature. XRD result showed the presence of silver in the final product. TEM investigation revealed that nano-sliver particles of 6-10 nm in diameter were successfully attached on surface of palygorskite fiber. FTIR was also used to clarify the formation mechanism of our method. The antibacterial effect of palygorskite supported nano-silver powder was investigated. Palygorskite supported nano-silver powder had good antibacterial activity on standard Escherichia coli and Staphylococcus aureus.
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25

Toshev, Sherzod, and Hamid Obidov. "Features of the chemical composition and colloidal-chemical properties of local clays of Uzbekistan and their comparison with other clays." IOP Conference Series: Earth and Environmental Science 839, no. 4 (2021): 042076. http://dx.doi.org/10.1088/1755-1315/839/4/042076.

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Abstract This article examines the study of the chemical composition and colloidal-chemical properties of local clays of Uzbekistan and their comparison with other clays. As well as the features of the chemical composition and colloidal - chemical properties of local palygorskite clays. The distinctive features of the chemical composition and properties of local palygorskite clays of the Navai deposit (Uzbekistan) in comparison with the Cherkassky palygorskite (Ukraine) have been studied. Palygorskite clays are considered a valuable raw material for the production of special types of drilling
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26

Kuang, Wenxing, and Christian Detellier. "Insertion of acetone molecules in the nanostructured tunnels of palygorskite." Canadian Journal of Chemistry 82, no. 10 (2004): 1527–35. http://dx.doi.org/10.1139/v04-130.

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The insertion of acetone molecules in the nanostructured tunnels of palygorskite (PFl-1) was studied by thermal gravimetric analysis connected with mass spectrometry and 29Si and 13C solid-state NMR techniques. In comparison with palygorskite, new weight losses appear at 130 and 340 °C for palygorskite previously heated at 150 °C for 20 h then exposed to acetone for a week. Two types of water molecules occupy the palygorskite tunnels: weakly bound zeolitic water and structural water molecules coordinated to Mg(II) cations at the edge of the octahedral sheets. Acetone molecules that intercalate
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27

Christidis, G. E., P. Katsiki, A. Pratikakis, and G. Kacandes. "RHEOLOGICAL PROPERTIES OF PALYGORSKITE-SMECTITE SUSPENSIONS FROM THE VENTZIA BASIN, W. MACEDONIA, GREECE." Bulletin of the Geological Society of Greece 43, no. 5 (2017): 2562. http://dx.doi.org/10.12681/bgsg.11663.

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In this contribution we examine the rheological properties of palygorskite rich clays from the Ventzia Basin, W. Macedonia, Greece. The clays consist of palygorskite and/or dioctahedral Fe-rich smectite (nontronite) and quartz as main components, and serpentine, amphibole and sepiolite as minor constituents. The apparent and plastic viscosity and yield point increase with increasing concentration of clay in the suspension. Flow is Newtonian for 1% suspensions, becoming gradually Bingham plastic (3% clay suspensions) and then pseudoplastic with yield point described by the Herschel Bulckley flo
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BLOOM, RAANAN A. "Palygorskite-Sepiolite." Soil Science 143, no. 4 (1987): 306. http://dx.doi.org/10.1097/00010694-198704000-00009.

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29

Mees, F., R. Adriaens, A. Delgado-Huertas, et al. "Palygorskite-bearing fracture fills in the Kinshasa area, DR Congo – an exceptional mode of palygorskite vein development." South African Journal of Geology 122, no. 2 (2019): 173–86. http://dx.doi.org/10.25131/sajg.122.0013.

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Abstract Tectonic fractures in Palaeozoic strata of the Kinshasa area, DR Congo, locally host palygorskite-bearing veins and associated calcite occurrences. The palygorskite deposits are typically massive, with a varying degree of alignment of clay particles, a higher quartz content than the arkose substrate, and a variable amount of smectite (montmorillonite). The associated calcite occurrences are macrocrystalline coatings and infillings, and more fine-grained calcite veins with cataclastic texture. The calcite coatings and infillings formed from solution in earth surface conditions, as reco
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Zhao, Di Fang, Hong Dian Lu, and Chan Gan Tian. "Zn-Doped Palygorskite Loaded TiO2 for Visible-Light Active Catalysts." Advanced Materials Research 239-242 (May 2011): 3090–95. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.3090.

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Zn-doped palygorskite loaded TiO2for visible-light active catalysts were prepared by the method of liquid ion exchange and precipitation. XRD and SEM measurments show that the titanium dioxide was loaded on the palygorskite and that composite is mainly composed of two phase,that is, the palygorskite and the nano crystalline titanium dioxide. The results show that the composite catalysts showed excellent photocatalytic ability and quantum efficient.
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31

Lin, Shao Hua, Jie Rui Li, Zheng Wang, and Zhao Qian Jing. "Study on Adsorption Characteristics of Ni (II) by Palygorskite." Advanced Materials Research 136 (October 2010): 289–92. http://dx.doi.org/10.4028/www.scientific.net/amr.136.289.

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Adsorption characteristics of Ni (II) by Palygorskite were investigated using a batch adsorption, and the effects of various experimental parameters were discussed. Results showed that the adsorption capacity of palygorskite for Ni (II) increased with increasing contact time and amount of adsorbent. Ni (II) adsorption onto palygorskite was well fitted by the pseudo-first-order kinetic model. Adsorption capacity increased to a maximum as the treating temperature increased to 673K. Heat-activation at 773K resulted in degradation of channel structure and adsorption capacity loss of palygorskite.
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de Souza, Cristiane Gimenes, Tammy Caroline Lima de Jesus, Rafael Cavalcante dos Santos, et al. "Characterization of Brazilian palygorskite (Guadalupe region) and adsorptive behaviour for solvatochromic dyes." Clay Minerals 56, no. 1 (2021): 55–64. http://dx.doi.org/10.1180/clm.2021.16.

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AbstractThis work presents the results of the physical characterization of palygorskite and its adsorptive behaviour for three solvatochromic dyes (Nile blue chloride (NBC), methylene blue (MTB) and dithizone (DTZ)). Adsorption isotherms were used to determine the maximum adsorption of the solvatochromic dyes on the palygorskite. The characterization of palygorskite was carried out via mineralogical and chemical analysis with X-ray diffraction, X-ray fluorescence, scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy, surface-charge
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33

Zhang, Junping, Qin Wang, Hao Chen, and Aiqin Wang. "XRF and nitrogen adsorption studies of acid-activated palygorskite." Clay Minerals 45, no. 2 (2010): 145–56. http://dx.doi.org/10.1180/claymin.2010.045.2.145.

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AbstractThe effects of acid activation on the chemical composition, surface area and pore structure of palygorskite from Xuyi (Jiangsu, P.R. China) were investigated systematically using X-ray fluorescence (XRF) and BET techniques. The palygorskite samples were activated with HCl, H2SO4 and H3PO4 of various concentrations at 80ºC for 4 h. The influences of acid concentration and acid type on the chemical composition, adsorption-desorption isotherms at 77 K, pore-size distribution, surface area and pore volume were studied in detail. The contents of most components of palygorskite decrease with
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34

Hojati, S., H. Khademi, J. M. Arocena, A. Faz Cano, and S. Ayoubi. "Chronostratigraphic distribution and genesis of palygorskite in Tertiary sediments of the Isfahan region, central Iran." Clay Minerals 47, no. 1 (2012): 11–29. http://dx.doi.org/10.1180/claymin.2012.047.1.11.

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AbstractNo comprehensive study has yet been conducted to determine the chronostratigraphic distribution of palygorskite in the Tertiary sediments of Iran. Thirty sediment samples of different Tertiary epochs were taken, based on the field observations and geological maps. The clay fraction of samples was then investigated by X-ray diffraction (XRD), transmission and scanning electron microscopy (TEM and SEM), and inductively coupled plasma mass spectrometry (ICP-MS). Results showed that sediments of the Miocene and Pliocene had large amounts of palygorskite whereas no trace of this mineral was
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35

Gonçalves, Ruth Luna do Nascimento, Anna Carolina Amorim Costa, Mário César de Siqueira Lima, et al. "A New Application for Salted Water-Based Fluids with Palygorskite: Formulation Designing for Temporary Plug and Abandonment Operations of Petroleum Wells." Applied Sciences 15, no. 6 (2025): 2980. https://doi.org/10.3390/app15062980.

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Palygorskite has shown satisfactory performance in salted water-based fluids, especially as a rheological agent. However, this type of formulation has been used in the petroleum industry only in well drilling operations. This study proposes the development of a salted water-based fluid with palygorskite, which presents an adequate performance as a liquid barrier element in temporary abandonment operations of wells. Based on a factorial design, seven fluid formulations were prepared with varying concentrations of palygorskite and PAC LV and were tested by measuring the HPHT filtrate volume, rhe
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36

Stahr, K., J. Kühn, J. Trommler, K.-H. Papenfuß, M. Zarei, and A. Singer. "Palygorskite-cemented crusts (palycretes) in Southern Portugal." Soil Research 38, no. 1 (2000): 169. http://dx.doi.org/10.1071/sr99002.

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In the Oriola depression of Southern Portugal near the town of Evora, field examinations revealed the presence of Tertiary sedimentary deposits that had the consistency of duricrusts. These duricrusts, occurring close to the land surface, were examined in the field as well as in the laboratory, with the objective of establishing their composition and formation. Micromorphological examinations showed that the duricrusts were composed of clasts of fine sand to fine gravel sizes cemented together by a matrix dominated by either palygorskite or carbonate. The matrix : clasts ratio varied from abou
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37

Li, Z., K. He, L. Yin, F. Xiong, and Y. C. Zheng. "Crystallochemistry of Fe-rich palygorskite from eastern China." Clay Minerals 42, no. 4 (2007): 453–61. http://dx.doi.org/10.1180/claymin.2007.042.4.03.

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AbstractIron cations in the octahedral sheet are a disadvantage to the industrial application of palygorskite clays. In this study, a palygorskite sample from eastern China (Mayaoshan deposit, Jiangsu Province) is shown to have an Fe content that is much greater than usual. The structural formula of the Fe-rich palygorskite sample was established as (Si7.48Al0.52) (Al1.24Fe0.94Mg1.77Ti0.03⁏1.02)O20(OH)2(OH2)4. The palygorskite is seen to be dioctahedral according to the structural formula, consistent with Fourier transform infrared data. Occurrences of AlFe3+ɏOH and Fe3+Fe3+ɏOH vibrations in t
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38

Sánchez, C., and E. Galán. "An approach to the genesis of palygorskite in a Neogene-Quaternary continental basin using principal factor analysis." Clay Minerals 30, no. 3 (1995): 225–38. http://dx.doi.org/10.1180/claymin.1995.030.3.06.

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AbstractThe Carrión lacustrine basin (≈10 km2), central Spain, is filled with Neogene-Quaternary sediments (20–25 m thick) rich in palygorskite. Two clay units of ∼15 m thick are of particular interest in the basin. The lower one contains over 75% phyllosilicates (palygorskite up to 90%, smectites and illite) in marginal areas (facies A), and it is laterally bound by a distal facies (B) also rich in clay minerals (smectites and illite, and some palygorskite) and gypsum, and includes dolomitic marl intercalations. The composition at the top is primarily marly, with some gypsum (C). The upper cl
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39

Zhang, Yimin, Yan Wang, Ligang Zheng, Tao Yang, Jianliang Gao, and Zhenhua Li. "Effect of Pristine Palygorskite Powders on Explosion Characteristics of Methane-Air Premixed Gas." Energies 11, no. 10 (2018): 2496. http://dx.doi.org/10.3390/en11102496.

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In this study, pristine palygorskite powders were used as the inhibition materials to suppress the explosion of methane-air premixed gas for the first time. The composition, porosity and pyrolysis characteristics of the powders were tested by X-ray diffraction (XRD), energy dispersive spectrometry (EDS), N2 adsorption-desorption and Thermogravimetry-differential scanning calorimetry (TG-DSC) techniques. The effects of pristine palygorskite powders concentration on the explosion pressure and the average velocity of flame propagation of the 9.5% methane-air premixed gas were tested by a 20 L sph
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40

Liu, Chuan-Wen, Min-Hsien Liu, To-Mai Wang, and Cheng-Lung Chen. "Study of the metal ion adsorption capacity of palygorskite by computer simulation." Journal of the Serbian Chemical Society, no. 00 (2023): 82. http://dx.doi.org/10.2298/jsc230708082l.

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Palygorskite is a magnesium-rich aluminosilicate clay mineral with a unique chain-layered structure. This structure gives palygorskite a large specific surface area and interesting physical properties. Many researchers have investigated the applications of palygorskite in various fields, including heavy metal adsorption, petroleum and chemical industries, building materials, medicine, and agriculture. In this study, molecular dynamics simulations were used to explore the heavy metal adsorption ability of palygorskite. The results showed that polyacrylic acid (PAA) had a heavy metal adsorption
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41

Corma, A., A. Mifsud, and E. Sanz. "Kinetics of the acid leaching of palygorskite: Influence of the octahedral sheet composition." Clay Minerals 25, no. 2 (1990): 197–205. http://dx.doi.org/10.1180/claymin.1990.025.2.05.

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AbstractA study has been carried out on the influence of acid concentration, time and temperature of reaction, liquid to solid ratio and chemical composition of the mineral on the extension and selectivity of the octahedral cations extracted during acid leaching of palygorskite. The mechanism of the extraction of Mg2+, Al3+, and Fe3+ is discussed on the basis of kinetic models fitted for a reacting-shell model, taking into account particle shape and the rate controlling step. A model is given from which kinetics parameters and the activation energy of the process are calculated. The different
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42

Ferraz, Eduardo, Luís Alves, Pedro Sanguino, Julio Santarén, Maria G. Rasteiro, and José A. F. Gamelas. "Stabilization of Palygorskite Aqueous Suspensions Using Bio-Based and Synthetic Polyelectrolytes." Polymers 13, no. 1 (2020): 129. http://dx.doi.org/10.3390/polym13010129.

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Palygorskite is a natural fibrous clay mineral that can be used in several applications, for which colloidal stability in aqueous suspensions is a key point to improve its performance. In this study, methods of magnetic stirring, high-speed shearing, and ultrasonication, as well as different chemical dispersants, combined with these methods, namely carboxymethylcellulose, alginate, polyphosphate, and polyacrylate, were used to improve the dispersibility and the formation of stable suspensions of palygorskite in different conditions of pH. The stability and particle size of suspensions with a l
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43

Kirkman, J. H., and R. C. Wallace. "Palygorskite in the Regolith from the Mokau District, North Island, New Zealand." Clay Minerals 29, no. 2 (1994): 265–72. http://dx.doi.org/10.1180/claymin.1994.029.2.12.

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AbstractCorrugated mats of palygorskite occurring in regolith overlying a fissured limestone were examined by X-ray diffraction, infrared spectroscopy, and electron optical techniques after heating at 50°C intervals to 700°C. Palygorskite ‘anhydride’ formed at 400°C and sillimanite formed at 500°C. The palygorskite is believed to have formed in joints in limestone of Upper Oligocene age (Duntroonian) prior to uplift and subsequent weathering. It is highly crystalline, and appears not to have altered or weathered since precipitation.
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44

Li, Shue, Bin Mu, Xiaowen Wang, Yuru Kang, and Aiqin Wang. "Fabrication of Eco-Friendly Betanin Hybrid Materials Based on Palygorskite and Halloysite." Materials 13, no. 20 (2020): 4649. http://dx.doi.org/10.3390/ma13204649.

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Eco-friendly betanin/clay minerals hybrid materials with good stability were synthesized by combining with adsorption, grinding, and heating treatment using natural betanin extracted from beetroot and natural 2:1 type palygorskite or 1:1 type halloysite. After incorporation of clay minerals, the thermal stability and solvent resistance of natural betanin were obviously enhanced. Due to the difference in the structure of palygorskite and halloysite, betanin was mainly adsorbed on the outer surface of palygorskite or halloysite through hydrogen-bond interaction, but also part of them also entere
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45

Zhou, Y. K., Z. H. Zheng, R. Li, Y. Li, and M. L. Wang. "Preparation and Analysis of Nano-Palygorskite and its Modified PF." Applied Mechanics and Materials 10-12 (December 2007): 312–16. http://dx.doi.org/10.4028/www.scientific.net/amm.10-12.312.

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This paper introduce a way to prepare Guizhou palygorskite mineral nanoparticles by dry-wet ball milling and modified its surface, with adding it in pre-polymer and dispersing with supersonic disperser. Then it introduced preparing the tung oil phenolic-formaldehyde (TPF)/ nano-palygorskite composite resin by situ. The TENSOR27 IR and JEM-2000FX II test shown that the nano-palygorskite particles embedded in the polymer and they were more evenly dispersed. By NETZSCHSTA409 thermal analyzer for TG analysis, the elevated of compound PF has been enhanced.
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46

Kadİr, S., M. Eren, T. Külah, N. Önalgİl, M. Cesur, and A. Gürel. "Genesis of Late Miocene-Pliocene lacustrine palygorskite and calcretes from Kırşehir, central Anatolia, Turkey." Clay Minerals 49, no. 3 (2014): 473–94. http://dx.doi.org/10.1180/claymin.2014.049.3.09.

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AbstractThis paper addresses the mineralogy, geochemistry, and genesis of palygorskite and associated calcretes in the Kırşehir region. In this area, the Quaternary calcretes are present within and/or on lacustrine mudstones of the Kızılırmak Formation (Late Miocene-Pliocene). The calcretes occur in the form of nodules, tubes, fracture-infills, and hard laminated crusts (hardpans). Calcrete samples are predominantly composed of calcite associated with smectite, quartz, feldspar, and minor palygorskite. The lacustrine mudstone samples consist mainly of smectite and palygorskite with minor calci
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47

Silva, Vanderlane C., Maria Eduarda B. Araújo, Alisson M. Rodrigues, Juliana M. Cartaxo, Romualdo R. Menezes, and Gelmires A. Neves. "Adsorption Behavior of Acid-Treated Brazilian Palygorskite for Cationic and Anionic Dyes Removal from the Water." Sustainability 13, no. 7 (2021): 3954. http://dx.doi.org/10.3390/su13073954.

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The effect of acid treatment on the adsorptive capacity of a Brazilian palygorskite to remove the crystal violet (CV) and congo red (CR) dyes was investigated. The raw palygorskite was acid-treated by different HCl solutions (2, 4, and 6 mol/L). The modifications on the palygorskite structure were investigated using X-ray diffraction, X-ray fluorescence, Fourier-transform infrared spectroscopy, N2 adsorption/desorption, and thermogravimetric and differential thermal analysis. The efficiency of CV and CR adsorption was investigated, and the effect of the initial concentration, contact time, pH,
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48

Li, Jianrui, and Yingming Xu. "Immobilization of Cadmium by Fulvic Acid-Modified Palygorskite and Plant and Soil Metabolism Responses." Toxics 13, no. 2 (2025): 68. https://doi.org/10.3390/toxics13020068.

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This experiment was designed to investigate the immobilization effect of fulvic acid-modified palygorskite on cadmium (Cd) and evaluate metabolism responses in plants in terms of chlorophyll, proline, and soluble protein and in soils in terms of microorganism number and enzymatic activity. The characteristics of the specific surface area and X-ray diffraction (XRD) spectra of modified palygorskite were analyzed to obtain information on the clay structure. The infrared (IR) spectrum characteristics of modified palygorskite and Cd adsorption products were analyzed to study the Cd immobilization
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49

Zou, Jian Guo, Ping Luo, Yan Yan Liu, and Hai Long Peng. "Preparation and Catalytic Performance of Ce-Y-Palygorskite Catalysts for NO Decomposition." Advanced Materials Research 197-198 (February 2011): 874–77. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.874.

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Ce-Y-palygorskite catalysts were prepared by chemical blending method. The effect of preparation conditions on catalytic performance of Ce-Y-palygorskite catalyst for NO decomposition was investigated in a fixed bed flow reactor. The characteristics of the Ce-Y-palygorskite catalysts were studied by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). The obtained results provided substantial evidence that the catalysts preparation conditions would have strong effect on the catalytic activity for NO decomposition. The Ce-Y-palygorskite catalyst prepared under the optima
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Ma, Quan Hong, Mei Yan Qu, Xue Song Xu, and Le Le Hu. "Influence of Layered Materials on Properties of Cement Stabilized Macadam." Advanced Materials Research 1095 (March 2015): 254–57. http://dx.doi.org/10.4028/www.scientific.net/amr.1095.254.

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To reduce shrinkage cracks of cement stabilized macadam base and prolong the life span of pavement, layered materials were mixed in cement stabilized macadam to improve its strength properties and crack resistance. In comparison with the blank test, the unconfined compressive strength increases with the addition of layered materials (weighed at 10% of the amount of cement), by 11.6% with palygorskite, 12.7% with kaolin and 8.9% with montmorillonite, respecetively, at the curing age of 28 days; dry-shrinkage coefficient reduces by 28.2% with palygorskite, 19.0% with kaolin and 14.2% with montmo
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