Direct evidence of transformation from smectite to palygorskite: TEM investigation

Chen, Tianhu; Xu, Huifang; Lu, Anhuai; Xu, Xiangde; Peng, Shuchuan; Shu-cang, Yue

doi:10.1360/03yd0509

Cited by 34 publications

(22 citation statements)

References 14 publications

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“…Both dolomite and palygorskite are authigenic minerals because they form in similar environments (Chen et al, 2004a;Xie et al, 2013). The unique layer-chained structure and nano-rod appearance of palygorskite make it an excellent adsorbent, thixotropic agent, and thickening agent, among others (Chen et al, 2004b;Galan and Singer, 2011).…”

Section: Introductionmentioning

confidence: 99%

The thermochemical activity of dolomite occurred in dolomite–palygorskite

Xie

Chen

Xing

et al. 2016

Applied Clay Science

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Section: Introductionmentioning

confidence: 99%

The thermochemical activity of dolomite occurred in dolomite–palygorskite

Xie

Chen

Xing

et al. 2016

Applied Clay Science

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“…Because of its developed interior channels and large specific surface area, and thus considerable adsorption capacity, palygorskite clay has been studied for the application as one of environmental mineral absorbents (Fan et al, 1989;Chen et al 1995;Qiu et al, 1995Qiu et al, , 1997Song et al, 1998;Garcia et al, 1999a. However, there are some impurities in pal ygorskite clay, such as montmorillonite, illite, carbonates, fine-grained quartz and feldspar, which seriously interfere the understanding of the experimental results of adsorption and mechanism of interface interaction between palygorskite and organic matter (Chen, 2000b(Chen, , 2001Chen et al, 2004b). However, there are some impurities in pal ygorskite clay, such as montmorillonite, illite, carbonates, fine-grained quartz and feldspar, which seriously interfere the understanding of the experimental results of adsorption and mechanism of interface interaction between palygorskite and organic matter (Chen, 2000b(Chen, , 2001Chen et al, 2004b).…”

Section: Introductionmentioning

confidence: 99%

“…b;Chen, 2000a;Murray, 2000; Alvarez-Ayuso and Garcia-Sanchez, 2003). However, there are some impurities in pal ygorskite clay, such as montmorillonite, illite, carbonates, fine-grained quartz and feldspar, which seriously interfere the understanding of the experimental results of adsorption and mechanism of interface interaction between palygorskite and organic matter (Chen, 2000b(Chen, , 2001Chen et al, 2004b). Up to now, few researches have reported on purified palygorskite adsorption kinetics and interface interaction between organic matter and purified palygorskite.…”

Section: Introductionmentioning

confidence: 99%

Adsorption Kinetics of Methylene Blue from Aqueous Solutions onto Palygorskite

Peng

Wang

Chen

et al. 2010

Acta Geologica Sinica - English Edition

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The adsorption kinetics of methylene blue from aqueous solutions on purified palygorskite was investigated. The kinetics data related to the adsorption of methylene blue from aqueous solutions are in good agreement with the pseudo-second order equation in ranges of initial concentration of 120-210 m&, oscillation speed of 100-200 r/min and temperature of 298-328K. The experimental results show that methylene blue is only adsorbed onto the external surface of purified palygorskite, and the apparent adsorption activation energy is 13.92 k,J/mol. The relatively low apparent adsorption activation energy suggests that the adsorption of rnethylene blue involves in not only a chemical, but also a physical adsorption process, and it is controlled by the combination of chemical adsorption and liquid-film diffusion.purified palygorskite was investigated in this paper. m e aims of this study are as follows: on one hand, to gain a few basic parameters of industrial application and, on the other hand, to make a preliminary discussion on the adsorption mechanism. The result is of great significance for accurately understanding the mechanisms of mineral adsorption of organic matter. mineral properties and industrial applications of pal ygorskite, and environmental geochemical processes. Experiments Instruments and element analysisThe X-ray diffraction (XRD) analysis was done by using a D/MAX-RB diffractometer using Cu-Ka radiation at 40 kV, 100 mA and 4"/min.The "EM analysis was carried out by means of a JEOL20 10 High-resolution Transmission Electron Microscope equipped with an ISIS X-ray spectrometer, so TEM micrographs can be obtained and meanwhile elements can be identified by the Selected Area Electron Diffraction (SAED) and Energy Dispersive Spectra (EDS) analysis. All the relevant work has been done in the

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“…TEM samples were prepared with ethanol suspension and ultrasonic dispersive (Chen et al, 2004b). A JEOL-2010 HRTEM was used for obtaining TEM images, electronic diffraction patterns, and X-ray energy-dispersive spectra.…”

Section: Methodsmentioning

confidence: 99%

“…A JEOL-2010 HRTEM was used for obtaining TEM images, electronic diffraction patterns, and X-ray energy-dispersive spectra. TEM samples were prepared with ethanol suspension and ultrasonic dispersive (Chen et al, 2004b). BET surface area analysis was carried out with a SA3100TM surface area analysis instrument.…”

Section: Methodsmentioning

confidence: 99%

Structural Evolvement of Heating Treatment of Mg/Al-LDH and Preparation of Mineral Mesoporous Materials

Chen

Wang

et al. 2010

Acta Geologica Sinica - English Edition

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Although hydrotalcite, or layered double hydroxides (LDHs), is not a common mineral, it is an important material that can be easily synthesized in laboratory. In this study, structural evolvement and BET surface area changes of heat treated MdAI-LDH is evaluated by XRD, TEM and N2-BET analyses. The results indicate that the magnesium-aluminum LDH with carbonate as interlayer anion, periclase-like oxides was formed at temperatures of 400-8OO0C. Meanwhile, 2-3 nanometer mesoporous were formed during decomposition of LDH. However, the heat treated samples still preserve the morphology of the original LDI1 plates. Periclase-like formed from LDII heat treatment may re-hydrolyze and recover the structure of LDH. However, crystallinity of the recovered LDH is lower than that of the original LDH. This heat treatment will result in formation of (Mg, A1)-oxide nano-crystals and nanopores among the nano-crystals. When heating temperature exceeds 1000, the periclase-like (Mg, Al)-oxide is transformed into a composite with periclase (hlgO) and spinel phases. The periclase can be re-hydrolyzed and dissolved in HCI solution. After acid treatment, the sample with a high surface area is composed of spinel nano-crystals and nanopores among them. Our results will provide a new and economic way to synthesize mesoporous materials through pathways of phase transformation of precursor materials with different composition.

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Direct evidence of transformation from smectite to palygorskite: TEM investigation

Cited by 34 publications

References 14 publications

The thermochemical activity of dolomite occurred in dolomite–palygorskite

The thermochemical activity of dolomite occurred in dolomite–palygorskite

Adsorption Kinetics of Methylene Blue from Aqueous Solutions onto Palygorskite

Structural Evolvement of Heating Treatment of Mg/Al-LDH and Preparation of Mineral Mesoporous Materials

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