Effect of attapulgite colloids on uranium migration in quartz column

Du, Linfang; Wang, Ping; Li, Xiaolong; Tan, Zhijian

doi:10.1016/j.apgeochem.2018.11.009

Cited by 24 publications

(5 citation statements)

References 40 publications

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“…Palygorskite has received considerable attention in the fields of pigments, 5,6 decolorizing agent, 7,8 thickeners, 9,10 colloid, 11,12 mycotoxin adsorbents, [13][14][15][16][17] radioactive material adsorbents, [18][19][20][21] and drilling muds 22,23 for the large number of channels in its internal structure. 24 At the same time, it is widely used in friction materials, 25,26 carrier, 27 catalytic materials, 28 rubber, and plastic composites 29,30 because of the nano-scaled slender rod crystals.…”

Section: Introductionmentioning

confidence: 99%

Microstructural evolution and sintering properties of palygorskite nanofibers

Wang

Lijuan

Zhang

et al. 2020

Int J Applied Ceramic Tech

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In this study, the morphological evolution and sintering properties of the palygorskite nanofibers were studied along with the increase of temperature, using raw palygorskite as materials. The palygorskite powder was calcined at different temperatures in the range of 100°C‐1200°C, and the microstructural evolution of the palygorskite nanofibers was investigated by thermogravimetric and differential thermal analysis (TG‐DTA), X‐ray diffraction (XRD), scanning electron microscopy (SEM), and high‐resolution transmission electron microscope (HRTEM). Furthermore, the palygorskite powder was shaped to bars by dry pressing and sintered from 700°C to 1200°C. The properties of the sintered palygorskite were characterized by bending strength, mercury intrusion porosimeter (MIP), and stepwise isothermal dilatometry (SID). The results showed that the morphology of palygorskite nanofibers maintained unchanged till 1000°C. The palygorskite nanofibers molted to bind each other and formed a solid interwoven network structure at 1100°C. Correspondingly, it was shown from the sharply decrease of the sintered palygorskite porosity from 45.46% at 1000°C to 1.82% at 1100°C that the dense sintering of palygorskite started at 1100°C. With the sintering proceeding, some closed micropores fused each other to form bigger opening pores, resulting in a slight increase of porosity at 1200°C. However, the pore size distribution got more uniform and the density of the sintered body increased. So the bending strength of the sintered body reached the maximum of 176.67 Mpa and finally the main crystalline phases of the sintered sample changed to quartz, enstatite, and kyanite. The sintering activation energy of the palygorskite was measured by means of SID with a value of 906.46 kJ·mol−1.

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Section: Introductionmentioning

confidence: 99%

Microstructural evolution and sintering properties of palygorskite nanofibers

Wang

Lijuan

Zhang

et al. 2020

Int J Applied Ceramic Tech

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“…Figure a 1 shows the IR absorption characteristic peaks of ATP sample, where the peaks at 3556 and 3405 cm –1 originate from the O–H stretching vibrations of interlayer water and surface hydroxylation of pristine ATP . The broader and sharp band is observed at 1653, 1029, and 467 cm –1 which can be accounted for the surface-adsorbed or interlayer water, the antisymmetric stretching vibration of (Mg, Al)–Si–O, and the asymmetric stretching modes of Si–O–Si. − Especially for the band at 1448 cm –1 , which resulting from the associated mineral of ATP clay, is classified as calcite . After surface bridging and polypyrrole shell building stage, the obtained Fe/ATP@PPy exhibits similar but narrow and weak absorption bands associated with ATP of approximately the same wave numbers.…”

Section: Resultsmentioning

confidence: 99%

Selective Adsorbent Design with Multifunctional Surfaces: Innovating Solutions for Heterogeneous Catalysis in Water

Wang,

Liang,

Liu

et al. 2024

Langmuir

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Heterogeneous catalytic systems with water as the solvent often have the disadvantage of cross-contamination, while concerns about the purification and workup of the aqueous phase after reactions are rare in the lab or industry. In this context, designing and developing the functional selective solid adsorbent and revealing the adsorption mechanism can provide a new strategy and guidelines for constructing supported heterogeneous catalysts to address these issues. Herein, we report the stable composite adsorbent (Fe/ATP@PPy: magnetic Fe 3 O 4 /attapulgite with the polypyrrole shell) that features an integrated multifunctional surface, which can effectively tune the selective adsorption processes for Cu 2+ , Co 2+ , and Ni 2+ ions and nitrobenzene via the cooperative chemisorption/physisorption in an aqueous system. The adsorption experiments showed that Fe/ATP@PPy displayed significantly higher adsorption selectivity for Ni 2+ than Cu 2+ and Co 2+ ions, especially which exhibited an approximate 100.00% removal for both Ni 2+ ions and nitrobenzene in the mixture system with a low concentration. Furthermore, combined tracking adsorption of Ni 2+ ions and X-ray photoelectron spectroscopy characterization confirmed that the effective adsorption occurs via ion transfer coordination; the pathway was further validated at the molecular level through theoretical modeling. In addition, the selective adsorption mechanism was proposed based on the adsorption experiment, characterization, and the corresponding density functional theory calculation.

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“…The spectrum of ATP showed peaks at 3620 cm −1 that represented the stretching vibrations of Al–OH, and the peaks at 3432 cm −1 and 1635 cm −1 were attributed to the bend vibration of the zeolite water. The peaks at 1031 cm −1 and 467 cm −1 were attributed to the asymmetric stretching modes of Si–O–Si, whereas the peak at 796 cm −1 might have corresponded to the stretching vibration of Al–O–Si [33].…”

Section: Resultsmentioning

confidence: 99%

Fast Removal of Propranolol from Water by Attapulgite/Graphene Oxide Magnetic Ternary Composites

Deng

Nie

et al. 2019

Materials

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In this work, a novel adsorbent attapulgite/graphene oxide magnetic composite (ATP/Fe3O4/GO) was synthesized for removing propranolol (PRO) from aqueous water. The factors affecting the PRO adsorption process onto ATP/Fe3O4/GO including pH, ionic strength, sorbent dosage, and humic acid were systematically investigated by batch experiments. Meanwhile, magnetic attapulgite (ATP/Fe3O4) and magnetic graphene oxide (GO/Fe3O4) were prepared for the comparison of the adsorption performance for PRO. The structural and surface characteristics of the resulting materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential measurements, and scanning electron microscope. The results showed that the adsorption rate of PRO onto ATP/Fe3O4/GO was up to 99%, faster and higher than that of other adsorbents involved at neutral pH. Moreover, the adsorption kinetics were better fitted with pseudo-first-order kinetic model than the second-order kinetic model. The adsorption data were fitted well with the Freundlich isotherm equations, implying that the adsorption process was heterogeneous. The adsorption reaction was endothermic and spontaneous according to the thermodynamic parameters. All results indicated that ATP/Fe3O4/GO was a promising adsorbent for removing PRO from water.

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Effect of attapulgite colloids on uranium migration in quartz column

Cited by 24 publications

References 40 publications

Microstructural evolution and sintering properties of palygorskite nanofibers

Microstructural evolution and sintering properties of palygorskite nanofibers

Selective Adsorbent Design with Multifunctional Surfaces: Innovating Solutions for Heterogeneous Catalysis in Water

Fast Removal of Propranolol from Water by Attapulgite/Graphene Oxide Magnetic Ternary Composites

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