An investigation on the behaviors of thorium(IV) adsorption onto chrysotile nanotubes

Cheng, Leilei; Zhai, Long; Liao, Wenjuan; Huang, Xuan; Niu, Baicheng; Yu, Shaoming

doi:10.1016/j.jece.2014.05.014

Cited by 19 publications

(6 citation statements)

References 26 publications

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“…At pH>pH pzc the ChNTs surface becomes negatively charged favouring the adsorption of cationic species. With increasing pH, the negatively charged HA is difficult to be adsorbed on negatively charged of ChNTs [5,16,17]. Results show that the presence of HA, dissolved in solution or bound onto mineral surfaces, considerably influenced the fixation of heavy metals, depending on mineral type, humic concentration and specific metal-ion [30].…”

Section: Effect Of Ph and Ionic Strength/hamentioning

confidence: 99%

“…The most common isotherms applied in solid/liquid system are Langmuir and Freundlich isotherm models [17]. Langmuir where K F (mg 1−n L n g −1 ) represents the adsorption capacity when the equilibrium concentration of adsorbate equals to 1, and n represents the degree of adsorption dependent on the equilibrium concentration.…”

Section: Adsorption Isothermmentioning

confidence: 99%

“…[15] Recently, increasing attention has been played to the synthesis, structural characterization, and application of chrysotile nanotubes (ChNTs) [15,16]. However, few researches have done on the adsorption behavior of heavy metal ions onto ChNTs [17].…”

Section: Introductionmentioning

confidence: 99%

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Facile Synthesis and Characterization of Chrysotile Nanotubes and Their Application for Lead(II) Removal from Aqueous Solution

Cheng

Ren

Wei

et al. 2014

Separation Science and Technology

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Chrysotile nanotubes (ChNTs) were synthesized using the hydrothermal method and characterized by XRD, XPS, SEM, TEM and N2 adsorption-desorption. The results of XRD analysis confirm that the synthetic samples own the pure monoclinic chrysotile. The morphology images show that ChNTs have a hollow nanotubular structure. A batch experiment was employed to evaluate the adsorption efficiency of ChNTs toward Pb(II). The kinetic adsorption of Pb(II) on ChNTs can be described by a pseudo-second-order model very well. The adsorption of Pb(II) on ChNTs are strongly dependent on pH and ionic strength. The adsorption isotherms Downloaded by [University of Nebraska, Lincoln] at 17:56 02 February 2015 A c c e p t e d M a n u s c r i p t 2 are fitted well by Langmuir model, having a maximum adsorption capacity of 25.08 mg·g−1 at 298 ± 1 K. The thermodynamic parameters of the adsorption for Pb(II) indicate that the adsorption process of Pb(II) on ChNTs is spontaneous and endothermic. Herein, this finding suggests that ChNTs can be applied on the preconcentration of Pb(II) in the field of water treatment.

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Section: Effect Of Ph and Ionic Strength/hamentioning

confidence: 99%

Section: Adsorption Isothermmentioning

confidence: 99%

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Facile Synthesis and Characterization of Chrysotile Nanotubes and Their Application for Lead(II) Removal from Aqueous Solution

Cheng

Ren

Wei

et al. 2014

Separation Science and Technology

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“…At pH values less than 3, Th 4+ ions exist as the major species. At pH values beyond 4, the hydrolysis products as well as the precipitation begin to play a role in the adsorption of Th(IV) [27,28]; so, the uptake percentage maintains constancy with increasing pH above 4.0. To avoid precipitation, a solution pH of 3 and 4 for Th(IV) and U(VI) was used for further experiments [3].…”

Section: Effect Of Initial Phmentioning

confidence: 99%

The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite

2019

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The sorption of uranium and thorium from their aqueous solutions by using 8-hydroxyquinoline modified Na-bentonite (HQ-bentonite) was investigated by the batch technique. Na-bentonite and HQ-bentonite were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier Transform Infrared (FTIR) spectroscopy. Factors that influence the sorption of uranium and thorium onto HQ-bentonite such as solution pH, contact time, initial metal ions concentration, HQ-bentonite mass, and temperature were tested. Sorption experiments were expressed by Freundlich and Langmuir isotherms and the sorption results demonstrated that the sorption of uranium and thorium onto HQ-bentonite correlated better with the Langmuir isotherm than the Freundlich isotherm. Kinetics studies showed that the sorption followed the pseudo-second-order kinetic model. Thermodynamic parameters such as ΔH°, ΔS°, and ΔG° indicated that the sorption of uranium and thorium onto HQ-bentonite was endothermic, feasible, spontaneous, and physical in nature. The maximum adsorption capacities of HQ-bentonite were calculated from the Langmuir isotherm at 303 K and were found to be 63.90 and 65.44 for U(VI) and Th(IV) metal ions, respectively.

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“…5 Furthermore, noted should be the use of these products in the production of drinking water as a clarifying agent, as a powerful filtering agent, catalyst support, abrasive agent, anti-explosive agent, in the manufacture of refractory bricks used in thermal insulation, etc. 1,4,[6][7][8] For all these applications, the size, morphology, nature, and quantity of mineral impurities and obviously the surface properties are the factors that play a determining role. These examples show that mastering the use of diatomites requires better knowledge of their surface properties.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Chromatographic Media from Algerian Diatomite

Daoui-Bahar

Boutoumi

Bouhamidi

2022

Kemija U Industriji

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X-ray photoelectron spectrometry combined with FTIR spectroscopy, X-ray diffraction analysis (XRD), and scanning electron microscopy (SEM) allowed highlighting the different interactions of grafts or impregnated polymers on the mineral surface of diatomite obtained by treatment of raw diatomite under reflux with a 5 M solution of hydrochloric acid for 24 h. This acid treatment led to almost total elimination of organic impurities with a total decalcification of the diatomite, leading to its deferrization and partial dealumination, and the obtaining of a support with a homogeneous siliceous surface mainly constituted of Si−OH and Si−O−Si functional groups. The surface of the diatomite washed with HCl became totally saturated with PEG-20M and SE30 with respective impregnation rates of 5 and 2 %. However, the grafting and/or impregnation of this diatomite with octadecyltrichlorosilane (C18) and docosane (C22) led to the formation of perfectly homogeneous surfaces.

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An investigation on the behaviors of thorium(IV) adsorption onto chrysotile nanotubes

Cited by 19 publications

References 26 publications

Facile Synthesis and Characterization of Chrysotile Nanotubes and Their Application for Lead(II) Removal from Aqueous Solution

Facile Synthesis and Characterization of Chrysotile Nanotubes and Their Application for Lead(II) Removal from Aqueous Solution

The Removal of Uranium and Thorium from Their Aqueous Solutions by 8-Hydroxyquinoline Immobilized Bentonite

Preparation of Chromatographic Media from Algerian Diatomite

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