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

Abstract

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.

Synthesis of magnetic chrysotile nanotubes for adsorption of Pb(II), Cd(II) and Cr(III) ions from aqueous solution

“…Previous studies have shown that the pH and materials composition can affect the chrysotile structure and crystalline phase [19,20]. The experimental conditions and results of saturation magnetization (Ms) are listed in Table 1.…”

On an adsorption/photocatalytic performance of nanotubular Mg3Si2O5(OH)4/TiO2 composite

“…Flexible capabilities of chemical composition tuning -for example, by introducing various d-elements like Ni [18][19][20], Co [21], Fe [22][23][24] -and synthesis conditions allows to control surface properties (active sites) and area [25]. Hydroxyl groups reached surface together with the inner channel make chrysotile nanotubes favorable for adsorption and immobilization of various molecules [26][27][28] and heavy metal ions of Pb, Cd, Sr, and Nd [29][30][31][32].…”