Abstract
A mesoporous titania material with a single X-ray diffraction signal at small-angle and anatase TiO2 walls was prepared by a sol–gel method using hexadecylamine as a templating agent and titanium isopropoxide as a titanium precursor. The mesoporous solid was used to prepare a novel layered titanium phosphate by Soxhlet extraction reflux with phosphoric acid. The obtained α-TiP material showed a typical wide-angle X-ray diffraction pattern with a monoclinic structure, N2 adsorption–desorption isotherms Type II, and large crystals of rectangular lamellae, confirming its layered nature by transmission electron microscopy. The elimination by adsorption of Hg2+ ions from aqueous samples was studied using Langmuir, Freundlich and Temkin models, calculating its different parameters. The adsorption of Hg2+ ions could be performed via active P-OH groups (observed by Fourier Transform Infrared results) in the lamellar structure showing excellent properties that make the layered material possible excellent adsorbent to remove heavy metals ions contaminants from potable water.
Highlights
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The synthesis of a novel layered titanium phosphate has been studied.
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A mesoporous titania prepared by sol–gel method was used as titanium source.
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The successful formation of the layered titanium phosphate in the alpha phase was confirmed by several characterization techniques.
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The adsorption experimental data for Hg2+ uptake from aqueous solutions were analyzed using the Langmuir, Freundlich, and Temkin models.
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The results propose the material might be an efficient adsorbent for wastewater treatment and water purification.
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The authors would like to acknowledge financial support by FONACIT through Project 2011001359, as well as the fine technical assistance of Pablo Quiroz and Oscar Zorrilla (XRD) from PDVSA-El Chaure, Yraida Díaz (nitrogen physisorption) from IVIC and Edgar Cañizales (TEM) from INTEVEP.
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Carvajal, M.E., Brito, J.L., Bastardo-González, E. et al. Adsorption properties of novel layered titanium phosphate prepared from mesoporous titania by sol–gel processing. J Sol-Gel Sci Technol 97, 431–440 (2021). https://doi.org/10.1007/s10971-020-05435-4
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DOI: https://doi.org/10.1007/s10971-020-05435-4