Optimization of silica-modified titanate nanotubes (TNT-SiO₂) synthesis for efficient Pb(II) and Cd(II) adsorption - Université de Lorraine Access content directly
Journal Articles Applied physics. A, Materials science & processing Year : 2023

Optimization of silica-modified titanate nanotubes (TNT-SiO₂) synthesis for efficient Pb(II) and Cd(II) adsorption

Abstract

In this work, silica-modified titanate nanotubes (TNTs-SiO2) were prepared via a hydrothermal process using tetraethylorthosilicate (TEOS) and anatase TiO 2 as precursors. A design of experiments (DOE) using a two-level fractional factorial design was applied to study the effect of the TiO2/TEOS molar ratio, reaction temperature and time on the Brunauer–Emmett–Teller (BET) specific surface area (Y) of TNTs-SiO 2 , the objective being to maximize Y (Ymax). Our results show that the BET specific surface area is highly affected by the TEOS amount and by the reaction temperature, the highest value being 312.735 m 2 /g with a pore volume of 0.91 cm 3 /g which corresponds to the TNTs-SiO 2 07 sample. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images show the formation of TNTs with a length of several hundred nanometers and 8 and 10 nm in internal and external diameter, respectively, after 6 h of reaction at 150 °C. According to Fourier transform infrared (FT-IR) and energy-dispersive X-ray spectroscopy (EDX) analyses, Si is well incorporated into the TNTs. The TNTs-SiO 2 07 sample was applied as an adsorbent of Pb(II) and Cd(II) ions. The response surface methodology (RSM) via Box–Behnken design (BBD) was used to optimize the removal efficiency of Pb(II) (RPb %) and of Cd(II) (RCd %) and to study the influence of the initial metal concentration, of the adsorbent mass and of the pH on the responses. The Pb(II) and Cd(II) removals follow the Freundlich model (R2 = 0.999 and 0.996, respectively) and pseudo-second-order kinetics (R2 = 0.9). The maximum adsorption capacity was estimated to be 689.655 mg/g for Pb(II) and 338.983 mg/g for Cd(II). This article highlights the significant improvement in the structural properties of TNTs-SiO 2 and their adsorption efficiency of Pb(II) and Cd(II) ions.
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Dates and versions

hal-03931850 , version 1 (09-01-2023)

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F. Djabelkhir, Bilel Chouchene, H. Belkacemi, Ghouti Medjahdi, R. Schneider, et al.. Optimization of silica-modified titanate nanotubes (TNT-SiO₂) synthesis for efficient Pb(II) and Cd(II) adsorption. Applied physics. A, Materials science & processing, 2023, 129 (2), pp.90. ⟨10.1007/s00339-022-06360-9⟩. ⟨hal-03931850⟩
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