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Zn-Ti-Al layered double hydroxides synthesized from aluminum saline slag wastes as efficient drug adsorbents
https://orcid.org/0000-0001-9323-5981
Abstract This work reports the synthesis of Zinc-Titanium-Aluminum (ZnTiAl) layered double hydroxides (LDH) with various proportions of AlTi and a Zn/(AlTi) molar ratio of 3:1 by the co-precipitation method. Two series, made with commercial aluminum (Al) and aluminum extracted from saline slags (Al*), have been considered. Structural characterization and comparison of the two series has been made using powder X-ray diffraction (PXRD), Nitrogen physisorption at 77 K, Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Thermogravimetry measurements. The adsorption capacity of diclofenac and salicylic acid, as examples of emergent pollutants, by the different LDH on batch and fixed-bed column experiments has been analyzed. The effect of various parameters, such as the pH, the initial concentration of pollutant, the mass of adsorbent and the contact time, on the sorption behavior were studied and compared. The contact time to attain equilibrium for maximum adsorption was found to be between 100 and 400 min. The kinetic and equilibrium results were correlated to several adsorption and isotherm equation models. The synthesized materials were more effective in removing diclofenac than salicylic acid, being Zn6Al*2 the hydrotalcite that showed the highest adsorption capacity. The results showed a new application of a material obtained from the valorization of an industrial waste such as aluminum saline slags.
Graphical abstract Display Omitted
Highlights Saline slag wastes containing Al were valorized by the synthesis of hydrotalcites. Various mole ratios of AlTi were considered in the synthesis of ZnTiAl-hydrotalcites. ZnTiAl-hydrotalcites were used as adsorbents of diclofenac and salicylic acid, as model molecules of emerging contaminants.
Zn-Ti-Al layered double hydroxides synthesized from aluminum saline slag wastes as efficient drug adsorbents
https://orcid.org/0000-0001-9323-5981
Abstract This work reports the synthesis of Zinc-Titanium-Aluminum (ZnTiAl) layered double hydroxides (LDH) with various proportions of AlTi and a Zn/(AlTi) molar ratio of 3:1 by the co-precipitation method. Two series, made with commercial aluminum (Al) and aluminum extracted from saline slags (Al*), have been considered. Structural characterization and comparison of the two series has been made using powder X-ray diffraction (PXRD), Nitrogen physisorption at 77 K, Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Thermogravimetry measurements. The adsorption capacity of diclofenac and salicylic acid, as examples of emergent pollutants, by the different LDH on batch and fixed-bed column experiments has been analyzed. The effect of various parameters, such as the pH, the initial concentration of pollutant, the mass of adsorbent and the contact time, on the sorption behavior were studied and compared. The contact time to attain equilibrium for maximum adsorption was found to be between 100 and 400 min. The kinetic and equilibrium results were correlated to several adsorption and isotherm equation models. The synthesized materials were more effective in removing diclofenac than salicylic acid, being Zn6Al*2 the hydrotalcite that showed the highest adsorption capacity. The results showed a new application of a material obtained from the valorization of an industrial waste such as aluminum saline slags.
Graphical abstract Display Omitted
Highlights Saline slag wastes containing Al were valorized by the synthesis of hydrotalcites. Various mole ratios of AlTi were considered in the synthesis of ZnTiAl-hydrotalcites. ZnTiAl-hydrotalcites were used as adsorbents of diclofenac and salicylic acid, as model molecules of emerging contaminants.
Zn-Ti-Al layered double hydroxides synthesized from aluminum saline slag wastes as efficient drug adsorbents
https://orcid.org/0000-0001-9323-5981
Abstract This work reports the synthesis of Zinc-Titanium-Aluminum (ZnTiAl) layered double hydroxides (LDH) with various proportions of AlTi and a Zn/(AlTi) molar ratio of 3:1 by the co-precipitation method. Two series, made with commercial aluminum (Al) and aluminum extracted from saline slags (Al*), have been considered. Structural characterization and comparison of the two series has been made using powder X-ray diffraction (PXRD), Nitrogen physisorption at 77 K, Scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and Thermogravimetry measurements. The adsorption capacity of diclofenac and salicylic acid, as examples of emergent pollutants, by the different LDH on batch and fixed-bed column experiments has been analyzed. The effect of various parameters, such as the pH, the initial concentration of pollutant, the mass of adsorbent and the contact time, on the sorption behavior were studied and compared. The contact time to attain equilibrium for maximum adsorption was found to be between 100 and 400 min. The kinetic and equilibrium results were correlated to several adsorption and isotherm equation models. The synthesized materials were more effective in removing diclofenac than salicylic acid, being Zn6Al*2 the hydrotalcite that showed the highest adsorption capacity. The results showed a new application of a material obtained from the valorization of an industrial waste such as aluminum saline slags.
Graphical abstract Display Omitted
Highlights Saline slag wastes containing Al were valorized by the synthesis of hydrotalcites. Various mole ratios of AlTi were considered in the synthesis of ZnTiAl-hydrotalcites. ZnTiAl-hydrotalcites were used as adsorbents of diclofenac and salicylic acid, as model molecules of emerging contaminants.
Zn-Ti-Al layered double hydroxides synthesized from aluminum saline slag wastes as efficient drug adsorbents
Santamaría, L. (Autor:in) / López-Aizpún, M. (Autor:in) / García-Padial, M. (Autor:in) / Vicente, M.A. (Autor:in) / Korili, S.A. (Autor:in) / Gil, A. (Autor:in)
Applied Clay Science ; 187
30.01.2020
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Mg–Al layered double hydroxides modified clay adsorbents for efficient removal of Pb
| Online Contents | 2016
| Wiley | 2020