Aminopropyl-modified mesoporous silica SBA-15 as recovery agents of Cu(II)-sulfate solutions: Adsorption efficiency, functional stability and reusability aspects

Lombardo, M. Verónica; Videla, Monteverde; Calvo, Alejandra; Requejo, Félix G.; Soler-Illia, Galo J. A. A.

doi:10.1016/j.jhazmat.2012.04.049

Cited by 84 publications

(38 citation statements)

References 44 publications

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“…Then, the variations in the textural properties in MSSP-APSw can be explained considering some hierarchical polymerization of the organosilane grafted groups that cause a partial blockage a some pores decreasing S g and V p . The latter explanation has been recently reported even for SBA-15 systems with pore diameters larger than 5 nm [20]. Finally, the wall thickness showed a slight increase for MSSP-APSw in comparison with MSSP, in agreement with the variation recorded in D p as in can be seen in Table 1.…”

Section: Chromium Desorption and Reutilizationand Stability Of The Mesupporting

confidence: 89%

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Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

et al. 2015

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Aminopropyl-functionalized mesoporous silica spherical particles were obtained through post-synthetic route. The suitability of this material as an adsorbent for heavy metals from aqueous media was tested by Cr(VI) adsorption experiments performed at various pH conditions, chromium concentrations and time. The synthesized particles were characterized before and after functionalization by X-ray diffraction at low angles, nitrogen adsorptiondesorption isotherms, infrared Fourier transform spectroscopy, scanning electron microscopy and thermogravimetric analysis. It was found that Cr(VI) adsorption occurs more efficiently in the pH range between 2 and 3. As a consequence of the nanometer scale of the particles, concentration profiles do not develop inside of them and thus there are no diffusional restrictions within the pores, leading to a higher Cr(VI) adsorption than that previously reported for similar systems. Chromium desorption for material reutilization was carried out in basic media. Results showed that the amino groups were grafted successfully without mesostructure damage. These groups are essential for the metal ion removal and no significant leaching was observed after four use/regeneration/use cycles. The batch equilibrium data fitted well the Langmuir isotherm with a maximum adsorption capacity of 87.1 mg g -1 at 25°C. A discussion about the relationship between structure and its behavior as adsorbent, including regeneration and reusability, is given.

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Section: Chromium Desorption and Reutilizationand Stability Of The Mesupporting

confidence: 89%

“…The results show a high separation capacity for these adsorbents and the possibility of being regenerated and reused repeatedly [20][21][22][23]. Besides, both the macrostructure morphology and the size of the adsorbent particles have been found to affect the behavior in the separation process [24,25].…”

Section: Introductionmentioning

confidence: 88%

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

et al. 2015

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“…In Fig. 6b, the pure mesoporous silica KIT-6 have peaks of O [48] and typical of mesoporous silica materials [49]. However, for the functionalized silica KIT-6, we observed that their binding energy shifted to lower value for O 1s and Si 2p signal compared with KIT-6.…”

Section: Resultsmentioning

confidence: 77%

Mesoporous silica (KIT-6) derivatized with hydroxyquinoline functionalities as a selective adsorbent of uranium(VI)

Zhu

Shi

Song

et al. 2015

J Radioanal Nucl Chem

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Two modified mesoporous silica (KIT-6) materials for absorbing uranium(VI) were prepared respectively via post-grafting of 8-hydroxyquinoline and 8-hydroxyquinoline onto surface of KIT-6, which were characterized by FT-IR, NMR, TEM, and sorption/desorption analysis. Effect of pH values, contact time, ionic strength, solid-liquid ratio, temperature, and coexisting ions on sorption behavior of the modified KIT-6 were also investigated. Typical sorption isotherms (Langmuir and Freundlich) were used to determine the sorption process and the maximum U(VI) sorption capacity. The results indicate that the two modified KIT-6 exhibit better selective sorption of U(VI) as compared to the original KIT-6.

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“…It was then Soxhlet extracted with a mixture of ethanol and dichloromethane (1 : 1) in order to remove the residue of the silylating reagent. The material was dried at 70 °C under a vacuum overnight (Lombardo et al 2012;Shahbazi et al 2012). The way in which the SBA-15 was functionalized is schematically illustrated in Fig.…”

Section: Synthesis and Modification Of Sba-15 Mesoporous Silicamentioning

confidence: 99%

“…Adsorption data for naphthalene were fitted using the Langmuir and Freundlich isotherm equations. The Langmuir isotherm model assumes a surface with homogeneous binding sites, equivalent sorption energies and no interaction between the substances adsorbed (Lombardo et al 2012). The mathematical equation defining this model is:…”

Section: Batch Equilibrium Isotherm and Kinetic Experimentsmentioning

confidence: 99%

Comparison of the efficiency of mesoporous silicas as absorbents for removing naphthalene from contaminated water

Balati

Shahbazi

Amini

et al. 2014

European Journal of Environmental Sciences

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Aminopropyl-modified mesoporous silica SBA-15 as recovery agents of Cu(II)-sulfate solutions: Adsorption efficiency, functional stability and reusability aspects

Cited by 84 publications

References 44 publications

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water

Mesoporous silica (KIT-6) derivatized with hydroxyquinoline functionalities as a selective adsorbent of uranium(VI)

Comparison of the efficiency of mesoporous silicas as absorbents for removing naphthalene from contaminated water

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