Adsorption of lead (II) on SBA-15 mesoporous molecular sieve functionalized with –NH2 groups

Hernández-Morales, V.; Nava, R.; Acosta-Silva, Y.J.; Macías-Sánchez, S.A.; Pérez-Bueno, J.J.; Pawelec, B.

doi:10.1016/j.micromeso.2012.05.004

Cited by 171 publications

(108 citation statements)

References 55 publications

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“…The loss of mass observed at low temperature is produced by desorption of physisorbed water molecules on the solid, a process that ends at &130°C. The functionalized samples present a second peak, which is much higher than for MSSP, and can be ascribed to the elimination of the aminopropyl grafted groups [31,34,35]. For MSSP-APS this second peak, starts at about 220°C, while for MSSP-APSw it appears at about 300°C, ending in all samples at approximately 650°C.…”

Section: Chromium Desorption and Reutilizationand Stability Of The Mementioning

confidence: 87%

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 Mementioning

confidence: 87%

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

et al. 2015

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“…The exposed surfaces of the microspheres become negatively charged, favoring Pb(II) ion sorption. For this case, a mechanism similar to that of exchange interactions published before [ 15 ] is proposed. Note that the Pb(II) sorption capacities of our OCB sorbents compare very favorably to those values (Table S2, Supporting Information) reported for Zn 2 GeO 4 -ethylenediamine hybrid nanoribbons (74.6 mg g −1 ), [ 2 ] sulfonated polyphenyldiamine (91.8 mg g −1 ), [ 16 ] longan shell (52.1 mg g −1 ), [ 17 ] polyvinylbutyral microbeads (86.2 mg g −1 ), [ 18 ] polysulfoaminoanthraquinone nanoparticles (89.6 mg g −1 ), [ 19 ] diethylenetriamine-bacterial cellulose (22 mg g −1 ), [ 20 ] meranti sawdust (34.3 mg g −1 ), [ 21 ] thiol-functionalized ceramic hybrids (22.4 mg g −1 ), [ 22 ] activated carbon (4.77 mg g −1 ), [ 23 ] titanosilicate ETS-10 (56.3 mg g −1 ), [ 24 ] and cellulose-chitosan hydrogels (28.1 mg g −1 ).…”

Section: Resultsmentioning

confidence: 85%

Macrocyclic Amine‐Linked Oligocarbazole Hollow Microspheres: Facile Synthesis and Efficient Lead Sorbents

Liao

Cai

Huang

et al. 2014

Macromol. Rapid Commun.

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Novel macrocyclic amine-linked oligocarbazole hollow microspheres are synthesized via a one-step oxidative method in aqueous solution. Upon altering the oxidants and acidic media, the average diameters of the obtained hollow microspheres are tunable from 0.23 to 2.0 μm. With attractive amine and carbazole functionalities, exposed surface area, thermostability, and photoluminescent properties, the amine-linked oligocarbazole hollow microspheres are directly assembled to yield heavy metal sorbents with excellent selectivity and recyclability, shown to efficiently remove lead from contaminated water.

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“…A good fit can be further confirmed by the fact that the calculated q e value is very close to the measured one. Therefore, MB adsorption on the Schiff-base/SBA-15 nanoadsorbent is able to explain experimental data at most conditions according to the pseudo-second-order kinetic model (Hernández-Morales et al 2012). Weber's intraparticle diffusion model is used to further identify the steps of adsorption process.…”

Section: Kinetic Modelsmentioning

confidence: 93%

“…In the first method, the functional silane is added to a mixture of tetraethoxysilane and surfactant, with a concomitant formation of the final functionalized structure. In the second method, the ordered mesoporous skeleton is first obtained, and the desired silane is added to the suspension in a second step to result in the final functional solid (Tang et al 2011;Hernández-Morales et al 2012;Li et al 2014). Recently, Bardajee et al (2013) reported the use of SBA-15 containing a Schiff-base ligand as a catalyst for the synthesis of 2, 3-disubstituted quinoxalines and pyridopyrazine derivatives.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of a novel Schiff-base/SBA-15 nanoadsorbent for removal of methylene blue from aqueous solutions

Bardajee

Hooshyar

Shahidi

2014

Int. J. Environ. Sci. Technol.

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A novel Schiff-base/SBA-15 nanoadsorbent was successfully synthesized by the reaction of salicylaldehyde and (3-aminopropyl) trimethoxysilane in methanol and subsequent grafting with SBA-15. The morphology and structures of the as-synthesized Schiff-base/SBA-15 nanoadsorbent were characterized by powder X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, thermo-gravimetric analysis, and N 2 adsorption/desorption isotherms. The obtained Schiff-base/SBA-15 nanoadsorbent was used for the removal of methylene blue (MB) from aqueous solutions. The effects of various parameters such as temperature, concentration, pH, and contact time were examined, and optimal experimental conditions were determined. The equilibrium isotherms were conducted using Freundlich and Langmuir models. The pseudo-first-order, pseudosecond-order, and intraparticle diffusion models were used to fit adsorption data in the kinetic studies. The thermodynamic parameters such as the standard enthalpy, standard entropy, and standard free energy were evaluated. The obtained results indicated that the Schiff-base/SBA-15 nanoadsorbent is an efficient adsorbent for removing MB.

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Adsorption of lead (II) on SBA-15 mesoporous molecular sieve functionalized with –NH2 groups

Cited by 171 publications

References 55 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

Macrocyclic Amine‐Linked Oligocarbazole Hollow Microspheres: Facile Synthesis and Efficient Lead Sorbents

Synthesis and characterization of a novel Schiff-base/SBA-15 nanoadsorbent for removal of methylene blue from aqueous solutions

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