Low-cost and effective phenol and basic dyes trapper derived from the porous silica coated with hydrotalcite gel

Yu, Tao; Wei, Lin; Gao, Ling; Jin, Yang; Zhou, Yu; Yang, Jincai; Feng, Wei; Wang, Ying; Zhu, Jian Hua

doi:10.1016/j.jcis.2011.02.070

Cited by 17 publications

(4 citation statements)

References 34 publications

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“…The surface area diminution of the HT/SBA(C) can be attributed to the basic synthesis conditions. A basic medium can cause a partial destruction of the SBA-15 network [15]. Since the HT/SBA(NC) still presents the organic surfactant and TEOS during the coprecipitation of Mg and Al salts, the dissolution of the silanols species is not strongly affected by the basic pH, as SiO 2 is not formed.…”

Section: Resultsmentioning

confidence: 99%

Nanoporous composites prepared by a combination of SBA-15 with Mg–Al mixed oxides. Water vapor sorption properties

Pérez-Verdejo

Sampieri

Pfeiffer

et al. 2014

Beilstein J. Nanotechnol.

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SummaryThis work presents two easy ways for preparing nanostructured mesoporous composites by interconnecting and combining SBA-15 with mixed oxides derived from a calcined Mg–Al hydrotalcite. Two different Mg–Al hydrotalcite addition procedures were implemented, either after or during the SBA-15 synthesis (in situ method). The first procedure, i.e., the post-synthesis method, produces a composite material with Mg–Al mixed oxides homogeneously dispersed on the SBA-15 nanoporous surface. The resulting composites present textural properties similar to the SBA-15. On the other hand, with the second procedure (in situ method), Mg and Al mixed oxides occur on the porous composite, which displays a cauliflower morphology. This is an important microporosity contribution and micro and mesoporous surfaces coexist in almost the same proportion. Furthermore, the nanostructured mesoporous composites present an extraordinary water vapor sorption capacity. Such composites might be utilized as as acid-base catalysts, adsorbents, sensors or storage nanomaterials.

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Section: Resultsmentioning

confidence: 99%

Nanoporous composites prepared by a combination of SBA-15 with Mg–Al mixed oxides. Water vapor sorption properties

Pérez-Verdejo

Sampieri

Pfeiffer

et al. 2014

Beilstein J. Nanotechnol.

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“…12 Recently, layered double hydroxides (LDHs), a class of anionic clays, have attracted great interest due to their potential applications in catalysis, photochemistry, electrochemistry, polymerization, magnetization, biomedical science and in environmental processes. [21][22][23][24][25] LDHs, also known as hydrotalcite-like materials or anionic clays, are represented by the general formula [M 2+ 1−x M 3+…”

Section: Introductionmentioning

confidence: 99%

Effect of the synthesis pH, the nature of the divalent cations and the metal salt concentration on the formation of layered double hydroxides for removal of Cochineal Red A dye from aqueous solutions

Mendil

Nasrallah

2022

Journal of Chemical Research

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In this research work, removal of Cochineal Red A dye from aqueous solution was studied using layered double hydroxide materials prepared by a coprecipitation method at variable pH. The effects of the synthesis pH, the nature of the divalent cations and the total metal salt concentration on the formation of layered double hydroxides and their application to the removal of Cochineal Red A dye from aqueous solution were investigated. The structure of the materials prepared was characterized by X-ray diffraction and Fourier transform infrared. It was found that the nature and content of the bi- and trivalent metal ions in the layered double hydroxide influenced the adsorption. Ni–Fe had 0.96 to 1.70 times more adsorption capacity before reaching its equilibrium adsorption than Zn–Fe prepared at pH 7–9 with 2.2 M of total metal salt concentration. No difference was observed in the amount of Cochineal Red A dye adsorbed onto Zn–Fe prepared at both pH 7–9 and pH 10–11 in the range 1.1–3.3 M of total metal salt concentration. The results show that the increase in the precipitation pH leads to decreasing adsorption capacity. The Cochineal Red A dye adsorption follows the Temkin model for the Ni–Fe and Zn–Fe prepared at pH 7–9 and follows the Langmuir model for the Zn–Fe synthesized at pH 10–11 with high coefficient correlation. The adsorption kinetics data fitted the pseudo-second-order model. A thermodynamic study indicates that the adsorption process is both spontaneous and endothermic in nature.

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“…[1][2][3][4][5][6][7] However, the design and fabrication of these multifunctional nano-sized structures is always a challenging task due to the inherent difficulties involved in a controlled assembly of the individual nano-constituents. A commonly exploited synthesis strategy involves the generation of silica-based magnetic mesoporous supports prior to the addition of a third functional component.…”

Section: Introductionmentioning

confidence: 99%

“…The assembly of two or more different nanostructured materials with highly desirable properties, such as ordered silica mesoporous framework (loading space and a high surface area to host functional moieties), magnetic nanoparticles (NPs) (superparamagnetic behavior and magnetic separation/steering), and metal NPs (catalytic, bactericidal, or plasmonic properties) has been subjected to intense scientific and technological studies because of the wide range of potential applications of the resulting nanocomposites in the catalysis, environmental remediation, and biomedical fields. − However, the design and fabrication of these multifunctional nanosized structures is always a challenging task because of the inherent difficulties involved in a controlled assembly of the individual nanoconstituents. A commonly exploited synthesis strategy involves the generation of silica-based magnetic mesoporous supports prior to the addition of a third functional component.…”

Section: Introductionmentioning

confidence: 99%

Pumping Metallic Nanoparticles with Spatial Precision within Magnetic Mesoporous Platforms: 3D Characterization and Catalytic Application

Miguel-Sancho

Martı́nez

Sebastián

et al. 2017

ACS Appl. Mater. Interfaces

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┴ Araid Foundation. KEYWORDSRecyclable, magnetically recoverable self-assembled structures, mesoporous silica, waterdispersible nanoparticles, magnetic properties, peptide-like bonding and hydrogenation. ABSTRACTThe present work shows an efficient strategy to assemble two types of functional nanoparticles onto mesoporous MCM-41 silica nanospheres with high degree of spatial precision. In a first stage, magnetite nanoparticles are synthesized with a size larger than the support pores and grafted covalently through a peptide-like bonding onto its external surface. This endowed the silica nanoparticles with a strong superparamagnetic response, while preserving the highly ordered interior space for the encapsulation of other functional guest species. Secondly, we report the finely controlled pumping of preformed Pt nanoparticles (1.5 nm) within the channels of the magnetic MCM-41 nanospheres to confer an additional catalytic functionality to the multi-assembled nanoplatform. The penetration depth of the metallic nanoparticles can be explained as a result of the interplay between particle-wall electrostatic attraction and the repulsive forces between neighbouring Pt nanoparticles. A detailed transmission electron microscopy (TEM) and 3-D HighResolution HAADF electron Tomography study was carried out to characterize the material and to explain the assembly mechanism. Finally, the performance of these multifunctional nanohybrids as magnetically recoverable catalysts has been evaluated in the selective hydrogenation of pnitrophenol, a well-known pollutant and intermediate in multiple industrial processes.3

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Low-cost and effective phenol and basic dyes trapper derived from the porous silica coated with hydrotalcite gel

Cited by 17 publications

References 34 publications

Nanoporous composites prepared by a combination of SBA-15 with Mg–Al mixed oxides. Water vapor sorption properties

Nanoporous composites prepared by a combination of SBA-15 with Mg–Al mixed oxides. Water vapor sorption properties

Effect of the synthesis pH, the nature of the divalent cations and the metal salt concentration on the formation of layered double hydroxides for removal of Cochineal Red A dye from aqueous solutions

Pumping Metallic Nanoparticles with Spatial Precision within Magnetic Mesoporous Platforms: 3D Characterization and Catalytic Application

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