Synthesis and Characterization of Amino‐functionalized Meso‐ porous Silicate MCM‐41 for Removal of Toxic Metal Ions

Sepehrian, Hamid; Waqif-Husain, Syed; Ghannadi‐Maragheh, Mohammad

doi:10.1002/cjoc.200990155

Cited by 8 publications

(6 citation statements)

References 21 publications

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“…A wide range of metal species are likely to be immobilized onto amine-modified mesoporous silica. 183 The binding process is however known to be strongly dependent on the particular affinity of amine groups for each metal ion, resulting thereby in distribution coefficients, K d values, following the affinity series and lowest residual concentrations in solution achievable in the case of formation of complexes with the best stability. 184 Also, due to possible protonation of amine groups and hydrolysis of metal ions (precipitation under metal hydroxides 180 ), pH usually played an important role in the effectiveness of the removal process.…”

Section: Heavy Metal Ionsmentioning

confidence: 99%

Mesoporous organosilica adsorbents: nanoengineered materials for removal of organic and inorganic pollutants

2010

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Section: Heavy Metal Ionsmentioning

confidence: 99%

Mesoporous organosilica adsorbents: nanoengineered materials for removal of organic and inorganic pollutants

2010

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Section: Resultsmentioning

confidence: 99%

“…Upon the amino-functionalization, this signal was shifted to higher 2θ values. This was attributed to the attachment of the organic functional groups onto the surface of NPs channels, which tends to reduce the scattering power (or scattering contrast) of the amorphous silicate wall [63][64][65]. Comparing A200S and nSiO2-APTES NPs (Figures 6 and 7), a shift of the back of the main halo is observed (22° for A200S and 21° for nSiO2-APTES).…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 97%

“…Upon the amino-functionalization, this signal was shifted to higher 2θ values. This was attributed to the attachment of the organic functional groups onto the surface of NPs channels, which tends to reduce the scattering power (or scattering contrast) of the amorphous silicate wall [63][64][65]. The relative oxygen content on the surface of A200S NPs decreased from 53.80 wt% to 32.69 wt% as compared with the A200 NPs (Table 1).…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 99%

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Morphological and Structural Properties of Amino-Functionalized Fumed Nanosilica and Its Comparison with Nanoparticles Obtained by Modified Stöber Method

et al. 2020

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In industry, silica nanoparticles (NPs) are obtained by the fuming and the precipitation method. Fumed silica NPs are commonly used in the preparation of nanocomposites because they have an extremely low bulk density (160–190 kg/m3), large surface area (50–600 m2/g), and nonporous surface, which promotes strong physical contact between the NPs and the organic phase. Fumed silica has fewer silanol groups (Si–OH) on its surface than the silica prepared by the Stöber method. However, the number of –OH groups on the fumed silica surface can be increased by pretreating them with sodium hydroxide (NaOH) before further surface modification. In this study, the effectiveness of the NaOH pretreatment was evaluated on commercial fumed silica NPs with a surface area of 200 m2/g. The number of surface –OH groups was estimated by potentiometric titration. The pretreated fumed NPs, and the precipitated NPs (prepared by the Stöber method) were modified with 3-aminopropyltriethoxysilane (APTES) to obtain A200S and nSiO2-APTES, respectively. The NPs were characterized using electron dispersive scanning (EDS), scanning electron microscopy (SEM), dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), BET (Brunauer–Emmett–Teller) analysis, and ζ-potential. XRD confirmed the presence of the organo-functional group on the surface of both NPs. After the amino-functionalization, the ζ-potential values of the nSiO2 and A200 changed from −35.5 mV and −14.4 mV to +26.2 mV and +11.76 mV, respectively. Consequently, we have successfully synthesized functionalized NPs with interesting, specific surface area and porosity (pore volume and size), which can be attractive materials for chemical and energy industries.

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“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15] Up to now, varieties of silsesquioxanes have been used as the precursors to prepare the mesoporous hybrid silicas. 16 The modification of the organic groups within the walls could broaden the application fields of these hybrid materials.…”

Section: Introductionmentioning

confidence: 99%

Structural Control of Mesoporous 1,4‐Phenylene‐silica Using the Mixture of CTAB/SDS

Zhuang

Zhang

et al. 2011

Chin. J. Chem.

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The morphology, pore architecture and crystallinity of the mesoporous 1,4-phenylene-silicas were controlled using the mixtures of cetyltrimethylammonium bromide (CTAB) and sodium dodecylsulfate (SDS). When the SDS/CTAB molar ratio increased from 0 to 1.0, the morphology of the mesoporous 1,4-phenylene-silicas changed in a sequence of sphere, hexagonal short rod, worm-like, bent flake and flower-like structure; the pore architecture of them changed from a hexagonal arranged tubular structure to a lamellar one; and the organization of the smallest repeat units within the wall changed from a random structure to a crystalline structure. At the SDS/CTAB molar ratios of 0.3 and 0.5, 1,4-phenylene-silica nanofibers with lamellar mesopores outside and tubular pore channels inside were obtained. The lamellar mesopores should be formed by merging the rod-like micelles during the reaction process.

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Synthesis and Characterization of Amino‐functionalized Meso‐ porous Silicate MCM‐41 for Removal of Toxic Metal Ions

Cited by 8 publications

References 21 publications

Mesoporous organosilica adsorbents: nanoengineered materials for removal of organic and inorganic pollutants

Mesoporous organosilica adsorbents: nanoengineered materials for removal of organic and inorganic pollutants

Morphological and Structural Properties of Amino-Functionalized Fumed Nanosilica and Its Comparison with Nanoparticles Obtained by Modified Stöber Method

Structural Control of Mesoporous 1,4‐Phenylene‐silica Using the Mixture of CTAB/SDS

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