Selective Adsorbents from Ordered Mesoporous Silica

Ho, Ka Yee; McKay, Gordon; Yeung, King Lun

doi:10.1021/la0267084

Cited by 337 publications

(235 citation statements)

References 36 publications

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“…The maximum adsorption capacities of MB onto Fe 3 O 4 /mSiO 2 -C 18 sorbent obtained from Langmuir equation at 25°C, 35°C and 45°C are 363.64 mg g À1 , 287.35 mg g À1 and 213.68 mg g À1 , respectively, with the adsorption equilibrium constants of 0.256 L mg À1 , 0.131 L mg À1 , and 0.127 L mg À1 . These values are superior to or comparable with those in most of the related works reported previously [10,22,30,[42][43][44][45][46] except for the porous magnetic carbon sheet [47] (Table S1). The Freundlich adsorption intensity parameters are higher than 1.5, also demonstrating the strong adsorption trend of MB onto the sorbent.…”

Section: Adsorption Isotherm Analysis and Thermodynamic Parameterssupporting

confidence: 65%

“…Both 22.62 emu g À1 due to the introduction of nonmagnetic mesoporous silica [40]. But it is still sufficient for the final sorbent to be isolated from aqueous solution magnetically.…”

Section: Characteristics Of Fe 3 O 4 /Msio 2 -C 18 Magnetic Compositementioning

confidence: 99%

“…Among them, mesoporous silica is the most widely-used one owing to the simple preparation, perfect chemical stability and biocompatibility [17,18]. Furthermore, the mesopore size can be easily controlled [19,20] and various functional groups can be modified onto the surface to obtain mesoporous silica with high adsorption selectivity toward different targets [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

One-pot synthesis of C18-functionalized core–shell magnetic mesoporous silica composite as efficient sorbent for organic dye

Zhang

Zeng

Wang

et al. 2015

Journal of Colloid and Interface Science

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a b s t r a c tIn this work, a facile one-pot strategy was proposed for the synthesis of C 18 -functionalized core-shell magnetic mesoporous silica composite (Fe 3 O 4 /mSiO 2 -C 18 ). The Fe 3 O 4 /mSiO 2 -C 18 composite, with an average size of 80 nm and a functionalized mesoporous silica shell of about 30 nm in thickness, has excellent adsorption ability toward methylene blue dye (MB) due to the large surface area (303 m 2 g À1 ) and the abundant hydrophobic C 18 groups. The adsorption equilibrium was achieved within 20 min and the adsorption behavior of MB on Fe 3 O 4 /mSiO 2 -C 18 composite fitted the pseudo-second-order kinetic model well (k 2 = 1.29 Â 10 À2 g mg À1 min À1 , q e = 144.72 mg g À1 , h o = 270.27 mg g À1 min À1 under 25°C and an initial MB concentration of 10 mg L À1 ). Langmuir and Freundlich isothermal adsorption models can both be used to describe the adsorption process and the maximum Langmuir adsorption capacity of MB on Fe 3 O 4 /mSiO 2 -C 18 at 25°C and pH 7.5 is 363.64 mg g À1 . Thermodynamic parameters show that the adsorption reaction is exothermic and spontaneous (DH 0 = À63.49 kJ mol À1 , DG 0 = À7.80 kJ mol À1 ). Ionic strength and pH affected the adsorption slightly. In addition, the MB adsorbed sorbent can be readily separated from water solution by an external magnet because of the high magnetic saturation value (22.62 emu g À1 ). After being regenerated by treatment with acidic methanol, the sorbent could be reused for at least 5 cycles with a little decrease in adsorption capacity.

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Section: Adsorption Isotherm Analysis and Thermodynamic Parameterssupporting

confidence: 65%

“…Both 22.62 emu g À1 due to the introduction of nonmagnetic mesoporous silica [40]. But it is still sufficient for the final sorbent to be isolated from aqueous solution magnetically.…”

Section: Characteristics Of Fe 3 O 4 /Msio 2 -C 18 Magnetic Compositementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

One-pot synthesis of C18-functionalized core–shell magnetic mesoporous silica composite as efficient sorbent for organic dye

Zhang

Zeng

Wang

et al. 2015

Journal of Colloid and Interface Science

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“…Thus, accessibility of contaminants to the reaction site should be improved using support material such as meso-macroporous silica. 15 The catalytic assays were performed onto iron oxide@meso-macroporous silica with hexagonally ordered mesopores that has the highest iron content This phenomenon is well documented in the literature 36 and it is driven by both electrostatic and hydrophobic interactions between the silica surface and the MB.…”

Section: Catalytic Performance Of Fe2o3@meso-macroporous Silicamentioning

confidence: 89%

Metallo-Solid Lipid Nanoparticles as Colloidal Tools for Meso–Macroporous Supported Catalysts

et al. 2015

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Meso-macroporous silica containing iron oxide nanoparticles (15-20 nm) was synthesized by formulating solid lipid nanoparticles and metallosurfactant as both template and metal source. Due to the high active surface area of the catalyst, the material exhibits an excellent performance in a Fenton-like reaction for methylene blue (MB) degradation, even at low amount of iron oxide (5% TOC after 14h).2

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“…Functionalization of the solid supports can be realized by functional silane coupling reagents. The polysiloxane sorbents functionalized with mercapto and amine groups are revealed in the literature as effective in the removal of metal ions [20][21][22][23][24][25][26] and Hg(II) [27,28]. In addition, bifunctional sorbents containing two functionalities (amine and mercapto) on the same sorbent had been prepared and used for the removal of metal ions [29].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and application of a novel mercapto- and amine-bifunctionalized silica for speciation/sorption of inorganic arsenic prior to inductively coupled plasma mass spectrometric determination

Boyacı

Çağır

Shahwan

et al. 2011

Talanta

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a b s t r a c tA bifunctional sorbent, (NH 2 + SH)silica, containing both amine and mercapto functionalities was prepared by modification of silica gel with 3-(triethoxysilyl)propylamine and (3-mercaptopropyl)trimethoxysilane. In addition to the bifunctional sorbent, silica gel was modified individually with the functional mercapto-and amino-silanes, and the mono-functional sorbents, namely (SH)silica and (NH 2 )silica, were also mechanically mixed ((NH 2 )silica + (SH)silica) for the sake of comparison of sorption performances. It has been demonstrated that (SH)silica shows quantitative sorption only to As(III) at two pH values, 1.0 and 9.0, while (NH 2 )silica displays selectivity only towards As(V) at pH 3.0. On the other hand, the bifunctional (NH 2 + SH)silica possesses the efficient features of the two mono-functionalized sorbents; for example, it retains As(III) at a wider pH range, from 1.0 to at least 9.0 with the exception at pH 2.0, and it also shows quantitative sorption to As(V) at pH 3.0. This property gives the bifunctional (NH 2 + SH)silica a better flexibility in terms of sorption performance as a function of solution pH. The mechanically mixed (NH 2 )silica + (SH)silica exhibits a similar but less efficient sorption behavior compared to the bifunctional sorbent. Desorption of both As(III) and As(V) species can be realized using 0.5 M NaOH. The validity of the proposed method was checked through the analysis of a standard reference material and a good correlation was obtained between the certified (26.67 g L −1 ) and determined (27.53 ± 0.37 g L −1 ) values. Spike recovery tests realized with ultrapure water (93.0 ± 2.3%) and drinking water (86.9 ± 1.2%) also confirmed the applicability of the method.

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Selective Adsorbents from Ordered Mesoporous Silica

Cited by 337 publications

References 36 publications

One-pot synthesis of C18-functionalized core–shell magnetic mesoporous silica composite as efficient sorbent for organic dye

One-pot synthesis of C18-functionalized core–shell magnetic mesoporous silica composite as efficient sorbent for organic dye

Metallo-Solid Lipid Nanoparticles as Colloidal Tools for Meso–Macroporous Supported Catalysts

Synthesis, characterization and application of a novel mercapto- and amine-bifunctionalized silica for speciation/sorption of inorganic arsenic prior to inductively coupled plasma mass spectrometric determination

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