Adsorption Characteristics of Organosilica Based Mesoporous Materials

Matsumoto, Akihiko; Misran, Halina; Tsutsumi, Keisuke

doi:10.1021/la0360409

Cited by 58 publications

(32 citation statements)

References 29 publications

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“…For hexagonal PMO 9, we observed a considerable decrease of the intensities of the (100), (110), and (200) reflections after 24 h (9a), however, which regained intensity after 72 (9b) and 144 h (9c) (SI, Figure S10). 61,63 Nitrogen physisorption analyses were performed on all of the hydrothermally treated PMOs, revealing the preservation of the type-IV isotherms including distinct features such as hysteresis loops (SI, Figures S9 and S10). Detailed physicochemical parameters of the PMOs after hydrothermal treatment are listed in Table S1 (SI).…”

Section: ; Simentioning

confidence: 99%

Facile Mesophase Control of Periodic Mesoporous Organosilicas under Basic Conditions

et al. 2008

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The mesophase structure of ordered periodic mesoporous organosilicas (PMOs) can be easily adjusted under basic conditions by variation of the sodium hydroxide concentration. PMOs with hexagonal (p6mm, two-dimensional pore system), cubic (Pm3n or Fm3m, three-dimensional cagelike pore system), and disordered hexagonal (MSU-type) symmetry were obtained from 1,2-bis(triethoxysilyl)ethane (BTEE)-derived synthesis gels in the presence of binary surfactant mixtures, [CH 3 (CH 2 ) 15 NMe 3 ] + Br -(C 16 TABr) and [CH 3 (CH 2 ) n NMe 2 (CH 2 ) 3 NMe 3 ] 2+ 2Br -(n ) 15, 17), as structure-directing agents. With an increasing amount of NaOH, mesophase-mesophase transitions from p6mm f Pm3n f Fm3m f distorted cubic f MSU-type (3D-network of "wormholelike" mesopores) were evidenced by powder X-ray diffraction analysis and transmission electron microscopy. Slight variations of the NaOH concentration not only affected the PMO mesophase structure via the charge matching principle but also the PMO morphology. Among others, hexagons with smooth faces, regular decaoctahedrons, and spherical particles were found from scanning electron microscopy. The PMO mesophase was further found to be dependent on the carbon chain length of the surfactant. 13 C and 29 Si magic-angle-spinning NMR spectroscopy revealed that intact ethylene moieties were incorporated uniformly into the framework. According to N 2 physisorption measurements, the PMOs display Brunauer-Emmett-Teller surface areas as high as 870 m 2 /g and cage diameters in the [55,63] Å size range. Finally, the hydrothermal stability of three representative PMOs with cubic Pm3n, cubic Fm3m, and hexagonal p6mm symmetry was investigated in detail.

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Section: ; Simentioning

confidence: 99%

Facile Mesophase Control of Periodic Mesoporous Organosilicas under Basic Conditions

et al. 2008

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“…In a typical synthesis procedure, the sample was obtained by the hydrolysis and co-condensation of TEOS at room temperature based on the method reported elsewhere by Schumacher et al [27] and Matsumoto et al [28]. The as-synthesized material was calcined at 823 K for more than 6 h to burn out the template to obtain surfactant-free sample, hereafter is known as MCM-41.…”

Section: Preparation Of Mcm-41 From Pure Silica Sourcementioning

confidence: 99%

Processing of mesoporous silica materials (MCM-41) from coal fly ash

Misran

Ramesh

Begum

et al. 2007

Journal of Materials Processing Technology

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“…8 The large pores are benecial for the adsorption of bulky molecules compared to AC materials with dominant micropores. 17,18 Therefore, increasing the hydrophobicity of mesoporous materials is required in order to improve their VOC adsorption performance. However, the amount of VOCs adsorbed on silica-based mesoporous materials could be signicantly reduced in the presence of water vapor because of the strong interaction between water molecules and silanols.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of hollow organosiliceous spheres for volatile organic compound removal

et al. 2014

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Hollow organosiliceous sphere (HOS) materials have been successfully synthesized by a co-condensation method with tetraethylorthosilicate (TEOS) and organosilane (1,2-bis(triethoxysilyl)ethane, BTSE) as mixed silica sources under acidic conditions. The application of HOSs as adsorbents for the volatile organic compound (VOC) abatement was demonstrated. The HOSs were characterized by transmission electron microscopy (TEM), N 2 sorption isotherms, FT-IR spectroscopy, thermogravimetric analysis (TGA) and Xray photoelectron spectroscopy (XPS). The results indicated that all samples showed a uniform hollow mesostructure and the organic groups were chemically incorporated into the walls of HOSs. The static adsorption and stability behaviors of water vapor, n-hexane and 93# gasoline on HOSs were investigated, with commercial silica gel (SG) and activated carbon (AC) as references. It was found that the sample with an initial molar ratio BTSE/(BTSE + TEOS) of 25% (HOS-25%) had the largest VOC adsorption capacity (1.36 g g À1 n-hexane and 1.35 g g À1 93# gasoline) and the smallest water vapor adsorption capacity (0.0120 g g À1 ) under static adsorption conditions. The dynamic adsorption behaviors of n-hexane on HOS-25% were evaluated via breakthrough curves. The dynamic adsorption capacities of n-hexane are in the following order: SG < AC < HOS-25% and the stability is in the order of AC < SG < HOS-25%. The larger dynamic VOC capacity of the HOSs may be attributed to the synergetic effect between the unique morphology and hybrid walls. The static and dynamic n-hexane and water vapor competitive adsorption results suggested that HOS-25% had a much higher adsorption tendency for VOCs over water vapor. The HOSs with high hydrophobicity, large VOC removal capacity and excellent recyclability show great potential for VOC controlling.

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Adsorption Characteristics of Organosilica Based Mesoporous Materials

Cited by 58 publications

References 29 publications

Facile Mesophase Control of Periodic Mesoporous Organosilicas under Basic Conditions

Facile Mesophase Control of Periodic Mesoporous Organosilicas under Basic Conditions

Processing of mesoporous silica materials (MCM-41) from coal fly ash

Synthesis of hollow organosiliceous spheres for volatile organic compound removal

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