A study of surface modification of silica using XPS, DRIFT and NMR

Garbassi, F.; Balducci, Luigi; Chiurlo, P.; Deiana, Luca

doi:10.1016/0169-4332(94)00469-2

Cited by 51 publications

(32 citation statements)

References 23 publications

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“…7.0 ppm) is still exhibited in the spectrum of PD-1100-T, suggesting that the H-bonded silanols is poorly reactive for the silylation. The activity of isolated silanols and the poor activity of H-bonded ones for silylation by TMCS were also found in the cases of some synthetic silica (e.g., MCM-41 [35,36] and Grace SD 3216.20 [16]). The existence of capping water is unfavorable for the silylation, since they cover on silanols to prevent them from reacting with TMCS.…”

Section: H Mas Nmr and Ftir Analysismentioning

confidence: 89%

“…6 are the FTIR spectra of silylated diatom-silica samples. The peaks at 2852 ± 1, 2920 ± 1, 2963 ± 1 cm À1 are attributed to the vibration modes of the grafted TMCS [16,35,37]. The intensities of these bands increase with the increment of pretreatment temperature, and get the maximum at 1100°C.…”

Section: H Mas Nmr and Ftir Analysismentioning

confidence: 91%

“…Many studies have been developed to investigate the properties of silanols on the surface of some synthetic silicas by various characterization methods, including chemical reaction [5,6], adsorption [7], and spectroscopic method (IR [8,9], NMR [4,[10][11][12][13], etc.). Much attention was also paid to the surface modification of synthetic silica [14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane

Yuan

Yang

Lin

et al. 2006

Journal of Non-Crystalline Solids

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Section: H Mas Nmr and Ftir Analysismentioning

confidence: 89%

Section: H Mas Nmr and Ftir Analysismentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane

Yuan

Yang

Lin

et al. 2006

Journal of Non-Crystalline Solids

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“…4. The signals presented at 2963, 2920, and 2851 cm -1 are related to the vibrational modes of the TMCS grafted to the surface [2,46,58,59]. In the case of PD-400-M (Fig.…”

Section: Hp 129 Xe Nmrmentioning

confidence: 98%

“…Other works focused on surface modification [20,[45][46][47][48]. Nonetheless, there are very few reports about the effect of thermal pretreatment on the surface modification of diatomite [2,34].…”

Section: Introductionmentioning

confidence: 96%

Effect of pretreatment temperature on the surface modification of diatomite with trimethylchlorosilane

et al. 2016

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Diatomite samples from Costa Rica were purified using acidic treatments with hydrochloric acid, thermally treated (400-1000°C) and then silylated with trimethylchlorosilane in toluene under inert atmosphere. The purification process allows to decrease the concentration of metals presented in the crude diatomite, as is confirmed by X-ray Fluorescence (XRF) Analysis. The silylated materials were analyzed by using Hyperpolarized 129 Xe Nuclear Magnetic Resonance Spectroscopy (HP 129 Xe NMR), Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Thermogravimetric Analysis (TGA), rehydration tests, and contact angle measurements. XRD measurements indicate that diatomite is mainly amorphous, but presents several crystalline phases (kaolinite, cristobalite, and quartz). Pretreatments at high temperatures cause changes in those crystalline phases, resulting in more amorphous materials. However, there is no difference in the overall structure of purified and thermally treated diatomite samples with respect to the silylation products. In addition, SEM measurements show no effect over the pore structure of the materials. On the other hand, TGA measurements and rehydration tests show lower losses of water for silylated materials prepared using higher pretreatment temperatures. Moreover, HP 129 Xe NMR, FTIR, and contact angle measurements evidence a modification due to covalent attachment of Si(CH 3 ) 3 -groups to the surface, which increases for higher pretreatment temperatures. The results provide valuable information about external factors that influence the surface modification of diatomite. This can be useful to control modifications that can be achieved in a similar way.

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Synthesis of macroporous polymer foams via pickering high internal phase emulsions for highly efficient 2,4,5‐trichlorophenol removal

Pan

Yin

et al. 2014

J of Applied Polymer Sci

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Macroporous polymers foams (MPFs) were prepared by W/O Pickering high internal phase emulsions (HIPEs) stabilized by oleic acid (OA) modified silica nanoparticles (SPs), and then as-prepared MPFs were applied to highly efficient adsorption of 2,4,5-trichlorophenol (TCP). The characterization demonstrated that MPFs possessed macropore (50-150 lm) and interconnected pores (0.5-2 lm), and also had slightly hydrophobic nature (contact angle was 116 ) and excellent thermal stability especially bellow 200 C. The influence of pH value, temperature, initial concentration, and contact time for the batch mode adsorption process was investigated, and the results showed that the maximum adsorption capacity and equilibrium time at 25 C were 167.7 mg g 21 and 30 min, respectively. Moreover, the experimental data indicate that equilibrium isotherms for TCP fitted to the non-linear Langmuir model, and both the adsorption and desorption kinetics can be represented by the pseudo-second-order model. The possible adsorption mechanism was considered to be the dispersion and hydrophobic interaction, simultaneously. The regeneration of the MPFs for one cycle was 94%. The results above strongly proved that this method reached the effect of highly efficient TCP removal.

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A study of surface modification of silica using XPS, DRIFT and NMR

Cited by 51 publications

References 23 publications

Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane

Influences of pretreatment temperature on the surface silylation of diatomaceous amorphous silica with trimethylchlorosilane

Effect of pretreatment temperature on the surface modification of diatomite with trimethylchlorosilane

Synthesis of macroporous polymer foams via pickering high internal phase emulsions for highly efficient 2,4,5‐trichlorophenol removal

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