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

Yuan, Peng; Yang, Diya; Lin, Ziyu; He, Hongping; Wen, Xiaoyan; Wang, Linjiang; Deng, Feng

doi:10.1016/j.jnoncrysol.2006.05.035

Cited by 67 publications

(43 citation statements)

References 38 publications

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“…Two raw diatomite samples were obtained from Qingshanyuan diatomite Co., Ltd. (Jilin provinces, China) and Shanwang diatomite Co., Ltd. (Shandong provinces, China), respectively, and purified by sedimentation method [19]; the purified samples were denoted Dt(JL) and Dt(SD), respectively. The dominant diatoms of Dt(JL) and Dt(SD) are the genus Coscinodiscus Ehrenberg (Centrales) and Synedra Ehrenberg (Pennales), respectively.…”

Section: Diatomite Samplesmentioning

confidence: 99%

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Liu¹,

Yuan²,

Tan³

et al. 2012

Journal of Colloid and Interface Science

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Section: Diatomite Samplesmentioning

confidence: 99%

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Liu¹,

Yuan²,

Tan³

et al. 2012

Journal of Colloid and Interface Science

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“…The main mineral component is the frustules, the silicified hard shells of diatoms. These shells are composed of amorphous silica which is responsible for the high porosity, strong adsorbability, good thermal resistance, and chemical inertness of diatomite [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

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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“…New reflections at 28.1, 31.1, and 35.7°(d spacings of 0.317, 0.287, and 0.252 nm, respectively) appeared after heating at this temperature and are attributed to enstatite. In addition, amorphous SiO 2 , which is characterized by the broad diffraction at approximately 22°(2h) [9], appeared in Pal-900. However, the reflections due to quartz exhibited few changes, indicating that heat treatments up to 900°C exert few effects on the crystalline structure of quartz.…”

mentioning

confidence: 99%

FTIR spectroscopy study of the structure changes of palygorskite under heating

Yan

Liu

Tan

et al. 2012

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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

Cited by 67 publications

References 38 publications

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

Facile preparation of hierarchically porous carbon using diatomite as both template and catalyst and methylene blue adsorption of carbon products

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

FTIR spectroscopy study of the structure changes of palygorskite under heating

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