scholarly journals Removal of Oil Pollution in water using hydrophobic silica

2021 ◽  
pp. 1-5
Author(s):  
Carmen Salazar-Hernández ◽  
Mercedes Salazar-Hernández ◽  
Lizeth Jocelyn Hernández-Arias ◽  
Juan Manuel Mendoza-Miranda
Keyword(s):  
Infrared Spectroscopy ◽  
World Wide ◽  
Oil Pollution ◽  
Tetraethyl Orthosilicate ◽  
Motor Oil ◽  
Wide Scope ◽  
Modified Silica ◽  
Solubility In Water ◽  
Stöber Method ◽  
The Stöber Method

Nowadays the contamination in waters by oily substances turns out to be a problem of world-wide scope and although some methods of removal of oils in water exist; these present some limitations; therefore, this project proposes the use of hydrophobic silicas as absorbent materials for oily substances. Modified silicas (R-SiO2) were synthesized using the Stöber method, modifying the surface by co-condensation. Tetraethyl-orthosilicate (TEOS) and two surface modifiers were used as silica former: Methyl-trimethoxysilane (MeTEOS) and n-octyl-triethoxysilane (nOctyl-TEOS). The R-SiO2 were characterized by infrared spectroscopy identifying the modifying groups and their hydrophobicity was qualitatively evaluated according to the change in solubility in water. Finally, the removability of an automotive motor oil was evaluated by determining the amount of oil removed per gram of modified silica.

Innentitelbild: Extension of The Stöber Method to the Preparation of Monodisperse Resorcinol-Formaldehyde Resin Polymer and Carbon Spheres (Angew. Chem. 26/2011)

2011 ◽  
Vol 123 (26) ◽  
pp. 5894-5894 ◽  
Author(s):  
Jian Liu ◽  
Shi Zhang Qiao ◽  
Hao Liu ◽  
Jun Chen ◽  
Ajay Orpe ◽  
...  
Keyword(s):  
Formaldehyde Resin ◽  
Carbon Spheres ◽  
Stöber Method ◽  
Resorcinol Formaldehyde ◽  
The Stöber Method

Study of Afterglow and Thermoluminescence Properties of Synthetic Opal-C Nanoparticles for In Vivo Dosimetry Applications

2013 ◽  
Vol 1530 ◽  
Author(s):  
Marlen Hernández-Ortiz ◽  
Laura S. Acosta-Torres ◽  
Rodolfo Bernal ◽  
Catalina Cruz-Vázquez ◽  
Víctor M. Castaño
Keyword(s):  
Radiation Dosimetry ◽  
Dose Range ◽  
Beta Particle ◽  
In Vivo Dosimetry ◽  
Synthetic Opal ◽  
Genotoxic Effects ◽  
Stöber Method ◽  
Particle Irradiation ◽  
The Stöber Method

ABSTRACTOpal particles, with diameter ca. 80 nm, were synthesized by the Stöber method. Samples were exposed to 100 Gy of beta particle irradiation and its thermoluminescence (TL) emission was recorded. TL response presents good reproducibility, standard deviation 1 %. The glow curve displays two TL peaks 86 and 400 °C and the afterglow (AG) phenomenon is observed immediately after irradiation (< 150°C). The synthetic opal-C exhibits a linear dependence of AG response as function of dose from 0.25 to 8 Gy. This dose range is of interest for personal and clinical dosimetry. Moreover, a previous study indicates that cytotoxic and genotoxic effects caused by opal nanoparticles, did not induce unrepairable DNA damage neither a cellular harm. Therefore, our results show synthetic opal-C is a material useful for in vivo radiation dosimetry.

scholarly journals The Past and Present Impact of Oil Pollution on Seabird Mortality World-wide.

1999 ◽  
Vol 31 (2) ◽  
pp. 108-133 ◽  
Author(s):  
Nariko Oka ◽  
Akinori Takahashi ◽  
Kohji Ishikawa ◽  
Yutaka Watanuki
Keyword(s):  
World Wide ◽  
Oil Pollution ◽  
The Past

A non-surfactant self-templating strategy for mesoporous silica nanospheres: beyond the Stöber method

Nanoscale ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 3657-3662 ◽  
Author(s):  
Zhe Chen ◽  
Bo Peng ◽  
Jia-Qiong Xu ◽  
Xue-Chen Xiang ◽  
Dong-Fang Ren ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Size Distribution ◽  
Mesoporous Silica Nanoparticles ◽  
Silica Nanospheres ◽  
Stöber Method ◽  
Directed Synthesis ◽  
The Stöber Method ◽  
Surfactant Templates ◽  
Mesoporous Silica Nanospheres

The “pre-Ouzo” structure directed synthesis of mesoporous silica nanoparticles (MSNs) in the absence of surfactant templates probably also explains the origin of highly monodisperse size distribution of classical Stöber silica NPs.

scholarly journals Effect of the Preparation Method on the Physicochemical Properties and the CO Oxidation Performance of Nanostructured CeO2/TiO2 Oxides

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 847 ◽  
Author(s):  
Sofia Stefa ◽  
Maria Lykaki ◽  
Dimitrios Fragkoulis ◽  
Vasileios Binas ◽  
Pavlos K. Pandis ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Co Oxidation ◽  
Rational Design ◽  
Mixed Oxides ◽  
Oxygen Storage ◽  
Precipitation Method ◽  
Stöber Method ◽  
X Ray ◽  
Oxidation Performance ◽  
The Stöber Method

Ceria-based mixed oxides have been widely studied in catalysis due to their unique surface and redox properties, with implications in numerous energy- and environmental-related applications. In this regard, the rational design of ceria-based composites by means of advanced synthetic routes has gained particular attention. In the present work, ceria–titania composites were synthesized by four different methods (precipitation, hydrothermal in one and two steps, Stöber) and their effect on the physicochemical characteristics and the CO oxidation performance was investigated. A thorough characterization study, including N2 adsorption-desorption, X-ray diffraction (XRD), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM/EDS), transmission electron microscopy (TEM) and H2 temperature-programmed reduction (H2-TPR) was performed. Ceria–titania samples prepared by the Stöber method, exhibited the optimum CO oxidation performance, followed by samples prepared by the hydrothermal method in one step, whereas the precipitation method led to almost inactive oxides. CeO2/TiO2 samples synthesized by the Stöber method display a rod-like morphology of ceria nanoparticles with a uniform distribution of TiO2, leading to enhanced reducibility and oxygen storage capacity (OSC). A linear relationship was disclosed among the catalytic performance of the samples prepared by different methods and the abundance of reducible oxygen species.

Reichenbachite from Cornwall and Portugal

1994 ◽  
Vol 58 (392) ◽  
pp. 449-454 ◽  
Author(s):  
R. S. W. Braithwaite ◽  
G. Ryback
Keyword(s):  
Infrared Spectroscopy ◽  
Rapid Method ◽  
World Wide ◽  
British Isles ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Time

AbstractInfrared spectroscopy is a rapid method of distinguishing between pseudomalachite and its polymorphs reichenbachite and ludjibaite. This technique, backed by X-ray diffraction has shown that a number of specimens labelled ‘pseudomalachite’ from Cornwall, in particular from Old Gunnislake mine, are of reichenbachite, thus identified for the first time from the British Isles. Reichenbachite has also been identified with pseudomalachite from Miguel Vacas mine, Vila Viçosa, Evora, Portugal. Identification of pseudomalachite from a number of other localities world-wide has been confirmed, and some specimens have been shown to be arsenatian.

Unraveling the Growth Mechanism of Silica Particles in the Stöber Method: In Situ Seeded Growth Model

Langmuir ◽  
2017 ◽  
Vol 33 (23) ◽  
pp. 5879-5890 ◽  
Author(s):  
Yandong Han ◽  
Ziyang Lu ◽  
Zhaogang Teng ◽  
Jinglun Liang ◽  
Zilong Guo ◽  
...  
Keyword(s):  
Growth Model ◽  
Growth Mechanism ◽  
Silica Particles ◽  
Seeded Growth ◽  
Stöber Method ◽  
The Stöber Method

Study of motor oil adulteration by infrared spectroscopy and chemometrics methods

Fuel ◽  
2013 ◽  
Vol 104 ◽  
pp. 798-804 ◽  
Author(s):  
M. Bassbasi ◽  
A. Hafid ◽  
S. Platikanov ◽  
R. Tauler ◽  
A. Oussama
Keyword(s):  
Infrared Spectroscopy ◽  
Motor Oil

Towards long-term colloidal stability of silica-based nanocarriers for hydrophobic molecules: beyond the Stöber method

2012 ◽  
Vol 48 (4) ◽  
pp. 591-593 ◽  
Author(s):  
Amauri J. Paula ◽  
Luciano A. Montoro ◽  
Antonio G. Souza Filho ◽  
Oswaldo L. Alves
Keyword(s):  
Colloidal Stability ◽  
Stöber Method ◽  
The Stöber Method
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