Preparation of Porous SnO2Particles Having High Specific Surface Area and High Thermal Stability via an Aqueous Solution Route and Subsequent Hydrothermal Treatment

2004 ◽  
Vol 33 (6) ◽  
pp. 738-739 ◽  
Author(s):  
Hirotoshi Ohgi ◽  
Takahiro Maeda ◽  
Shinobu Fujihara ◽  
Hiroaki Imai
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Hydrothermal Treatment ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Thermal Stability ◽  
Solution Route

scholarly journals Preparation and Characterization of CrOx/ZrO2 with High Thermal Stability and High Specific Surface Area

2004 ◽  
Vol 20 (03) ◽  
pp. 251-255
Author(s):  
Zeng Li ◽  
◽  
Wang Chun-Ming ◽  
Wei Ji-Ying ◽  
Zhu Yue-Xiang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
High Thermal Stability

The Effect of Hydrothermal Treatment on Samaria and Gadolinia Doped Ceria Powders Synthesized by Coprecipitation

2010 ◽  
Vol 660-661 ◽  
pp. 959-964
Author(s):  
Alexander Rodrigo Arakaki ◽  
Walter Kenji Yoshito ◽  
Valter Ussui ◽  
Dolores Ribeiro Ricci Lazar
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Hydrothermal Treatment ◽  
Specific Surface Area ◽  
Gas Adsorption ◽  
Fluorite Structure ◽  
High Specific Surface Area ◽  
Powder Synthesis ◽  
Laser Scattering ◽  
The One

One of the main applications of ceria-based (CeO2) ceramics is the manufacturing of Intermediate Temperature Solid Oxide Fuel Cells electrolytes. In order to improve ionic conductivity and densification of these materials various powder synthesis routes have been studied. In this work powders with composition Ce0.8(SmGd)0.2O1.9 have been synthesized by coprecipitation and hydrothermal treatment. A concentrate of rare earths containing 90wt% of CeO2 and other containing 51% of Sm2O3 and 30% of Gd2O3, both prepared from monazite processing, were used as precursor materials. The powders were characterized by X-ray diffraction, scanning and transmission electron microscopy, agglomerate size distribution by laser scattering and specific surface area by gas adsorption. Ceramic sinterability was evaluated by dilatometry and density measurements by Archimedes method. High specific surface area powders (~100m2/g) and cubic fluorite structure were obtained after hydrothermal treatment around 200°C. Ceramic densification was improved when compared to the one prepared from powders calcined at 800°C.

Advances of Graphene for Adsorption of Dyes in Wastewater

2013 ◽  
Vol 804 ◽  
pp. 89-93
Author(s):  
Jing Yi Yang ◽  
Yu Qiong Chen ◽  
Ying Chuan Ma ◽  
Xin Zhang ◽  
Ling Ling Luo ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Carbon Materials ◽  
High Specific Surface Area ◽  
High Thermal Stability ◽  
Charge Carriers ◽  
Functionalized Graphene ◽  
Covalently Bonded ◽  
Mobility Of Charge Carriers

Graphene is a fascinating new member of carbon materials with honeycomb and one-atom-thick structure, consisting of 2D hexagonal lattices of sp2 carbon atoms covalently bonded. Graphene has a huge theory specific surface area (over 2600 m2 g1), good thermal conductivity, high values of Youngs modulus and fracture strength, high thermal stability and chemical stability and fast mobility of charge carriers, etc.. In recent years, many researchers found graphene have outstanding adsorption capacity of dyes in aqueous solution due to its high specific surface area. This paper summarized the graphene, graphene oxide and functionalized graphene removing various dyes in wastewater.

scholarly journals Preparation of spherical aminopropyl-functionalized MCM-41 and its application in removal of Pb(II) ion from aqueous solution

2019 ◽  
Vol 8 (1) ◽  
pp. 275-284 ◽  
Author(s):  
Yi Lin ◽  
Jinjia Xu ◽  
Bhosale Sanjana Sudhakar ◽  
Junjie Gu ◽  
Ruoyu Hong
Keyword(s):  
Aqueous Solution ◽  
Mesoporous Silica ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Specific Surface Area ◽  
Synthesis Methods ◽  
Silica Microspheres ◽  
Mesoporous Silica Microspheres ◽  
Mcm 41

Abstract Mesoporous silica microspheres were prepared by the polymerization-induced colloid aggregation (PICA) and pseudomorphic synthesis methods. The prepared microspheres have high specific surface area and MCM-41 type structure. In the PICA process, acidic silica sol was utilized as silica source and the effect of molar ration (formaldehyde/urea) was investigated. Moreover, the influences of reaction time and temperature were also studied. The specific surface area of porous and mesoporous silica microspheres were 186.4 m2/g and 900.4 m2/g, respectively. The materials were characterized by SAXS, FTIR, SEM, TEM and nitrogen sorption measurements. The prepared silica microspheres were functionalized by (3-Aminopropyl)triethoxysilane and then used to remove the lead from aqueous solution. The result indicates that the grafted silica microspheres have rapid adsorption capacity and good reproducibility. The adsorption data was fitted well with the Langmuir isotherm model, and the maximum adsorption capacities for MCM-41 silica microspheres were 102.7 mg/g.

Removal of ciprofloxacin from aqueous solution using long TiO2 nanotubes with a high specific surface area

RSC Advances ◽  
2016 ◽  
Vol 6 (5) ◽  
pp. 3625-3631 ◽  
Author(s):  
Kai Zheng ◽  
Xingye Zheng ◽  
Fei Yu ◽  
Jie Ma
Keyword(s):  
Aqueous Solution ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Tio2 Nanotubes ◽  
High Specific Surface Area

Long TiO2 nanotubes (TNs) were successfully prepared by the reaction of TiO2 and NaOH.

PREPARATION AND CHARACTERIZATION OF TITANIA-PILLARED MONTMORILLONITE

2008 ◽  
Vol 15 (03) ◽  
pp. 329-336 ◽  
Author(s):  
YIMIN ZHANG ◽  
SHAOXIAN SONG ◽  
MIN ZHANG ◽  
BIYANG TUO
Keyword(s):  
Thermal Stability ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
High Thermal Stability ◽  
Basal Spacing ◽  
X Ray Diffraction ◽  
X Ray ◽  
Pillared Montmorillonite

In this work, a Ti -pillared montmorillonite with high thermal stability has been prepared by using a Na -montmorillonite as the host clay and polyhydroxy-titania ions as the pillaring precursor. The formation of Ti -pillared montmorillonite has been confirmed from the characterizations through X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric–differential scanning calorimeter, and specific surface area analyses. In the preparation of Ti -pillared montmorillonite several parameters, such as the type of solvent in which the synthesis is realized, the ratio of polyhydroxy-titania ions and montmorillonite, the intercalation time, the calcining temperature, and calcining time, were tested to understand their effects on the basal spacing. It was shown that this method could produce a Ti -pillared montmorillonite with the basal spacing of 3.74 nm, specific surface area of 409 m2/g, and mean pore size of 2.94 nm, as well as a high thermal stability up to 900°C.

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