Formation and Shrinkage of Necks in Microporous Silica Molecular Sieve with Ordered Mesoporous Structure

2012 ◽  
Vol 116 (5) ◽  
pp. 3702-3706 ◽  
Author(s):  
Kunimitsu Morishige ◽  
Yoshiyuki Kondou
Keyword(s):  
Molecular Sieve ◽  
Mesoporous Structure ◽  
Microporous Silica ◽  
Ordered Mesoporous

Synthesizing a surface-imprinted polymer based on the nanoreactor SBA-15 for optimizing the adsorption of salicylic acid from aqueous solution by response surface methodology

2021 ◽  
Vol 45 (14) ◽  
pp. 6192-6205
Author(s):  
Haiqing Xu ◽  
Yuhang Gao ◽  
Qiantu Tao ◽  
Aiping Li ◽  
Zhanchao Liu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Response Surface Methodology ◽  
Salicylic Acid ◽  
Response Surface ◽  
Molecularly Imprinted Polymer ◽  
Adsorption Property ◽  
Mesoporous Structure ◽  
Imprinted Polymer ◽  
Molecularly Imprinted ◽  
Ordered Mesoporous

The molecularly imprinted polymer prepared on the nanoreactor SBA-15 displayed excellent ordered mesoporous structure and superior adsorption property for salicylic acid.

scholarly journals Covalent Organic Framework-Functionalized Magnetic CuFe2O4/Ag Nanoparticles for the Reduction of 4-Nitrophenol

2020 ◽  
Author(s):  
Chen Hou ◽  
Dongyan Zhao ◽  
Wenqiang Chen ◽  
Hao Li ◽  
Sufeng Zhang ◽  
...  
Keyword(s):  
Ag Nanoparticles ◽  
Silver Ions ◽  
Mesoporous Structure ◽  
Order Rate Constant ◽  
High Specific Surface Area ◽  
Stacking Interactions ◽  
First Order ◽  
Pi Stacking ◽  
Ordered Mesoporous ◽  
Nano Catalysts

In this work, magnetic CuFe2O4/Ag nanoparticles activated by porous covalent organic frameworks (COF) was fabricated to evaluate the heterogenous reduction of 4-nitrophenol (4-NP). The core-shell CuFe2O4/Ag@COF was successfully prepared by polydopamine reduction of silver ions on CuFe2O4 nanoparticles, followed by COF layer condensation. With integrating the intrinsic characteristics of the magnetic CuFe2O4/Ag core and COF layer, the obtained nanocomposite exhibited features of high specific surface area (464.21 m2 g-1), ordered mesoporous structure, strong environment stability, as well as fast magnetic response. Accordingly, the CuFe2O4/Ag@COF catalyst showed good affinity towards 4-NP via π-π stacking interactions and possessed enhanced catalytic activity compared with CuFe2O4/Ag and CuFe2O4@COF. The pseudo-first-order rate constant of CuFe2O4/Ag@COF (0.77 min-1) is 3 and 5 times higher than CuFe2O4/Ag and CuFe2O4@COF, respectively. The characteristics of bi-catalytic CuFe2O4/Ag and the porous COF shell of CuFe2O4/Ag@COF made a contribution to improve the activity of 4-NP reduction. The present work demonstrated a facile strategy to fabricate COF activated nano-catalysts with enhanced performance in the fields of nitrophenolic wastewater treatment.

Effects of ordered mesoporous structure and La-doping on the microwave absorbing properties of CoFe2O4

2018 ◽  
Vol 434 ◽  
pp. 234-242 ◽  
Author(s):  
Tao Shang ◽  
Qingshan Lu ◽  
Luomeng Chao ◽  
Yanli Qin ◽  
Yuehou Yun ◽  
...  
Keyword(s):  
Mesoporous Structure ◽  
Microwave Absorbing Properties ◽  
La Doping ◽  
Ordered Mesoporous ◽  
Microwave Absorbing

Fabrication and Luminescent Properties of YVO4: Eu3+/MCM-41 Mesoporous Composites

2014 ◽  
Vol 707 ◽  
pp. 102-105
Author(s):  
Yi Jiang ◽  
Su Wen Li
Keyword(s):  
Hydrothermal Method ◽  
Luminescent Properties ◽  
Mesoporous Structure ◽  
Luminescence Properties ◽  
Ordered Mesoporous ◽  
Structure Morphology ◽  
Intrinsic Excitation ◽  
Mesoporous Composites ◽  
Mcm 41

The optical functionalized YVO4: Eu3+/MCM-41 mesoporous composites were prepared by hydrothermal method. The structure, morphology, luminescence properties and fluorescence dynamics were studied systemically. The compared studies of the luminescence properties of YVO4: Eu3+/MCM-41 with YVO4: Eu3+ nanocrystal were performed. The results show that the YVO4: Eu3+/MCM-41 retains high ordered mesoporous structure of MCM-41. In YVO4: Eu3+/MCM-41, the intrinsic excitation bands of Eu3+ disappears and the lifetimes of Eu3+ become short. The luminescent efficiency of YVO4: Eu3+/MCM-41 is higher than ones of the YVO4: Eu3+ nanocrystal.

Self-Assembly of Active Bi2O3/TiO2Visible Photocatalyst with Ordered Mesoporous Structure and Highly Crystallized Anatase

2008 ◽  
Vol 112 (16) ◽  
pp. 6258-6262 ◽  
Author(s):  
Zhenfeng Bian ◽  
Jian Zhu ◽  
Shaohua Wang ◽  
Yong Cao ◽  
Xufang Qian ◽  
...  
Keyword(s):  
Self Assembly ◽  
Mesoporous Structure ◽  
Ordered Mesoporous

Preparation and Characterization of Microporous Sol-Gel Derived Ceramic Membranes for GAS Separation Applications

1992 ◽  
Vol 271 ◽  
Author(s):  
R. S. A. De Lange ◽  
J. H. A. Hekkink ◽  
K. Keizer ◽  
A. J. Burggraaf
Keyword(s):  
Molecular Sieve ◽  
Gas Transport ◽  
Sol Gel ◽  
Ceramic Membranes ◽  
Mesoporous Alumina ◽  
Microporous Silica ◽  
Alumina Membranes ◽  
Separation Factors ◽  
Silica Sols

ABSTRACTMesoporous alumina membranes were modified with microporous silica. The polymeric silica sols consist of very weakly branched polymeric molecules with a fractal dimension of 1.3 and Guinier radius of ≈ 2.0 nm. The resulting top layer material is microporous with a porosity of 40% and a layer thickness of 60 nm. Gas transport is activated with an activation energy of 11 kJ/mol for hydrogen and molecular sieve like separation factors have been obtained. From the mechanism of gas transport the conclusion can be drawn that the pores are of molecular dimensions (0.7 – 1 nm diameter).

One-pot synthesis of superacid catalytic material SO42−/ZrO2–SiO2 with thermostable well-ordered mesoporous structure

2009 ◽  
Vol 182 (5) ◽  
pp. 991-994 ◽  
Author(s):  
Ruifeng Li ◽  
Feng Yu ◽  
Fuxiang Li ◽  
Meimei Zhou ◽  
Bingshe Xu ◽  
...  
Keyword(s):  
Mesoporous Structure ◽  
One Pot ◽  
One Pot Synthesis ◽  
Ordered Mesoporous ◽  
Catalytic Material

scholarly journals Enhancement in Graphitization of Ordered Mesoporous Carbon by Assistance of Soybean Oil Surfactant

2020 ◽  
Vol 36 (3) ◽  
Author(s):  
Le Thi Thu Hang ◽  
Hoang Thi Bich Thuy
Keyword(s):  
Soybean Oil ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Pore Volume ◽  
Mesoporous Carbon ◽  
Mesoporous Structure ◽  
Ordered Mesoporous Carbon ◽  
Graphitization Degree ◽  
Ordered Mesoporous

In this work, highly ordered mesoporous graphitic carbon (G-CMK3) has been prepared successfully by a nano-casting method using sucrose as carbon source, mesoporous silica as hard template, and soybean oil as surfactant. In the absence of soybean oil surfactant, the synthesized ordered mesoporous carbon material, CMK-3, revealed a low graphitization degree with a specific surface area of 1049.1 m2/g and a high pore volume of 1.172 cm3/g.  However, with the assistance of soybean oil surfactant, the graphitization degree was improved significantly, which was confirmed by the decrease in the ID/IG intensity ratio of the D (disordered or amorphous structure) and G (graphitic structure) peaks from 0.98 to 0.83. After the synthesis in the presence of soybean oil, G-CMK3 carbon maintained the integrity of the mesoporous structure albeit with a slight decrease in its specific surface area (845.2 m2/g) as well as pore volume (0.858 cm3/g).

Sign in / Sign up

Export Citation Format

Share Document