Effect of Silicon Sources on Self-Assembly in Acidic Environment and Impact on Morphology and Grain Size of Mesoporous Material

2007 ◽  
Vol 121-123 ◽  
pp. 465-468
Author(s):  
Song Chen ◽  
Yong Run Yang ◽  
Jin Dai Wang
Keyword(s):  
Mesoporous Materials ◽  
Self Assembly ◽  
Mesoporous Material ◽  
Hydrothermal Process ◽  
Material Synthesis ◽  
Acid Media ◽  
Silicon Source ◽  
Nanometer Material ◽  
Silicon Sources ◽  
Mcm 41

Alkaline hydrothermal process with using cetyl-trimenthylammonium bromide as template is typical method to prepare MCM-41 mesoporous material. Synthesis in acid media was seldom researched deeply. With cheap inorganic water glass, effect of different silicon sources on self-assembly in acid media was investigated. Not like typical MCM-41 mesoporous materials, it is found that results of analysis are a little different and morphology of mesoporous materials synthesized in acid media does not rely on silicon sources, regardless of organic or inorganic silicon source. It is also noticed that nanometer granule of mesoporous material can be directly made by simply adjusting water dosage, which open up a new way for preparing nanometer material by self-assembly.

A Novel Iron Silicate Mesoporous Material Synthesis and Its Characterization

2018 ◽  
Vol 24 (8) ◽  
pp. 5532-5536
Author(s):  
M. A Mary Thangam ◽  
Chellapandian Kannan
Keyword(s):  
Mesoporous Materials ◽  
Molecular Sieves ◽  
Mesoporous Material ◽  
Synthesis Method ◽  
Acid Sites ◽  
Mesoporous Molecular Sieves ◽  
Isomorphous Substitution ◽  
Main Role ◽  
Material Synthesis ◽  
Ft Ir

The mesoporous materials have variety of applications in several field particularly it has a main role in Catalysis, Petrochemical industries and Adsorption. Normally the porous material has well ordered 3Dimensional structure, huge surface area, high thermal stability and active acid sites. The properties of these materials can be varied because it is mostly depends on its template, synthesis method and isomorphous substitution of metal ions. There are two major mesoporous materials which are aluminosilicate and aluminophosphate. In this present investigation AlCl3 and FeCl3 are used in equal amount for the synthesis of mesoporous material. The synthesized material is characterized by FT-IR, XRD, TGA, BET, EDAX and TPD. Morphological images were studied by SEM. These characterization techniques confirm the formation of mesoporous molecular sieves.

A TIME DEPENDENT STUDY FOR THE FORMATION OF ULTRASMALL Cs-AlMCM-41 HOLLOW NANOSPHERES

2021 ◽  
Vol 5 (1) ◽  
pp. 347-357
Author(s):  
Abdullahi Haruna ◽  
Sani Sadiq ◽  
Kabo S. Kamaluddeen
Keyword(s):  
Mesoporous Materials ◽  
Self Assembly ◽  
Negative Charge ◽  
Raw Materials ◽  
Hydrothermal Condition ◽  
Time Dependent ◽  
Hollow Nanospheres ◽  
Inorganic Species ◽  
Spherical Micelles ◽  
Mcm 41

Monitoring of the formation of ultrasmall Cs-AlMCM-41 nanospheres under hydrothermal condition has been performed. It showed that when the CTABr surfactant, silica and alumina were mixed, homogenization of raw materials was first taking place, where CTABr molecules first interacted with the inorganic species via self-assembly into helical rod-like micelles. Hydrolysis, condensation and polymerization of silica and alumina precursors were then initiated. In addition, the Cs+ cation also participated during the formation of MCM-41 structure where it counterbalanced the negative charge of the aluminosilicate surface. After 14 h, the aluminosilicate oligomers were produced and fully enclosed the spherical micelles. Further increasing the hydrothermal treatment to 24 h onwards, polycondensation silanol siloxane would take place leading to the emergence of well-defined and highly ordered MCM-41 structure. This study came up with a clear picture on the formation of Cs-AlMCM-41 hollow nanospheres in cationic-surfactant-templated. This suggested that similar studies for other mesoporous materials such as MCM-48 and MCM-50 under different conditions and approaches could also be explored

scholarly journals A STUDY ON SYNTHESIS OF MCM-41 MESOPOROUS MATERIAL WITH SOURCE OF SODIUM SILICATE SOLUTION FROM RICE HUSK ASH

2017 ◽  
Vol 126 (1C) ◽  
pp. 37
Author(s):  
Hoàng Văn Đức
Keyword(s):  
Sodium Silicate ◽  
Rice Husk ◽  
Mesoporous Material ◽  
Rice Husk Ash ◽  
Hydrothermal Process ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Molar Ratio ◽  
Ctab Concentration ◽  
Mcm 41

<p>In the present paper, a synthesis of MCM-41 mesoporous material with the sodium silicate solution prepared from the rice husk ash as a silica source by the hydrothermal process was demonstrated. The influence of synthesized conditions such as CTAB concentration, SiO<sub>2</sub>/CTAB molar ratio, stirring time and hydrothermal time were investigated. The samples were characterized by XRD, FT–IR and N<sub>2</sub> adsorption–desorption measurement. The obtained results showed that the samples possessed highly ordered hexagonal mesostructure with uniform mesopore size distribution in a large range of CTAB concentration (1,98-4,81% mass) and the SiO<sub>2</sub>/CTAB molar ratio (4-15). The sample had a high surface area (1071 m<sup>2</sup>/g) and large pore diameter (33,5 Å) with the molar ratio of CTAB: SiO<sub>2</sub>: H<sub>2</sub>O = 1: 6: 1000.</p><p>Keywords: MCM-41, sodium silicate solution, rice husk ash</p>

Synthesis of Ti-MCM-41 mesoporous materials using iron ore tailing as silicon source

2015 ◽  
Vol 19 (sup1) ◽  
pp. S1-203-S1-206
Author(s):  
Z. X. Lin ◽  
Y. X. Deng ◽  
G. Yang ◽  
Y. Wang
Keyword(s):  
Mesoporous Materials ◽  
Iron Ore ◽  
Silicon Source ◽  
Iron Ore Tailing ◽  
Mcm 41

Size Control of Block Polymer Templated Mesoporous Silicate Materials

2000 ◽  
Vol 628 ◽  
Author(s):  
Takeo Yamada ◽  
Keisuke Asai ◽  
Kenkichi Ishigure ◽  
Akira Endo ◽  
Hao S. Zhou ◽  
...  
Keyword(s):  
Mesoporous Materials ◽  
Molecular Sieve ◽  
Mesoporous Material ◽  
Triblock Copolymer ◽  
Size Control ◽  
Block Polymer ◽  
New Class ◽  
Mesoporous Silicate ◽  
Cubic Structure ◽  
Silicate Materials

ABSTRACTMesoporous materials have attracted considerable interest because of applications in molecular sieve, catalyst, and adsorbent. It will be useful for new functional device if functional molecules can be incorporated into the pore of mesoporous material. However, it is necessary to synthesize new mesoporous materials with controlled large pore size. Recently, new class of mesoporous materials has been prepared using triblock copolymer as a template. In this paper, we reported that hexagonal and cubic structure silicate mesoporous materials can be synthesized through triblock copolymer templating, and their size was controlled by synthesis condition at condensation.

Selective oxidation of cyclopentene to glutaraldehyde by H2O2 over Nb-SBA-15

2021 ◽  
Author(s):  
yingmeng qi ◽  
Qi Han ◽  
li wu ◽  
Jun Li
Keyword(s):  
Structural Properties ◽  
Selective Oxidation ◽  
Mesoporous Materials ◽  
Hydrothermal Process ◽  
X Ray Diffraction ◽  
X Ray

A series of niobium-containing mesoporous materials Nb-SBA-15 have been prepared by sonication–impregnation and hydrothermal process. The dispersion and structural properties of niobium-containing species were systematically characterized by X-ray diffraction, scanning...

scholarly journals Optimization of MCM-41 Mesoporous Material Mixed Matrix Polyethersulfone Membrane for Dye Removal

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 414
Author(s):  
Rana J. Kadhim ◽  
Faris H. Al-Ani ◽  
Qusay F. Alsalhy ◽  
Alberto Figoli
Keyword(s):  
Membrane Fouling ◽  
Mesoporous Material ◽  
Optimization Technique ◽  
Operating Conditions ◽  
Mixed Matrix ◽  
Pareto Chart ◽  
Significance Level ◽  
Pes Membrane ◽  
Wasted Energy ◽  
Mcm 41

The aim of this work is the optimization of the operating conditions under which MCM-41-mesoporous material can be incorporated into polyethersulfone (PES)/MCM-41 membranes for nanofiltration (NF) applications. MCM-41 mesoporous material mixed matrix PES membranes have the potential to reduce membrane fouling by organic dye molecules. Process optimization and modeling aim to reduce wasted energy while maintaining high flow during the operation to handle the energy efficiency problems membranes often have. An optimization technique was applied to obtain optimum values for some key parameters in the process to produce a certain amount of flux above the desired values. Response surface methodology (RSM) and analysis of variance (ANOVA) were used as mathematical and statistical analyses to improve the performance of the process on a larger scale. This work investigated the influence of the operating parameters, such as the feed pH values (3–11), MCM-41 content (0–1 wt.%), and the feed dye concentration (10–100 ppm) for each of the two studied dyes, acid black 210 (AB-210) and rose bengal (RB), and their interactions on the PES membrane permeability. The results showed that the PES membrane had the best performance at 64.25 (L·m−2·h−1·bar-1) and 63.16 (L·m−2·h−1·bar-1) for the AB-210 and RB dyes, respectively. An MCM-41 content of nearly 0.8 wt.% in the casting solution, feed dye concentration of 10 ppm for the studied dyes, and feed pH of 3 for the RB dye was found to be the optimal parameters for eliciting the response. The pH had no significant influence on the response for the AB-210 dye, while the pH shows some minor effects on response with the RB dye, and the Pareto chart of the standardized effects on the permeation flux of both dyes using statistically significant at the 5% significance level support these results.

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