On the extended recrystallisation of mesoporous silica: characterisation of restructured pure silica MCM-41

2002 ◽  
Vol 12 (10) ◽  
pp. 3027-3033 ◽  
Author(s):  
Robert Mokaya
Keyword(s):  
Mesoporous Silica ◽  
Pure Silica ◽  
Mcm 41

scholarly journals SYNTHESIS OF FUNCTIONALIZED MCM-41 MESOPOROUS SILICA

2017 ◽  
Vol 5 ◽  
pp. 1164-1168
Author(s):  
Nevin Karamahmut Mermer ◽  
Muge Sari Yilmaz
Keyword(s):  
Mesoporous Silica ◽  
Gas Sensing ◽  
Textural Properties ◽  
Mesoporous Molecular Sieve ◽  
Crystalline Materials ◽  
X Ray ◽  
Pure Silica ◽  
Significant Interest ◽  
Derivative Thermogravimetry ◽  
Mcm 41

: The invention of mesoporous materials is of significant interest to many scientists worldwide. The Mobil Crystalline Materials No 41 (MCM-41) is a well-known mesoporous molecular sieve that was discovered in 1992 by a scientist at the Mobil Oil Corporation. The MCM-41 is widely used in catalysis, ion exchange, drug delivery, optics, gas sensing, and sorption. In this study, the surface of a mesoporous silica MCM-41, synthesized from pure silica, is functionalized with a methyl group by grafting. The synthesized and functionalized samples are characterized by X-ray powder diffractometer (XRD), and the functionalized sample are also characterized by Fourier transform infrared spectroscopy (FTIR). The textural properties of the samples are determined using N2 adsorption and desorption analysis. Thermal behaviors of the samples are analyzed using thermogravimetry (TG) and derivative thermogravimetry (DTG). The results of the analyses show that the functionalization of the synthesized material through grafting was accomplished with the surface area of the functionalized sample determined as 600.87 m2 g-1.

scholarly journals Recycle of gold mine tailings slurry into MCM-41 mesoporous silica with high specific surface area

2017 ◽  
Vol 23 (4) ◽  
pp. 581-588 ◽  
Author(s):  
Degitz Acaroglu ◽  
Yilmaz Sari ◽  
Sabriye Piskin
Keyword(s):  
Mesoporous Silica ◽  
Surface Area ◽  
Structural Properties ◽  
Mine Tailings ◽  
Synthesis Process ◽  
Gold Mine ◽  
Pure Silica ◽  
Silica Source ◽  
Gold Mine Tailings ◽  
Mcm 41

In this study, MCM-41 was prepared from the gold mine tailings slurry as an alternative silica source. The effects of the reaction time, temperature, and pH adjustments on the synthesis of MCM-41 were investigated. The optimum condition for the synthesis process of pure and highly ordered MCM-41 from tailings slurry was found to be at 30?C for 60 min with a pH of 11. In addition, MCM-41 was synthesized from a pure silica source, in order to compare the structural properties of the obtained sample from that of the slurry produced at optimum conditions. The samples synthesized from tailings slurry had a high surface area of 983 m2/g and a pore volume of 0.74 cm3/g. The structural properties of the samples produced from the slurry were closely related with those that were synthesized from a pure silica source. Results indicate that the tailings slurry has the potential to be used as a cheap, alternative silica source which can be used for the synthesis of a pure and ordered mesoporous silica MCM-41.

Preparation and characterization of highly pure silica from sedge as agricultural waste and its utilization in the synthesis of mesoporous silica MCM-41

2013 ◽  
Vol 44 (5) ◽  
pp. 821-828 ◽  
Author(s):  
Farshid Ghorbani ◽  
Habibollah Younesi ◽  
Zahra Mehraban ◽  
Mehmet Sabri Çelik ◽  
Ali Asghar Ghoreyshi ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Agricultural Waste ◽  
Pure Silica ◽  
Mcm 41

scholarly journals Fabrication of the magnetic mesoporous silica Fe-MCM-41-A as efficient adsorbent: performance, kinetics and mechanism

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yige Guo ◽  
Bin Chen ◽  
Ying Zhao ◽  
Tianxue Yang
Keyword(s):  
Mesoporous Silica ◽  
Zero Valent Iron ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Environment And Health ◽  
Transmission Electron ◽  
Order Kinetic Model ◽  
Neutral Conditions ◽  
Magnetic Mesoporous Silica ◽  
Mcm 41

AbstractAntibiotics are emerging pollutants and increasingly present in aquaculture and industrial wastewater. Due to their impact on the environment and health, their removal has recently become a significant concern. In this investigation, we synthesized nano zero-valent iron-loaded magnetic mesoporous silica (Fe-MCM-41-A) via precipitation and applied the adsorption of oxytetracycline (OTC) from an aqueous solution. The effects of competing ions such as Na+, Ca2+ and Cu2+ on the adsorption process under different pH conditions were studied in depth to providing a theoretical basis for the application of nanomaterials. The characterization of the obtained material through transmission electron microscopy demonstrates that the adsorbent possesses hexagonal channels, which facilitate mass transfer during adsorption. The loaded zero-valent iron made the magnetic, and was thus separated under an applied magnetic field. The adsorption of OTC onto Fe-MCM-41-A is rapid and obeys the pseudo-second-order kinetic model, and the maximum adsorption capacity of OTC is 625.90 mg g−1. The reaction between OTC and Fe-MCM-41-A was inner complexation and was less affected by the Na+. The effect of Ca2+ on the adsorption was small under acidic and neutral conditions. However, the promotion effect of Ca2+ increased by the increase of pH. Cu2+ decreased the removal efficiencies continuously and the inhibitory effects decrease varied with the increase of pH. We propose that surface complexing, ion-exchange, cationic π-bonding, hydrogen bonding, and hydrophobicity are responsible for the adsorption of OTC onto Fe-MCM-41-A.

Amine-modified MCM-41 mesoporous silica for carbon dioxide capture

2011 ◽  
Vol 143 (1) ◽  
pp. 174-179 ◽  
Author(s):  
Marília R. Mello ◽  
Delphine Phanon ◽  
Gleiciani Q. Silveira ◽  
Philip L. Llewellyn ◽  
Célia M. Ronconi
Keyword(s):  
Carbon Dioxide ◽  
Mesoporous Silica ◽  
Carbon Dioxide Capture ◽  
Mcm 41

Novel menthol releaser derived from as-synthesized mesoporous silica

RSC Advances ◽  
2015 ◽  
Vol 5 (8) ◽  
pp. 5494-5500 ◽  
Author(s):  
Xin Yu Ming Dong ◽  
Yan Yan Li ◽  
Feng Wei ◽  
Yu Zhou ◽  
Shi Lu Zhou ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Mcm 41

Menthol could be adsorbed in as-synthesized MCM-41 at 373 K, open stored in ambient for 30 days and released at 333 K.

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