Facile synthesis of hierarchical MCM-41 spheres with an ultrahigh surface area and their application for removal of methylene blue from aqueous solutions

2014 ◽  
Vol 6 (5) ◽  
pp. 1397-1403 ◽  
Author(s):  
Qishu Qu ◽  
Zuli Gu
Keyword(s):  
Methylene Blue ◽  
Mesoporous Silica ◽  
Aqueous Solutions ◽  
Surface Area ◽  
Sol Gel ◽  
Silica Spheres ◽  
Facile Synthesis ◽  
Gel Method ◽  
Mesoporous Silica Spheres ◽  
Mcm 41

Hierarchical mesoporous silica spheres were prepared by a simple sol–gel method and used for the removal of methylene blue from aqueous solutions.

scholarly journals Enhanced Adsorption of Methylene Blue and Congo Red from Aqueous Solutions by MCM-41/HKUST-1 Composites

2019 ◽  
Vol 31 (8) ◽  
pp. 1675-1682 ◽  
Author(s):  
D.O. Sulistiono ◽  
E. Santoso ◽  
R. Ediati
Keyword(s):  
Methylene Blue ◽  
Mesoporous Silica ◽  
Aqueous Solutions ◽  
Congo Red ◽  
Metal Organic Framework ◽  
Solvent Mixture ◽  
Sem Images ◽  
Enhanced Adsorption ◽  
Xrd Patterns ◽  
Mcm 41

Impregnation of mesoporous silica MCM-41 on metal organic framework type HKUST-1 or often called CuBTC (BTC = 1,3,5-benzenetricarboxylate) has been successfully carried out by solvothermal methods in a solvent mixture of water, ethanol and N,N-dimethylformamide (DMF). The XRD patterns of the obtained solids showed that MCM-41/HKUST-1 composites had the same crystalline phase as pure as HKUST-1. SEM images revealed that the impregnation of the mesoporous silica to HKUST-1 did not alter the surface morphology of the original HKUST-1, which had octahedral shapes. In addition, the thermal stability of the MCM-41/HKUST-1 composites reached 302 °C, increased by 292 °C in comparison to the HKUST-1, even though the impregnation process resulted in a decreased in the specific surface area of the composites. Furthermore, MCM-41/HKUST-1 composites showed outstanding performance as adsorbent of methylene blue and Congo red in aqueous solutions. Results of adsorption studies showed that a pseudo-second order kinetics and Langmuir isotherm were observed for both types of dyes.

Organically-modified mesoporous silica spheres with MCM-41 architecture

2002 ◽  
Vol 26 (4) ◽  
pp. 384-386 ◽  
Author(s):  
Mathieu Etienne ◽  
Benédicte Lebeau ◽  
Alain Walcarius
Keyword(s):  
Mesoporous Silica ◽  
Silica Spheres ◽  
Organically Modified ◽  
Mesoporous Silica Spheres ◽  
Mcm 41

Enhancement of Photocatalytic Activity of TiO2 Thin Film Using Diethanolamine and MCM-41

2012 ◽  
Vol 712 ◽  
pp. 117-131 ◽  
Author(s):  
Ananta Kumar Karki ◽  
Nurak Grisdanurak ◽  
Siriluk Chiarakorn
Keyword(s):  
Thin Film ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
Anatase Phase ◽  
Sol Gel ◽  
Dip Coating ◽  
Bet Surface Area ◽  
Mcm 41

TiO2thin film enhanced by diethanolamine (DEA) and MCM-41 (D-TiO2/MCM-41) was successfully synthesized by sol-gel dip coating technique on glass slides. The roles of DEA and MCM-41 on physical and photocatalytic characteristics of the films were studied using various techniques such as x-ray defraction (XRD), fourier transform infrared spectroscopy (FTIR), ultra violet-visible (UV-Vis) spectrometry, Brunauer, Emmett and Teller (BET) surface area analysis and field emission scanning electron microscope (FESEM). The XRD results showed that the thin film contained almost 100% anatase phase and the crystal size of TiO2was in the range of 4-8 nm. The FTIR spectra indicated the formation of Ti-O-Si and Si-O-Si linkages due to interaction of TiO2and MCM-41. The surface area of TiO2was increased significantly when MCM-41 was added. The use DEA and MCM-41 caused slight increase in visible light absorption but UV absorption was decreased. The photocatalytic reactivity of the thin film was tested by photocatalytic degradation of methylene blue under visible light. The addition of DEA as a nitrogen source was beneficial not only for obtaining stable/smooth surface of the thin film but also for enhancing photocatalysis of methylene blue by preventing charge carrier recombination. While MCM-41 played important functions in improving porosity and hydrophilicity of the film. The photodegradation of methylene blue was obtained up to 35% of its original concentration when 1M DEA and 0.3M MCM-41 were incorporated in TiO2thin film. The overall enhancement of photocatalytic activity of the film was a result of nitrogen doping, increased surface area as well as increased hydrophilicity provided by MCM-41.

Preparation and Characterization of CdTe/SiO2 Composite

2011 ◽  
Vol 233-235 ◽  
pp. 1946-1949
Author(s):  
Mei Ping Wang ◽  
Jin Hui Lin ◽  
Xiao Li Hao
Keyword(s):  
Aqueous Solutions ◽  
Sol Gel ◽  
Silica Spheres ◽  
Gel Method ◽  
The Core ◽  
Cdte Nanocrystals ◽  
Luminescence Peak ◽  
Sodium Tellurite ◽  
Phosphate Buffered Saline

TGA- stabilized CdTe nanocrystals (NCs) were prepared using sodium tellurite as tellurium source, which avoids the cumbersome processes associated with H2Te or NaHTe sources. Fluorescent CdTe/SiO2composites were prepared by a sol–gel method without the exchange of surface ligands. The composites were characterized with TEM and fluorescence spectrophotometer and investigated their stability in phosphate-buffered saline (PBS) buffer. CdTe NCs were loaded into the core of silica spheres during the formation of composite spheres. In contrast to CdTe NCs in aqueous solutions, CdTe NCs in the composite revealed better stability and the luminescence peak show red-shift.

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