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Porous Nanomaterials
Science and technology
Zeolitic Framework Materials
Wednesday, 21 December 2011
Fabrication, modification and environmental applications of TiO2 nanotube arrays (TNTAs) and nanoparticles

This article is published online in:

 Front. Chem. Sci. Eng. ( Article in press)

DOI 10.1007/s11705-011-1144-6

by:

S. ROHANI , T. ISIMJAN, A. MOHAMED, H. KAZEMIAN, M. SALEM, T. WANG

Note: In this paper, moidification of TiO2 nano tube by means of ZIF-8  for photocatalytic applications is discussed  

Abstract:

Among the semiconductors, titanium dioxide has been identified as an effective photocatalyst due to its abundance, low cost, stability, and superior electronic energy band structure. Highly ordered nanotube arrays of titania were produced by anodization and mild sonication. The band gap energy of the titania nanotube arrays was reduced to 2.6 eV by co-doping with Fe, C, N atoms using an electrolyte solution containing K3Fe(CN)6. The photoconversion of phenol in a batch photoreactor increased to more than 18% based on the initial concentration of phenol by using a composite nanomaterial consisting of titania nanotube arrays and Pt/ZIF-8 nanoparticles. A layer-bylayer assembly technique for the deposition of titania nanoparticles was developed to fabricate air filters for the degradation of trace amounts of toluene in the air and preparation of superhyrophobic surfaces for oil-water separation and anti-corrosion surfaces.

 

 

 

 


Posted by hkazemian at 10:57 AM EST
Updated: Friday, 23 December 2011 4:12 PM EST
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Tuesday, 20 December 2011
A novel combined manufacturing technique for rapid production of IRMOF-1 using ultrasound and microwave energies

This Articl is published in:

Chemical Engineering Journal 165 (2010) 966–973

 by: Rana Sabouni, Hossein Kazemian, Sohrab Rohani

 

Abstract: 

 

The metal organic framework IRMOF-1 was successfully synthesized by applying a combination of ultrasonic (UTS) and microwave (MW) energy sources for rapid synthesis under various operating conditionsincluding: sonication time and temperature as well as microwave irradiation time. Moreover sample activation was employed to improve surface area of the synthesized IRMOF-1. While the highest Langmuir surface area of the as-synthesized samples was 1315m2/g sample, surface area of the activated sample was 2473m2/g. The reaction products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), solid-state Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and BET.

 

 

 Note: In this webloge I would like to share over two decade of my expereince in the area of zeolites sciences and technologies with you. please check the update posts. 

For further discussion, more information and references regarding any of the posts in the weblog, please contact me at : hosseinkazemian@gmail.com 


Posted by hkazemian at 12:15 PM EST
Updated: Friday, 23 December 2011 4:09 PM EST
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Photocatalytic activities of Pt/ZIF-8 loaded highly ordered TiO2 nanotubes
  This article is published in: J. Mater. Chem., 2010, 20, 10241–10245

 by: Tayirjan T. Isimjan, Hossein Kazemian, Sohrab Rohani* and Ajay K. Ray

 Abstract:

The structural and photocatalytic properties of Pt/ZIF-8 loaded TiO2 nanotubes (TiO2 NTs) are investigated and compared to Pt/TiO2 NTs. The loaded ZIF-8 nano crystallites were in the range of 20– 40 nm and adhered well to the inner and outer lateral surfaces of the nanotubes. A uniform coverage of he ZIF-8 on the surfaces of TiO2 NTs was observed by SEM. EDX results revealed 18.1% loading of ZIF-8 on the TiO2 NTs. An increase in photocatalytic properties of ZIF-8 loaded TiO2 NTs was bserved by photodegradation of phenol in a 15 mL batch reactor. The resulting Pt/ZIF-8 loaded TiO2 Ts composite were characterized by UV-vis, XRD and SEM.

 


Posted by hkazemian at 12:04 PM EST
Updated: Wednesday, 21 December 2011 11:07 AM EST
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In situ high pressure study of ZIF-8 by FTIR spectroscopy

This articl published in:

Chem. Commun., 2011, 47, 12694–12696

by:

Yue Hu,a Hossein Kazemian,b Sohrab Rohani,b Yining Huang*a and Yang Song*a

Abstract: 

 

ZIF-8 as a promising storage material was investigated at high pressures up to B39 GPa by in situ FTIR spectroscopy for the first time. Structural modifications are found to be reversible in a low-pressure region but irreversible in a high-pressure region. Overall, the ZIF-8 framework exhibits an unusual chemical stability even under extreme compression.

 

 

 


Posted by hkazemian at 12:01 PM EST
Updated: Friday, 23 December 2011 4:13 PM EST
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Monday, 19 December 2011
Zeolitic Frame work Matereials, MOFs, ZIFs
Topic: Science and technology
Porous metal–organic framework materials (MOFs) was introduced  for the first time by Yaghi and co-workers in the 1990s. In spite of the well known extraordinary properties of MOF materials that can apply for many various industrial applications particularly in the energy sector (e.g. for hydrogen and methane storage) as well as for environmental application ( e.g. CO2 separation and storage), one of the main obstacles of industrialization of this relatively new class of porous materials is their energy and time consuming production process, which means developing of techno-economically viable (i.e. relatively cheap and technologically feasible ) processes for production of MOF materials at larger  scale (cubic meters) is much desirable . Given the extraordinary affect of microwave and ultrasound energies, the main objective of this  blog is to discuss all aspects of the zeolitic materials including  novel and energy efficient manufacturing techniques using combinations of these relatively new energy sources along with conventional heating for manufacturing of some the down screened zeolitic-like framework materials at shorter crystallization time in an economically viable approach to produce cheaper materials at larger scale particularly for application in H2, CH4 and CO2 gases separation and storage, effective catalysts for NOx/SOx reduction and CO oxidation as well as appropriate carries for drug delivery .

Posted by hkazemian at 1:03 PM EST
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