Some Observations on the Development of Superior Photocatalytic Systems for Application to Water Purification by the “Adsorb and Shuttle” or the Interphase Charge Transfer Mechanisms

Molecules

Cooper Langford¹  Maryam Izadifard³  Emad Radwan²  Gopal Achari⁴ 

[1] Department of Chemistry, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada;Department of Water Pollution Research, National Research Centre, Cairo 12311, Egypt; E-Mail:;Department of Chemistry University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada; E-Mail:Department of Civil Engineering, University of Calgary, 2500 University Dr. NW, Calgary, AB T2N 1N4, Canada; E-Mail;

关键词: TiO₂;    photocatalysis;    adsorb and shuttle;    charge transfer;    electron storage;    carbon;    zeolite;    WO₃;   

DOI  :  10.3390/molecules191219557

来源: mdpi

【 摘 要 】

Adsorb and shuttle (A/S) and interfacial charge transfer are the two major strategies for overcoming recombination in photocatalysis in this era of nanoparticle composites. Their relationships are considered here. A review of key literature is accompanied by a presentation of three new experiments within the overall aim of assessing the relation of these strategies. The cases presented include: A/S by a high silica zeolite/TiO₂ composite, charge transfer (CT) between phases in a TiO₂/WO₃ composite and both A/S and CT by composites of TiO₂ with powered activated carbon (AC) and single-walled carbon nanotubes (SWCNT). The opportunities presented by the two strategies for moving toward photocatalysts that could support applications for the removal of contaminants from drinking water or that lead to a practical adsorbent for organics that could be regenerated photocatalytically link this discussion to ongoing research here.

【 授权许可】

CC BY   
© 2014 by the authors; licensee MDPI, Basel, Switzerland.