Water purification, semiconductor

Water purification. Semiconductor systems, such as particulate Ti02> have already demonstrated the possibility of oxidation of contaminants such as C, S02> and organics in aqeous solutions in the presence of oxygen. Irradiated semiconductors are very potent oxidizing agents, since hydroxyl radical is produced in some systems. Semiconductor dispersions should also be useful for disinfection and the oxidation of even very resistant organic molecules. 

Potential applications for CA-CDI technology include the purification of boiler water for fossil and nuclear power plants, volume reduction of liquid radioactive waste, treatment of agricultural wastewater containing pesticides and other toxic compounds, creation of ultrapure water for semiconductor processing, treatment of wastewater from electroplating operations, desalination of seawater, and removal of salt from water for agricultural irrigation. 

Mills A, Davies RH, Worsley D. Water purification by semiconductor photocatalysis. Chem Soc Rev 1993 417-25. 

Nitto Denko Corporation primarily manufactures industrial adhesive tapes for the electronics, automotive, health care, packaging and construction industries. The company produces industrial, electronic and functional products. Industrial products include double-coated adhesive tapes, masking tapes surface protective materials, sealing materials and label printing systems. Electronics products include LCD-related items general and advanced device resins printed circuit boards and semiconductor package adhesive sheets. Functional products include medical items such as transdermal therapeutic patches polymer separation membranes used for water purification and treatment and plastic engineering products such as information equipment and porous film materials used in cars, electronics, and home appliances. Nitto Denko America, Inc., an optoelectronics subsidiary, manufactures semiconductor... 

We present material and deviee eharaeterization of 280 nm semiconductor ultraviolet light emitting diodes. These devices exhibit low series resistance, wavelength stability with increasing current, and have a half-life in excess of 570hrs, depending upon the injection current. Time-resolved photoluminescence studies of these materials prior to fabrication have been correlated with the device performance. We also discuss the potential for use in water purification. 

A. Sobczyhski, A. Dobosz, Water purification by photocatalysis on semiconductors , Polish Journal of Environmental Studies, 10,195-205, (2001). 

In the purification of water via semiconductor photocatalysis, the electron acceptor, A, is invariably dissolved oxygen, and the electron donor, D, is the pollutant, which is usually organic. Under these circumstances, the overall process is the semiconductor... 

A. Mills, R.H. Davies and D. Worsley (1993) Chemical Society Reviews, vol. 22, p. 417 Water purification by semiconductor photocatalysis . 

We hope this book will be interesting and useful for scientists working in the area of semiconductor nanotechnology, photoelectrochemistry, photocatalysis, photochemistry of water and air purification, as well as for graduate and post-graduate students who are planning to join these research areas. 

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