Wavelength dependence of the efficiency of photocatalytic processes for water treatment

2018 ◽  
Vol 221 ◽  
pp. 258-265 ◽  
Author(s):  
Miguel Martín-Sómer ◽  
Beatriz Vega ◽  
Cristina Pablos ◽  
Rafael van Grieken ◽  
Javier Marugán
Keyword(s):  
Water Treatment ◽  
Wavelength Dependence ◽  
Photocatalytic Processes

Solar Photocatalytic Detoxification and Disinfection of Water: Recent Overview

2006 ◽  
Vol 129 (1) ◽  
pp. 4-15 ◽  
Author(s):  
Julián Blanco-Galvez ◽  
Pilar Fernández-Ibáñez ◽  
Sixto Malato-Rodríguez
Keyword(s):  
Water Treatment ◽  
Research And Development ◽  
Water Disinfection ◽  
Water Contaminants ◽  
Toxic Compounds ◽  
Solar Photocatalysis ◽  
Experimental Systems ◽  
Solar Reactors ◽  
Photocatalytic Processes

During the last few years, there has been a plethora of research and development in the area of solar photocatalysis (TiO2 and photo-Fenton). This overview, of the most recent papers on the use of sunlight to produce the O∙H, comments on those most relevant to the development of the technology and summarizes most of the recent research related to the degradation of water contaminants, and how solar photocatalysis (coupled with biotreatment) could significantly contribute to the treatment of very persistent toxic compounds. Various solar reactors for photocatalytic water treatment based mainly on nonconcentrating collectors developed during the last few years are also described in detail. This review also reports the use of the photocatalytic processes (TiO2) to inactivate microorganisms present in water, placing special emphasis on those applications that make use of sunlight. Work on water disinfection mechanisms in the last decade is summarized in the last part of this overview, with attention to some experimental systems developed to optimize this disinfection technology.

scholarly journals Photocatalysis: Oxidative Processes in Water Treatment

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Roman V. Prihod'ko ◽  
Nely M. Soboleva
Keyword(s):  
Water Treatment ◽  
Heterogeneous Systems ◽  
Promising Direction ◽  
Decomposition Processes ◽  
Oxidation Of Organic Compounds ◽  
Treatment Technologies ◽  
Oxidative Processes ◽  
Photocatalytic Processes ◽  
Complete Mineralization ◽  
Destructive Oxidation

The efficiency of various homogeneous and heterogeneous systems photocatalytic processes destructive oxidation of organic compounds of different classes is considered. It is shown that photocatalytic methods can significantly increase the speed and depth (up to complete mineralization) of decomposition processes of toxicants. The use of photocatalysis (PC) in the creation of low-power water treatment technologies is a promising direction in addressing environmental problems of the hydrosphere.

Polarimetric Observations of Red Variables: A Study of Gas and Particle Interactions

1979 ◽  
Vol 46 ◽  
pp. 386-408 ◽  
Author(s):  
G. V. Coyne ◽  
I. S. McLean
Keyword(s):  
Wavelength Dependence ◽  
Stellar Atmosphere ◽  
Molecular Absorption ◽  
Absorption Bands ◽  
Absorption And Emission ◽  
Mira Variables ◽  
Stellar Photosphere ◽  
Regular Variable ◽  
Red Supergiants ◽  
Balmer Lines

AbstractIn recent years the wavelength, dependence of the polarization in a number of Mira variables, semi-regular variables and red supergiants has been measured with resolutions between 0.3 and 300 A over the range 3300 to 11000 A. Variations are seen across molecular absorption bands, especially TiO bands, and across atomic absorption and emission lines, especially the Balmer lines. In most cases one can ignore or it is possible to eliminate the effects due to interstellar polarization, so that one can study the polarization mechanisms operating in the stellar atmosphere and environment. The stars Omicron Ceti. (Mira), V CVn (semi-regular variable) and Mu Cephei (M2 la), in addition to other stars similar to them, will be discussed in some detail.Models to explain the observed polarization consider that the continuum flux is polarized either by electron, molecular and/or grain scattering or by temperature variations and/or geometrical asymmetries over the stellar photosphere. This polarized radiation is affected by atomic and molecular absorption and emission processes at various geometric depths in the stellar atmosphere and envelope. High resolution spectropolarimetry promises, therefore, to be a power-rul tool for studying stratification effects in these stars.

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