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National Repository of Grey Literature 2 records found  Search took 0.01 seconds. 
Photoactivity of water suspensions of titanium and tungsten oxides
 Mastný, L. ; Šaněk, F. ; Brožek, Vlastimil
Generator of water-stabilised plasma WSP® may be used for the thermal disposal of organic substances for which the dwell time of 5 ms maximum at 30,000 K is sufficient to ensure their destruction. Apart from high temperature, the device generates also highly intensive UV radiation and radiation with wavelengths of around 660 nm (Hα) and 490 nm (Hβ). Radiation in this part of spectra allows for the activation of not only photocatalysts based on TiO2 but also of other semi conductive oxides with narrower forbidden band, such as tungsten oxides. Their photoactivity was observed using a model decomposition of organic substances in water suspensions. A series of experiments were initiated on the disposal of industrial toxic and explosive waste debris, such as sodium picraminate.
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Interaction of the water stabilized plasma radiation with photocatalytic suspensions
 Mastný, L. ; Šaněk, F. ; Brožek, Vlastimil
The design of WSP® plasma torch with liquid used as stabilization agent, enables three different process zones for the decomposition of toxic chemicals. The first zone is inside the plasma stabilization chamber, where the liquid is in direkt contact with electric arc in the cathode zone. Second zone is at the exit notule in the outer space of the torch body. Here the nontransfered stream of the thermal plasma can act as heat source for thermal decomposition of chemical substances. The third zone was arranged in this work as a spiral from silica glass which acts as a tube flowed by the toxic liquid through and exposed to ultraviolet rays produced by the plasma. Inside such a tube the interaction of the water stabilized plasma radiation with photocatalytic suspensions was studied. As a model substances Orange II, nicotine and 2-nitroso-1-naphtol were used. The flow rate in frames 12 - 30 l/min was evaluated from the viewpoint of the effectivness of chemical decomposition.
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