Application of a nan o sized TD -TiO۲ in a sono assisted phot o-catalytic process

It has been reveal ed that, some of the dra wbacks of in dividual techniques can be eliminated by some characteristics of other techniques [۱]. In the present study application of a sono-assisted photo -catalytic de gradation of an azo dy e, Direct Red ۱۶ (DR۱ ۶), in aqueous solutio n was performed. The used photo -catalyst i s nano tita nia particl es synthesized via thermal decom position me thod (TD-TiO۲) [۲].Mate rial and methods:The azo dye, direct red ۱۶, C۲۶H۱۷N۵Na۲O۸S۲ (C.I. ۲ ۷۶۸۰, MW ۶۳۷.۲۶) was purchased from Alvan Sabet comp any (Iran), ۹۹% pure. S ulfuric acid and sodium hydroxide used to adjust the pH of solutions a nd were all Merck pr oducts. Titanium tetraisopropoxide ((CH۳)۲CHO)۴Ti was u sed as precursor of titania and supplied by Aldrich (purity >۹۷%).In each run, a certain amount of the nano TD-TiO۲ powders was mixed with ۱.۰ L of the dye soluti on. The pH of the solu tions was a djusted to the desired value and transferred to the reactor, and after adjusting t emperature and well mixing usin g air bubbl es and ultra sonic waves, the lamp was switche d on to initiate the process (sono-assisted/UV/T iO۲). Samples (۵ mL) were taken at regular time intervals and ce ntrifuged (i n two step) to separate the nanoparticles from the solutions for furthe r analysis.

کلیدواژه ها:

Nano TD-TiO۲ ، W astewater treatment ، DR۱۶ ، Thermal decompo sition.