Study on process for degradation of rhodamine B dye by Ag/TiO2 catalyst under visible irradiation
Corressponding author's email:
nhuvtt@hcmute.edu.vnKeywords:
TiO2, silver nanoparticles, photocatalyst, Rhodamine B, degradationAbstract
TiO2 (P25) doped with silver nanoparticles (Ag/TiO2) synthesized by g-irradiation method was used for the photocatalytic degradation of Rhodamine B (RB) dye. The effects of operational parameters such as catalysts amount, initial dye concentration, pH were studied for the photocatalytic degradation of Rhodamine B by Ag/TiO2 catalyst. Catalytic testing of RB showed that Ag nano/TiO2 photocatalyst exhibited better photocatalytic activity compared to that of TiO2 under the same reaction condition and TiO2 doped with 1.5 % (w/w) Ag gave high photodegradation efficiency (95.59%) of 10-5M Rhodamine B at pH 6 using 2 g/L catalyst within 2 hours. The possible intermediate products during the photocatalytic degradation has been suggested, which was based on the electrospray ionization mass spectrometry (ESI-MS) analysis. The complete mineralization of RB dye (10-5M) was confirmed by high performance liquid chromatography (HPLC) analysis. Results demonstrated that the Ag/TiO2 catalyst can effectively degrade RB dye with optimum conditions.
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