In this paper, sensitization TiO nanoparticles with sulphonated cobalt phthalocyanine(CoPcS-TNP) has been reported. The prepared samples characterized by different analysis such as: XRD, FT-IR, EDX, nitrogen physisorption, TG and TEM techniques. The XRD, TEM and nitrogen physisorption results showed the prepared samples containing only the pure anatase phase with crystal sizes in the range of 7-10 nm and high surface areas of 133-280 m 2 /g. The presence of CoPcS in photocatalysts confirmed by FT-IR and EDX analysis. The CoPcS-TNP samples showed efficient activity for photocatalytic degradation of 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) under visible light. The sample CoPcS-TNP (2.24) was the best photocatalyst for degradation of chlorophenols under visible light. The degradation reactions follow first-order kinetics. Reusing experiments of the photocatalyst showed a reduction activity from 95% to 60% for chlorophenols degradation after four cycles. The major intermediates of degradation were oxalic acid, pyruvic acid and malonic acid which identified by gas chromatography-mass spectrometry (GC/MS).
a b s t r ac tIn this research, preparation and photocatalytic performance of cobalt phthalocyanine tetrasulfonate sensitized TiO 2 nanoparticles (CoPcTs/TiO 2 ) for the degradation of thionine (TH) under visible light was reported. The prepared samples were characterized by X-ray diffraction, Fourier-transform infrared spectra, diffuse reflectance spectroscopy, nitrogen physisorption and transmission electron microscopy techniques. The obtained data revealed that the sensitized TiO 2 nanoparticles have pure anatase phase with crystal size of approximately 9.5 nm and surface area of 141 m 2 g -1.The experimental parameters such as catalyst dose, initial TH concentration and initial pH were studied. Maximum photodegradation of TH (more than 90%) was achieved within 120 min with the catalyst loading of 0.5 g L −1 and initial TH concentration of 10 mg L -1 , in the condition of neutral pH under visible light. Only 40% degradation of the TH was obtained in the presence of pure TiO 2 . The photocatalytic degradation reactions followed first-order kinetics and the experiential rate constants changed with TH concentrations.
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