研究目的

The aim of this work is, preparation of TiO2 nanoparticles containing different amounts of sulphonated cobalt phthalocyanine (CoPcS) by the hydrothermal method. The prepared samples were characterized by different analysis and used for the heterogeneous photocatalytic degradation of 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP) under visible light, which revealed enhanced photocatalytic activity as compared to the pure TiO2. The kinetic of chlorophenols degradation were investigated and the reaction intermediates during degradation were identified by GC-MS analysis.

研究成果

The study successfully synthesized TiO2 nanoparticles sensitized with CoPcS, demonstrating efficient photocatalytic degradation of chlorophenols under visible light. The CoPcS-TNP (2.24) sample showed the highest activity, with degradation following first-order kinetics. The main intermediates were identified as oxalic acid, pyruvic acid, and malonic acid. Despite a reduction in activity after reuse, the study highlights the potential of CoPcS-TNP as a photocatalyst for wastewater treatment.

研究不足

The study notes a reduction in photocatalytic activity from 95% to 60% after four cycles of reuse, attributed to the permanent adsorption of intermediate species or attack of OH radicals to the anchored phthalocyanine complex. The initial degradation rate of chlorophenols is faster at higher concentrations, but the rate constants decrease to some extent with increasing initial concentrations.