Iron tetra-carboxyl phthalocyanine (TCFePc) was covalently immobilized to the surface of core-shell magnetite silica nanoparticles (NPs) as facilely separated supported catalyst, namely P-M SiO<sub>2</sub> NPs, for catalyzing the degradation of organic pollutants in aqueous solution under visible light irradiation. X-ray diffraction, transmission electron microscopy (TEM), scanning electron microscopy (SEM), superconducting quantum interference device (SQUID), and ultraviolet–visible (UV-Vis) spectroscopy were used to characterize the sample. The photocatalytic activity of P-M SiO<sub>2</sub> NPs was determined using rhodamine B (RhB) and methyl orange (MO) as the objective decomposition substances. The results revealed that the novel supported catalyst exhibited good catalytic activity over a wide pH range, and the degradation rate of RhB and MO is up to 90% during 120 min of reaction. Moreover, it is noteworthy that the catalyst can be easily separated using an external magnetic field and employed directly for the next round of reaction.
Xiaolan Chen, Jianli Zou, Lihua Liu, Yong Zhang, and Jiao Huang, "Preparation of Magnetic Silica Nanoparticle-Supported Iron Tetra-Carboxyl Phthalocyanine Catalyst and Its Photocatalytic Properties," Appl. Spectrosc. 64, 552-557 (2010)