Preparation of poly(3-hydroxybutyrateco-3-hydroxyvalerate) supported cobalt phthalocyanine thin membranes and its catalytic degradation of methylene blue

Abstract

The supported catalyst membranes (CoPc/PHBV) were prepared by solution casting method with tetracarboxyphthalocynine cobalt (CoPc) and poly(3-hydroxybutyrateco-3-hydroxyvalerate) (PHBV). The membranes were characterised by scanning electron microscope, X-ray diffractometer and fourier transform infrared spectroscopy. The results indicate that CoPc and PHBV may be combined by physical, and the crystal structure of PHBV which loaded CoPc is not changed. In addition, the catalytic performances of CoPc/PHBV were evaluated by degradation of methylene blue (MB). The results reveal that CoPc/PHBV and H2O2 have significant synergistic effect on catalytic degradation of MB, and degradation efficiency is 73% after 7 h. Hydroxyl radicals play a key role in catalytic degradation of MB based on the study of reaction mechanism. The dynamics about catalytic oxidation of MB were also explored. The results show that catalytic degradation process fits well with first-order kinetic equation.