标题：NATURAL GRAPE POLYPHENOLS FOR PREPARING SPHERICAL CO3O4 NANOAGGREGATES AS HETEROGENEOUS CATALYSTS FOR CATALYTIC OXIDATION OF ORANGE II WITH SULFATE RADICALS
摘要：Natural grape polyphenols has been used to induce chemical attraction towards cobalt ions (Co2+) and bring together square planar cobalt-grape polyphenol complexes due to its extensive polyphenolic ring system. By then, these complexes can be formed spherical Co3O4 nanoaggregates with direct decomposition at 500 °C in air. As prepared Co3O4 nanoaggregates with assist of grape polyphenol exhibited good catalytic effect for degradation of organic dyes. With the peroxymonosulfate (PMS) as oxidative activator and the dye Orange II as model organic dye, the Orange II in solution can be completely removed in the first 20 min, 25 min 35 min and 45 min at the initial Orange II concentration of 0.1 mM, 0.2 mM, 0.3 mM and 0.5 mM, respectively.
