科研之友
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摘要
Novel amorphous Fe3O4/FePO4/ZrO2 ceramic coatings as solid acid with porous structure were successfully synthesized in the phosphate electrolyte containing K2ZrF6 via plasma electrolytic oxidation (PEO) technique and characterized by scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The surface acidic property was investigated by NH3-TPD method. The results showed that the pore size and the intensity of pore interconnection of amorphous Fe3O4/FePO4/ZrO2 ceramic coating with solid acid property, increased with the increase of the K2ZrF6 dosage from 0.5 g to 2.0 g in the phosphate electrolyte. The Fenton-like performance of PEO coating catalysts was investigated by degradation of phenol under circumneutral pH. It was found that phenol removal efficiency decreased with the adding of K2ZrF6 amount from 0.5 g to 2.0 g except no catalytic activity of coating prepared without K2ZrF6, and Fenton-like PEO coating catalyst prepared with 0.5 g K2ZrF6 exhibited a superior catalytic activity which could degrade phenol thoroughly within 2 min under circumneutral pH. The strong acid sites played a dominant role in enhancing the Fenton-like catalytic activity. The excellent catalytic activity of PEO coating prepared in the phosphate electrolyte containing K2ZrF6 endowed it potential application in wastewater treatment.
