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Indexed by:期刊论文

Date of Publication:2018-03-01

Journal:DESALINATION AND WATER TREATMENT

Included Journals:SCIE

Volume:109

Page Number:145-151

ISSN No.:1944-3994

Key Words:Coking wastewater; Persulfate; NdFeB; Magnetic activated carbon

Abstract:Magnetic NdFeB loading on an activated carbon catalyst (FeOx-NdFeB@AC) was achieved by a negative pressure impregnation method in this study. The results of magnetic performance tests show that the FeOx-NdFeB@AC has hard magnetic properties. The surface morphology and composition test results indicated that the specific area and Fe content of FeOx-NdFeB@AC were significantly improved by the negative pressure impregnation treatment. The feasibility of the FeOx-NdFeB@AC as a catalyst in an activated persulfate process was studied by degrading real coking wastewater. The results showed that the FeOx-NdFeB@AC had splendid catalytic activity. Under optimum conditions (pH 3.0, temperature = 40 degrees C, concentration of FeOx-NdFeB@AC = 5.0 g/L, concentration of Na2S2O8 = 300 mg/L, reaction time = 60 min), The coking wastewater chemical oxygen demand (COD) and total organic carbon (TOC) degradation ratio could reach 80.1% and 82.0%, respectively. In addition, a kinetics study indicated that the TOC of the coking wastewater degradation process follows a pseudo-first-order kinetics model. This novel catalyst has the advantage of producing no sludge during wastewater treatment, and the catalyst can be separated from the aqueous phase by the magnetic method. This innovative magnetic catalyst has good application prospects in solving organic industrial wastewater pollution.