Degradation of Rhodamine B by manganese residue activated peroxymonosulfate
Manganese residue was used to activate peroxymonosulfate(PMS)for Rhodamine B(RhB)degradation.The physichemical properties of manganese residue were analyzed by X-ray diffractometer,specific surface area and porosity analyzer and Fourier transform infrared spectrometer.The effects of manganese residue dosage,PMS concentration,temperature,pH,and RhB concentration of the solution on RhB degradation were studied.The reus-ability of manganese residue and mechanism of RhB degradation using PMS activated by manganese residue were also investigated.The results showed that manganese residue used in this study contained abundant Fe3O4,with a saturation magnetization of 8.67 emu/g and a specific surface area of 29.95 m2/g.The pores in manganese residue were predominantly mesoporous.The removal rate of RhB could reach 97.6%at 120 min under the conditions of temperature of 25℃,RhB concentration of 20 mg/L,manganese residue dosage of 2.0 g/L,PMS concentration of 0.50 mmol/L,pH of 4.9,and still could maintain 84.2%after 5 cycles.In the degradation process,1O2,O2·-and·OH were all involved in the reaction,with 1O2 playing a dominant role.
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