LI Yan-cheng,LIU Yan-xi,LIU Ye-fang,et al.Degradation of Acid Red 3R by MnO2/CoFe2O4 Activated Permonosulfate[J].China Water & Wastewater,2021,37(17 17):78-85.
Degradation of Acid Red 3R by MnO2/CoFe2O4 Activated Permonosulfate
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第37卷
Number:
17 17
Page:
78-85
Column:
Date of publication:
2021-09-01
- Keywords:
- cobalt ferrite; manganese dioxide; permonosulfate; acid red 3R
- Abstract:
- In order to solve the problem of low catalytic efficiency caused by agglomeration of CoFe2O4, MnO2/CoFe2O4 (molar ratio was 5 ∶1) magnetic nanocomposite catalyst was prepared by two-step hydrothermal method. Then, the catalyst was characterized by XRD, XPS, SEM and BET, and degradation performance of acid red 3R (AR3R) by activated permonosulfate (PMS) and its degradation mechanism were investigated. Addition of MnO2 effectively solved the problem of CoFe2O4 agglomeration, and further improved the activation performance of MnO2 to PMS by using synergistic effect between ≡Mn3+ and ≡Co3+. When pH and dosages of PMS and MnO2/CoFe2O4 were 3, 1.25 mmol/L and 0.3 g/L, the degradation rate of AR3R (50 mg/L) reached 93.5% after 10 min of reaction. Free radical quenching experiment and XPS characterization of MnO2/CoFe2O4 before and after reaction indicated that both ≡Mn3+ and ≡Co2+ were involved in the electron transfer process, and SO4-· and ·OH produced by their synergistic activation of PMS dominated the degradation of AR3R. In addition, recycling experiment of the catalyst demonstrated that it could still maintain a catalytic degradation rate of more than 90% after 5 times of reuse, indicating that the catalyst has a good application prospect.
Last Update:
2021-09-01