期刊
SEPARATION AND PURIFICATION TECHNOLOGY
卷 250, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.seppur.2020.117232
关键词
Bimetallic Fe-Mn oxides; Biochar; Persulfate activation; Acid red 88
资金
- National Natural Science Foundation of China [51778383]
- Sichuan Science and Technology Program [20CXTD0096, 2019YFS0500]
In this study, a novel porous biochar-supported Fe-Mn composite (Fe-Mn@BC) was prepared as an effective persulfate (PS) activator for the removal of acid red 88 (AR88). Bimetallic Fe-Mn oxides was supported by biochar to prevent agglomeration of metal oxides nanoparticles and provide more active sites for PS activation. The results showed that bimetallic Fe-Mn oxides were evenly dispersed on the surface of biochar (BC), due to its high specific surface area (1570 m(2)/g) and hierarchical porous structure. Fe-Mn@BC + PS showed a high removal rate of 98.84% for AR88, compared with that of Fe-Mn + PS (80.4%) and BC + PS (78.6%). The synergistic mechanism in Fe-Mn@BC for the enhanced PS activation was studied. Moreover, the reaction rate constant of Fe-Mn@BC + PS for the removal of AR88 was 0.03814 min(-1), indicating a fast reaction rate for AR88 removal. The optimal dosages of Fe-Mn@BC and PS were 1 g/L and 2 g/L, respectively. The possible degradation pathways of AR88 were also proposed under the optimal conditions in the Fe-Mn@BC + PS system. The results demonstrate that Fe-Mn@BC is a promising catalyst for PS activation to remove AR88 with high stability and reusability.
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