期刊
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
卷 398, 期 -, 页码 86-94出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molcata.2014.11.024
关键词
Substituted magnetite; Heterogeneous degradation; Oxone; EXAFS; Sulfate radicals
资金
- National Natural Science Foundation of China [41172045, 41302026]
- Institute Cooperation program, Chinese Academy of Sciences [2BY2332301]
- Team Project of Natural Science Foundation of Guangdong Province, China [S2012030006144]
In this study, the effect of incorporation of transition metals (i.e., Co, Mn, Cr, and Ni) into the magnetite on the reactivity towards Oxone activation was investigated at neutral pH. The magnetite samples were characterized by XRD and EXAFS. Co, Cr, and Ni were in the valences of +2, +3, and +2, respectively, while Mn was in the valences of +2 and +3. These cations occupied the octahedral sites of magnetite, but the distribution of Mn and Ni on the octahedral sites of magnetite surface increased with an increase of substitution extent. The activity of magnetites in Oxone activation was investigated through Acid Orange II (AOII) degradation at an initial pH of 7.0 with or without phosphate-buffered solution. In neutral medium, the AOII degradation by Mn, Cr, and Ni substituting magnetites followed pseudo-first-order kinetics. The incorporation of Co, Mn, and Ni improved the catalytic activity of magnetite in the order Mn
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