Heterogeneous activation of Oxone by CoxFe3−xO4 nanocatalysts for degradation of rhodamine B

纳米材料基催化剂 罗丹明B 化学 催化作用 纳米颗粒 动力学 尖晶石 苯酚 光催化 核化学 降级(电信) 无机化学 材料科学 纳米技术 有机化学 冶金 物理 电信 量子力学 计算机科学
作者
Shengnan Su,Weilin Guo,Yanqiu Leng,Chunliang Yi,Zhewen Ma
出处
期刊:Journal of Hazardous Materials [Elsevier BV]
卷期号:244-245: 736-742 被引量:271
标识
DOI:10.1016/j.jhazmat.2012.11.005
摘要

The removal of Rhodamine B (RhB) by Co(x)Fe(3-x)O(4) magnetic nanoparticles activated Oxone has been performed in this study. A series of Co(x)Fe(3-x)O(4) nanoparticles was synthesized using a hydrothermal method. The synthetic Co(x)Fe(3-x)O(4) nanoparticles were characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that they were spinel structures and Co was introduced into their structures. The performances of Co(x)Fe(3-x)O(4) nanocatalysts on the activation of Oxone for removal of RhB were investigated and we found that the higher cobalt content in the catalyst, the better removal performance was resulted. A series experiments of reaction conditions were also performed, which confirmed that weak acidic, higher temperature, higher dosages of Co(x)Fe(3-x)O(4) nanocatalyst and Oxone and lower concentration of RhB were favored for the degradation of RhB. The pseudo-first order kinetics was observed to fit the Co(x)Fe(3-x)O(4)/Oxone process. Furthermore, the reaction mechanism was discussed and the scavenging effect was examined by using phenol and tert-butyl alcohol which indicated that sulfate radicals were the dominating reactive species responsible for the degradation process. Finally, the stability of Co(x)Fe(3-x)O(4) nanocatalyst was studied.
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