Heterogeneous Fenton Degradation of Rhodamine B in Aqueous Solution Using Fe-Loaded Mesoporous MCM-41 as Catalyst
2018
Xu, Dongyan | Sun, Xiaowei | Zhao, Xi | Huang, Lixin | Qian, Yi | Tao, Xumei | Guo Qingjie,
In this study, mesoporous Fe/MCM-41 was prepared and employed as a heterogeneous Fenton catalyst for the oxidative degradation of dye rhodamine B (RhB) in aqueous solution. Structural and morphological characterizations were performed using XRD, BET, FTIR, and SEM-EDX techniques. Fe/MCM-41 exhibits high catalytic activity for degradation of RhB in the Fenton-like system consisting of solid catalyst and H₂O₂. ·OH radicals were demonstrated to be the dominant active species by using tert-butanol as a probe compound. It was suggested that dye adsorption and ·OH generation are independent of each other during the heterogeneous Fenton process at the studied initial dye and H₂O₂ concentrations. The intermediates of RhB degradation were identified by LC-MS technique in this study. It can be inferred that the destructions of the conjugated structure and N-de-ethylation happen simultaneously during the heterogeneous Fenton process.
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