Fe-Mn-sepiolite as an effective heterogeneous Fenton-like catalyst for the decolorization of reactive brilliant blue

作者：Su, Chengyuan^*; Li, Weiguang; Liu, Xingzhe; Huang, Xiaofei; Yu, Xiaodan

来源：Frontiers of Environmental Science and Engineering, 2016, 10(1): 37-45.

DOI：10.1007/s11783-014-0729-y

• Fe-Mn-sepiolite catalyst
• heterogeneous Fenton-like
• reactive brilliant blue
• homogeneous precipitation method
• hydroxyl radical

A study of the decolorization of reactive brilliant blue in an aqueous solution using Fe-Mn-sepiolite as a heterogeneous Fenton-like catalyst has been performed. The Fourier transform infrared (FTIR) spectra of the catalyst showed bending vibrations of the Fe-O. The Xray diffraction (XRD) patterns of the catalyst showed characteristic diffraction peaks of alpha-Fe2O3, gamma-Fe2O3 and MnO. A four factor central composite design (CCD) coupled with response surface methodology (RSM) was applied to evaluate and optimize the important variables (catalyst addition, hydrogen peroxide dosage, initial pH value and initial dye concentration). When the reaction conditions were catalyst dosage = 0.4 g, [H2O2]= 0.3 mL, pH = 2.5, [reactive brilliant blue](o) = 50mg.L-1, and volume of solution = 500 mL at room temperature, the decolorization efficiency of reactive brilliant blue was 91.98% within 60 min. Moreover, the Fe-Mn-sepiolite catalyst had good stability for the degradation of reactive brilliant blue even after six cycles. Leaching of iron ions (< 0.4 mg.L-1) was observed. The decoloring process was reactive brilliant blue specific via a redox reaction. The benzene ring and naphthalene ring were first oxidized to open ring; these were then oxidized to the alcohol and carboxylic acid. The reactive brilliant blue was decomposed mainly by the attack of center dot OH radicals including surface-bound center dot OH radicals generated on the catalyst surface.

• 出版日期2016-2
• 单位哈尔滨工业大学; 广西师范大学