Iron-glutamate-silicotungstate ternary complex as highly active heterogeneous Fenton-like catalyst for 4-chlorophenol degradation

doi:10.1016/S1872-2067(15)61011-7

Abstract

Abstract:

A novel iron-glutamate-silicotungstate ternary complex (Fe^ШGluSiW) was synthesized from ferric chloride (Fe^III), glutamic acid (Glu), and silicotungstic acid (SiW), and used as a heterogeneous Fenton-like catalyst for 4-chlorophenol (4-CP) degradation at neutral pH value. The prepared Fe^ШGluSiW was characterized using inductively coupled plasma atomic emission spectroscopy, thermogravimetry, Fourier-transform infrared spectroscopy, ultraviolet-visible diffuse reflectance spectroscopy, X-ray diffraction, and field-emission scanning electron microscopy. The results showed that Fe^ШGluSiW has the formula [Fe(C₅H₈NO₄)(H₂O)]₂SiW₁₂O₄₀·13H₂O, with glutamate moiety and Keggin-structured SiW₁₂O₄₀^4- heteropolyanion. The catalyst showed high catalytic activity in 4-CP degradation in the dark and under irradiation. Under the conditions of 4-CP 100 mg/L, Fe^ШGluSiW 1.0 g/L, H₂O₂ 20 mmol/L, and pH = 6.5, 4-CP was completely decomposed in 40 min in the dark and in 15 min under irradiation. When the reaction time was prolonged to 2 h, the corresponding total organic carbon removals under dark and irradiated conditions were ca. 27% and 72%, respectively. The high catalytic activity of Fe^IIIGluSiW is resulted from hydrogen bonding of H₂O₂ on the Fe^IIIGluSiW surface. The enhanced degradation of 4-CP under irradiation arises from simultaneous oxidation of 4-CP through Fenton-like and photocatalytic processes respectively catalyzed by ferric iron and the SiW₁₂O₄₀^4- hetropolyanion in Fe^ШGluSiW.

Key words: Polyoxometalate, Silicotungstate, Heterogeneous catalysis, Fenton oxidation, 4-Chlorophenol degradation

Dongju Yin, Lizhong Zhang, Xiufeng Zhao, Han Chen, Qian Zhai. Iron-glutamate-silicotungstate ternary complex as highly active heterogeneous Fenton-like catalyst for 4-chlorophenol degradation[J]. Chinese Journal of Catalysis, 2015, 36(12): 2203-2210.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(15)61011-7

https://www.cjcatal.com/EN/Y2015/V36/I12/2203

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