Fe(III)/rGO/Bi2MoO6 Composite Photocatalyst Preparation and Phenol Degradation by Photocatalytic Fenton Synergy

doi:10.15541/jim20200437

Abstract

Abstract:

The photocatalysis-Fenton technology coupling can efficiently degrade organic pollutants. In this study, Fe(III)-doped rGO/Bi₂MoO₆ composite catalyst (Fe(III)/rGO/Bi₂MoO₆) was prepared by solvothermal method, and the photocatalysis-Fenton synergy system was constructed by adding H₂O₂. The phenol degradation activity under 3 h visible light irradation is 82%, much higher than that of photocatalysis alone (18%) or renton reaction (48%), and further optimization can achieve full degration of phenol. This can be mainly attributed to the transformation of the valence state through the gain and loss of Fe electrons, which serves as a bridge to realize the photocatalysis- Fenton synergy. Meanwhile, the excellent electrical conductivity of graphene overcomes the difficulty of separating photo-generated electron holes in photocatalysis, and promotes the cyclic reaction of Fe³⁺/Fe²⁺, and then accelerates the Fenton reaction to produce more free hydroxyl groups (?OH), which further improves the degradation efficiency. Effects of Fe(III) content, catalyst dosage, H₂O₂ content, and pH on the synergy degradation performance were investigated. The quenching experiment proves that ?OH is one of the main active species in the degradation system, while ?O₂^- and H⁺ also have a certain effect on the degradation activity. The mechanism of Fe(III)/rGO/Bi₂MoO₆ photocatalysis-Fenton synergy degradation is also proposed based on the present experimental results.

Key words: Fe(III)/rGO/Bi₂MoO₆, photocatalysis-Fenton, synergy, degradation

CLC Number:

O643

AN Weijia, LI Jing, WANG Shuyao, HU Jinshan, LIN Zaiyuan, CUI Wenquan, LIU Li, XIE Jun, LIANG Yinghua. Fe(III)/rGO/Bi₂MoO₆ Composite Photocatalyst Preparation and Phenol Degradation by Photocatalytic Fenton Synergy[J]. Journal of Inorganic Materials, 2021, 36(6): 615-622.

Figures/Tables 12

Fig. 1 (a) SEM images of Bi2MoO6 and (b) rGO/Bi2MoO6; TEM (c) and HRTEM (d) images of Fe(III)/rGO/Bi2MoO6

Fig. 2 XRD patterns of Bi2MoO6, rGO/Bi2MoO6, Fe(III)/rGO/ Bi2MoO6

Fig. 3 XPS spectra of the compared composites (a) Full spectrum analysis; (b-f) XPS spectra of various element; (g) XPS spectra of valence band in Bi2MoO6

Fig. 4 (a) Phenol degradation activity by photocatalysis, Fenton, and photocatalysis-Fenton synergy, and (b) degradation rate constant over different conditions

Fig. 5 (a) Photocatalysis-Fenton synergy degradation stability test, (b) TOC removal of phenol over photocatalysis, Fenton reaction, and photocatalysis-Fenton synergy

Fig. 6 Photocurrent response curves of different composites (a) before and (b) after adding H2O2

Fig. 7 (a) Influence of degradation activity with the addition of quenchers, and (b) concentration of ?OH generated at photocatalysis, Fenton and photocatalysis-Fenton synergy

Fig. 8 Mechanism of photocatalysis-Fenton synergy degradation over Fe(III)/rGO/Bi2MoO6

Fig. S1 (a) Diffusive UV-Vis spectra and (b) Kubelka- Munk conversion curve of the composites

Fig. S2 (a, b) the comparison of degradation activity over synergy and photocatalysis, Fenton

Fig. S3 Comparison of the activity of different phenol removal efficiency (a) different proportions of Fe (III) (C0 = 5 ppm); (b) Different catalyst dosages (C0 = 5 ppm, 20% Fe (III)/rGO/Bi2MoO6); (c) different amounts of hydrogen peroxide (C0 = 5 ppm, 20% Fe (III)/rGO/Bi2MoO6, catalyst concentration: 1.0 g/L); (d) different pH (C0 = 5 ppm, 20 % Fe (III)/rGO/Bi2MoO6, catalyst concentration: 1.0 g/L, H2O2 = 19.5 mmol/L) *ppm=mg/L

Fig. S4 (a) EIS of different photocatalyst composites; (b) EIS of Fe(III)/rGO/Bi2MoO6 and Fe(III)/rGO/Bi2MoO6 + H2O2

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Fe(III)/rGO/Bi₂MoO₆ Composite Photocatalyst Preparation and Phenol Degradation by Photocatalytic Fenton Synergy

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