Fe/Ag Catalytic Ozonation for the Degradation of Phenol

doi:10.19657/j.geoscience.1000-8527.2020.061

Abstract

Abstract:

To study the effect of bimetallic catalysts on the removal of organic pollutants, the simulated phenol wastewater was subjected to Fe/Ag catalytic ozonation treatment. The catalyst was characterized by various characterization methods (SEM, BET and XRD), and the degradation effects due to the different catalyst types and dosages and initial pH were evaluated. The results show that compared with Fe, the specific surface area of Fe/Ag is reduced by 22.8%. In the reaction system of Fe/Ag/O₃ and phenol-containing wastewater, the reaction follows the mechanism of direct action of ozone and the free radicals (·OH, ·O₂, H₂O₂). Fe/Ag and ozone show good synergistic effects in the reaction. The phenol and COD removal rate were, respectively, 18.4% and 29.4% higher than that of ozone oxidation alone (initial phenol concentration=300 mg/L, catalysts dosage=1.00 g, and initial solution pH=6.3).

Key words: Catalytic ozonation, Fe/Ag, phenol degradation, synergistic effect, free radical

CLC Number:

HOU Ying, XU Jinming, LI Ping, MAO Junyan, ZHANG Yuanhao, SU Junjie, CHEN Nan, HU Weiwu. Fe/Ag Catalytic Ozonation for the Degradation of Phenol[J]. Geoscience, 2021, 35(03): 711-719.

Figures/Tables 10

Fig.1 Schematic diagram showing the ozonation reactor setup

Fig.2 XRD pattern of Fe/Ag and Fe

Table 1 BET data of Fe and Fe/Ag

催化剂类型	比表面积/(m²/g)	孔隙体积/(cm²/g)	孔径/nm
Fe	5.159	0.012	2.708
Fe/Ag	3.985	0.006	2.708

Fig.3 SEM images of Fe and Fe/Ag

Table 2 Reaction rate constant (K) for the removal of phenol and COD, with added catalyst and ozone alone

类型	苯酚		COD
类型	K/min^-1	R²	K/min^-1	R²
单独臭氧	0.027	0.990	0.010	0.940
Fe	0.037	0.994	0.016	0.935
Fe/Ag	0.098	0.973	0.022	0.952

Fig.4 Effects of ozone oxidation alone and catalyst ozonation

Table 3 Fe/Ag ozonation reaction rate constant (K) for the removal of phenol and COD with different catalyst dosage

投加量/g	苯酚		COD
投加量/g	K/min^-1	R²	K/min^-1	R²
0.25	0.086	0.971	0.012	0.902
0.50	0.065	0.977	0.016	0.928
1.00	0.098	0.973	0.022	0.952
2.50	0.061	0.985	0.022	0.936

Fig.5 Effect of Fe/Ag dosage

Fig.6 Effect of initial pH on the removal of phenol and COD

Fig.7 Removal of phenol and COD by three different radical traps

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