Study on performances of Cu(Fe)/Pd-In/TiO2 catalysts for direct synthesis to hydrogen peroxide and in situ activation degradation of tetracycline
The traditional homogeneous Fenton process has some problems,such as requiring the addition of H2O2 to consume a large amount of iron ions,the narrow pH application range and the generation of a large amount of iron sludge.Through designing a series of x Cu(Fe)/Pd-In/TiO2 bifunctional catalysts,a coupling H2O2 direct synthesis-Fenton(Fenton like)reaction system was constructed to achieve efficient synthesis of H2O2,and in-situ activation degradation of tetracycline in wastewater.XRD,TEM and EPR characterization techniques were used to analyze the crystal structure and microscopic topography of the catalysts,and the effects of pH value,initial mass concentration of tetracycline solution,mass concentration of catalysts and coexisting ions on the tetracycline removal performances of the catalysts were investigated.The results show that the tetracycline removal rate of 2Fe/Pd-In/TiO2 catalyst is the highest(88.1％)after 90 min of reaction under the optimal reaction conditions of temperature of 25℃,pH value of 7,initial mass concentration of tetracycline solution of 30 mg/L,catalyst mass concentration of 0.2 g/L and no coexisting ions.Under the above conditions,the tetracycline removal rate of the 1Cu/Pd-In/TiO2 catalyst is the highest(80.3％)at pH value of 3.The tetracycline removal ability of x Fe/Pd-In/TiO2 catalyst is better than that of x Cu/Pd-In/TiO2 catalyst.This is mainly due to the more uniform dispersion of Fe on the catalyst surfaces and the relatively small particle size of the catalysts.The results of free radical capture experiment and EPR analysis show that·O2- and·OH are the main active oxygen species for oxidative degradation of tetracycline,in which·O2- plays a leading role.
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