Synergistic effect of adsorption and photocatalysis for the degradation of toluene by TiO2 loaded on ACF modified by Zn(CH3COO)2
2021
Activated carbon fiber (ACF) was modified by Zn(NO₃)₂, ZnCl₂, and Zn(CH₃COO)₂), respectively, and then, TiO₂ was loaded on the modified ACFs. The adsorption and photocatalysis performance were explored through the removal of toluene, and TiO₂/ACF-Ac modified by Zn(CH₃COO)₂) with the best toluene degradation performance was selected. The characterization results of a scanning electron microscope (SEM), X-ray diffraction spectra (XRD), and Fourier transform infrared spectrometer (FTIR) indicated that the samples were rough, and TiO₂ was mainly loaded on the surface containing large amount of oxygen-containing functional groups in anatase phase. An ultraviolet-visible diffuse reflectance spectrophotometer (UV-vis DRS) revealed that the catalyst enhanced the light response range. The photoelectric chemical experiment results demonstrated that the modified ACFs remarkably improved the charge transmission and the separation efficiency of electrons and holes. The adsorption saturation time reached 40 h and toluene photodegradation rate was 70%. Four toluene degradation intermediate products were determined by GC-MS, and the removal mechanism of toluene by TiO₂/ACF-Ac was discussed.
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