ADSORPTION-COUPLED PHOTOCATALYTIC DEGRADATION OF ALKANE VOCs BY TCN-TiO2/Zn(CH3COO)2-ACF COMPOSITES

Abstract

Abstract: The tubular carbon nitride (TCN) was prepared by hydrothermal lateral thermal stripping method, the ACF was successfully modified with Zn(CH₃COO)₂ by ultrasonic-vacuum impregnation method, TCN-TiO₂/Zn(CH₃COO)₂-ACF composites were prepared by loading TiO2 onto modified ACF. The composites were characterized by SEM, TEM, XRD, BET, XPS, FT-IR, UV-vis, PL, and I-T photocurrent response, and the degradation mechanism and degradation efficiency of n-hexane were studied. The results showed that the degradation effect of n-hexane was best when the mass fraction of TCN was 4% under light conditions, and the optimum preparation conditions were calcination at 450 ℃after loading twice. Under these conditions, the degradation rate of n-hexane gas with concentration of 200 mg/m³ at a space velocity of 1 000 h^-1 could reach 87.9%.When ACF was modified by Zn(CH₃COO)₂, the adsorption capacity of ACF was enhanced, the heterojunction of TCN and TiO₂ was formed, and the recombination rate of electron-hole was reduced.Thus, the adsorption-coupling photocatalytic efficiency of the composite photocatalyst could be improved.

Key words: TCN, TiO₂, Zn(CH₃COO)₂, modified, ACF, adsorption coupled photocatalysis, n-hexane

References

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ADSORPTION-COUPLED PHOTOCATALYTIC DEGRADATION OF ALKANE VOCs BY TCN-TiO₂/Zn(CH₃COO)₂-ACF COMPOSITES

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