Abstract
This study proposed a novel electroconductive carbon fiber/circulating fluidized bed fly ash based-geopolymer (CF/CFBFAG) composite, which possessed adjustable electrical conductivity and showed a promising prospect in photocatalytic degradation of dye wastewater. SEM results indicated that carbon fiber was inlaid in the geopolymer matrix uniformly. The electrical conductivity of the CF/CFBFAG composite with 15% CF (15CF/CFBFAG) achieved 8.44 S/m, which was 44.4 thousand times as high as that of the composite without CF. UV-Vis DRS and PL spectra result demonstrated that the absorption edges of the CF/CFBFAG composite was blue-shifted and the photoluminescence intensities gradually decreased with increasing of CF content. The photocatalytic degradation for 5 mg/L of basic violet 5BN (BV5) dye over 15CF/CFBFAG composite can achieve 98.9%. Superoxide radical (·O2−) and photogenerated hole (h+) were the predominant active species in this system.