Abstract
KNbO3/Bi2O3 composite materials with different percentage of KNbO3 have been prepared by simple methods The structural and optical properties of the resulting samples are thoroughly characterized by XRD, UV–vis DRS, SEM, TEM, and N2-sorption analysis. The photocatalytic activities of the as-prepared materials for the degradation of rhodamine B (RhB) and methyl orange (MO) are evaluated under UV-light irradiation. The results indicate that the optimal loading amount of KNbO3 is 30wt.% (i. e., 30wt.% KNbO3/Bi2O3), The rate constants of which for the RhB and MO degradation are about 3.7 times and 4.1 times faster than those of pure Bi2O3 and approximately 6.9 times and 7.1 times faster than those of pure KNbO3, respectively. Based on a series of characterizations, it can be concluded that the migration of photogenerated carriers adopts a direct Z-scheme mechanism and O2−, OH, and h+ are the main reactive species in the photocatalytic reactions.
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