Multifunctional property exploration: Bi4O5I2 with high visible light photocatalytic performance and a large nonlinear optical effect

摘要

Exploration of the versatility of materials is very important for increasing the utilization of materials. Herein, we successfully prepared Bi _(4) O _(5) I _(2) powders via a facile solvothermal method. The Bi _(4) O _(5) I _(2) photocatalyst exhibited significantly higher photocatalytic activity as compared to the common BiOI photocatalyst in the degradation of methyl orange, methylene blue and rhodamine B under visible light irradiation. Especially, for the degradation of methyl orange, the photocatalytic activity of Bi _(4) O _(5) I _(2) is about 10 times that of BiOI. Moreover, Bi _(4) O _(5) I _(2) exhibits an extremely high second harmonic generation response of about 20 × KDP (the benchmark) estimated by the unbiased ab initio calculations. The coexisting multifunction of Bi _(4) O _(5) I _(2) is mainly because of the increased dipole moment due to the stereochemical activity of lone pairs that promotes separation and transfer of photogenerated carriers, then enhances the photocatalytic activity and results in a high second harmonic generation response. This indicates that Bi _(4) O _(5) I _(2) may have good potential applications in photocatalytic and nonlinear optical fields.