Yin Ruonan, Li Yang, Zhong Kangdi, Yao Hang, Zhang Yamin, Lai Kangrong
Department of Physics, Changji University 77# North Beijing Road Changji 831100 China
RSC Adv. 2019 Feb 5;9(8):4539-4544. doi: 10.1039/c8ra08984a. eCollection 2019 Jan 30.
Exploration of the versatility of materials is very important for increasing the utilization of materials. Herein, we successfully prepared BiOI powders a facile solvothermal method. The BiOI 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 BiOI is about 10 times that of BiOI. Moreover, BiOI exhibits an extremely high second harmonic generation response of about 20 × KDP (the benchmark) estimated by the unbiased calculations. The coexisting multifunction of BiOI 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 BiOI may have good potential applications in photocatalytic and nonlinear optical fields.
探索材料的多功能性对于提高材料利用率非常重要。在此，我们通过一种简便的溶剂热法成功制备了BiOI粉末。在可见光照射下，BiOI光催化剂在降解甲基橙、亚甲基蓝和罗丹明B方面表现出比普通BiOI光催化剂显著更高的光催化活性。特别是对于甲基橙的降解，BiOI的光催化活性约为BiOI的10倍。此外，通过无偏计算估计，BiOI表现出极高的二次谐波产生响应，约为20×KDP（基准）。BiOI共存的多功能性主要是由于孤对电子的立体化学活性导致偶极矩增加，促进了光生载流子的分离和转移，进而提高了光催化活性并产生了高二次谐波产生响应。这表明BiOI在光催化和非线性光学领域可能具有良好的潜在应用。
