Jianqiao Zhang,Zhiyang Li,Qian Lei,Dan Zhong,YiXin Ke,WenJie Liu,Lei Yang
The practical application of bismuth-based photocatalysts in the field of micropollutant photodegradation is limited due to their weak light absorption and rapid charge recombination. Herein, we have developed a novel carbon quantum dots-modified N-BiOCl (CDs-N-BiOCl) photocatalyst to activate persulfate (PS) for the complete elimination of endocrine-disruptor bisphenol A (BPA) under visible light irradiation. The photoelectric properties characterization shows that N atoms could replace Cl atoms or adsorb on Bi atoms to form local N 1s states in the BiOCl lattice, accompanied by the introduction of doping energy levels that shorten the electron migration distance. Meanwhile, the decorated CDs could effectively accept the photoinduced electrons from N-BiOCl conduction band to facilitate the charge separation. Thus, the 7%CDs-N-BiOCl (7CNB) nanocomposite synergistically activated PS realized rapid and effective degradation of BPA within 20 min (degradation efficiency and mineralization reached 100 % and 66.4 % respectively). Moreover, the 7CNB/PS system displayed favorable adaptability, durability, and interference resistance. Furthermore, the biotoxicity experiments demonstrated that the photodegradation intermediates promoted the growth of Escherichia coli which indicates its eco-friendliness for practical application. Finally, the electron transfer mechanism and the formation of reactive oxygen species in the photodegradation process were interpreted. In short, this work will present a promising strategy for bismuth-based photocatalysts to be used for the efficient treatment of real water bodies under visible light irradiation.
In this paper, an N -doped BiOCl photocatalyst was prepared and systematically characterized. The results showed that N doping does not change the crystal phase of BiOCl but changes the surface morphology of BiOCl nanosheets and increases specific surface area. N -doped BiOCl broadens the light absorption region, narrows the band gap and promotes the separation of the photoexcited carriers. N could be adsorbed on the Bi or to replace Cl atom in the BiOCl lattice, causing the generation of intermediate energy levels in the band gap of N -BiOCl including N 2p-Cl 2p hybrid states, N 2p-O 2p hybrid states or N 2p state. N -BiOCl achieves about 60% removal efficiency of NO under all-light irradiation and exhibits favorable stability and recyclability. The presence of some H 2 O in the reaction system promotes the photodegradation of NO, while O 2 greatly affects the efficiency of NO removal. Moreover, N doping promotes the formation of •O 2 − and •OH on N -BiOCl photocatalyst under all-light irradiation, resulting in the enhancement of photocatalytic oxidation of NO to NO 3 – . NO could be adsorbed on the surface of N -BiOCl or oxidized into NO 2 – under darkness and further oxidized into NO 3 – under all-light irradiation. However, the accumulation of the final product on the catalyst surface results in a decrease in photoactivity.
危险品化学品经营许可证（带存储）