Black phosphorus nanosheets and ZnAl-LDH nanocomposite as environmental-friendly photocatalysts for the degradation of Methylene blue under visible light irradiation

• Published in: Applied clay science 2021-01, Vol.200, p.105902, Article 105902
• Main Authors: Yang, Junshan, Jing, Ruisen, Wang, Pengfei, Liang, DeRui, Huang, Hanhan, Xia, Caifeng, Zhang, Qian, Liu, Aiju, Meng, Zilin, Liu, Yunyan
• Format: Article
• Language: English
• ISSN: 0169-1317; 1872-9053
• DOI: 10.1016/j.clay.2020.105902

Environmental-friendly photocatalysts and high utilization of solar energy have attracted much attention; hence, it is important to develop highly efficient and non-toxic photocatalysts. As a novel two-dimensional semiconductor, black phosphorus nanosheets (BPNs) have gotten extensive solicitude due to their tunable bandgap and high carrier mobility. Here, we report a new kind of environmental-friendly nanocomposite consisting of ZnAl-layered double hydroxides (LDH) and BPNs, and is obtained by electrostatic self-assembly method. The acquired photocatalysts were studied by XRD, TEM, EDX, UV–Vis diffuse reflectance spectra, mott-schottky, EIS and ESR techniques so as to gain the information on morphology, structure and properties. Compared to pristine ZnAl-LDH and BPNs, the composite photocatalyst shows the best photocatalytic activity for methylene blue (MB) degradation under visible light irradiation, and the 99% of MB was degraded in 80 min. The improvement of photocatalytic performance is mainly because BPNs provide an additional transfer channel of electrons and holes. The nanocomposites have opened up a new idea to construct black phosphorus (BP) based photocatalysts for environmental remediation. •BP/LDH show excellent activity for MB degradation under visible light irradiation.•An environmental-friendly photocatalyst is obtained by electrostatic self-assembly.•The mechanism of BPNs enhanced photocatalytic activity is proposed.