Yue Meng,Xiaofeng Zhang,Guoxiang Pan,Shengjie Xia,Zheming Ni
A novel hybrid layered material–Schiff Base-Zinc Complexes intercalated ZnCr-LDHs-supported ZnO–was synthesized by one-step coprecipitation method and characterized by XRD, UV–vis DRS, SEM, TEM, BET, ICP-AES and XPS analysis. The influences of the three Zn components (intercalated between the layers, supported on the surface, distributed in the host layers of the layered material) on the crystallinity and the photocatalytic activity of ZnO/ZnCr-SalenZn-LDHs for Rhodamine B (RhB) degradation were studied in detail by orthogonal design. The results showed that the percentage of the three components has a great effect on the structure and photocatalytic performance of ZnO/ZnCr-SalenZn-LDHs. The SalenZn intercalated between the layers and the Zn distributed in the layers of the layered material were the main influencing factors, and the ZnO supported on the surface of the layered material was the secondary influencing factor. The optimum initial molar ratios were SalenZn:Cr = 0.5, Zn:Cr = 3, and ZnO:Cr = 0.75, respectively, and the photocatalytic degradation efficiency of RhB reached 96.9%. In addition, a possible mechanism of photocatalysis was discussed from the perspectives of photogenerated reactive species and photoinduced carries transfer. While, the regeneration of the best photocatalytic material was also investigated in detail.
A series of novel organic-inorganic hybrid layered materials NiO/ZnNiCr-SalenNi-LDHs containing three different nickel components were prepared by facile coprecipitation . The above LDHs-based materials were characterized by XRD , SEM, TEM, FT-IR, UV–Vis DRS , XPS and XRF , and these results indicate that the different Ni components are located in the layers, intercalated between the layers and sported on the surface of the LDHs materials. The effects of different Ni components on the photocatalytic properties of the materials were investigated, and the regenerative ability of the hybrid material with the highest photocatalytic activity was explored. The introduce of Ni 2+ , SalenNi and NiO can affect the photocatalytic properties of the hybrid materials, in which SalenNi has the greatest effect on the photocatalytic performance of the hybrid materials. The material prepared under molar ratio conditions of Zn(NO 3 ) 2 ·6H 2 O: Ni(NO 3 ) 2 ·6H 2 O: Cr(NO 3 ) 3 ·9H 2 O = 3 : 1: 1, SalenNi: Cr(NO 3 ) 3 ·9H 2 O = 1 : 1, NiO: Cr(NO 3 ) 3 ·9H 2 O = 0.75 : 1 shows the strongest photocatalytic performance, and the degradation rate of Rhodamin B (RhB) can reach 93.8%. Meanwhile, this hybrid material has strong stability and high recycling efficiency. In addition, the photoactive species quenching experiments indicate that •O 2 − and h VB + are the main active species in the photocatalytic degradation of RhB.
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