In situ solvothermal method of C3N5@NH2-MIL-125 composites with enhanced visible-light photocatalytic performance

• Published in: Journal of materials science. Materials in electronics 2022, Vol.33 (1), p.388-398
• Main Authors: He, Xiaokang, Zhu, Dachuan
• Format: Article
• Language: English
• Subjects: Absorption spectra; Catalytic activity; Characterization and Evaluation of Materials; Chemistry and Materials Science; Efficiency; Electromagnetic absorption; Experiments; Materials Science; Optical and Electronic Materials; Particulate composites; Performance degradation; Photocatalysis; Photodegradation; Photoluminescence; Pollutants; Recyclability; Rhodamine; Separation; Stability analysis; Thermal analysis; Thermal stability
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-021-07308-0

In order to increase the visible-light photocatalytic performance for the degradation of Rhodamine B (RhB), C 3 N 5 @NH 2 -MIL-125- x ( x  = 1, 2, 3) were compounded by a typical in situ solvothermal method. XRD, FT-IR, and SEM were employed to investigate the structural characteristics of C 3 N 5 @NH 2 -MIL-125- x which were manifested to be successfully prepared; UV–Visible absorption spectra and photoluminescence spectra of C 3 N 5 @NH 2 -MIL-125- x were carried out to evaluate the photocatalytic activity. The results indicated that the composites of C 3 N 5 @NH 2 -MIL-125- x could boost the visible-light absorption and separation efficiency of photogenerated e − –h + pairs. Then the photocatalytic degradation experiments and the kinetics properties study for RhB showed C 3 N 5 @NH 2 -MIL-125-3 had the best photocatalytic degradation efficiency up to 93.3% under the visible light. Notably, the recyclability experiments with five cycles and thermal analysis proved C 3 N 5 @NH 2 -MIL-125-3 had a high chemical stability and thermal stability (below 500 °C). Moreover, the active species capture experiments demonstrated –O 2 − radicals were the primary reactive species, while the OH − radicals and h + were the subordinate reactive species in the photocatalytic degradation of RhB. In addition, the EIS and TPRs further verified C 3 N 5 @NH 2 -MIL-125-3 possessed a higher separation efficiency of photogenerated e − –h + pairs. This work provides an effective strategy for compositing NH 2 -MIL-125 (Ti) and C 3 N 5 toward photocatalytic degradation of the organic pollutants.