| Sunlight-assisted decomposition of cephalexin by novel synthesized NiS-PPY-Fe3O4 nanophotocatalyst |
| Paper ID : 1280-UFGNSM-FULL |
| Authors: |
|
firoozeh Torki * shahreza, islamic azad univercity , postal code: 86145311 |
| Abstract: |
| The wide application of antibiotics in human and veterinary medicine has led to large-scale dissemination of toxic pollutants in the environment. Among the environmental protection technologies, the semiconductor based photocatalysis using solar energy has attracted considerable attention in the field of environmental remediation and solar energy utilization. Advance oxidation processes (AOPs) are capable to destroy environmentally persistent pollutants by using photocatalysts activated by photons with energy higher or equal to the band gap energy of the photocatalyst. In this research, the catalytic performance of NiS and NiS immobilized into the matrix of magnetite polypyrrole core-shell (Fe3O4@PPY) for degradation of cephalexin was investigated. After characterization, by FT-IR, TG, XRD, VSM, DRS, PL, Brunauer–Emmett–Teller (BET), TEM and SEM techniques, the photocatalysts were used for degradation of a pharmaceutical pollutant; cephalexin, under UV and sunlight irradiations. The results indicated that application of PPY-Fe3O4 as the catalyst supports significantly enhanced the photocatalytic activity of NiS. The degradation efficiency obtained by NiS-PPY-Fe3O4 was higher than the value obtained by NiS alone. Moreover, by use of the support, a significant red shift was occurred on the band gap energy of NiS resulting higher degradation of the pollutant under sunlight irradiation. Paramagnetic nature of the NiS-PPY-Fe3O4 photocatlyst enabled effective separation of the used catalysts from the reaction solution with the aid of an external magnetic field and avoiding the tedious filtration or centrifugation. Upon regeneration, the photocatalyst retained most of its initial efficiency. Addition of H2O2 to the photocatalyst mixture had an enhancing effect on the cephalexin degradation. The photodegradation products were identified by GC–MS technique. |
| Keywords: |
| Cephalexin; Magnetic nanophotocatalyst; Fe3O4@PPY-NiS; Sunlight; Photodegradation |
| Status : Paper Accepted (Poster Presentation) |
