Multifunctional performance of gC_3N_4-BiFeO_3-Cu_2O hybrid nanocomposites for magnetic separable photocatalytic and antibacterial activity

摘要

Highly active gC~(3)N~(4)-BiFeO~(3)-Cu~(2)O nanocomposites were successfully prepared via a facile, cost effective and eco-friendly method of hydrothermally wet precipitation combined with ultrasonic dispersion process. The prepared samples were characterized by XRD, FTIR, HRSEM, EDS, TEM, UV–Vis DRS, PL, VSM, BET and electrochemical properties. By means of these analysis for examine the crystal phase, nanostructure, band gap and light-harvesting properties were carried out. UV-DRS spectra indicate that the bandgap of g-C~(3)N~(4)(2.7 eV) reduced to 2.59 and 2.21 eV by mixed with corresponds to BiFeO~(3)and BiFeO~(3)/Cu~(2)O nanomaterials. The ideal photocatalytic activity of the gC~(3)N~(4)-BiFeO~(3)-Cu~(2)O nanocomposites, where RhB dye under visible light irradiation which was up to 4.36 and 2.52 times as the higher photodegradation ability to compare pristine g-C~(3)N~(4)and gC~(3)N~(4)-BiFeO~(3 )catalyst. The magnetization was confirmed by VSM studies, and hence, after the photocatalytic reaction, the magnetically separable catalyst can be quickly separated from the water by an external magnetic field. The superior photocatalytic performance is due to the synergistic effect on the interface of BiFeO~(3)/Cu~(2)O in the gC~(3)N~(4)-BiFeO~(3)-Cu~(2)O nanocomposites has reduced the bandgap which enables high separation efficiency of the charge carrier, suppressed recombination rate and their high surface area. Moreover, the chief gC~(3)N~(4)-BiFeO~(3)-Cu~(2)O catalyst can exhibited the lesser charge transfer resistance (impedance), enhances of photocurrent responses, whereas exposed to the development of photocatalytic appearance and more charge carrier ability. Also, the antibacterial activity of the gC~(3)N~(4)-BiFeO~(3)-Cu~(2)O nanocomposite has showing a well deactivation in both G_(+)( S. aureus ) and G_(−)( E. coli ) bacteria’s whereas compare to other prepared samples.