Sol-gel Synthesis of ZnO Nanoparticles and ZnO-TiO2-SiO2 Nanocomposites and Their Photo-catalyst Investigation in Methylene Blue Degradation

In  this  work  firstly  zno  nanoparticles  were  synthesized  via  a simple  precipitation method. at  the  second  step  titanium  dioxide and  silicon  dioxide  shell  were  synthesized  on  the  core.  for preparation zno-tio2-sio2  the  sol product was  calcinated  at 500 ºc  for  2h.  properties  of  the  product  were  examined  by  x-ray diffraction  pattern  (xrd),  scanning  electron  microscope  (sem) and  fourier  transform  infrared  (ft-ir)  spectroscopy.  the  photo-catalytic behavior of zno-sio2-tio2 nanocomposite was evaluated using  the degradation of a methylene blue aqueous  solution under visible  light  irradiation.  the  results  show  that  zno-sio2-tio2 nanocomposites have applicable photo-catalytic performance.