Comparison of the photocatalytic performance of S-SnSe/GO and SnSe/S-GO nanocomposites for dye photodegradation

摘要

A comparative study between the visible-light photocatalytic activity of S-doped SnSe (S-SnSe)/GO and SnSe/Sdoped GO (S-GO) nanocomposites was presented. A faster photocatalytic activity was observed for the SnSe/SGO nanocomposites. It was understood that the faster photocatalytic activity of SnSe/S-GO nanocomposites was due to the surface of S-GO sheets. Cracked surface of the S-GO caused to formation SnSe nanoparticles (NPs) with an average diameter of 5 nm, while, it was observed a mixed morphology of nanorods (NRs) and NPs for the S-SnSe/GO nanocomposites. X-ray diffraction patterns, Raman, and X-ray photoelectron spectroscopy results of the GO and S-GO sheets indicated that the degree of oxidation of S-GO sheets was lower than the pristine GO. The photogenerated electron lifetime of the SnSe/S-GO nanocomposites was approximately 630 ns, while, this time was almost 26 ns for the S-SnSe/GO nanocomposites, resulting the photogenerated electron-hole pair (EHP) lifetime for the SnSe/S-rGO nanocomposites was higher.