Enhanced photocatalytic degradation of Remazol Black under visible light illumination through S doped TiO2 (S-TiO2) nanoparticles: operational factors and kinetic study
Penulis/Author
Prof. Dr. Endang Tri Wahyuni, M.S. (1); RISKA DWIYANNA (2); Prof. Drs. Roto, M.Eng, Ph.D. (3); KUSUMA PUTRI SUWONDO (4)
Tanggal/Date
15 2021
Kata Kunci/Keyword
Abstrak/Abstract
The degradation of Remazol Black (RBB) by S-TiO2
photocatalyst was investigated. X-ray diffraction, fouriertransform infrared spectroscopy, scanning electron
microscopy, transmission electron microscopy, and UV-vis
specular reflectance spectroscopy has been used to
characterize S-TiO2. The results suggested that the optical
absorption edge of TiO2 was red-shifted by the addition of
S dopants and the bandgap energy was 3.02 eV. The sulfur
species were found to be evenly dispersed on the TiO2
crystal lattice as cationic sulfur (S6+) which corresponds to
the cationic substitution on TiO2. The particle size
decreased to 4-14 nm after S doping, which indicates that
the addition of S dopants has contributed to an
improvement in the photocatalyst surface area. The
degradation of RBB was achieved 94?ter 120 min
visible light irradiation, a remarkable increase compared
to bare TiO2 which was only able to degrade 48% of RBB
at the same time. Optimization of the pH showed that the
optimum pH for RBB degradation was 3.0, and the
photocatalyst dose was 0.8 g L-1
. Kinetic study showed
that S-TiO2 photocatalytic degradation of RBB followed
the pseudo-second-order kinetics model. Reducing the
bandgap has been found to increase the activity of
photodegradation in the visible light region
Enhanced photocatalytic degradation of Remazol Black under visible light illumination through S doped TiO2 (S-TiO2) nanoparticles_ operational factors and kinetic study.pdf
