Enhanced photocatalytic degradation of Remazol Black under visible light illumination through S doped TiO2 (S-TiO2) nanoparticles: Operational factors and kinetic study

<p>The degradation of Remazol Black (RBB) by S-TiO2 photocatalyst was investigated. X-ray diffraction, fourier-transform infrared spectroscopy, scanning electron microscopy, transmission and UV-vis specular reflectance spectroscopy has been used to characterize S-TiO2. The results suggested that the optical absorption edge TiO2 red-shifted addition S dopants bandgap energy 3.02 eV. sulfur species were found be evenly dispersed on crystal lattice as cationic (S6+) which corresponds substitution TiO2. particle size decreased 4-14 nm after doping, indicates contributed an improvement in surface area. RBB achieved 94% 120 min visible light irradiation, a remarkable increase compared bare only able degrade 48% at same time. Optimization pH showed optimum for 3.0, dose 0.8 g L-1. Kinetic study photocatalytic followed pseudo-second-order kinetics model. Reducing activity photodegradation region.</p>