Effective catalytic reduction of Cr(VI) over TiO2 nanotube supported Pd catalysts

Photocatalytic reduction of nitrate in seawater using C/TiO2 nanoparticles

“…This can be rationalized according to the fact that, the photocatalyst could only provide a constant amount of active sites at a fixed dosage. As the initial nitrate concentration increases, more nitrate ions are adsorbed and accumulated on the surface of the catalyst, which thereby decreases the number of photons reaching the active sites of the catalyst and leads to the decrease of photoreduction rate of nitrate [57,58].…”

Photoreduction of Cr(VI) in water using Bi2O3–ZrO2 nanocomposite under visible light irradiation

“…During the course of light irradiation, 5 mL aliquot was collected at regular intervals. Then the samples were centrifuged and filtered through a millipore filter (polycarbonate membrane nucleopore filter with pore size 0.2 m) to remove the photocatalyst and the filtrate was analyzed by spectrophotometrically using diphenylcarbazide as the coloring agent at max = 540 nm [32]. The photoreduction percentage of Cr(VI) was calculated by the formula given below:…”

Effective Photocatalytic Reduction of Cr(VI) by Carbon Modified (CM)-n-TiO2 Nanoparticles under Solar Irradiation

“…As the incident intensity, catalyst amount and irradiation time are constant, therefore, the availability of active sites will be reduced. Consequently, the photoreduction rate of Cr(VI) decreases as the concentration increases [33,34]. Moreover, an increase in Cr(VI) concentration can lead to the saturation of the limited number of accessible active sites on the photocatalyst surface and/or deactivation of the active sites of the catalyst, resulting in a reduction in the photoreduction rate.…”