Visible photocatalytic degradation of Rhodamine B using Fe(III)-substituted phosphotungstic heteropolyanion

Photocatalytic degradation of rhodamine B based on membrane catalyst of H3O40PW12/quaternized chitosan

“…There is also a possibility that doping PW 12 dosage over 35% results in producing too much of the photogenerated electrons so that the charge carriers could not afford them, and each PW 12 molecule consumption rate of RB is decreased with increasing of PW 12 content (Hua et al . ), which is due to similar electronic characteristics with the semiconductor photocatalysts. Therefore, in this research the optimum amount of PW 12 is 35%.…”

“…However, further increase PW 12 dosage up to over the 35%, which presents a dramatic decrease, and the agglomerated phenomenon of PW 12 is obvious, which makes it difficult for the penetration of UV-visible light to get the inner and produce the light scattering, and hinders the generation of hydroxyl radicals. There is also a possibility that doping PW 12 dosage over 35% results in producing too much of the photogenerated electrons so that the charge carriers could not afford them, and each PW 12 molecule consumption rate of RB is decreased with increasing of PW 12 content (Hua et al 2012), which is due to similar electronic characteristics with the semiconductor photocatalysts. Therefore, in this research the optimum amount of PW 12 is 35%.…”

Facile Ion‐Exchange Synthesis and Visible Light Photocatalytic Studies of Cu2+, Sn2+, and Ag+‐Substituted LiMg0.5Ti0.5O2

“…The low temperature synthesis methods (e.g., ion exchange) can strongly influence the amount of hydroxyl group adsorption on the catalyst surface, their distribution and reactivity . Further, the photocatalytic oxidation of organic pollutants involves mainly, generation of hole in the valence band of photocatalyst due to photoelectron excitation from valence band to conduction band and the adsorbed water molecules on the photocatalyst surface react with the holes to form hydroxyl radicals, very powerful chemical oxidants, which can destroy a wide range of tough organic contaminants . On the other side, electron in the conduction band on the catalyst surface can reduce molecular oxygen to O 2 ●─ .…”

Morphology dependent photocatalytic activity of WO3 nanostructures

“…WO 3 nanoplates have already reported that are excellent photocatalyst for MB degradation which makes it suitable for using in the aspect of the photodegradation of dye from wastewater [31]. It has been already proved that the photocatalytic decomposition of RhB solution agrees with pseudo-first-order kinetics [32,33]; as a result, the rate constants (k) can be calculated by the equation: -ln(c/c 0 ) = kt (where, c 0 is the initial concentration of the RhB at t = 0, and c represents the concentration of RhB at later times t). As seen in Figure 5, the quantity of -ln(c/c 0 ) was plotted as a function of irradiation times for different WO 3 nanostructures to calculate the photocatalytic degradation rate constants from the slope of the line.…”