Abstract
H4SiW6Mo6O40/SiO2was sensitized by H2O2solution that significantly improved its catalytic activity under simulated natural light. Degradation of basic fuchsin was used as a probe reaction to explore the influencing factors on the photodegradation reaction. The results showed that the optimal conditions were as follows: initial concentration of basic fuchsin 8 mg/L, pH 2.5, catalyst dosage 4 g/L, and light irradiation time 4 h. Under these conditions, the degradation rate of basic fuchsin is 98%. The reaction of photocatalysis for basic fuchsin can be expressed as the first-order kinetic model. After being used continuously for four times, the catalyst kept the inherent photocatalytic activity for degradation of dyes. The photodegradation of malachite green, methyl orange, methylene blue, and rhodamine B were also tested, and the degradation rate of dyes can reach 90%–98%.
Highlights
In the past few years, a great deal of attention has been paid to water-treatment technology [1]
TiO2 has been investigated widely in photocatalytic degradation of organic chemicals in water under ultraviolet (UV) light, constituting only 4% of the solar light, it cannot be effectively activated under solar light irradiation due to its wide intrinsic band gap
H4SiW6Mo6O40/SiO2 was prepared by a sol-gel method and sensitized by H2O2 solution
Summary
In the past few years, a great deal of attention has been paid to water-treatment technology [1]. Advanced oxidation processes (AOPs), which have the potential to completely mineralize organic compounds to CO2 and H2O, have shown a great potential as a low-cost and high efficiency water treatment technology [4]. TiO2 has been investigated widely in photocatalytic degradation of organic chemicals in water under ultraviolet (UV) light, constituting only 4% of the solar light, it cannot be effectively activated under solar light irradiation due to its wide intrinsic band gap. Visible-light responsive photocatalysts have been investigated quite intensively in recent years, including modified TiO2 [12,13,14,15]. The photocatalytic degradation of some dyes (a) having different chemical structures with the catalyst under simulated natural light irradiation was investigated
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