Toward efficient dye degradation and the bactericidal behavior of Mo-doped La₂O₃ nanostructures

Abstract

In this study, different concentrations (0, 0.02, 0.04 and 0.06 wt. %) of Mo doped onto La2O3 nanostructures were synthesized using one-pot co-precipitation process. The aim was to study the...

The enhanced photocatalytic performance and first-principles computational insights of Ba doping-dependent TiO2 quantum dots

“…45–47 Generally, the PCA is influenced by the surface area of the nanocatalyst, as a large surface area provides more active sites, increases the number of redox reactions on the nanocatalyst surface and results in the degradation of MB. 48,49 The results show that the MB dye degrades maximally when treated with Ba-doped TiO 2 rather than with the TiO 2 QDs. For the Ba-doped TiO 2 photocatalysts, the possible charge separation mechanism is described as follows.…”

“…TiO 2 peak intensity observed at 414 nm demonstrated the high recombination rate of e --h + couples, which influence TiO 2 photocatalytic performance significantly. Furthermore, peak intensity was reduced, which indicates a lower charge recombination rate upon doping showed higher photocatalytic activity [34,35]. These emission transitions have been credited to unilaterally charged oxygen vacancies in TiO 2 and arise when a photogenerated h + mix with an etaking up oxygen vacancies [36].…”

“…Furthermore, in basic medium (pH=12), prepared nanocatalyst exhibits efficient dye degradation results as 92.17, 97, and 99.5% for TiO 2 and Ba (2%, 4%)-doped TiO 2 , as illustrated in Fig 7c . The increased electrostatic interaction between the positively charged dye and the negatively charged catalyst in the basic dye solution causes surface charges to become negative, which facilitates dye degradation [45][46][47]. Generally, the PCA is influenced by the surface area of the nanocatalyst as the large surface area provides more active sites, increases the number of redox reactions on the nanocatalyst surface and results in degradation of MB [48,49]. Results showed that the MB dye degrades maximum when treated with Ba doped TiO 2 rather than TiO 2 QDs.…”

“…Furthermore, the peak intensity was reduced, which indicates a lower charge recombination rate upon doping and thus higher photocatalytic activity. 34,35 These emission transitions have been credited to unilaterally charged oxygen vacancies in TiO 2 and arise when a photogenerated h + mixes with an e À taking up oxygen vacancies. 36 When the concentration of Ba increases, the peak intensity reduces as higher concentrations restrict the inter-nuclear space, and the emission intensity begins to ow towards the energy-killing domains.…”

Improved catalytic activity and bactericidal behavior of novel chitosan/V2O5 co-doped in tin-oxide quantum dots

“…Catalytic activity usually depends on the surface area, crystallinity, and morphology of QDs. In general, the catalyst having a wide surface area has shown higher catalytic effectiveness because the catalyst may provide more active sites, 60,61 and the pH of the solution has a significant impact on degradation efficiency. In acidic media, catalytic activity was higher, which might be assigned to increased H + ions production absorbed by the surface of the nanostructure.…”