Optimal H2O2 concentration in advanced oxidation over titanium dioxide photocatalyst

Abstract

The oxidative degradation of Rhodamine B dye under ultraviolet irradiation was studied. The degradation rate was measured with using of smartphone camera. Photocatalytic degradation of the Rhodamine B dye over the P25-TiO2 catalyst has been found to accelerate substantially in the presence of hydrogen peroxide. The relationship between the photocatalytic degradation rate and H2O2 concentration has been studied. The optimal concentration of H2O2 has been found to in the range of 10-25 mM. The proposed mixture of P25 photocatalyst and H2O2 oxidizer can be used to remove organic pollutions from industrial waste water.

Optimization of TiO2-P25 photocatalyst dose and H2O2 concentration for advanced photo-oxidation using smartphone-based colorimetry

“…Our previous study (Danyliuk et al 2021) substantiates the established concentrations of the dye DR23, H 2 O 2 and TiO 2 P25. Usually, the concentrations of dyes in the wastewater from textile industry range from 10 to 50 mg/L (Sohrabi & Ghavami 2008).…”

“…The model solution of DR23 dye had a concentration of 25 mg/L, which is in the mentioned range. Our previous study (Danyliuk et al 2021) showed that the optimal concentration of H 2 O 2 is 10-25 mM for the Rhodamine B dye degradation. As for the dose of TiO 2 , it is in a wide range from 0.2 g/L to 3 g/L, depending on photoreactor geometry and pollutant concentration (Torkaman et al 2016).…”

“…Our previous study (Danyliuk et al 2021) showed that the optimal concentration of the P25 photocatalyst is 1.5 g/L for the microphotoreactor used. Calibration lines for smartphone measurements were constructed by stepwise adding the dye stock solution directly into the reaction vial and capturing color images.…”

UV-light-responsive Ag/TiO2/PVA nanocomposite for photocatalytic degradation of Cr, Ni, Zn, and Cu heavy metal ions

“…The photocatalytic performance in reactive oxygen species production is investigated under UV−vis light irradiation (λ > 350 nm). As shown in Figure 5, the concentration of reactive oxygen species produced by nanocomposite during 180 min is 0.2 mmol/L, which can be used to remove pollution from industrial waste water 24,36 . The horizontal axis shows the duration of the photocatalytic process and the vertical axis shows the concentration of reactive oxygen species.…”

Bioengineered TiO2 Nanoparticles Using Andrographis alata (Vahl) Nees Leaf Extract and Their Antibacterial and Anticancer Activities

“…Green synthesis of TiO 2 NPs has been done with N. citrifolia , Spondias pinnata, Ledebouria revoluta , and Andrographis paniculata , plant parts were effectively involved in the photocatalytic, antimicrobial, anticancer, and larvicidal activities. [ 1–10 ] The current research aimed to explore the antibacterial activity of green mediated TiO 2 NPs using leaf extract of Andrographis alata against Streptococcus pneumonia, B. cereus, Pseudomonas aeruginosa , and E. coli . demonstrate the anticancer activity of TiO 2 NPs against MCF‐7 (human breast cancer) cell line.…”