Back to Search
Start Over
Mechanism and DFT Study of Degradation of Organic Pollutants on Rare Earth Ions Doped TiO2 Photocatalysts Prepared by Sol-Hydrothermal Synthesis
- Source :
- Catalysis Letters. 152:489-502
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- In order to improve the current environmental pollution caused by discarded pesticide packages in rural areas, and raise awareness of agricultural ecological environmental protection. Rare earth ions (RE3+ = Ce3+, Sm3+, Pr3+, La3+) doped titanium dioxide (TiO2) catalysts were prepared by sol-hydrothermal method and characterized by XRD, SEM, TEM, XPS, BET, UV–vis DRS, PL, EPR, and density functional theory (DFT) calculations. The characterization results showed that the doped rare earth ions replace Ti4+ into the titania lattice. The activity of the RE3+-doped TiO2 photocatalyst was evaluated by degrading methyl orange (MO) and mixed pesticides (also containing pirimicarb, fenthiophos, triadimefon and deltamethrin) under ultraviolet light. Compared with pure TiO2, RE3+-doped TiO2 has significantly improved photocatalytic activity for the degradation of MO and carbamate pesticides. The degradation rate of Sm-TiO2 sample to degrade MO reached 100% within 60 min, and the degradation rate of degrading aphicarb, fenthion, triadimefon and deltamethrin reached more than 90% within 180 min. Sm-TiO2 is the best catalyst. This can be attributed to a synergistic effect of the doping of Sm3+ introduces impurity energy levels and a large number of oxygen vacancies (OVs), which can more effectively capture photogenerated electrons and reduce the recombination rate of photogenerated electrons-holes. In this study, the sol-hydrothermal method was used to develop a high-efficiency catalyst for simultaneous photocatalytic degradation of various organic pollutants in aqueous solutions.
- Subjects :
- Aqueous solution
010405 organic chemistry
Chemistry
Inorganic chemistry
Environmental pollution
General Chemistry
010402 general chemistry
01 natural sciences
Catalysis
0104 chemical sciences
chemistry.chemical_compound
Titanium dioxide
Photocatalysis
Ultraviolet light
Methyl orange
Hydrothermal synthesis
Subjects
Details
- ISSN :
- 1572879X and 1011372X
- Volume :
- 152
- Database :
- OpenAIRE
- Journal :
- Catalysis Letters
- Accession number :
- edsair.doi...........b626a1737d4dd0c930582f546be33c2e
- Full Text :
- https://doi.org/10.1007/s10562-021-03634-4