Электронный каталог

Статья

Kuspanov, Z.
Efficient Photocatalytic Degradation of Methylene Blue Via Synergistic Dual co-Catalyst on SrTiO&sub(3)@Al Under Visible Light: Experimental and DFT Study / Z.Kuspanov, N.Matsko, A.Issadykov, [a.o.] // Journal of the Taiwan Institute of Chemical Engineers [Electronic resource]. – 2024. – Vol. 165. – P. 105806. – URL: https://doi.org/10.1016/j.jtice.2024.105806. – Bibliogr.: 86.

Background: Photocatalytic oxidation is a green method for water purification. However, the operation of traditional photocatalysts depends on exposure to UV radiation, which only forms a small portion of the spectrum comprising sunlight. The expansion of photocatalyst absorption to the visible range of light could greatly improve the efficiency and economic viability of the process. Methods : The photocatalyst was prepared by first synthesising SrTiO&sub(3) nanoparticles by chemical precipitation followed by calcination. Then, SrTiO&sub(3) was doped with aluminium using a flux method with Al&sub(2)O&sub(3) and SrCl&sub(2) at 1150 °C. Finally, the dual co-catalysts, Rh/Cr&sub(2)O&sub(3) and CoOOH, were photodeposited onto SrTiO&sub(3)@Al via sequential irradiation. Significant findings : The Rh/Cr&sub(2)O&sub(3)/SrTiO&sub(3)@Al/CoOOH nanocomposite degraded 87% of methylene blue (MB) (10 mg/L) under visible light in 1 h, a 3.3-fold improvement over pure SrTiO&sub(3) and 2.1-fold over a similar commercial composite. This enhancement is due to efficient charge separation resulting from Al doping and improved carrier transport as a result of the anisotropic deposition of the co-catalysts. Optimisation showed that 20 mg of photocatalyst in 50 mL of MB solution (5 mg/L) degraded 100% thereof within 45 min. DFT calculations showed uneven electron distribution in SrTiO&sub(3)′s conduction band and structural changes with Al doping, further enhancing photocatalytic activity.



Спец.(статьи,препринты) = С 44 г - Физико-химические методы анализа элементов. Анализ с помощью ядерных методов
Спец.(статьи,препринты) = 28.08 - Экология$
Спец.(статьи,препринты) = С 33 а - Нанофизика. Нанотехнология$
ОИЯИ = ОИЯИ (JINR)2024
Бюллетени = 4/025