TY - JOUR

T1 - Uranyl-modified TiO 2 for complete photocatalytic oxidation of volatile organic compounds under UV and visible light

AU - Selishchev, Dmitry S.

AU - Filippov, Tihon N.

AU - Lyulyukin, Mikhail N.

AU - Kozlov, Denis V.

N1 - Funding Information: This work was supported by Ministry of Science and Higher Education of the Russian Federation (project АААА-А17-117041710087-3 ). Publisher Copyright: © 2019 Elsevier B.V.

PY - 2019/8/15

Y1 - 2019/8/15

N2 - Three commercially available TiO 2 powder photocatalysts and additional one synthesized in laboratory via the modification of anatase TiO 2 with uranyl nitrate (5 wt%) have been studied in the complete oxidation of several VOCs under UV (367 nm) and visible (450 nm) light. The kinetic curves for VOC removal, intermediate formation, and final product accumulation are presented in the paper and discussed in detail. The TiO 2 modification with uranyl ions (UO 2 2+ ) provides the ability for photocatalyst to absorb visible light with wavelength up to 500 nm. The photocatalytic activity of the uranyl-modified TiO 2 under visible light was up to 56 times higher than the activity of one of the best visible light sensitive commercial photocatalysts, KRONOClean® 7000 from Kronos Worldwide Inc. The complete oxidation of all the tested pollutants occurred over UO 2 2+ /TiO 2 both under UV and visible light. The formation of gaseous intermediates was observed for certain types of VOC, but the intermediates were further completely oxidized to carbon oxides and water under long-term irradiation. The kinetic regularities of PCO process under visible light were similar to the process under UV except somewhat prolonged kinetics due to lower photonic efficiency of light utilization in the visible spectral range.

AB - Three commercially available TiO 2 powder photocatalysts and additional one synthesized in laboratory via the modification of anatase TiO 2 with uranyl nitrate (5 wt%) have been studied in the complete oxidation of several VOCs under UV (367 nm) and visible (450 nm) light. The kinetic curves for VOC removal, intermediate formation, and final product accumulation are presented in the paper and discussed in detail. The TiO 2 modification with uranyl ions (UO 2 2+ ) provides the ability for photocatalyst to absorb visible light with wavelength up to 500 nm. The photocatalytic activity of the uranyl-modified TiO 2 under visible light was up to 56 times higher than the activity of one of the best visible light sensitive commercial photocatalysts, KRONOClean® 7000 from Kronos Worldwide Inc. The complete oxidation of all the tested pollutants occurred over UO 2 2+ /TiO 2 both under UV and visible light. The formation of gaseous intermediates was observed for certain types of VOC, but the intermediates were further completely oxidized to carbon oxides and water under long-term irradiation. The kinetic regularities of PCO process under visible light were similar to the process under UV except somewhat prolonged kinetics due to lower photonic efficiency of light utilization in the visible spectral range.

KW - TiO photocatalysis

KW - Uranyl ion (UO )

KW - UV

KW - Visible light

KW - VOC oxidation

KW - EXCITED-STATE

KW - FT-IR

KW - ION

KW - MODIFIED TITANIA

KW - AQUEOUS-SOLUTION

KW - TiO2 photocatalysis

KW - ANCHORED MCM-41

KW - DEGRADATION

KW - PHOTOCHEMISTRY

KW - MODIFIED OXIDES

KW - Uranyl ion (UO22+)

KW - PHOTOOXIDATION

UR - http://www.scopus.com/inward/record.url?scp=85063934102&partnerID=8YFLogxK

U2 - 10.1016/j.cej.2019.03.280

DO - 10.1016/j.cej.2019.03.280

M3 - Article

AN - SCOPUS:85063934102

VL - 370

SP - 1440

EP - 1449

JO - Chemical Engineering Journal

JF - Chemical Engineering Journal

SN - 1385-8947

ER -