期刊
JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 282, 期 -, 页码 -出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2020.111602
关键词
Sol-gel method; Arsenite photocatalytic oxidation; Molybdenum blue method; WO3/TiO2 semiconductors
资金
- CONACyT [590050, CB-2015-01 256410]
- Materials for Alternative Energies Project. SEP-Profides 2018, UANL-UAM
WO3/TiO2 semiconductors synthesized through sol-gel method can efficiently photocatalyze the oxidation of arsenite (As(III)) to arsenate (As(V)), with 3%WO3/TiO2(TW3) showing the highest catalytic efficiency.
Photocatalytic oxidation of arsenite (As(III)) to arsenate (As(V)) was studied in aqueous solution using a series of WO3/TiO2 semiconductors readily synthesized through sol-gel method with WO3 content in the range of 1-5 wt %. The resulting materials showed enhanced photocatalytic activity towards As(III) photo-oxidation compared to their individual counterparts under UV radiation. The amount of As(III) and As(V) species in the irradiated solution was determined using the molybdenum blue method. The efficiency of photoinduced carriers separation was further affirmed by electrical impedance spectroscopy (EIS) and photocurrent tests. The maximum catalytic efficiency was observed when the binary oxide 3%WO3/TiO2 (TW3) was used, reaching a 99% conversion of As (III) to As(V) within the first 25 min under UV irradiation. The enhanced photocatalytic performance of the heterostructures could be explained as consequent to an improved charge separation due to the migration of photoproduced holes in TW3 photocatalyst. Based on the electric band structure of WO3 and TiO2, a reasonable mechanism for the photo-oxidation of As(III) over TW3 novel catalyst has been proposed.
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