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Photodegradation comparison for methyl orange by TiO 2, H 2 O 2 and KIO 4

Photodegradation comparison for methyl orange by TiO 2, H 2 O 2 and KIO 4

Yu Zhiyong, Qiu Ruiying, Yang Runbo, Wang Zhiyin, Li Huanrong

Environ Technol. 2020 Feb;41(5):547-555.

PMID: 30059265

Abstract:

The photodegradation of methyl orange in water by the catalyst TiO2 or the oxidants (H2O2, KIO4) or their combination (TiO2 + H2O2, TiO2 + KIO4) under UV light illumination is studied. During the above process, as far as the photodiscoloration degree of methyl orange is concerned, the effect sequence is KIO4 + TiO2 >> KIO4 > TiO2 + H2O2 > TiO2 > H2O2; as far as the photomineralization degree of methyl orange is concerned, the effect sequence is TiO2 ≈ TiO2 + H2O2 > H2O2 > KIO4 + TiO2 >> KIO4; as for the catalysis of TiO2, h+ plays more important role than HO·, the inorganic ions ([Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text]) are generated, especially for the amount of [Formula: see text]. Active HO· is generated, we can measure HO· by terephthalic acid (TA) indirectly: TA reacts with HO· to form highly fluorescent product, namely 2-hydroxyterephthalic acid (TAOH).

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP636942	2-Hydroxyterephthalic acid		636-94-2	Price

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