Anti-oxidant/pro-oxidant activity of ascorbic acid Effect in the degradation of Acid Orange 7 with H2O2 catalyzed by transition metal ions

被引：0

作者：

Piumetti, Marco ^{[1
,2
]}

Freyria, Francesca S. ^{[1
,2
,3
]}

Armandi, Marco ^{[1
,2
]}

Saracco, Guido ^{[1
,2
]}

Garrone, Edoardo ^{[1
,2
]}

Bonelli, Barbara ^{[1
,2
]}

机构：

[1] Politecn Torino, Dept Appl Sci & Technol, I-10129 Turin, Italy

[2] Politecn Torino, INSTM Unit Torino Politecn, I-10129 Turin, Italy

[3] MIT, Dept Chem, Cambridge, MA 02139 USA

来源：

CHIMICA OGGI-CHEMISTRY TODAY | 2015年 / 33卷 / 03期

关键词：

Heterogeneous catalysis; Fenton mechanism; liquid phase oxidation; ascorbic acid; titania; azo-dyes; PHOTOCATALYTIC DEGRADATION; AZO-DYE; OXIDATION; BENZENE; PH; VANADIUM(V); REDUCTION;

D O I：

暂无

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

The effect of incubating mesoporous TiO2, with or without Fe3+ or V5+, in ascorbic acid (H(2)A) solutions before the catalytic oxidation in the dark with H2O2 of Acid Orange 7 was studied; the results were compared to the same reaction without H(2)A pretreatment. With a short incubation time, H(2)A irreversibly adsorbs on the TiO2 surface, depleting the related activity, so that pure TiO2 becomes inactive, and reduces surface ions to Fe2+ and V3+ species, so that the pristine reaction mechanisms (slow Fe3+-catalysed Fenton and stoichiometric oxidation by V5+ to V4+) are replaced by fast Fenton reactions. With long incubation times, H(2)A reacts with dissolved O-2 to form 2,3-diketo-L-gulono-delta-lactone and has a detrimental effect on the catalytic activity.

引用

页码：40 / 45

页数：6

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