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.
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页码：40 / 45
页数：6
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