Degradation of Carbamazepine by Photo(electro)catalysis on Nanostructured TiO2 Meshes: Transformation Products and Reaction Pathways

被引：50

作者：

Franz, Silvia ^{[1
]}

Falletta, Ermelinda ^{[2
]}

Arab, Hamed ^{[1
]}

Murgolo, Sapia ^{[3
]}

Bestetti, Massimiliano ^{[1
]}

Mascolo, Giuseppe ^{[3
]}

机构：

[1] Politecn Milan, Dept Chem Mat & Chem Engn G Natta, I-20133 Milan, Italy

[2] Univ Milan, Dept Chem, I-20133 Milan, Italy

[3] CNR, Ist Ric Acque, Via F De Blasio 5, I-70132 Bari, Italy

来源：

CATALYSTS | 2020年 / 10卷 / 02期

关键词：

immobilized catalyst; titanium dioxide; photoelectrocatalysis; heterogeneous photocatalysis; compounds of emerging concern; transformation products; PLASMA ELECTROLYTIC OXIDATION; MUNICIPAL WASTE-WATER; PHOTOCATALYTIC DEGRADATION; PHOTOELECTROCATALYTIC DEGRADATION; TREATMENT PLANTS; NANOTUBE ARRAYS; REMOVAL; IDENTIFICATION; CONTAMINANTS; EFFICIENCY;

D O I：

10.3390/catal10020169

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Carbamazepine (CBZ) is a pharmaceutical compound recalcitrant to conventional wastewater treatment plants and widely detected in wastewater bodies. In the present study, advanced oxidation processes for carbamazepine removal are investigated, with particular regard to the degradation pathways of carbamazepine by photoelectrocatalysis and conventional photocatalysis. Photoelectrocatalysis was carried out onto TiO2 meshes obtained by Plasma Electrolytic Oxidation, a well-known technique in the field of industrial surface treatments, in view of an easy scale-up of the process. By photoelectrocatalysis, 99% of carbamazepine was removed in 55 min while only 65% removal was achieved by photolysis. The investigation of the transformation products (TPs) was carried out by means of UPLC-QTOF/MS/MS. Several new TPs were identified and accordingly reaction pathways were proposed. Above 80 min the transformation products disappear, probably forming organic acids of low-molecular weight as final degradation products. The results demonstrated that photoelectrocatalysis onto TiO2 meshes obtained by plasma electrolytic oxidation is a useful alternative to common advanced oxidation processes as wastewater tertiary treatment aimed at removing compounds of emerging concern.

引用

页数：20

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