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Photosensitized Oxidation of Emerging Organic Pollutants by Tetrakis C60 Aminofullerene-Derivatized Silica under Visible Light Irradiation
详细信息
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作者:
Jaesang
Lee
;
Seokwon Hong
;
Yuri Mackeyev
;
Changha
Lee
;
Eunhyea Chung
;
Lon J. Wilson
;
Jae-Hong Kim
;
Pedro J. J. Alvarez
刊名:Environmental Science & Technology
出版年:2011
出版时间:December 15, 2011
年:2011
卷:45
期:24
页码:10598-10604
全文大小:985K
年卷期:v.45,no.24(December 15, 2011)
ISSN:1520-5851
文摘
We recently reported that C
60
aminofullerenes immobilized on silica support (aminoC
60
/silica) efficiently produce singlet oxygen (
1
O
2
) and inactivate virus and bacteria under visible light irradiation.
(1) We herein evaluate this new photocatalyst for oxidative degradation of 11 emerging organic contaminants, including pharmaceuticals such as acetaminophen, carbamazepine, cimetidine, propranolol, ranitidine, sulfisoxazole, and trimethoprim, and endocrine disruptors such as bisphenol A and pentachlorophenol. Tetrakis aminoC
60
/silica degraded pharmaceuticals under visible light irradiation faster than common semiconductor photocatalysts such as platinized WO
3
and carbon-doped TiO
2
. Furthermore, aminoC
60
/silica exhibited high target-specificity without significant interference by natural organic matter. AminoC
60
/silica was more efficient than unsupported (water-suspended) C
60
aminofullerene. This was attributed to kinetically enhanced
1
O
2
production after immobilization, which reduces agglomeration of the photocatalyst, and to adsorption of pharmaceuticals onto the silica support, which increases exposure to
1
O
2
near photocatalytic sites. Removal efficiency increased with pH for contaminants with a phenolic moiety, such as bisphenol A and acetaminophen, because the electron-rich phenolates that form at alkaline pH are more vulnerable to singlet oxygenation.
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