Bi-functional photocatalytic heterostructures combining titania thin films with carbon quantum dots (C-QDs/TiO2) for effective elimination of water pollutants

被引：22

作者：

Falara, Pinelopi P. ^{[1
,2
]}

Ibrahim, Islam ^{[2
,3
]}

Zourou, Adamantia ^{[1
]}

Sygellou, Labrini ^{[4
]}

Sanchez, David Emanuel ^{[5
,6
]}

Romanos, George Em. ^{[2
]}

Givalou, Lida ^{[1
,2
]}

Antoniadou, Maria ^{[2
,7
]}

Arfanis, Michalis K. ^{[2
]}

Han, Changseok ^{[8
,9
]}

Terrones, Mauricio ^{[5
,6
,10
,11
,12
]}

Kordatos, Konstantinos V. ^{[1
]}

机构：

[1] Natl Tech Univ Athens, Sch Chem Engn, 9 Iroon Polytech St, Athens 15780, Greece

[2] Natl Ctr Sci Res Demokritos, Inst Nanosci & Nanotechnol, Athens 15341, Greece

[3] Al Azhar Univ, Fac Sci, Dept Chem, Nasr City 11884, Cairo, Egypt

[4] Fdn Res & Technol Hellas, Inst Chem Engn & High Temp Chem Proc FORTH ICE HT, POB 1414, GR-26504 Patras, Greece

[5] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[6] Penn State Univ, Ctr Dimens & Layered Mat 2, University Pk, PA 16802 USA

[7] Univ Western Macedonia, Dept Chem Engn, ZEP, Kozani 50100, Greece

[8] INHA Univ, Dept Environm Engn, 100 Inha Ro, Incheon 22212, South Korea

[9] INHA Univ, Program Environm & Polymer Engn, Grad Sch, 100 Inha Ro, Incheon 22212, South Korea

[10] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

[11] Penn State Univ, Dept Chem, University Pk, PA 16802 USA

[12] Penn State Univ, Mat Res Inst, University Pk, PA 16802 USA

来源：

ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH | 2023年 / 30卷 / 60期

基金：

新加坡国家研究基金会;

关键词：

Synthesis; Carbon quantum dots; C-QDs; TiO2; composite; Organic-inorganic pollutants; Photocatalytic degradation; Reusability experiments; MODIFICATION STRATEGIES; HYDROTHERMAL SYNTHESIS; TIO2; DEGRADATION; PHOTODEGRADATION; ENHANCEMENT; NANOCRYSTALS; COMPOSITES; ADSORPTION; REMOVAL;

D O I：

10.1007/s11356-023-27285-7

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

In this study, carbon quantum dots (C-QDs), prepared via hydrothermal-microwave procedures, were successfully combined with nanostructured titania (TiO2). The photocatalytic oxidation/reduction activity of the C-QDs/TiO2 composite films was evaluated in the decomposition of organic-inorganic contaminants from aqueous solutions under UV illumination. Physicochemical characterizations were applied to investigate the crystal structure of the carbon quantum dots and the composites. It was found that the prepared C-QDs/TiO2 composites had great contribution to the photocatalytic reduction of hexavalent chromium (Cr+6) species and 4-Nitrophenol (PNP) as well as to the photocatalytic oxidation of methylene blue (MB) and Rhodamine B (RhB) dyes. The mechanism of the photocatalytic reaction was studied with trapping experiments, revealing that the electron (e(-)) radical species were powerfully supported for the photocatalytic reduction of Cr+6 and PNP and the holes (h(+)) are the main active species for the photocatalytic oxidation reactions.

引用

页码：124976 / 124991

页数：16

共 76 条

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