共 67 条
Ceria doping boosts methylene blue photodegradation in titania nanostructures
被引:35
作者:
Alberoni, Chiara
[1
]
Barroso-Martin, Isabel
[2
]
Infantes-Molina, Antonia
[2
]
Rodriguez-Castellon, Enrique
[2
]
Talon, Aldo
[1
]
Zhao, Haiguang
[3
,4
]
You, Shujie
[5
]
Vomiero, Alberto
[1
,5
]
Moretti, Elisa
[1
]
机构:
[1] Ca Foscari Univ Venice, Dept Mol Sci & Nanosyst, Via Torino 155, I-30172 Venice, Italy
[2] Univ Malaga, CSIC, Unidad Asociada ICP, Dept Quim Inorgan Cristal & Mineral,Fac Ciencias, Campus Teatinos, Malaga 29071, Spain
[3] Qingdao Univ, Coll Phys, 308 Ningxia Rd, Qingdao 266071, Peoples R China
[4] State Key Lab Biofibers & Ecotext, 308 Ningxia Rd, Qingdao 266071, Peoples R China
[5] Lulea Univ Technol, Dept Engn Sci & Math, Div Mat Sci, S-97187 Lulea, Sweden
关键词:
CARBON-MONOXIDE OXIDATION;
PHOTOCATALYTIC ACTIVITY;
WASTE-WATER;
CATALYSTS;
DEGRADATION;
TEMPERATURE;
CEO2;
NANOCOMPOSITES;
FABRICATION;
REDUCTION;
D O I:
10.1039/d1qm00068c
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
Ceria-doped titania photocatalysts (ceria loading 0.25-5.0 wt%) were synthesized by hydrothermal methods for water remediation. Nanotubes (CeTNTx) and nanoparticles (CeTNPx) were obtained. Ceria doping was applied to tune the electronic properties of nanostructured titania, boosting its photocatalytic activity. CeTNT nanostructures contained anatase as the only titania phase, whereas the CeTNP series consisted of both anatase and rutile polymorphs. The Ce addition induced a decrease in the energy gap, allowing enhancement of visible light harvesting. The photodegradation of methylene blue, MB, in aqueous solution was chosen to study the influence of the morphology and the ceria loading on the photocatalytic response, under UV and solar light. Both CeO2-TiO2 nanoparticles and nanotubes were found to be very active under UV light. The highest MB degradation rates were obtained for the 0.25 wt% CeO2 doping, for both nanotubes and nanoparticles (0.123 and 0.146 min(-1), respectively), able to photodegrade completely the dye after 120 min. The two samples are stable after a 3-cycle reusability test. The photo-response under simulated solar light confirmed that doping titania with ceria allows harvesting visible light absorption, enhancing its photoactivity. A maximum efficiency of 85% under simulated sunlight at a degradation rate of 0.054 min(-1) was obtained. Transient photoluminescence confirmed that MB acts as a charge scavenger for the composite system. These results pointed out ceria-doped titania nanostructures as a promising class of photocatalysts for the degradation of dyes and other hazardous organic compounds in wastewater.
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页码:4138 / 4152
页数:15
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