期刊
ACS APPLIED MATERIALS & INTERFACES
卷 6, 期 19, 页码 16653-16660出版社
AMER CHEMICAL SOC
DOI: 10.1021/am5034236
关键词
porous TiO2 ceramics; floating photocatalyst; room-temperature freeze-drying; photocatalysis; pesticide micropolluted water
资金
- National Natural Science Foundation of China [21376065, 81302511, 21106035, 21101060]
- Natural Science Foundation of Heilongjiang Province [QC2012C001, QC2013C079, QC2012C046]
- Program for New Century Excellent Talents in University of Heilongjiang Province [1253-NCET-020]
- Scientific Research Fund of Heilongjiang Provincial Education Department [12521226]
- Special Fund of Technological Innovation Talents in Harbin City [2013RFQXJ002]
- Heilongjiang University Excellent Youth Foundation [JCL201102]
In this research, hierarchical porous TiO2 ceramics were successfully synthesized through a camphene-based freeze-drying route. The well-dispersed TiO2 slurries were first frozen and dried at room temperature, followed by high-temperature sintering. The ceramics were analyzed by X-ray diffraction, Raman spectroscopy, scanning electron microscopy, and transmission electron microscopy. Results indicated that the obtained TiO2 ceramics could inhibit undesirable anatase-to-rutile phase transformation and grain growth even at temperatures as high as 800 degrees C. In this experiment, optimal compressive strength and porosity of the TiO2 ceramics were produced with the initial TiO2 slurry content of similar to 15 wt %. The resultant TiO2 ceramics performed excellently in the photodegradation of atrazine and thiobencarb, and the total organic carbon removal efficiency was up to 95.7% and 96.7%, respectively. More importantly, the TiO2 ceramics were easily recyclable. No obvious changes of the photocatalytic performance were observed after six cycles. Furthermore, the ceramics also effectively degraded other pesticides such as dimethoate, lindane, dipterex, malathion, and bentazone. These hierarchical porous TiO2 ceramics have potential applications in environmental cleanup.
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