液相沉积法制备光催化活性TiO2薄膜和纳米粉体 |
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引用本文: | 赵文宽,周磊,刘昌,胡翎,方佑龄,木内正人. 液相沉积法制备光催化活性TiO2薄膜和纳米粉体[J]. 化学学报, 2003, 61(5): 699-704 |
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作者姓名: | 赵文宽 周磊 刘昌 胡翎 方佑龄 木内正人 |
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作者单位: | [1]武汉大学化学系武汉430072 [2]日本产业技术综合研究所大阪563-8577日本 |
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基金项目: | 国家自然科学基金(No.2007303)资助项目. |
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摘 要: | 采用液相沉积法,在35℃通过向六氟钛酸铵水溶液中添加硼酸和结晶诱导剂锐 铁矿型TiO2纳米晶,沉积出具有光催化活性的Ti02薄膜和纳米粉体.用XRD,AFM, 阶梯仪,UV-vis,BET法对Ti02薄膜和粉体的沉积条件、结构、厚度和性能进行了测 定和表征,并用亚甲兰的降解,评价了TiO2薄膜和纳米粉体的光催化活性.结果表 明,当反应物六氟钛酸铵与硼酸的摩尔比为1:2—1:4时,沉积的粉体和薄膜含有 锐钛矿相Ti02;经300℃热处理的Ti02薄膜和纳米粉体具有最高的光催化活性,它 的光催化活性是未经热处理前的5倍.本文还解释了经300℃热处理的薄膜和纳米粉 体具有最高光催化活性的原因.
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关 键 词: | 沉积 光催化 氧化钛 薄膜 亚甲兰 六氟钛酸铵 硼酸 |
修稿时间: | 2002-08-16 |
Photocatalytic Activity of TiO_2 Thin Films and Nano-powders Prepared by Liquid Phase Deposition (LPD) |
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Affiliation: | Department of Chemistry, Wuhan University;Department of Physics, Wuhan University;National Institute of Advanced Industrial Science and Technology |
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Abstract: | Titanium oxide thin films and nano-powders with photocatalytic activities were prepared via liquid-phase deposition (LPD) method by adding H3BO3 into an (NH4) 2TiF6 solution supersaturated with anatase nano-crystaUine TiO2 at 35 ℃. The effects of the deposition conditions on the structure, surface morphology, thickness and performance of the deposited TiO2 thin films and powder were studied by XRD, AFM, step profilometer, UV-Vis and BET methods. Photocatalytic activity of the TiO2 thin films and powder was evaluated by degradation of methylene blue. The results indicate, when molar ratio of TiF2-6-/H3BO3 was set at 1:2 ~ 1:4, anatase TiO2 was found in the prepared powder and the deposited thin films. Degradation of methylene blue reached its maximum for both thin films and powder calcined at 300 ℃, which was 5 times higher than that deposited at 35℃. The mechanism of the appearance of the strongest photocatalytic activity at 300 X, was also discussed. |
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Keywords: | SEDIMENTATION PHOTOCATALYSIS TITANIUM OXIDE THIN FILMS METHYLENUM CAERULEUM (NH4) 2TiF6 BORIC ACID |
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