A new route for preparation of TiO2-mounted activated carbon
A new route for preparation of TiO2-mounted activated carbon
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DOI：
10.1016/s0926-3373(03)00214-5
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发表时间：
2003-10
影响因子：
22.1
通讯作者：
B. Tryba;A. Morawski;M. Inagaki
中科院分区：
文献类型：
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作者：
B. Tryba;A. Morawski;M. Inagaki
以正钛酸四异丙基为原料，在聚乙烯醇丁醛（PVB）表面沉淀tio2，在二氧化碳流下，在700 ~ 900℃的不同温度下炭化，制备了tio2负载活性炭。通过紫外辐射下苯酚在水溶液中的分解，考察了所制备的TiO2/碳复合材料的光活性。在没有紫外线照射的情况下，这些催化剂对苯酚的吸附很小（0-4%）。对于含有2.5%碳的锐钛矿单相样品，加热到700°C，在紫外线照射12h后，苯酚几乎完全去除。热处理过程中碳抑制锐钛矿向金红石的转变。采用较高的热处理温度和选择合适的碳前驱体进行碳化，可以改善tio2催化剂的晶体结构。制备的二氧化钛可以很容易地从溶液中分离出来，并且可以在保持其光活性的情况下重复使用。
TiO2-mounted activated carbon was prepared by the precipitation of TiO2from tetraisopropyl orthotitanate on the surface of poly(vinyl butyral) (PVB) and subsequent carbonization to different final temperatures from 700 to 900°C under a flow of carbon dioxide. Photoactivity of the prepared TiO2/carbon composities was checked by decomposition of phenol in aqueous solution under UV irradiation. Adsorption of phenol on these catalysts was found to be very small (0–4%) without UV irradiation. Almost complete removal of phenol after 12h under UV irradiation was observed for the sample heated to 700°C that consisted of a single phase of anatase with 2.5% carbon. Carbon suppressed transformation of anatase onto rutile during heat treatment process. It has some benefits such as improving the crystalline structure of TiO2catalyst by using higher temperature of heat treatment and selection of the proper carbon precursor for carbonisation. Prepared TiO2mounted on carbon could be easily separated from the solution and it can be used repeatedly for phenol removal with preservation of its photoactivity.