Solvothermal syntheses of semiconductor photocatalysts of ultra-high activities
Solvothermal syntheses of semiconductor photocatalysts of ultra-high activities
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DOI：
10.1016/s0920-5861(03)00272-4
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发表时间：
2003-09
期刊：
影响因子：
5.3
通讯作者：
H. Kominami;J. Kato;Shin-ya Murakami;Y. Ishii;M. Kohno;Kei-ichi Yabutani;Takuhei Yamamoto;Y. Kera;M. Inoue;T. Inui;B. Ohtani
中科院分区：
文献类型：
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作者：
H. Kominami;J. Kato;Shin-ya Murakami;Y. Ishii;M. Kohno;Kei-ichi Yabutani;Takuhei Yamamoto;Y. Kera;M. Inoue;T. Inui;B. Ohtani
将溶解于2-丁醇中的丁氧钛（IV）在573K的自压下进行热处理（醇热处理），得到微晶锐钛型氧化钛（TiO2）。氧化钛（2,4-戊二酮-O，O '） （TiO(acac)2）在乙酸钠和少量水的存在下，在573K温度下在乙二醇（EG）中热处理，得到微晶钙钛矿型TiO2。以钨酸钠为原料，用质子型树脂离子交换法制备了H2WO4水溶液，在523和573K温度下，采用水热处理（HTT）法制备了高结晶度的单斜晶结构氧化钨（WO3）粉末。在不同温度下煅烧锐钛矿和板钛矿tio2产物，用于曝气条件下水溶液中乙酸的光催化矿化和脱氧条件下2-丙醇的光催化脱氢。几乎所有锐钛矿型tio2样品在两种反应中的活性都比具有代表性的活性光催化剂德固赛P-25和石原ST-01的活性高2倍以上。在973K下煅烧得到结晶度提高、表面积充足的板岩样品，其析氢速率几乎等于P-25。采用不同物理性质的HTT wo3粉末作为光催化剂，催化硫酸银水溶液中氧的析出。高结晶度的wo3粉末，如在573K下合成的ie - http - wo3，其o2产率远高于市售wo3样品。
Thermal treatment of titanium(IV) butoxide dissolved in 2-butanol at 573K under autogenous pressure (alcohothermal treatment) yielded microcrystalline anatase-type titanium(IV) oxide (TiO2). Thermal treatment of oxobis(2,4-pentanedionato-O,O′)titanium (TiO(acac)2) in ethylene glycol (EG) in the presence of sodium acetate and a small amount of water at 573K yielded microcrystalline brookite-type TiO2. Tungsten(VI) oxide (WO3) powders of monoclinic crystal structure with high crystallinity were synthesized by hydrothermal treatment (HTT), at 523 or 573K, of aqueous tungstic acid (H2WO4) solutions prepared from sodium tungstate by ion-exchange (IE) with a proton-type resin. Anatase and brookite TiO2products were calcined at various temperatures and then used for photocatalytic mineralization of acetic acid in aqueous solutions under aerated conditions and dehydrogenation of 2-propanol under deaerated conditions. Almost all the anatase-type TiO2samples showed the activities more than twice higher than those of representative active photocatalysts, Degussa P-25 and Ishihara ST-01 in both reactions. A brookite sample with improved crystallinity and sufficient surface area obtained by calcination at 973K exhibited the hydrogen evolution rate almost equal to P-25. HTT WO3powders with various physical properties were used as photocatalyst for evolution of oxygen (O2) from an aqueous silver sulfate solution. WO3powder of high crystallinity, e.g., IE-HTT-WO3synthesized at 573K, gave much higher O2yield than commercially available WO3samples.