• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Formation of 3D interconnectively macro/mesoporous TiO2 sponges through gelation of lotus root starch toward CO2 photoreduction into hydrocarbon fuels
【24h】

Formation of 3D interconnectively macro/mesoporous TiO2 sponges through gelation of lotus root starch toward CO2 photoreduction into hydrocarbon fuels

机译：通过lotus粉朝CO2光还原成烃类燃料的胶凝形成3D相互关联的大/中观TiO2海绵

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

A particular TiO2 sponge, consisting of macroporous framework with interconnected mesoporous channels, was fabricated through a co-gelation of lotus root starch (LRS) with TiO2 precursor, followed by lyophilization and subsequent calcination. This strategy advantageously inherits both the traditional hard-templating technique for well-defined 3D predesigned macroporous architecture and soft-templating techniques for interpore connectivity. The resulting TiO2 sponge exhibits about a 2.60 fold improvement in CO2 photoconversion rate (CH4: 5.13 ppm h(-1)) compared to the referred TiO2 (1.97 ppm h(-1)) formed in the absence of the LRS. The generation rate of CH4 over macro/mesoporous TiO2 sponge could be further significantly enhanced to 11.95 ppm h(-1) by co-loading Pt (0.9 wt%) and Cu (1.7 wt%) as co-catalysts by improvement of the separations of the photogenerated electron-hole pairs. The higher photocatalytic activity of the macro/mesoporous TiO2 sponge can be attributed to the following three reasons: (1) macroporous architecture favors gas diffusion of the reactants and the products; (2) macroporous architecture also promotes the multiple-reflection effect occurring inside the interior macrocavities, which enables trapping (or harvest) the incident light in the photocatalyst for a longer duration and bring forth more opportunities for light absorption; and (3) the mesoporous structure enhances gas capture/adsorption of the reactants and provides more reaction sites.
机译：通过将lotus粉（LRS）与TiO2前体共凝胶化，然后冻干并随后煅烧，制造出一种特殊的TiO2海绵，该海绵由具有相互连通的中孔通道的大孔骨架组成。该策略有利地继承了用于定义明确的3D预设计大孔结构的传统硬模板技术和用于孔间连接的软模板技术。与在不使用LRS的情况下形成的TiO2（1.97 ppm h（-1））相比，所得的TiO2海绵在CO2光转化率（CH4：5.13 ppm h（-1））上显示出约2.60倍的改善。通过改善分离度，通过共担载Pt（0.9 wt％）和Cu（1.7 wt％）作为助催化剂，可以将大/中值TiO2海绵上CH4的生成速率进一步提高至11.95 ppm h（-1）。光生电子-空穴对的数量。大/中孔TiO2海绵的较高的光催化活性可以归因于以下三个原因：（1）大孔结构有利于反应物和产物的气体扩散; （2）大孔结构还促进了内部大腔内部发生的多重反射作用，从而使入射光在光催化剂中的捕获时间更长（或捕获），并带来了更多的光吸收机会; （3）中孔结构增强了反应物的气体捕获/吸附并提供了更多的反应位点。

著录项

相似文献

  • 外文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号