Visible light responsive photocatalytic hydrogen production over composites of anodized TiO2 nanotube array and graphitic carbon nitride measured with a gas circulating reactor
Visible light responsive photocatalytic hydrogen production over composites of anodized TiO2 nanotube array and graphitic carbon nitride measured with a gas circulating reactor
复制标题
DOI：
10.35848/1347-4065/ac23ef
复制
发表时间：
2021-09
影响因子：
1.5
通讯作者：
Hikaru Masegi;Naoyuki Doi;Shota Yoneyama;K. Noda
中科院分区：
文献类型：
--
作者：
Hikaru Masegi;Naoyuki Doi;Shota Yoneyama;K. Noda
采用自制的气循环反应器系统，研究了电化学阳极氧化纳米钛（TNT）阵列和石墨化碳（g-C3N4）纳米颗粒复合材料的气相光催化性能。以三聚氰胺和尿素为前驱体，采用易热聚合法制备了g-C3N4纳米颗粒。在可见光（VIS）照射下（370 ~ 800 nm）， g-C3N4在TNT阵列上的存在明显提高了水/甲醇混合物气相光催化分解制氢的效率。用对苯二甲酸作为自由基诱捕剂，通过光致发光的方法测定了TNT/g-C3N4复合材料在水光氧化作用下羟基自由基的生成。这些结果来源于TNT和g-C3N4的协同作用，可以归因于TNT/g-C3N4界面上光生空穴-电子分离的增强，这表明g-C3N4是一种无金属敏化剂，可以在阳极氧化的TNT中实现VIS响应光催化，即使是气相反应。
Gas phase photocatalysis over composites of electrochemically anodized titania nanotube (TNT) arrays and graphitic carbon nitride (g-C3N4) nanoparticles were examined with a home-made, gas-circulating reactor system. g-C3N4 nanoparticles were deposited onto anodized TNT surfaces by facile thermal polymerization using melamine and urea as precursors. The existence of g-C3N4 on TNT arrays clearly improved hydrogen production from gas phase photocatalytic decomposition of water/methanol mixture under visible light (VIS) irradiation (370–800 nm). The enhanced production of hydroxyl radicals via water photooxidation for TNT/g-C3N4 composites was also ascertained by photoluminescence measurement using terephthalic acid as a radical trap. These results deriving from synergetic effects of TNT and g-C3N4 can be attributed to the photogenerated hole–electron separation enhanced at TNT/g-C3N4 interface, suggesting that g-C3N4 is a metal-free sensitizer for enabling VIS responsive photocatalysis in anodized TNTs even for gas phase reactions.