Constructing graphite-like carbon nitride modified hierarchical yolk-shell TiO2 spheres for water pollution treatment and hydrogen production
Constructing graphite-like carbon nitride modified hierarchical yolk-shell TiO2 spheres for water pollution treatment and hydrogen production
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DOI：
10.1039/c5ta09919f
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发表时间：
2016-01-01
影响因子：
11.9
通讯作者：
Xie, Jimin
中科院分区：
文献类型：
--
作者：
Jiang, Zhifeng;Zhu, Chengzhang;Xie, Jimin
通过溶剂热法将石墨碳氮化物（g-C3 N4）与分级蛋黄壳结构的TiO 2微球的前驱体在二甲基甲酰胺（DMF）中混合，制备了g-C3 N4与分级蛋黄壳结构的TiO 2微球的杂化材料。DMF的引入使TiO 2蛋黄壳球在g-C3 N4表面得到很好的分散，从而提高了材料的比表面积。g-C3 N4具有独特的二维层状结构，有利于与TiO 2杂化。TiO 2与g-C3 N4之间足够的接触界面有利于光生电荷的分离。光在具有蛋黄-壳结构的二氧化钛微球内腔中的多次反射可以增加其光吸收。光催化实验结果表明，与纯TiO 2和g-C3 N4相比，所制备的复合TiO 2/g-C3 N4（TCN）具有更高的光催化活性。g-C3 N4与TiO 2的适当组合产生最高的光催化活性。具有蛋黄-壳结构的TCN的光催化活性高于不具有蛋黄-壳结构的TiO 2/g-C3 N4。根据实验结果，提出了一种可能的光催化机理，即空穴和超氧自由基是光催化剂的主要活性物种。该方法制备的TCN光催化剂具有较高的光催化活性和稳定性，有望应用于工业生产。
Graphitic carbon nitride (g-C3N4) was hybridized by hierarchical yolk-shell TiO2 spheres via a solvothermal method by mixing the as-prepared g-C3N4 with the precursor of the TiO2 yolk-shell spheres in dimethylformamide (DMF). The introduction of DMF made the TiO2 yolk-shell spheres to be dispersed well on the surface of g-C3N4, thus improving the specific surface area of the materials. The g-C3N4 has a unique two-dimensional layered structure, which is favorable for hybridizing with TiO2. The sufficient contact interface between TiO2 and g-C3N4 could be beneficial to the separation of photogenerated charges. Multiple reflections of light within the interior cavities of titania microspheres with a yolk-shell structure can increase their light absorption. The photocatalytic experimental results indicated that the as-prepared composite TiO2/g-C3N4 (TCN) showed enhanced photocatalytic activities compared with pure TiO2 and g-C3N4. A suitable combination of g-C3N4 with TiO2 produced the highest photocatalytic activity. Moreover, the photocatalytic activity of TCN with a yolk-shell structure is higher than that of TiO2/g-C3N4 without a yolk-shell structure. Based on our experimental results, a possible photocatalytic mechanism with holes and superoxide radical species as the main active species in photocatalysis was proposed. The TCN photocatalysts prepared in this case, with high photocatalytic activity and high stability, were a promising candidate for possible practical application in industrial production.