Hierarchically porous titanium phosphate monoliths and their crystallization behavior in ethylene glycol
Hierarchically porous titanium phosphate monoliths and their crystallization behavior in ethylene glycol
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DOI：
10.1039/c5nj02820e
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发表时间：
2016-05
影响因子：
3.3
通讯作者：
Yang Zhu;K. Yoneda;K. Kanamori;K. Takeda;Tsutomu Kiyomura;H. Kurata;K. Nakanishi
中科院分区：
文献类型：
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作者：
Yang Zhu;K. Yoneda;K. Kanamori;K. Takeda;Tsutomu Kiyomura;H. Kurata;K. Nakanishi
首次通过溶胶-凝胶工艺合成了结合了明确的共连续大孔和可接近的大介孔的分级多孔磷酸钛整料，并使用硫酸氧钛和磷酸作为前体进行相分离。通过改变起始组成，大孔尺寸可在 0.6 μm 至 10 μm 的宽范围内调节，而合成的无定形整体材料的介孔尺寸和比表面积分别为 21 nm 和 320 m2 g−1。凝胶网络的结晶可以通过两种不同的方式诱导。高温（800℃）煅烧导致TiP2O7的形成以及宏观和细观结构的崩溃，而在乙二醇中对合成凝胶进行溶剂热处理导致在相对较低的温度下形成具有层状结构的磷酸钛板状晶体。具有分级多孔结构的磷酸钛整体料预计可用于各种应用，例如连续流催化、水修复和离子电池。
Hierarchically porous titanium phosphate monoliths combining well-defined co-continuous macropores and accessible large mesopores have been synthesized for the first time via a sol–gel process accompanied by phase separation using titanium oxysulfate and phosphoric acid as precursors. The macropore size was tunable over a broad range from 0.6 μm to 10 μm by changing the starting composition, while the mesopore size and the specific surface area of the as-synthesized amorphous monoliths are 21 nm and 320 m2 g−1, respectively. Crystallization of the gel network can be induced in two different ways. Calcination at elevated temperature (800 °C) leads to the formation of TiP2O7 and the collapse of both the macro- and meso-structures, while the solvothermal treatment of the as-synthesized gel in ethylene glycol leads to the formation of platy crystals of titanium phosphate with a layered structure at relatively low temperature. The titanium phosphate monoliths with a hierarchically porous structure are expected to be useful in various applications such as continuous-flow catalysis, water remediation and ion batteries.