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Comprehensive studies on phosphoric acid treatment of porous titania toward titanium phosphate and pyrophosphate monoliths with pore hierarchy and a nanostructured pore surface†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-04-09 00:00:00 , DOI: 10.1039/c8qi00146d
Yang Zhu 1, 2, 3, 4, 5 , George Hasegawa 5, 6, 7, 8, 9 , Kazuyoshi Kanamori 1, 2, 3, 4, 5 , Kazuki Nakanishi 1, 2, 3, 4, 5
Affiliation  

Simple post-treatments of the porous titania monolith in varied concentrations of phosphoric acid solution provide a series of monolithic titanium phosphates (TiPs) with a hierarchically porous structure together with an exquisite macropore surface. Depending on the reaction conditions, platy crystallites composed of either Ti2O3(H2PO4)2·2H2O, Ti(HPO4)2·H2O (α-TiP), or Ti2O(PO4)2·2H2O (π-TiP) are generated on the macropore skeleton via a dissolution and reprecipitation process, which forms distinct wrinkled surface morphologies. In addition, the treatments effectively suppress the shrinkage during drying, leading to lower bulk density. Post-calcination in air yields porous titanium pyrophosphates preserving the intricate porous architecture in some cases. Notably, the hierarchically porous TiP2O7 monoliths prepared from the α-TiP precursors have a good thermal robustness related to bulk density.

中文翻译:

具有多孔层次和纳米结构孔表面的磷酸处理多孔二氧化钛对磷酸钛和焦磷酸盐整体的综合研究

在各种浓度的磷酸溶液中对多孔二氧化钛整体进行简单的后处理,可提供一系列具有分级多孔结构以及精致大孔表面的整体式磷酸钛(TiP)。根据反应条件,由Ti 2 O 3(H 2 PO 42 ·2H 2 O,Ti(HPO 42 ·H 2 O(α-TiP)或Ti 2 O(PO 4)组成的板状微晶。)2 ·2H 2 O(π-TiP)通过大孔骨架生成溶解和再沉淀过程,形成明显的皱纹表面形态。另外,这些处理有效地抑制了干燥期间的收缩,从而导致较低的堆积密度。在空气中进行后煅烧可产生多孔的焦磷酸钛,在某些情况下可保留复杂的多孔结构。明显地,由α-TiP前体制备的分层多孔的TiP 2 O 7整料具有与体积密度有关的良好的热稳定性。
更新日期:2018-04-09
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