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在与前人不同的条件下水热合成了孔道结构铁磷酸盐(C4H12N2)2[Fe6(HPO4)2(PO4)6(H2O)2].H2O。用ICP、有机元素分析仪、TG-DTA、变温XRD、变温FT-IR等分析技术对其成份、物相和热变化过程进行了系统研究。结果表明,室温～330℃,化合物失去吸附水,有机模板哌嗪开始氧化脱氢;330～380℃,哌嗪环破坏,大部分有机模板和结晶水脱除,化合物结构骨架明显破坏;470℃化合物完全非晶化;650℃形成FePO4和Fe4(P2O7)3新物相。哌嗪起到平衡电荷和支撑结构的作用。哌嗪环破坏并脱除是导致结构破坏的根本原因。
The pore structure of iron phosphate (C4H12N2) 2 [Fe6 (HPO4) 2 (PO4) 6 (H2O) 2] .H2O was hydrothermally synthesized under different conditions from previous studies. The composition, phase, and thermal history were systematically studied by ICP, organic elemental analyzer, TG-DTA, temperature-programmed XRD and temperature-programmed FT-IR analysis. The results showed that at room temperature ~ 330 ℃, the compound lost adsorbed water and the organic template piperazine started to oxidize and dehydrogenate. At 330 ~ 380 ℃, the piperazine ring was destroyed, most of the organic template and crystal water were removed, The compound is fully amorphized; a new phase of FePO4 and Fe4 (P2O7) 3 is formed at 650 ℃. Piperazine acts to balance charge and support structure. Piperazine ring destruction and removal is the root cause of structural damage.