NaH(ZnPO4)2及α-磷锌矿的低热固相反应合成与调控

对合成层状磷酸锌氢钠（NaH(ZnPO4)2）的新路线进行了研究，用Na2HPO4·12H2O及Zn(NO3)2·6H2O作为起始原料，聚乙二醇-400（PEG-400）为表面活性剂，通过一步固相反应于60 ℃下陈化得到了层状磷酸锌氢钠。用XRD, TG/DTG 及 FTIR表征了产物。实验结果表明，NaH(ZnPO4)2在500 ℃附近有一个主要的失重峰，归属为HPO42-脱水变成P2O74- 离子。因此，作为有机反应的非均相催化剂时，该化合物具有足够的热稳定性。对照实验的结果显示陈化温度调控着反应产物的生成。即，当反应混合物在60 ℃陈化时，生成的是NaH(ZnPO4)2，当反应混合物在室温陈化时，生成的则是α-Zn3(PO4)2·4H2O。

Synthesis and Regulation between NaH(ZnPO4)2 and α‐Hopeite via a Solid State Reaction at Low‐heating Temperatures

A simple and novel route for the synthesis of layered sodium hydrogen zinc phosphate, NaH(ZnPO₄)₂, was studied, and the target product was obtained with Na₂HPO₄·12H₂O and Zn(NO₃)₂·6H₂O as raw materials and polyethylene glycol‐400 as a surfactant via a one step solid state reaction at 60 °C. The product was characterized with XRD, TG/DTG and FTIR. The experimental results showed that the NaH(ZnPO₄)₂ had only one major step of weight loss for dehydration of HPO₄^2? into P₂O₇^4? ions at around 500 °C, so it had enough thermal stability to use as heterogeneous catalyzer for organic reactions. The comparison experimental results suggested that aging temperature control the products of the synthesis, that is, the NaH(ZnPO₄)₂ was formed when the reaction mixture was aged at 60 °C, and the α‐Zn₃(PO₄)₂·4H₂O was obtained when the reaction mixture was aged at room temperature.