沉淀法制备FePO4的形貌控制

分别以FeCl3·6H2O，FeSO4·7H2O和Fe（NO3）3·9H20为铁源，NH4H2PO4，H3PO4和（NH4）3PO4·3H2O为磷源，用沉淀法制备了FePO4．研究了沉淀过程中原料、pH值以及表面活性剂对FePO4形貌的影响．采用X射线衍射、扫描电镜分别对样品的物相、形貌进行表征．研究结果表明，FePO4的形貌控制可以通过铁源、磷源、表面活性剂的选择和pH值等的控制来实现．H3PO4为磷源，以FeCl3·6H2O为铁源，当pH〈l时，制备的样品为均匀的铁皮石斛形，加入PEG后为自组装的圆片状，当pH〉1时，形貌为鸟巢形；以FeSO4·7H2O为铁源制备的样品形貌也以鸟巢形为主；以Fe（NO3）3·9H2O为铁源制备的样品表现为花状；以FeCl4·6H2O为铁源、（NH4）3PO4·3H2O为磷源制备的样品为不规则的片状；以FeSO4·7H2O为铁源、NH4H2PO4为磷源时制备的样品为类球形．表面活性剂及其用量在一定程度上有助于片状FePO4的制备．

Morphology control of FeP04 synthesized by co-precipitation

FePO4 was synthesized by precipitation method using FeC13·6H2O, FeSO4·7H2O, Fe（NO3）3·9H2O as iron sources and NH4H2PO4, H3PO4. （NH4）3PO4·3H2O as phosphorus sources. The effects of pH value, reaction temperature and surfactant on mor- phology of iron phosphate were investigated. The prepared samples were characterized by XRD and SEM. The results show that the control on morphology and size of FePO4 can be achieved by selecting iron sources, phosphorus sources, surfactant, pH value and so on. U- sing H3PO4 as phosphorus source and FeCl3·6H2O as iron source, uniform dispersion of dendrob shape iron phosphate can be observed when pH〈1 and self-assembly disks shape i- ron phosphate can be obtained afer adding PEG. while pH〉1, the iron phosphate particles were of nest shape. Using FeSO4·7H2O as iron source was also particles with nest shapet while using Fe（NO3）3·9H2O as iron source as flower-likely pariticles, irregular lamellar i- ron phosphate can be obtained when using FeC13·6H2O as iron source and （NH4）3PO4·3H2O as phosphorus source, while using FeSO4·7H2O as iron source and N H4 H2PO4 as phosphorus source was particles with nearly spherical-like shape. Lamellar iron phosphate can be synthesized in the help of the surfactant.