纳米氧化锌制备所需碱式碳酸锌的实验研究

Experimental Research on Basic Zinc Carbonate Used for ZnO Preparation

以碳酸铵和硝酸锌为原料对碱式碳酸锌前驱体的合成实验进行了分析研究。实验发现,碳酸铵与硝酸锌的物质的量比是碱式碳酸锌合成中影响碱式碳酸锌收率的主要因素,当物质的量比为1.5时碱式碳酸锌的收率最高。X射线衍射(XRD)、热分析(DSC-TG)和扫描电子显微镜(SEM)对实验样品的测试表明,所得碱式碳酸锌前驱体的主要存在形式为Zn_4CO_3(OH)_6·H_2O,其煅烧产物为晶粒尺寸在20～50nm之间的六方ZnO纳米粒子,粒子呈近球形,分散性好。

Zn（NO3 ）2 and （NH4）2CO3 are used as the raw materials to prepare basic zinc carbonate precursor by the precipitation method, with aim to seeking a reasonably experimental condition. The X-ray diffraction（XRD）, thermal analysis（DSC-TG） and scanning electron microscope（SEM） are used to characterize the structure and physical properties of the products. The experimental results indicate that the key factor for the fabrication of zinc carbonate is the rnol ratio between Zn（NO3 ）2 and （NH4）2CO3, and the optimal mol ratio is 1.5. In addition, the analysis results demonstrate that the main composition of basic zinc carbonate precursor is Zn4 CO3 （OH）6·H2O. After calcined in the muffle, the basic zinc carbonate precursor can be decomposed to crystalline ZnO ultra-fine particles,which have a hexagonal structure with the crystalline size between 20 and 50 nm.