摘要
以ZnSO4、(NH4)2S为原料,通过加入分散剂对传统的液相沉淀法进行改进,制备出ZnS的纳米粉末,并探讨了制备过程中沉淀、洗涤、干燥以及晶化等阶段的反应条件对产物的影响.结果表明:以丙三醇为分散剂、原料配比(n(ZnSO4)/n((NH4)2S)为1∶0 9、料液浓度比1∶1,c(ZnSO4)、c((NH4)2S)均为0 2mol/L时为沉淀适宜工艺条件;干燥前对沉淀物用无水乙醇进行脱水处理,可有效地控制硬团聚体的产生;沉淀经400～600℃晶化1h,可得立方晶形β-ZnS纳米晶,产物为均匀球形,分散性较好;400℃晶化的产物晶粒尺寸约为40nm;600℃晶化的产物晶粒尺寸约为50nm.
Using ZnSO4 and (NH4)2S as the raw materials, nanocrystalline ZnS was prepared by using an improved precipitation method with the addition of organic dispertant. The effects of reactive conditions on the products were discussed. The results show that the proper conditions are that glycerol is used as dispertant, the molar ratio of n(ZnSO4) and n((NH4)2S) is 1∶09, the concentration ratio of c(ZnSO4) and c((NH4)2S) is 02M∶02M. Washing and dehydrating the precipitate by ethanol, can effectively prevent reunite of the particles. The XRD patterns show that the product is cubic β-ZnS, which is obtained from the precipitate calcinated at 400～600 ℃ for 1h. The dispersion states and the micrograph of the particles were observed with a scanning electron microscope. The results show that the particles are spherical and well dispers. The grain size is about 40 nm and 50 nm in diameter respectively at 400 ℃ at 600 ℃. The advantages of this method are that raw materials are lowcost and the operation is easy, so that it is easy to be used in industry.
出处
《材料科学与工艺》
EI
CAS
CSCD
2003年第1期97-100,共4页
Materials Science and Technology
