液相逆流沉淀法制备纳米硫化锌

Synthesis of nanoparticles ZnS by liquid counter-current precipitation

研究了以硫化钠和氧化锌为主要原料,结合多级逆流沉淀和超声波振荡预分散制备纳米硫化锌粒子的方法。实验获得单级沉淀的适宜条件为:反应前超声波振荡氧化锌预分散时间为15 min,Na2S浓度为0.6 mol/L,反应温度为85～90℃,n(Na2S)/n(ZnO)=1.3:1,反应时间为150 min,n(NaOH)/n(ZnO)=10:1。经三级逆流沉淀所得纳米的ZnS晶型良好,晶粒尺寸约为55 nm,纯度在97%以上。

The ZnS nanoparticles are prepared by combining of the multistage counter-current precipitation method with pre-uhrasonic oscillation using Na2S and ZnO as raw materials. The optimum conditions of single stage precipitation are as follows ： 15 minutes of ultrasonic oscillation of ZnO solution ,0. 6 mol/L of Na2S concentration ,85 - 90℃ of reaction temperature, 1.3： 1 of n （ Na2 S ）/n （ ZnO）, 150 minutes of reaction time and 10 ： 1 of n （ NaOH ）/n （ ZnO ）. The ZnS nanoparticles are synthesized by three stages counter-current precipitation method. The obtained ZnS nanoparticles exhibit excellent crystallization with about 55 nm of particles size about 55 nm. The ZnS ouritv is hiher than 97%.