均一粒径BaSO4微球的合成及产率

Study on Synthesis and Yield of BaSO4 Microspheres with a Homogeneous Diameter

摘要:

以BaCl2、Na2SO4为原料，乙二胺四乙酸二钠（EDTA•2Na）为络合剂，采用络合法合成了均一粒径的BaSO4微球，并利用XRD、FTIR、XRF、SEM及DLS对BaSO4微球进行了表征。考察了EDTA•2Na用量、反应物浓度、反应温度、二次调节pH对BaSO4微球形貌和产率的影响。BaSO4微球合成的最佳条件为：c(BaCl2)= 1.0 mol/L，n(EDTA•2Na):n(BaCl2):n(Na2SO4)=1:1:1，反应温度55 ℃，pH=9.0。结果表明：合成产物是BaSO4，单分散且粒径在1.3~1.8 μm范围内的微球占总颗粒数量的47.01%，产率为74.15%。二次调节pH可将BaSO4的收率由74.15%提高至87.88%，但除了获得粒径1.5~2 μm的BaSO4微球外，还会获得大量亚微米级BaSO4颗粒，导致产物粒径均一性下降。

Abstract:

BaSO4 microspheres with a uniform diameter have been prepared in the presence of EDTA•2Na. The structures of BaSO4 microspheres were characterized by XRD, FTIR, XRF，SEM and particle size analyzer. The factors of EDTA•2Na dosage, the concentration of BaCl2 and Na2SO4, reaction temperature and pH adjusted once again were investigated. The prepared conditions are: c(BaCl2)=1.0 mol/L, n(EDTA•2Na):n(BaCl2):n(Na2SO4)=1:1:1，reaction temperature was 55 ℃ and pH was 9.0. Results showed that the particles are BaSO4. Monodisperse microspheres with the diameter ranging from 1.3 to 0.8 μm account for 47.01% of all particles. The yield of BaSO4 microspheres was 74.15%. When pH is adjusted once again to 7.0, the yield of BaSO4 increases from 74.15% to 87.88%. Meanwhile, BaSO4 diameter differs from sub-micron scale to 2 μm, which decreases the dimensional uniformity.