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）=1.0mol/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1.3~1.8μm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=7.0可将BaSO4的收率由74.15%提高至87.88%,但除了获得粒径1.5~2μm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。
BaSO4 microspheres with uniform sizes were synthesized by complexation method using BaCl2 and Na2 SO4 as raw materials in the presence of EDTA×2 Na. The as-prepared samples were characterized by XRD, FTIR, XRF,SEM and DLS. The factors affecting the morphology and yield of BaSO4 microspheres such as dosage of EDTA×2 Na, concentration of reactants, reaction temperature and secondary adjusting the pH value were investigated. The optimizing conditions for the preparation of BaSO4 microspheres were obtained as follows： c（BaCl2）=1.0 mol/L, n（EDTA×2 Na） ∶ n（BaCl2） ∶ n（Na2 SO4）=1 ∶ 1 ∶ 1, reaction temperature 55 ℃ and pH=9.0. The results showed that monodispersed BaSO4 microspheres having various sizes from 1.3 to 1.8 μm account for 47.01% of all particles were obtained with a yield of 74.15%. Secondary adjusting the pH=7.0 could improve the yield of BaSO4, increasing to 87.88% from 74.15%. However, in addition to BaSO4 microspheres with a particle size of 1.5~2 μm, a large number of sub-micron grade BaSO4 particles were also obtained, which resulted in a decrease in the uniformity of the particle sizes of the product.
作者
郭晓燕
刘丽霞
刘月姣
孔敏方
靳海波
范代娣
GUO Xiao-yan;LIU Li-xia;LIU Yue-jiao;KONG Min-fang;JIN Hai-bo;FAN Dai-di(College of Chemical Engineering,Northwest University,Xi＇an 710069,Shaanxi,China;School of Chemical Engineering,Beij＇ing Institute of Petrochemical Technology,Beijing 102617,China;College of Chemical Engineering Beijing University of Chemical Technology,Beijing 100029,China;Beijing Key Laboratory of Fuels Cleaning and Advanced Catalytic Emission Reduction Technology,BeO＇ing 102617,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2018年第10期1641-1646,共6页
Fine Chemicals
基金
国家自然科学基金项目(21506171)
北京市属高校高水平教师队伍建设支持计划高水平创新团队建设计划项目(IDHT20180508)~~
关键词
BASO4
微球
均一粒径
功能材料
BaSO4
microspheres
uniform particle size
functional materials
