DENG Nan，WANG Yujun，LUO Guangsheng

(State Key Laboratory of Chemical Engineering, Tsinghua University, BeiJing 100084，China)

Abstract: Using barium hydroxide and sulfuric acid as raw materials, nano barium sulfate particles and barium sulfate solution were prepared by batch method and membrane dispersion microreactor and characterized by XRD and TEM.The formation mechanism of nano barium sulfate during normal temperature aging and low temperature aging was studied, and the effects of chloride ions and sodium ions on the properties of barium sulfate were discussed.The results show that when the concentration of barium hydroxide and sulfuric acid solution is 0.5 mol/L, the solution volume flow is 60 mL/min and the low-temperature aging temperature is 5 ℃, nano barium sulfate particles with particle size of 32 nm and statistical average particle size of(24.4±5.3)nm can be prepared.After standing for 24 h, the suspension ratio of barium sulfate solution is as high as 98.1%, which is better than that prepared by room temperature aging method and traditional batch method.Under the condition of low temperature aging, barium sulfate particles grow slowly, the degree of grain development is low, the intensity of XRD diffraction peak is weak, leading to small particle size of barium sulfate.The suspension of nano barium sulfate solution is positively correlated with its zeta potential.The zeta potential distribution of highly suspended barium sulfate is concentrated and positive, and the suspension is stable and has good dispersion.Chloride ion has little effect on the particle size distribution of barium sulfate.Sodium ion will significantly reduce the suspension of barium sulfate solution, so the interference of sodium ion should be avoided.

Keywords: nano barium sulfate; membrane dispersion microreactor; suspension; low-temperature aging

中图分类号：TQ13                              文献标志码：A

文章编号：1008-5548(2022)01-0120-10

DOI:10.13732/j.issn.1008-5548.2022.01.013

收稿日期： 2021-06-07，修回日期：2021-11-26，在线出版时间：2021-12-07。

基金项目：国家自然科学基金项目，编号：21991102。

第一作者简介：邓南(1996—)，男，硕士研究生，研究方向为微反应器纳米材料的制备。E-mail：dengn14@126.com。

通信作者简介：

王玉军(1973—)，男，教授，博士，博士生导师，研究方向为膜分离及膜反应分离一体化技术、高效分离材料制备。

E-mail：wangyujun@mail.tsinghua.edu.cn。