膜科学与技术

利用膜气液接触器制备纳米材料的研究

作者：常青²，贾志谦¹，秦晋¹，阿依努尔?买买提¹

单位： 1.北京师范大学化学学院膜科学与技术实验室，北京 100875；2.装甲兵工程学院再制造技术重点实验室，北京 100072

关键词：膜接触器；膜吸收；气液反应；纳米粒子制备；两相反应

出版年,卷(期):页码： 2012,32(3):79-85

摘要：

利用膜气液接触器制备了纳米CaCO3、SrCO3、Al(OH)3和Al2O3粒子。根据气液反应理论预测了Ca(OH)2浓度、CO2分压等对CO2吸收速率的影响规律，并得到了实验验证。在实验条件下，Ca(OH)2浓度和CO2分压对CaCO3粒子的形貌影响较小，粒径约为70nm。添加PVP 和PEG后，粒度降为48nm左右，分散性明显提高。所得SrCO3纳米粒子为球形，粒度均匀，Sr(OH)2浓度对粒子粒度具有明显影响。Al(OH)3粒子为球形，50nm左右，煅烧后得到Al2O3，粒子尺寸增加至70nm左右。反应后用稀盐酸清洗膜使之再生，膜重复使用9次，膜传质系数未见明显降低。

Nanosized calcium carbonate, strontium carbonate, aluminium hydroxide and alumina particles were prepared with a gas-liquid membrane contactor. The effects of Ca(OH)2 concentration and CO2 partial pressure on the absorption rate were estimated according to the gas-liquid reaction theory. The theoretical predictions are consistent with the experimental results. In the absence of additives, the particles, about 70 nm in size, are not sensitive to Ca(OH)2 concentration and CO2 pressure. In the presence of PVP and PEG, the particles are well-dispersed and the size can be reduced to 48 nm. The as-obtained SrCO3 nanoparticles are spherical, uniform in size. The alumina hydrates obtained are amorphous, about 50nm in size. After calcining at 800°C for 8 h, the amorphous Al(OH)3 converts to alumina and the particles size increases to 70 nm. After reaction, the membrane was washed with dilute hydrochloric and the membrane can be reused for at least 9 times without apparent performance deterioration.

常青（1987—），女，山西人，硕士研究生，主要研究方向为膜科学与技术，E-mail：qchang@mail.bnu.edu.cn. * 通讯联系人, E-mail： zhqjia@bnu.edu.cn

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