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以表面孔径为0.1μm的α-Al2O3陶瓷管为支撑载体,以硝酸锰和硝酸锂为主要原料,先采用水热法进行预成膜,再采用溶胶-凝胶法复合制备膜状含锂锰氧化物,利用XRD和SEM对合成产物进行表征,并进行单一气体渗透性能测试。结果表明,合成产物为膜状的锂离子筛前驱体LiMn2O4;膜的表面连续致密,没有明显的晶间孔和裂缺,膜厚度约为1μm;室温下膜对H2的渗透率为1.09×10-6 mol·s-1·m-2·Pa-1,H2/N2的理想分离因数达3.63,具有较好的选择分离性。研究结果为基于锂离子筛膜的连续化海水提锂技术开发提供了材料支撑。
The α-Al2O3 ceramic tube with a surface pore diameter of 0.1 μm was used as the support carrier. Manganese nitrate and lithium nitrate were used as the main raw materials, hydrothermal method was used to pre-form the film, and then the film-like lithium manganese Oxide, the synthesized product was characterized by XRD and SEM, and single gas permeability test was performed. The results showed that the synthesized product was a lithium ion sieve precursor LiMn2O4. The surface of the film was continuous and compact with no obvious intercrystalline pores and cracks. The film thickness was about 1μm. The permeability of the film to H2 was 1.09 × 10 -6 mol · s-1 · m-2 · Pa-1, H2 / N2 ideal separation factor of 3.63, has good selectivity. The results provide material support for the development of lithium extraction technology based on continuous Li-ion sieve membrane.