纳米纤维锂离子筛吸附剂的制备及表征

Preparation and characterization of lithium ion sieve nanofibrous adsorbents

通过静电纺丝制备了锂离子筛负载纳米纤维。研究了聚丙烯腈(PAN)和锂锰氧化物(Li1.6Mn1.6O4)配比对纳米纤维锂离子筛吸附剂提锂性能的影响。采用扫描电镜(SEM)和BET氮气吸附法对纳米纤维锂离子筛吸附剂的形貌和比表面积进行了表征。实验结果表明,在聚丙烯腈质量分数为7%和Li1.6Mn1.6O4质量分数为10%条件下,制得的纳米纤维锂离子筛吸附剂比表面积较大、提锂性能较好,其在质量浓度为10 mg/L的氯化锂溶液中对锂离子的吸附量可达13.6 mg/g。纳米纤维锂离子筛吸附剂克服了粉末状锂离子筛的不足,对实现海水提锂具有重要的参考价值。

The lithium ion sieve-loaded nanofibers were fabricated by electrospinning.The effects of the mix ratios of polyacrylonitrile（PAN） and Li1.6Mn1.6O4 precursor on the lithium adsorption capacity of nanofibrous adsorbents were investigated.The morphology and specific surface of nanofibrous adsorbents were characterized by scanning electron microscope（SEM）and BET nitrogen adsorption method.The larger specific surface area and better lithium adsorption capacity of nanofibrous adsorbents were observed and the lithium ion sieve nanofibrous adsorbents showed an adsorption capacity of 13.6 mg/g when immersed in 10 mg/L lithium chloride solution under the conditions of PAN 7%（mass fraction） and Li1.6Mn1.6O410%（mass fraction）.The lithium ion sieve nanofibrous adsorbents developed in the study have overcome the defects of the powder-type adsorbents and it′s an important reference for the realization of extracting lithium from seawater.