摘要
采用了悬浮聚合造粒法,以聚苯乙烯和Li_(1.6)Mn_(1.6)O_4粉体为原料制备球形锂离子筛前驱体,经0.5mol/L的HCl解析脱锂,得到球形锂离子筛。并利用X射线衍射、扫描电子显微镜、原子吸收分光光度计等测试手段对样品的晶体结构、形貌、吸附性能等进行表征。吸附-解析实验结果表明,球形离子筛前驱体在HCl中处理2 h后解析基本完成。球形锂离子筛对Li^+的吸附速率比较快,在含锂溶液中吸附3 h基本达到平衡。升高温度有利于离子筛对Li^+的吸附,在pH 12.57、温度70℃下,离子筛的平衡吸附量为24 mg/g。吸附过程符合Langmuir吸附等温方程和动力学二级模型,是单分子层化学吸附。球形锂离子筛对盐湖卤水中的锂具有良好的吸附和选择性以及良好的循环吸附性能,在卤水中经过10次循环吸附后,吸附量仍有9.2 mg/g,Mn的总溶损率只有1.92%。
A spherical lithium ion sieve precursor was synthesized by suspension polymerization using polystyrene resin and Li1.6Mn1.6O4 powder, and converted into a lithium ion sieve by leaching in 0.5 mol/L HCl solution. The crystal structure, morphology and adsorption capacity of the products were investigated by X-ray diffractometry, scanning electron microscopy and atomic absorption spectrophotometry. The desorption process was basically completed at 2 h. The adsorption rate of Li^+ by the spherical lithium ion sieve is fast. The adsorption capacity of the ion sieve reaches to equilibrium value after adsorption for 3 h. Increasing temperature is beneficial to the adsorption of Li^+ on the lithium ion sieve. The equilibrium adsorption capacity of the lithium ion sieve is 24 mg/g at pH 12.57 and 70 ℃. The adsorption process conforms to Langmuir adsorption isotherm equation and pseudo-second-order adsorption kinetics model, which is the monolayer chemical adsorption. After 10 cycles of adsorption in brine, the adsorption capacity is 9.2 mg/g, and the total loss rate of dissolved Mn is only 1.92%.
作者
柳睿
伍攀羽
石西昌
陈亚
徐徽
LIU Rui;WU Pan-yu;SHI Xi-chang;CHEN Ya;XU Hui(School of Metallurgical and Environment, Central South University, Changsha 410083, China)
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2019年第4期828-836,共9页
The Chinese Journal of Nonferrous Metals
