无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ
研究与开发

铝基锂吸附剂制备及其吸附性能研究

  • 唐娜 ,
  • 龚经款 ,
  • 项军
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  • 天津科技大学化工与材料学院,天津 300457
唐娜(1972— ),女,博士,教授,博士研究生导师,主要从事海卤水资源综合利用、膜与膜过程的研究。

收稿日期: 2020-02-27

  网络出版日期: 2020-08-12

基金资助

天津市自然科学基金资助项目(18JCZDJC37200)

Preparation and adsorption properties of aluminum-based lithium adsorbent

  • Na Tang ,
  • Jingkuan Gong ,
  • Jun Xiang
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  • College of Chemical Engineering and Material Science,Tianjin University of Science and Technology,Tianjin 300457,China

Received date: 2020-02-27

  Online published: 2020-08-12

摘要

以氯化锂、无水氯化铝为原料,通过正交实验优化反应合成条件,采用“一步法”制备LiCl·2Al(OH)3·nH2O型铝基锂吸附剂。分别探究了吸附时间、吸附温度、溶液初始pH、溶液初始Li+浓度对吸附性能的影响,对吸附前后的无机铝吸附材料做了表征,并考察了吸附剂的离子选择吸附性及稳定性能。结果表明:最佳吸附条件为在45 ℃下pH=7的锂溶液中吸附2 h,吸附容量高达到8.66 mg/g。XRD、FT-IR表征结果表明:所制吸附材料有良好的稳定性。且该吸附剂对Li+分配系数(K=10.06)远高于其他金属阳离子,吸附材料经5次循环使用后,吸附容量仍能保持原来的91.5%。在西藏龙木错盐湖卤水中,对锂的吸附量达到5.24 mg/g。吸附平衡数据拟合结果表明:铝基锂吸附剂符合Langmuir等温吸附模型,吸附是发生在吸附剂表面的单层吸附;吸附过程符合伪二级动力学,是典型的化学吸附过程。

本文引用格式

唐娜 , 龚经款 , 项军 . 铝基锂吸附剂制备及其吸附性能研究[J]. 无机盐工业, 2020 , 52(8) : 51 -56 . DOI: 10.11962/1006-4990.2019-0499

Abstract

Aluminum-based lithium adsorbent[LiCl·2Al(OH)3·nH2O] was synthesized with LiCl and anhydrous AlCl3 as raw materials by one-step method,and the reaction conditions was optimized by orthogonal experiment.The effects of adsorption time,adsorption temperature,initial pH and initial Li+ concentration on adsorption performance were investigated.The inorganic aluminum adsorption materials were characterized before and after adsorption.The selectivity of ion adsorption and stability of adsorbent were also discussed.The results showed that the optimum adsorption condition was 2 h in lithium solution with pH=7 at 45 ℃,and the adsorption capacity reached 8.66 mg/g.The results of XRD and FT-IR showed that the adsorbent material had good stability.The Li+ distribution coefficient of adsorbent(K=10.06) was much higher than that of other metalcations.After 5 cycles of adsorption,the adsorption capacity of the adsorbent can still maintain 91.5% of original value.And the lithium adsorption amount in Tibet Longmucuo brine reached 5.24 mg/g.The fitting results of adsorption equilibrium data showed that the adsorption of Al-based lithium adsorbent conforms to the Langmuir isothermal adsorption model,and the adsorption belongs to single layer adsorption which occurred on the surface of the adsorbent.The adsorption process accords with pseudo-second-order kinetics equation,which is a typical chemical adsorption process.

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