球形MnO2·0.5H2O提锂性能及其机理研究
Performance and Mechanism of Recovering Lithium from Aqueous Solution by Spherical MnO2·0.5H2O 
投稿时间:2021-05-25  修订日期:2021-07-19
DOI:10.12119/j.yhyj.202203003
中文关键词:  尖晶石型Li1.6Mn1.6O4  MnO2·0.5H2O  锂回收  吸附容量  吸脱附机制
英文关键词:Spinel Li1.6Mn1.6O4  MnO2·0.5H2O  Lithium recovery  Adsorption capacity  Adsorption-desorption mechanism
基金项目:National Natural Science Foundation of China(U20A20337);Natural Science foundation of Qinghai Province(2021-ZJ-903);Major science and technology projects of Qinghai Province(2019-GX-168)
作者单位
张果泰 中国科学院青海盐湖研究所,盐湖资源综合高效利用重点实验室, 青海省盐湖资源化学重点实验室,青海 西宁 810008
中国科学院大学,北京 100049 
漆贵财 中国科学院青海盐湖研究所,盐湖资源综合高效利用重点实验室, 青海省盐湖资源化学重点实验室,青海 西宁 810008
中国科学院大学,北京 100049 
海春喜 中国科学院青海盐湖研究所,盐湖资源综合高效利用重点实验室, 青海省盐湖资源化学重点实验室,青海 西宁 810008 
周园 中国科学院青海盐湖研究所,盐湖资源综合高效利用重点实验室, 青海省盐湖资源化学重点实验室,青海 西宁 810008 
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中文摘要:
      考察了形貌对尖晶石型锂离子筛吸附剂MnO2·0.5H2O吸附性能的影响。实验证明,反应物Mn2O3的形貌在很大程度上决定了前驱体及其吸附剂的形貌。采用XRD、SEM、TEM、FT-IR、XPS和N2吸附—解吸等温线等对样品进行了表征。表征和吸附实验结果表明,与立方形锂离子筛相比,球形锂离子筛具有较高的吸附容量(42.46 mg/g),同时对溶液中的Li+具有较高的选择性。表面脱质子和离子交换过程的共同作用增强了离子筛型吸附剂的提锂Li+性能。此外,本文对Li1.6Mn1.6O4与MnO2·0.5H2O的吸附—解吸机理进行了解释。
英文摘要:
      The influence of morphology on the adsorption capacity of spinel-structured MnO2·0.5H2O lithium ion-sieves(LISs)prepared by the treatment of a Li1.6Mn1.6O4 precursor in HCl was experimentally investigated.The obtained samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier-transform infrared spectroscopy(FT-IR),X-ray photoelectron spectroscopy(XPS),and N2 adsorption-desorption isotherms.Spherical LISs were demonstrated to have a higher adsorption capacity(up to 42.46 mg/g)and selectivity toward Li+ in solution than their cubic counterparts.As a result,the morphology of reactant Mn2O3 was determined to largely determine the morphology of the precursor prepared by a typical two-step solid-phase reaction and its corresponding adsorbent.Additionally,the results presented here indicate that both surface deprotonation and ion-exchange processes of the as-prepared sieve-type adsorbent contribute to its enhanced Li+adsorption performance.
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