A Facile Synthesis of Hexagonal Spinel λ-MnO2 Ion-Sieves for Highly Selective Li+ Adsorption
Ion-sieves are a class of green adsorbent for extraction Li+ from salt lakes. Here, we propose a facile synthesis of hexagonal spinel LiMn2O4 (LMO) precursor under mild condition which was first prepared via a modified one-pot reduction hydrothermal method using KMnO4 and ethanol. Subsequently, the...
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doaj-b8f8ce3add70445f8648ec45f9698c1f2020-11-24T20:58:23ZengMDPI AGProcesses2227-97172018-05-01655910.3390/pr6050059pr6050059A Facile Synthesis of Hexagonal Spinel λ-MnO2 Ion-Sieves for Highly Selective Li+ AdsorptionFan Yang0Sichong Chen1Chentao Shi2Feng Xue3Xiaoxian Zhang4Shengui Ju5Weihong Xing6College of Chemical Engineering, Nanjing Technology University, Nanjing 210009, ChinaCollege of Chemical Engineering, Nanjing Technology University, Nanjing 210009, ChinaCollege of Chemical Engineering, Nanjing Technology University, Nanjing 210009, ChinaCollege of Chemical Engineering, Nanjing Technology University, Nanjing 210009, ChinaCollege of Chemical Engineering, Nanjing Technology University, Nanjing 210009, ChinaCollege of Chemical Engineering, Nanjing Technology University, Nanjing 210009, ChinaCollege of Chemical Engineering, Nanjing Technology University, Nanjing 210009, ChinaIon-sieves are a class of green adsorbent for extraction Li+ from salt lakes. Here, we propose a facile synthesis of hexagonal spinel LiMn2O4 (LMO) precursor under mild condition which was first prepared via a modified one-pot reduction hydrothermal method using KMnO4 and ethanol. Subsequently, the stable spinel structured λ-MnO2 (HMO) were prepared by acidification of LMO. The as-prepared HMO shows a unique hexagonal shape and can be used for rapid adsorption-desorption process for Li+ adsorption. It was found that Li+ adsorption capacity of HMO was 24.7 mg·g−1 in Li+ solution and the HMO also has a stable structure with manganese dissolution loss ratio of 3.9% during desorption process. Moreover, the lithium selectivity ( α Mg Li ) reaches to 1.35 × 103 in brine and the distribution coefficients ( K d ) of Li+ is much greater than that of Mg2+. The results implied that HMO can be used in extract lithium from brine or seawater containing high ratio of magnesium and lithium.http://www.mdpi.com/2227-9717/6/5/59LiMn2O4λ-MnO2ion-sievehydrothermal reactionadsorption |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Fan Yang Sichong Chen Chentao Shi Feng Xue Xiaoxian Zhang Shengui Ju Weihong Xing |
spellingShingle |
Fan Yang Sichong Chen Chentao Shi Feng Xue Xiaoxian Zhang Shengui Ju Weihong Xing A Facile Synthesis of Hexagonal Spinel λ-MnO2 Ion-Sieves for Highly Selective Li+ Adsorption Processes LiMn2O4 λ-MnO2 ion-sieve hydrothermal reaction adsorption |
author_facet |
Fan Yang Sichong Chen Chentao Shi Feng Xue Xiaoxian Zhang Shengui Ju Weihong Xing |
author_sort |
Fan Yang |
title |
A Facile Synthesis of Hexagonal Spinel λ-MnO2 Ion-Sieves for Highly Selective Li+ Adsorption |
title_short |
A Facile Synthesis of Hexagonal Spinel λ-MnO2 Ion-Sieves for Highly Selective Li+ Adsorption |
title_full |
A Facile Synthesis of Hexagonal Spinel λ-MnO2 Ion-Sieves for Highly Selective Li+ Adsorption |
title_fullStr |
A Facile Synthesis of Hexagonal Spinel λ-MnO2 Ion-Sieves for Highly Selective Li+ Adsorption |
title_full_unstemmed |
A Facile Synthesis of Hexagonal Spinel λ-MnO2 Ion-Sieves for Highly Selective Li+ Adsorption |
title_sort |
facile synthesis of hexagonal spinel λ-mno2 ion-sieves for highly selective li+ adsorption |
publisher |
MDPI AG |
series |
Processes |
issn |
2227-9717 |
publishDate |
2018-05-01 |
description |
Ion-sieves are a class of green adsorbent for extraction Li+ from salt lakes. Here, we propose a facile synthesis of hexagonal spinel LiMn2O4 (LMO) precursor under mild condition which was first prepared via a modified one-pot reduction hydrothermal method using KMnO4 and ethanol. Subsequently, the stable spinel structured λ-MnO2 (HMO) were prepared by acidification of LMO. The as-prepared HMO shows a unique hexagonal shape and can be used for rapid adsorption-desorption process for Li+ adsorption. It was found that Li+ adsorption capacity of HMO was 24.7 mg·g−1 in Li+ solution and the HMO also has a stable structure with manganese dissolution loss ratio of 3.9% during desorption process. Moreover, the lithium selectivity ( α Mg Li ) reaches to 1.35 × 103 in brine and the distribution coefficients ( K d ) of Li+ is much greater than that of Mg2+. The results implied that HMO can be used in extract lithium from brine or seawater containing high ratio of magnesium and lithium. |
topic |
LiMn2O4 λ-MnO2 ion-sieve hydrothermal reaction adsorption |
url |
http://www.mdpi.com/2227-9717/6/5/59 |
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