Driven by the increasing global demand for lithium,significant attention has been directed toward developing efficient technologies for lithium extraction from Salt Lake brines.Li_(1.6)Mn_(1.6)O_(4) spinel shows high ...Driven by the increasing global demand for lithium,significant attention has been directed toward developing efficient technologies for lithium extraction from Salt Lake brines.Li_(1.6)Mn_(1.6)O_(4) spinel shows high lithium selectivity and notable theoretical uptake capacity,indicating strong application potential in lithium extraction.However,the industrial application of this material is limited by its strong Jahn-Teller effect and manganese dissolution loss.In this study,LiOH and MnCO3 were selected as the raw materials and La_(2)O_(3) was used as the doping modifier.The La^(3+)-doped Li1.6Mn1.6O4 precursor(La-LMO)was fabricated through hydrothermal and high-temperature solid-phase synthesis techniques.Then La^(3+)doped H1.6Mn1.6O4 lithium ion-sieve(La-HMO)was prepared by pickling.The materials'structure and morphology were examined using XRD,SEM,TEM,and XPS techniques.La^(3+)doping does not alter the spinel structure of LMO but reduces Mn^(3+)content,mitigates the Jahn-Teller effect,lowers the manganese dissolution rate,and enhances structural stability.Adsorption of Li+onto La-HMO follows pseudo-second-order kinetics and fits the Langmuir model,suggesting homogeneous monolayer adsorption driven by chemisorption.In the lithium extraction experiment from the brine of West Tai Kinel Salt Lake,La-HMO demonstrated high adsorption capacity and superior selectivity for Li^(+).After five cycles,La-HMO maintained an adsorption capacity of 33.10 mg/g,higher than the 26.80 mg/g for undoped HMO.The manganese dissolution rate dropped from 4.65%to 4.04%.The study significantly improved the adsorption properties and structural stability of HMO by doping La^(3+),which has broad application prospects in the separation and extraction of lithium resources in Salt Lake.展开更多
A spray-drying assisted solid-state method to prepare spherical layer-structured H_(2)TiO_(3) ion sieve(LSTIS)particles is reported herein.The effects of synthesis parameters(calcination temperature,calcination time,a...A spray-drying assisted solid-state method to prepare spherical layer-structured H_(2)TiO_(3) ion sieve(LSTIS)particles is reported herein.The effects of synthesis parameters(calcination temperature,calcination time,and the lithium-titanium molar ratio)on adsorption-desorption performance(the delithiation ratio,titanium dissolution loss,and the adsorption capacity)were investigated.The as-prepared LSTIS exhibited an equilibrium adsorption capacity of 30.08 mg·g^(-1)(average of 25.85 mg·g^(-1) over 5 cycles)and ultra-low titanium dissolution loss of less than 0.12%(average of 0.086%over 5 cycles).The LSTIS showed excellent selectivity toward Li^(+) in Na^(+),K^(+),Mg^(2+),and Ca^(2+) coexisting saline solutions where its adsorption capacity reached 27.45 mg·g^(-1) and the separation factors of Li^(+) over the coexisting cations exceeded 100.The data suggests that the LSTIS is promising to competitively enrich Li^(+) from saline solutions.展开更多
基金We thank National Natural Science Foundation of China(grant No.22465030)the Programs of Science and Technology of Qinghai Province(grant No.2023-HZ-811)Kunlun Talents Leading Technological Talent in Qinghai Province.
文摘Driven by the increasing global demand for lithium,significant attention has been directed toward developing efficient technologies for lithium extraction from Salt Lake brines.Li_(1.6)Mn_(1.6)O_(4) spinel shows high lithium selectivity and notable theoretical uptake capacity,indicating strong application potential in lithium extraction.However,the industrial application of this material is limited by its strong Jahn-Teller effect and manganese dissolution loss.In this study,LiOH and MnCO3 were selected as the raw materials and La_(2)O_(3) was used as the doping modifier.The La^(3+)-doped Li1.6Mn1.6O4 precursor(La-LMO)was fabricated through hydrothermal and high-temperature solid-phase synthesis techniques.Then La^(3+)doped H1.6Mn1.6O4 lithium ion-sieve(La-HMO)was prepared by pickling.The materials'structure and morphology were examined using XRD,SEM,TEM,and XPS techniques.La^(3+)doping does not alter the spinel structure of LMO but reduces Mn^(3+)content,mitigates the Jahn-Teller effect,lowers the manganese dissolution rate,and enhances structural stability.Adsorption of Li+onto La-HMO follows pseudo-second-order kinetics and fits the Langmuir model,suggesting homogeneous monolayer adsorption driven by chemisorption.In the lithium extraction experiment from the brine of West Tai Kinel Salt Lake,La-HMO demonstrated high adsorption capacity and superior selectivity for Li^(+).After five cycles,La-HMO maintained an adsorption capacity of 33.10 mg/g,higher than the 26.80 mg/g for undoped HMO.The manganese dissolution rate dropped from 4.65%to 4.04%.The study significantly improved the adsorption properties and structural stability of HMO by doping La^(3+),which has broad application prospects in the separation and extraction of lithium resources in Salt Lake.
基金financially supported by the Prospective Joint Research Project of Industry,University and Research in Jiangsu Province(BY2016005-11)National Science and Technology Support Plan(No.2013BAE111B03)。
文摘A spray-drying assisted solid-state method to prepare spherical layer-structured H_(2)TiO_(3) ion sieve(LSTIS)particles is reported herein.The effects of synthesis parameters(calcination temperature,calcination time,and the lithium-titanium molar ratio)on adsorption-desorption performance(the delithiation ratio,titanium dissolution loss,and the adsorption capacity)were investigated.The as-prepared LSTIS exhibited an equilibrium adsorption capacity of 30.08 mg·g^(-1)(average of 25.85 mg·g^(-1) over 5 cycles)and ultra-low titanium dissolution loss of less than 0.12%(average of 0.086%over 5 cycles).The LSTIS showed excellent selectivity toward Li^(+) in Na^(+),K^(+),Mg^(2+),and Ca^(2+) coexisting saline solutions where its adsorption capacity reached 27.45 mg·g^(-1) and the separation factors of Li^(+) over the coexisting cations exceeded 100.The data suggests that the LSTIS is promising to competitively enrich Li^(+) from saline solutions.
