揭示锰钛基复合纳米球对锂的奇妙协同吸附:温和合成与分子动力学模拟的启示

IF 13.1 1区 化学 Q1 Energy Journal of Energy Chemistry Pub Date : 2024-09-21 DOI:10.1016/j.jechem.2024.08.067
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引用次数: 0

摘要

鉴于能源技术领域的蓬勃发展以及不同工业领域对锂的需求不断增长,传统的锂提取方法因其生产能力有限和运营成本高昂而被证明是不够的。这项研究采用锰钛复合 HMTO(Mn:Ti=1:4)锂离子筛(LIS)纳米球的新方法,以二水醋酸锂、碳酸锰和二氧化钛 P25 为主要材料。这些纳米球呈现出相对均匀的球形形态,粒度分布窄,平均粒径小(约 55 nm),比表面积大(43.58 m2 g-1),表面 O2- 含量高(59.01%)。当用作 Li+ 离子的吸附剂时,HMTO(Mn:Ti=1:4)LIS 的吸附速率很快,在 6.0 小时内就接近平衡,平衡吸附容量(qe)为 79.5 mg g-1,最大吸附容量(qm)为 87.26 mg g-1(初始浓度 C0:1.8 g L-1)。此外,HMTO(Mn:Ti=1:4)还能从模拟的高镁锂摩尔比盐湖卤水(Mg:Li=103)中萃取出大量锂,qe 达到 33.85 mg g-1,并具有显著的选择性(αMgLi=2192.76)。特别是 HMTO(Mn:Ti=1:4)LIS 的循环吸附性能令人满意。其吸附容量保持在较高水平,甚至在第 5 个循环后测定的容量(55.45 mg g-1)也超过了最新报道的吸附剂。最终,通过利用离子交换原理和分子动力学(MD)模拟,刻意揭示了奇妙的协同锂吸附机制。
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Uncovering fantastic synergistic lithium adsorption with manganese-titanium based composite nanospheres: Mild synthesis and molecular dynamics simulation insights
In light of the burgeoning energy technology sector and the ever-growing demand for lithium across diverse industrial domains, conventional lithium extraction methods have been proven inadequate due to their limited production capacity and high operational costs. This work introduces a novel approach to the manganese-titanium based composite HMTO (Mn:Ti=1:4) lithium ion-sieve (LIS) nanospheres, employing lithium acetate dihydrate, manganese carbonate and titanium dioxide P25 as the primary materials. These nanospheres exhibit relatively uniform spherical morphology, narrow size distribution, small average particle size (ca. 55 nm), large specific surface area (43.58 m2 g−1) and high surface O2− content (59.01%). When utilized as the adsorbents for Li+ ions, the HMTO (Mn:Ti=1:4) LIS demonstrates a fast adsorption rate, approaching equilibrium within 6.0 h with an equilibrium adsorption capacity (qe) of 79.5 mg g−1 and a maximum adsorption capacity (qm) of 87.26 mg g−1 (initial concentration C0: 1.8 g L−1). In addition, the HMTO (Mn:Ti=1:4) also delivers a high lithium extraction from the simulated high magnesium-lithium molar ratio salt lake brine (Mg:Li = 103), achieving a qe of 33.85 mg g−1 along with a remarkable selectivity (αMgLi=2192.76). Particularly, the HMTO (Mn:Ti=1:4) LIS showcases a satisfactory recycling adsorption performance. The adsorption capacity remains at a high level, even that determined after the 5th cycle (55.45 mg g−1) surpasses that of the most recently reported adsorbents. Ultimately, the fantastic synergistic lithium adsorption mechanism is deliberately uncovered by leveraging the ion exchange principles and molecular dynamics (MD) simulations.
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来源期刊
Journal of Energy Chemistry
Journal of Energy Chemistry CHEMISTRY, APPLIED-CHEMISTRY, PHYSICAL
CiteScore
19.10
自引率
8.40%
发文量
3631
审稿时长
15 days
期刊介绍: The Journal of Energy Chemistry, the official publication of Science Press and the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, serves as a platform for reporting creative research and innovative applications in energy chemistry. It mainly reports on creative researches and innovative applications of chemical conversions of fossil energy, carbon dioxide, electrochemical energy and hydrogen energy, as well as the conversions of biomass and solar energy related with chemical issues to promote academic exchanges in the field of energy chemistry and to accelerate the exploration, research and development of energy science and technologies. This journal focuses on original research papers covering various topics within energy chemistry worldwide, including: Optimized utilization of fossil energy Hydrogen energy Conversion and storage of electrochemical energy Capture, storage, and chemical conversion of carbon dioxide Materials and nanotechnologies for energy conversion and storage Chemistry in biomass conversion Chemistry in the utilization of solar energy
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