Application of fly ash-based iron-doped lithium aluminum layered double hydroxide in brine-type lithium resources extraction: Adsorption mechanism analysis and life cycle assessment

文献类型： 外文期刊

第一作者： Yin, Zhenzhou

作者： Yin, Zhenzhou;Zhao, Wenrui;Sun, Yutong;Wang, Gang;Ma, Tianhai;Ji, Puhui;Sun, Jian

作者机构：

关键词： Solid waste management; Sustainable production; Density functional theory; 2-dimensional correlation spectrum; Material flow analysis

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：13.2； 五年影响因子：13.5 ）

ISSN： 1385-8947

年卷期： 2025 年 520 卷

页码：

收录情况： SCI

摘要： The industrial layout of "dual carbon goals" in new energy field has driven China's demand for lithium resources. Under the context of persistently declining lithium trading prices and escalating sustainable development demands, there is an urgent need to develop cost-effective, high-performance and eco-friendly lithium adsorbents for extracting brine-type lithium resources in China. In this study, Al and Fe components in fly ash (FA) were extracted to prepare FA-based iron-doped lithium aluminum layered double hydroxides (Li/Al-FA LDHs), which was used to extract brine-type lithium resources. The results showed that Li/Al-FA LDHs had outstanding adsorption capacity, adsorption selectivity and cycle number. Its maximum adsorption capacity for Li+ was 13.82 mg/g. After 50 adsorption-desorption cycles, its adsorption capacity for Li+ could remain 92.81 % of its initial adsorption capacity. Ion exchange between H+ and Li+ in octahedral cavities was an important adsorption mechanism for Li/Al-FA LDHs, it played an important role in the process of Li/Al-FA LDHs capturing Li+. Moreover, Fe3+ doping increased binding energy of Li/Al-FA LDHs, this led to its outstanding structural stability. Life cycle assessment results showed that adsorption mechanism should be fully utilized to improve lithium capture efficiency of Li/Al-FA LDHs to offset energy and resource consumption throughout its life cycle. This study not only developed a low-cost and high-performance adsorbent for extracting brine-type lithium resources, but also realized the resource disposal of FA. This production model achieved coordination between resource development and circular economy, it provided a demonstrative solution for industry green development.

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