Lithium ion adsorbent based on charcoal and preparation method thereof

The invention relates to the field of lithium ion enrichment and extraction in lithium-containing energy mineral products, in particular to an adsorption material for lithium ions in brine, and specifically relates to a lithium ion adsorbent based on charcoal and a preparation method thereof. According to the method, the nut shells are used as the raw materials, the lithium ion adsorbent based on the biochar is prepared in the mode that aluminum salt-alkali carbonization and chemical grafting are combined, a new thought is provided for development of a biochar-based lithium ion adsorption material, extraction of lithium resources in brine is facilitated, and effective utilization of biochar resources is also facilitated. The charcoal-based lithium ion adsorbent prepared by the invention can effectively realize separation of lithium ions and calcium and magnesium ions in brine. 本发明涉及含锂能源矿产的中锂离子富集和提取领域，尤其涉及卤水中锂离子的吸附材料，具体为一种基于生物炭的锂离子吸附剂及其制备方法。本发明以坚果果壳为原料，采用铝盐-碱炭化和化学接枝相结合的方式制备基于生物炭的锂离子吸附剂，为生物炭基锂离子吸附材料开发提供了新思路，不仅有