陕西省凤县铅锌矿区向环境中释放大量Pb²⁺、Zn²⁺重金属离子，对周边水体、土壤和生态系统产生极大的负面影响。为了实现矿井水中重金属污染的治理和资源化利用，采用核桃壳热解制备的生物炭作为吸附剂，对模拟铅锌矿井水和实际铅锌矿井水中的Pb²⁺和Zn²⁺进行分离。然后，采用室温结晶工艺，以生物炭吸附的重金属离子为原料，2-甲基咪唑（DMZ）为有机配体，制备了biochar@(Zn)MOF和biochar@(Pb/Zn)MOF-W复合材料。

The lead-zinc mine area in Fengxian County, Shaanxi Province, release a large amount of heavy metal ions of Pb²⁺ and Zn²⁺into the environment, which has a great negative impact on the surrounding water, soil and ecosystem. In order to realize the treatment and resource utilization of heavy metal pollution in mine water, biochar was prepared by pyrolyzing walnut shell was used as an adsorbent to separate Pb²⁺ and Zn²⁺ in both simulated and actual lead-zinc mine water. Then, employing the room temperature crystallization process, biochar-adsorbed heavy metal ions were utilized as a raw material, and 2-methylimidazole (DMZ) was used as an organic ligand to create biochar@(Zn)MOF and biochar@(Pb/Zn)MOF-W composites.