An effective method of iron extraction from bauxite residue was explored, and iron was used to prepare iron carbon composite material, which have a good adsorption effect on the heavy metal cadmium. After acid washing, acid leaching, Fe(III) reduction and ferrous oxalate decomposition, FeSO₄·H₂O(RM) was successfully extracted from bauxite residue, and the iron loss was only 4.35%. FexOy-BC(RM) nanocomposite materials were prepared by loading FeSO₄·H₂O(RM) onto walnut shell biochar (BC) (a kind of agricultural and forestry waste) by an in situ reduction and oxidation method. The results showed that the adsorption effect of FexOy-BC(RM) on Cd(II) was better than that of commercial FexOy-BC. XPS, TEM, SEM characterization analysis showed that FexOy-BC(RM) immobilized Cd(II) by adsorption, complexation, etc.to achieve a highly efficient adsorption of heavy metal Cd(II) in wastewater.

探索了一种从铝土矿渣中提取铁的有效方法，利用铁制备铁碳复合材料，对重金属镉具有良好的吸附作用。经过酸洗、酸浸、Fe(III)还原和草酸亚铁分解，成功地从铝土矿渣中提取了FeSO ₄ ·H _{2 O(RM)，铁损仅为4.35%。负载FeSO 4} ·H ₂制备FexOy-BC(RM)纳米复合材料O(RM) 原位还原氧化法在核桃壳生物炭 (BC)（一种农林废弃物）上。结果表明，FexOy-BC(RM)对Cd(II)的吸附效果优于商业FexOy-BC。XPS、TEM、SEM表征分析表明，FexOy-BC(RM)通过吸附、络合等方式固定化了Cd(II)，实现了对废水中重金属Cd(II)的高效吸附。