摘要：为了改善层状双金属氢氧化物(LDHs)材料对水体中碘离子的吸附性能,通过共沉淀法制备铜基LDH材料,利用煅烧及煅烧后还原分别制得层状双金属氧化物(CLDH)和Cu-Cu₂O-CLDH材料,并探究这3种LDHs材料对水体中I-的吸附性能。扫描电镜观察到Cu-Cu₂O-CLDH的表面上长出了小颗粒,X射线衍射结果证明这些小颗粒为Cu及Cu₂O,比表面积测试结果表明Cu-Cu₂O-CLDH的比表面积达到了316. 76 m²/g,远远大于LDH及CLDH材料。吸附实验结果显示:LDH和CLDH对I^-的饱和吸附容量分别为23. 8、84. 8 mg/g,而改性后的CuCu₂O-CLDH对I^-的饱和吸附容量提升到了134. 5 mg/g。根据I^-的吸附实验结果及吸附后的样品表征,发现Cu、Cu₂O能够与I^-反应生成CuI,加上与CLDH的协同作用,使得材料对I^-的吸附效率进一步提高。

Abstract: In order to improve the adsorption performance of layered double hydroxides ( LDHs) on iodide in water，copper-based layered double hydroxides ( LDHs) were prepared by co-precipitation method，and we synthesized the CLDH and Cu－Cu₂O－CLDH by calcination and reduction respectively．We explored the adsorption properties for I^－in water．Scanning electron microscopy found small particles on the surface of Cu－Cu₂O－CLDH．X-ray diffraction results confirmed that these small particles were Cu and Cu₂O．Specific surface area test results showed that the specific surface area of Cu－Cu₂O－CLDH reaches 316．76 m² /g，which is much larger than that of LDH and CLDH materials．The result of the adsorption showed that compared with LDH and CLDH，the saturated uptake capacity of Cu－Cu₂O－CLDH to I^－was increased form 23．8 mg /g and 84．8 mg /g to 134．5 mg /g respectively．According the result of adsorption experiment and the characterization of the sample after adsorption，we find that Cu－Cu₂O can react with I^－to form CuI，and due to the synergistic effect with CLDH，the adsorption efficiency of the material for I^－is further improved．

Keywords: layer double hydroxides; Cu－Cu₂O; in-suit growth; iodide adsorption