用碳酸钠溶液直接混合硫酸镉溶液制备了沉淀碳酸镉,再以沉淀碳酸镉为基体,氢氧化钠溶液为转化剂,通过阴离子交换制备出氢氧化镉纳米材料。采用X射线衍射仪（XRD）和场发射扫描电子显微镜（FESEM）对沉淀碳酸镉和转化产物的结构和形貌进行了表征。结果表明,沉淀碳酸镉的结构遭到破坏,转化完全所得到的氢氧化镉的形貌完全不同于沉淀碳酸镉,为片状组装的不规则球体。紫外光照射下光催化降解罗丹明B染料测试表明,转化产物比沉淀碳酸镉具有更好的光催化降解性能,转化时间不同的产物表现出不同的降解效率。当20 mg的转化产物分散到50 mL 8 mg/L的罗丹明B染料中,在黑暗环境中磁力搅拌吸附120 min达吸附平衡,开启300 W紫外汞灯后,效率最高的转化产物可在180 min内将染料完全降解。

Precipitated cadmium carbonate（P-CdCO₃） was prepared by direct blend method with sodium carbonate solution poured into cadmium sulfate solution.Then,the as-prepared P-CdCO₃ was used as raw materials to produce cadmium hydro-xide[Cd（OH）₂] nanomaterials with sodium hydroxide as transforming agent.The structure and morphology of P-CdCO₃ and Cd（OH）₂ nanomaterials were characterized by powder X-ray diffraction（XRD） and field-emission scanning electron micro-scope（FESEM）.Results showed that the structure of P-CdCO₃ was destroyed and the morphology of completely transformed Cd（OH）₂ was irregular sphere assembled by sheets and totally different from P-CdCO₃. Photocatalytic degradation of Rhoda-mine B under irradiation of UV light tests demonstrated that the transformed products had better photocatalytic degradation property than P-CdCO₃ and different transformed products had various degradation efficiencies.The Rhodamine B could be degraded completely in 180 min under irradiation of 300 W mercury lamp with addition of best transformed product when 20 mg of transformed product was added into 50 mL of 8 mg/L Rhodamine B solution and the system was stirred for 120 min in dark to reach adsorption equilibrium.