纳米氧化锌的合成及其在去除水中铜离子的应用

Synthesis of ZnO Nanoparticles and Their Applications in the Removal of Copper Ion in Environmental Water

采用一步水热法制备了纳米氧化锌粉体,并利用透射电子显微镜、X射线衍射仪进行了表征。以石墨炉原子吸收光谱法为检测手段,研究了纳米氧化锌粉体对水中铜离子的吸附性能。结果表明:该法合成的纳米氧化锌粉体为六方红锌矿结构,平均粒径为40nm;该粉体对水中的铜离子具有较高的选择吸附能力,其吸附量受介质的pH值影响,当pH值为5.0时,纳米氧化锌粉体对水中铜离子的吸附容量可达13.85mg/g,能够去除水中98.1%的铜离子,结果满意。

ZnO nanoparticles were synthesized by one -step hydrothermal method. Transmission electron microscope （TEM） and powder X -ray diffraction （XRD） were used for characterization and evaluation of the morphology and particle size of products. The adsorption characteristic of copper （II） on ZnO nanoparticles were investigated by determination with graphite furnace atomic absorption spectrometry （GFAAS）. The results showed that the structure of the ZnO nanopartieles is hexagonal zincite, and the average particle diameter is 40 nm. When the pH is 5.0, the adsorption rate and adsorption capacity of ZnO nanoparticles toward copper （II） was found to be 98.1% and 13.85 mg/g, respectively.