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氨基酸辅助制备CaWO4空心球及吸附Pb2+性能
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Abstract:
本论文以甘氨酸(Gly)为配体和结构导向剂，采用水热法制备了纳米微粒组装的直径约为4 μm的CaWO4空心球。SEM结果表明，氨基酸及反应时间对产物的形貌有重要影响。N2吸附–脱附结果表明，CaWO4空心球的BET表面积高达114.94 m2/g。原子吸收光谱结果表明CaWO4空心球对Pb2+有良好的吸附性质，与Langmuir吸附等温线拟合结果一致，最大吸附量为41.68 mg/g。CaWO4独特的中空结构和较大的比表面积赋予了CaWO4空心球在重金属吸附领域有广阔的应用前景。
By using glycine as a ligand and structure-directing agent, nanoparticles-assembled CaWO4 hollow microspheres with a diameter of 4 μm were prepared via a hydrothermal method. SEM results showed that the morphologies of the products were sensitive to the glycine and reaction time. N2 adsorption-desorption results indicated that the BET-specific surface area of the CaWO4 hollow microspheres was as high as 114.94 m2/g. The atomic absorption spectra results showed that the CaWO4 hollow microspheres exhibited excellent adsorption properties for Pb2+ adsorption, which was agreed with the Langmuir adsorption isotherm, and the maximum adsorption capacity was 41.68 mg/g. The unique hollow structures together with large specific surface areas might endow CaWO4 hollow microspheres with wide application prospects in heavy metal ions removal.
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