以Al(NO3)3·9H2O和尿素分别为铝源和沉淀剂,采用无模板水热法180 ℃保温12 h制备了长球状分级结构γ-AlOOH,通过X射线衍射、扫描电子显微镜、透射电子显微镜和氮气吸附-脱附法对所得产物进行表征,研究了γ-AlOOH纳米结构形成机理和其对重金属离子Cr(VI)、甲基橙和刚果红的吸附性能.结果表明:长球状分级结构γ-AlOOH的平均长度为 1.5 μm、宽度为1 μm,比表面积和平均孔容为146.33 m2/g与0.37 cm3/g;对重金属离子Cr(VI)、甲基橙和刚果红表现出了优良的吸附性能,其最大吸附量分别为14.36mg/g、84.93mg/g和258.02 mg/g.
Long-sphere like hierarchical γ-AlOOH was prepared by a facile template-free hydrothermal method at 180 ℃ for 12 h with aluminum nitrate (Al(NO3)3·9H2O) as an aluminum source and urea as a homogeneous precipitation solvent.The obtained sample was characterized by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy and N2 adsorption desorption technique, respectively.The possible formation mechanism of the long-sphere like γ-AlOOH was discussed.The adsorption properties for Cr(VI), Methyl orange, Congo red were also examined.The results indicate that the size of the obtained long-sphere like hierarchical γ-AlOOH is an average length of 1.5 μm and an avarege width of 1 μm.The sample has the specific surface area of 146.33 m2/g and an average pore volume of 0.37 cm3/g.Also, the hierarchical γ-AlOOH shows the superior removal efficiency for Cr(VI), Methyl orange and Congo red with the maximum adsorption capacities of 14.36, 84.93 and 258.02 mg/g, respectively.
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