纳米氧化铝/氧化锰-硅藻土复合物对磷酸根阴离子的吸附
Adsorption of phosphate anion by nanosized aluminum oxide /manganese oxide-diatomite nanocomposites
查看参考文献23篇
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文摘
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为改善纳米金属氧化物颗粒在硅藻土表面的负载特性,在保留硅藻土大孔结构的同时提高纳米颗粒的分散性,本研究通过原位合成/负载法,制备出一种具有多级孔结构的纳米氧化铝/氧化锰-硅藻土复合物(Dt-Al-Mn).采用X射线衍射、扫描电子显微镜、透射电子显微镜和氮气吸脱附等温线分析等手段对其进行物相、形貌及孔结构等表征,并通过吸附实验来探究其对磷酸根离子的吸附特性.结果表明,硅藻土表面均匀负载了铝-锰双金属氧化物颗粒薄膜,该颗粒薄膜以无定形存在.Dt-Al-Mn不仅保留硅藻土的大孔结构,并且形成了大量的微孔和介孔结构,其比表面积和孔容为352.4 m~2·g~(-1)和0.535 cm~3·g~(-1),远高于硅藻土(Dt)和硅藻土负载氧化铝材料(DA).Dt-Al-Mn对磷酸根的最大吸附量为67.9 mg P·g~(-1),其吸附等温线较好地符合于Langmuir模型.综上所述,Dt-Al-Mn有望成为一种具有应用前景的富营养化水体修复材料. |
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其他语种文摘
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Novel hierarchically porous alumina /manganese oxide-diatomite composites (Dt-Al-Mn) were prepared via an in-situ synthesis /loading method. The oxide nanoparticles were well dispersed on the surface of diatomite and the macroporous structure of diatomite was well preserved. The X-ray diffraction,scanning electron microscopy,transmission electron microscopy and nitrogen adsorptiondesorption isotherms analysis techniques were used to characterize the composition,morphology and pore structure of the prepared Dt-Al-Mn nanocomposites. And phosphate adsorption experiments were conducted to evaluate the adsorption capacity of the nanocomposites. The results indicated that a granular Al-Mn bimetal oxide film with low crystallinity was coated on the surface of diatomite,and the macroporous structures of diatomite were well retained and considerable micropores and mesopores appeared. The composites exhibited much higher specific surface area and pore volume (352.4 m~2·g~(-1) and 0.535 cm~3·g~(-1),respectively) than the raw diatomite (Dt),and the modified diatomite was loaded with Al_2O_3(DA). In addition,the maximum phosphate adsorption capacity of Dt-Al-Mn was 67.9 mg P·g~(-1) and its adsorption isotherm fitted well with the Langmuir isotherm model. In summary,Dt-Al-Mn has the potential to be used for the removal of phosphate in water. |
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来源
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环境化学
,2017,36(10):2265-2273 【核心库】
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DOI
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10.7524/j.issn.0254-6108.2017022401
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关键词
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硅藻土
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金属氧化物
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磷酸根
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吸附
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地址
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中国科学院广州地球化学研究所, 中科院矿物学与成矿重点实验室;;广东省矿物物理与材料研究开发重点实验室, 广州, 510640
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0254-6108 |
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学科
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行业污染、废物处理与综合利用 |
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基金
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广东省广州市科技计划项目
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广东省自然科学杰出青年基金
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文献收藏号
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CSCD:6100254
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