铁锰复合氧化物/壳聚糖珠:一种环境友好型除磷吸附剂
Fe-Mn Binary Oxide Impregnated Chitosan Bead (FMCB):An Environmental Friendly Sorbent for Phosphate Removal
查看参考文献44篇
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文摘
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采用两步法制备了一种环境友好型除磷基吸附剂——铁锰复合氧化物/壳聚糖珠(FMCB),对其进行了表征,并对其磷吸附行为进行了系统研究.表征结果表明,该吸附剂为多孔纤维结构,比表面积为248 m~2·g~(-1),孔容为0.37 m~3·g~(-1).吸附实验结果表明,FMCB对磷的吸附容量远高于纯的壳聚糖颗粒,且Langmuir模型能更好地拟合FMCB对磷的吸附,最大吸附量为13.3 mg·g~(-1) (pH 7.0);准二级动力学模型能更好地拟合FMCB对磷吸附的动力学实验数据;溶液pH对磷的吸附影响较大,随着pH的增大,磷的吸附量逐渐降低;共存的Ca~(2+)和Mg~(2+)对磷吸附略有促进,而共存阴离子对磷吸附具有抑制作用,影响大小顺序为:SiO_3~(2-)>CO_3~(2-)>SO_4~(2-)≥Cl~-.吸附磷后的FMCB可用NaOH溶液进行脱附再生,并可重复使用.在进水磷初始浓度为3 mg·L~(-1)条件下,吸附达到穿透时(出水磷浓度达0.5 mg·L~(-1)),可处理约800个柱体积的模拟含磷废水. |
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其他语种文摘
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Fe-Mn binary oxide impregnated chitosan bead (FMCB), an environmental friendly sorbent for phosphate removal, was fabricated through impregnating Fe-Mn binary oxide into chitosan matrix. The FMCB was characterized by SEM and BET surface area measurement. The adsorption behavior of phosphate on the FMCB was systemically investigated. The FMCB showed a porous and fibrous structure, with a high BET specific surface area of 248 m~2·g~(-1) and a pore volume of 0.37 m~3·g~(-1). It had a much higher phosphate adsorption capacity than pure chitosan bead. Langmuir model was more suitable for describing the adsorption behavior and the maximal adsorption capacity was as high as 13.3 mg·g~(-1) at pH 7.0. The kinetic data were well fitted by the pseudo second order model. The phosphate adsorption on FMCB was pH-dependent and decreased with increasing solution pH. Coexisting Ca~(2+) and Mg~(2+) enhanced slightly the adsorption of phosphate, while the coexisting anions hindered the phosphate adsorption in the order of SiO_3~(2-)>CO_3~(2-)>SO_4~(2-)≥Cl~-. The phosphate-loaded FMCB could be effectively regenerated using NaOH solution and repeatedly used. In column tests, about 800 bed volumes of simulated groundwater containing 3 mg·L~(-1) were treated before breakthrough (phosphate concentration in effluent reached 0.5 mg·L~(-1)). |
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来源
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环境科学
,2016,37(12):4882-4890 【核心库】
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DOI
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10.13227/j.hjkx.201608168
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关键词
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铁锰复合氧化物
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壳聚糖珠
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磷
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吸附
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废水
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地址
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中日友好环境保护中心, 北京, 100029
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中国科学院烟台海岸带研究所, 中国科学院海岸带环境过程与生态修复重点实验室, 烟台, 264003
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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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0250-3301 |
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学科
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环境科学基础理论;行业污染、废物处理与综合利用 |
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基金
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国家自然科学基金项目
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文献收藏号
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CSCD:5862740
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