Adsorption removal of phosphate from aqueous solution by active red mud.
Adsorption removal of phosphate from aqueous solution by active red mud.
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DOI：
10.1016/s1001-0742(07)60190-9
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发表时间：
2007
影响因子：
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通讯作者：
Liu Chang-jun;L. Yan-zhong;Luan Zhao-kun;Chen Zhao-yang;Zhan Zhongguo;J. Zhiping
中科院分区：
文献类型：
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作者：
Liu Chang-jun;L. Yan-zhong;Luan Zhao-kun;Chen Zhao-yang;Zhan Zhongguo;J. Zhiping
赤泥是氧化铝工业的废弃物，其含有较高的TiO 2和Fe 2 O3，是吸附阴离子污染物的活性组分。研究了热处理和酸热处理活化赤泥对磷的吸附性能。考察了影响吸附的因素。结果表明，在80 ℃、0.25mol/L盐酸溶液中酸热处理2 h，对磷酸盐的去除效果最好。对于热活化的赤泥，在700 ℃下热处理2 h的样品比其他热处理的样品具有更好的预成型性。活化后的赤泥除磷效果明显依赖于pH值，pH 7为除磷的最佳pH值。吸附符合Langmuir吸附等温式，酸热活化赤泥和热活化样品的最大吸附容量分别为202.9mgP/g和155.2mgP/g。
Red mud is the waste of alumina industry and has high TiO2 and Fe2O3 content which are active components for the adsorption of anion pollutants. In this study, the uptake of phosphate by red mud activated by heat treatment and acid-heat treatment was investigated. The factors influencing the adsorption were also investigated. The result showed that the red mud sample treated using acid-heat method at 80 C with 0.25 mol/L HCl for 2 h achieved the highest phosphate removal. For the heat-activated red mud, the sample heated at 700 C for 2 h preformed better than the other heat treatment. Phosphate removal by the activated red mud was significantly pH dependent, and pH 7 was the optimal pH for phosphate removal. The adsorption fits Langmuir isotherm model well and the maximum adsorption capacities of the acid-heat activated red mud and the heat activated samples were 202.9 mgP/g and 155.2 mgP/g, respectively.