Preconcentration of U(VI) from aqueous solutions after sorption using Sorel’s cement in dynamic mode
Preconcentration of U(VI) from aqueous solutions after sorption using Sorel’s cement in dynamic mode
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DOI：
10.1007/s10967-005-0762-1
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发表时间：
2005-05
影响因子：
1.6
通讯作者：
N. Awwad;A. Daifullah
中科院分区：
文献类型：
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作者：
N. Awwad;A. Daifullah
氢氧化镁被认为是索雷尔水泥的一种成分，是一种对铀有很强吸附作用的水泥。索雷尔的水泥是氧化镁、氯化镁和水的混合物。采用间歇法对U(VI)的最佳吸附条件进行了研究。最佳接触时间为2小时。在初始浓度为20ppm，pH为5.5~6.5的范围内，U(VI)的最大吸附常数为Kads=0.9h-1。用2 g目数35目的索雷尔水泥填充聚丙烯色谱柱，通过8 L含10 ppb铀(VI)的水进行铀的预富集。分离铀(VI)的最佳条件为流速0.25ml/min，床层高度5 cm。用5wt%的三苯基氧化膦甲苯溶液作为有机溶剂，将铀与干扰元素铁(III)、钍(IV)分离，然后进行光度分析。U(VI)的测定是在溶液中加入偶氮砷III作为显色剂，用UV-160A分光光度计完成的。
Mg(OH)2was identified as a component of Sorel’s cement being a very strong sorbent for uranium. Sorel’s cement is a mixture of MgO, MgCl2and water. The optimal conditions for the adsorption of U(VI) was studied by the batch method. A contact time of 2 hours was found to be optimum. Maximum U(VI) uptake was observed in a pH range of 5.5-6.5 with a sorption constant ofKads= 0.9 h-1at initial concentration of 20 ppm. Polypropylene columns filled with 2 g of Sorel’s cement at a mesh size of 35 were used for the preconcentration of uranium by passing 8 l of water containing 10 ppb U(VI). A flow rate of 0.25 ml/min and a bed height of 5 cm were found to be the optimum for the U(VI) separation. A 5 wt% triphenylphosphine oxide solution in toluene was used as an organic solvent for the separation of uranium from interfering elements such as iron(III) and thorium(IV), prior to spectrophotometric analysis. The determination of U(VI) was accomplished by adding Arsenazo III as a coloring reagent to the solution and using a UV-160A spectrophotometer.