Nano-structured iron(III)-cerium(IV) mixed oxide: Synthesis, characterization and arsenic sorption kinetics in the presence of co-existing ions aiming to apply for high arsenic groundwater treatment
Nano-structured iron(III)-cerium(IV) mixed oxide: Synthesis, characterization and arsenic sorption kinetics in the presence of co-existing ions aiming to apply for high arsenic groundwater treatment
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DOI：
10.1016/j.apsusc.2013.06.132
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发表时间：
2013-10-15
影响因子：
6.7
通讯作者：
Ghosh, Uday Chand
中科院分区：
文献类型：
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作者：
Basu, Tina;Ghosh, Uday Chand
在这里，我们的目标是通过环保的绿色合成路线来开发一种高效的材料，其特征是纳米结构。从不同温度下一致的颗粒大小和差热分析可以很好地确定样品的热稳定性。双金属复合氧化物含有尺寸为10-20 nm的团聚晶态纳米颗粒，其经验组成为FeCe1.1O7.6。比表面积(m(2)g(-1))、孔体积(cm(3)g(-1))和最大孔宽(Nm)分别为10~4、0.1316和5.68。利用这一材料估计在存在某些地下水离子的情况下砷的吸附动力学表明，准二级动力学模型无疑是描述反应性质的最佳选择。地下水中存在的离子对As(V)的吸附能力显著降低(没有类似硅酸盐、硫酸盐、碳酸氢盐和磷酸盐的离子&氯化物)。然而，双金属复合氧化物对As(III)的吸附容量在名义上受上述离子存在的影响。在pH值接近7.0和摄氏30度的情况下，砷吸附反应的速率决定步骤被确认为多阶段过程。(C)2013爱思唯尔公司保留所有权利。
Here, we aim to develop an efficient material by eco-friendly green synthetic route that was characterized to be nano-structured. The thermal stability of the sample was well established from the consistent particle size at different temperature and also, from differential thermal analysis. The bimetal mixed oxide contained agglomerated crystalline nano-particles of dimension 10-20 nm, and its empirical composition as FeCe1.1O7.6. The surface area (m(2)g(-1)), pore volume (cm(3) g(-1)) and maximum pore width (nm) obtained from BET analysis were found to be 104, 0.1316 and 5.68 respectively. Use of this material for estimating arsenic sorption kinetics in presence of some groundwater occurring ions revealed that the pseudo-second order kinetic model is unambiguously the best fit option to describe the nature of the reactions. Groundwater occurring ions exhibit a notable decrease of As(V)-sorption capacity (no other ion > chloride similar to silicate > sulfate > bicarbonate > phosphate). However, As(III)-sorption capacity of the bimetal mixed oxide was nominally influenced by the presence of the above ions in the reaction system. Rate determining step of arsenic sorption reactions was confirmed to be a multistage process in the presence of the above ions at pH similar to 7.0 and 30 degrees C. (C) 2013 Elsevier B.V. All rights reserved.