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首页> 外文期刊>Environmental Science & Technology >Individual and Competitive Adsorption of Arsenate and Phosphate To a High-Surface-Area Iron Oxide-Based Sorbent
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Individual and Competitive Adsorption of Arsenate and Phosphate To a High-Surface-Area Iron Oxide-Based Sorbent

机译：砷和磷酸盐对高表面积氧化铁基吸附剂的单独竞争性吸附

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Individual and competitive adsorption of arsenate and phosphate were studied on a high-surface-area Fe/Mn-(hydr)oxide sorbent with surface and bulk properties similar to those of two-line ferrihydrite. It has maximum adsorption densities of 0.42 μmol As m~(-2) at neutral pH and 1.24 μmol As m~(-2) at pH 3. A surface complexation model (SCM) that used the diffuse double layer model was developed that could simulate single and binary sorbate adsorption over pH 4-9. The predominant adsorbed arsenate and phosphate species were modeled as bidentate binuclear surface complexes at low pH and as monodentate complexes at high pH. The model initially overpredicted the inhibition of arsenate adsorption by the presence of phosphate. The overprediction was resolved by separating surface sites into two types: ones to which both arsenate and phosphate bind and a smaller number to which only phosphate binds. The modified model predicted the competitive adsorption of arsenate and phosphate over pH 4-9 at total As concentrations of 6.67 and 80.1 μM and a total P concentration of 129 and 323 μM The model may be used to predict arsenic adsorption to the sorbent for a given water source based on solution chemistry.
机译：在高表面积的Fe / Mn-（氢氧化）氧化物吸附剂上研究了砷酸盐和磷酸盐的个体和竞争性吸附，该吸附剂的表面性质和体积性质类似于两线水铁矿。在中性pH下最大吸附密度为0.42μmolAs m〜（-2），在pH 3下最大吸附密度为1.24μmolAs m〜（-2）。开发了使用扩散双层模型的表面络合模型（SCM），该模型可以模拟pH值在4-9之间的单一和二元山梨酸酯吸附。在低pH下，主要吸附的砷酸盐和磷酸盐物种建模为双齿双核表面复合物，在高pH下建模为单齿复合物。该模型最初高估了磷酸盐的存在对砷酸盐吸附的抑制作用。通过将表面部位分为两种类型来解决过度预测：砷酸盐和磷酸盐都与之结合，而磷酸盐仅与之结合的则较少。修改后的模型预测了在pH为4-9时砷的总浓度为6.67和80.1μM，磷的总竞争浓度为129和323μM时，砷和磷酸盐的竞争性吸附。该模型可用于预测给定条件下砷对吸附剂的吸附基于溶液化学的水源。

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