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首页> 外文期刊>Journal of Colloid and Interface Science >Silica adsorbent prepared from spent diatomaceous earth and its application to removal of dye from aqueous solution
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Silica adsorbent prepared from spent diatomaceous earth and its application to removal of dye from aqueous solution

机译：用废硅藻土制备的二氧化硅吸附剂及其在水溶液中去除染料中的应用

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摘要

The objective of this work is to study the activation regeneration of spent diatomaceous earth (SDE) for the preparation of silica adsorbents using thermal regeneration and acid/alkaline activation methods.Under the experimental conditions investigated,it was found that the alkaline activation method carried out by sodium hydroxide under controlled conditions is significantly superior to other heat and activation methods.The porosities of solids thus obtained are over 0.2,indicating that they are basically mesoporous.The optimal porous material thus prepared was used as a mineral adsorbent for methylene blue at 25 °C.The adsorption equilibrium revealed that the silica adsorbent can take up over 50 mg/g at relatively low concentrations in aqueous medium from the fittings of Langmuir and Freundlich isotherms with high correlations.On the other hand,the adsorption kinetic of methylene blue under various adsorbent dosages can be well described with a pseudo-second-order reaction model.
机译：这项工作的目的是研究利用热再生和酸/碱活化方法对废硅藻土（SDE）的活化再生，以制备二氧化硅吸附剂。在研究的实验条件下，发现采用碱性活化方法在控制条件下用氢氧化钠处理明显优于其他加热和活化方法。由此获得的固体孔隙率超过0.2，表明它们基本上是中孔的。由此制得的最佳多孔材料被用作25℃下亚甲基蓝的矿物吸附剂吸附平衡表明，在Langmuir和Freundlich等温线的拟合中，相对较低浓度的二氧化硅吸附剂在水性介质中的吸附量可高至50 mg / g以上;另一方面，在低压下，亚甲基蓝的吸附动力学用伪二级反应模型可以很好地描述各种吸附剂剂量。

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