Tailoring Activated Carbon Properties for Pb(II) and Cr(VI) Removal from Water in Continuous Mode,Chemical Engineering & Technology

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Tailoring Activated Carbon Properties for Pb(II) and Cr(VI) Removal from Water in Continuous Mode
Chemical Engineering & Technology ( IF 1.8 ) Pub Date : 2021-12-03 , DOI: 10.1002/ceat.202100331
Houda Boustila _{1,

2} , Yasmine Boutillara ₁ , Leticia Fernandez Velasco ₃ , Ali Djellali ₁ , Sana Tazibet ₁

Affiliation

Dynamic adsorption of Cr(VI) and Pb(II) in single and binary mixture solutions at different pH values (2 and 6) was studied on activated carbons obtained by chemical activation of olive stones with different agents. The activated carbons exhibited large surface areas with diverse pore size distributions and surface chemistry. The adsorption tests, performed in continuous mode, revealed the existence of different adsorption sites for Pb(II) and Cr(VI). Besides, they emphasized the significant role of the pH, both of the medium and of the carbon surface, in the adsorption of Cr(VI). That is, an acidic medium favors the retention of Cr(VI) on activated carbon having a surface pH around 2 whereas an activated carbon with a more neutral surface shows high efficiency for binary mixtures at high contaminant concentrations for solulions at pH 6.

中文翻译：

定制活性炭特性，以连续模式从水中去除 Pb(II) 和 Cr(VI)

对通过用不同试剂对橄榄核进行化学活化获得的活性炭研究了在不同 pH 值（2 和 6）的单一和二元混合溶液中 Cr(VI) 和 Pb(II) 的动态吸附。活性炭表现出具有不同孔径分布和表面化学性质的大表面积。以连续模式进行的吸附测试揭示了 Pb(II) 和 Cr(VI) 存在不同的吸附位点。此外，他们强调了介质和碳表面的 pH 值在 Cr(VI) 吸附中的重要作用。也就是说，酸性介质有利于将 Cr(VI) 保留在表面 pH 值约为 2 的活性炭上，而具有更中性表面的活性炭在高污染物浓度下对 pH 值 6 的溶液显示出高效的二元混合物。

更新日期：2022-02-10

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