Use of CV- and TPP-montmorillonite for the removal of priority pollutants from water
Use of CV- and TPP-montmorillonite for the removal of priority pollutants from water
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DOI：
10.1016/j.clay.2006.04.016
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发表时间：
2007-04
影响因子：
5.6
通讯作者：
G. Rytwo;Ynon Kohavi;Ilan Botnick;Y. Gonen
中科院分区：
文献类型：
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作者：
G. Rytwo;Ynon Kohavi;Ilan Botnick;Y. Gonen
“重点污染物”一词用于界定对水生生物或人类健康有害的化学品。因此，必须从水中去除这些污染物，并设法减少其影响。粘土矿物可能有助于去除危险化学品，由于令人印象深刻的吸附性能。天然粘土矿物吸附阳离子和不带电的亲水性化合物，但几乎不与阴离子和疏水性污染物相互作用，因为大多数有机污染物，包括萘和酚类衍生物。通过用合适的有机阳离子预处理粘土矿物，可以调整吸附剂的表面性质，并观察到快速吸附，去除大量的此类污染物。在这项研究中，我们提出了有效的吸附萘和几种酚类衍生物的有机粘土制备的结晶紫或四苯基鏻离子吸附在蒙脱石上，直到获得一个带电中和的表面。吸附的污染物的量至少与高质量活性炭所测量的数量级相同，但吸附几乎立即进行，而对于活性炭则需要数十分钟。建议的有机粘土与砂混合，并在柱过滤器中进行测试，显示在几个孔隙体积的高浓度污染物的完全去除。由于快速的吸附动力学，吸附剂还可以有效地应用于“顺序分批”反应器中，然后进行絮凝，可以轻松分离纯化的流出物。用0.25 g有机粘土将150 ml 1000 μM TCP溶液完全纯化至3 μM以下。
The term “priority pollutants” is used to define chemicals hazardous to aquatic life or human health. Thus, it is essential to remove such pollutants from water and try to reduce their impact. Clay minerals might be helpful in the removal of hazardous chemicals, due to impressive adsorption properties. Natural clay minerals adsorb cations and non-charged hydrophilic compounds, but almost do not interact with anions and hydrophobic pollutants as most organic pollutants, including naphthalene and phenolic derivatives. By pre-treating clay minerals with a suitable organic cation, the surface properties of the adsorbent may be adapted, and fast sorption is observed, removing large amounts of such pollutants. In this study we present efficient sorption of naphthalene and several phenolic derivatives to organoclays prepared by adsorption of crystal violet or tetraphenylphosphonium ions on montmorillonite, until a charged-neutralized surface is obtained. The amounts of pollutant adsorbed are at least of the same order of magnitude of those measured for high quality activated carbon, but the adsorption proceeds almost immediately, whereas for activated carbon it takes tens of minutes. The proposed organoclays were mixed with sand and tested in column filters, showing complete removal of high concentration of pollutant at several pore volumes. The adsorbents can also efficiently be applied in “sequential batch” reactors due to the fast adsorption kinetic, followed by flocculation that allows easy separation of the purified effluent. A volume of 150 ml of a 1000 μM TCP solution was completely purified to levels below 3 μM, by means of 0.25 g organoclay.