We studied trichloroethylene (TCE) adsorption from aqueous solutions in equilibrium conditions by activated carbons (AC). They differ in raw materials, porous structure characteristics and chemical state of the surface. TCE adsorption isotherms were found to have a concave shape, which is characteristic of a sorbent—sorbate weak interaction. It can be a result from electrostatic repulsion of organic matter molecule from polar groups on carbon surface and adsorbed water molecules. The basic parameters of adsorption were calculated by the Dubinin–Radushkevich equation. We determined that for AG-OV-1 and SKD-515 in the coordinates of the Dubinin–Radushkevich equation, there are two linear plots suggesting adsorption in pores of different sizes or reorientation of adsorbate molecules on the activated carbon surface. The efficiency of TCE removal by the activated carbons was evaluated. To reduce the TCE to the maximum allowable, the lowest sorbent consumption was observed for AC with the highest values of surface area and micropore volume. However, the high cost and hydrophobicity of these adsorbents make it impractical to use them in adsorption columns with a fixed layer. We offered an adsorbent that reasonably combines extraction efficiency, ease of operation and economic feasibility.

中文翻译：

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活性炭从水溶液中吸附三氯乙烯

我们研究了在平衡条件下活性炭（AC）从水溶液中吸附三氯乙烯（TCE）的过程。它们在原材料，多孔结构特征和表面化学状态方面有所不同。发现TCE吸附等温线呈凹形，这是吸附剂与被吸附物弱相互作用的特征。这可能是由于有机物分子被碳表面极性基团和吸附的水分子静电排斥而导致的。吸附的基本参数通过Dubinin–Radushkevich方程计算。我们确定在Dubinin–Radushkevich方程的坐标中对于AG-OV-1和SKD-515，存在两个线性图，表明在不同大小的孔中吸附或活性炭表面上的被吸附物分子重新取向。评估了活性炭去除三氯乙烯的效率。为了将TCE降低到最大允许值，对AC观察到了最低的吸附剂消耗，具有最高的表面积和微孔体积值。然而，这些吸附剂的高成本和疏水性使得在具有固定层的吸附塔中使用它们是不切实际的。我们提供了一种吸附剂，可以合理地兼顾提取效率，操作简便性和经济可行性。