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本文论述了活性炭表面化学结构与其对六价铬络合阴离子吸附能力之间的关系。根据一系列的实验结果,作者认为活性炭对Cr~(6+)的吸附属于化学吸附,并符合Gouy-Chapman-Stern-Grahame的电双层模式。发现了活性炭对Cr~(6+)的吸附量随其表面的羧基和羟其的比值的变化而变化,并可以用经验式Q=K·X~R来计算。 改变炭表面的官能基的类型和数量将改进对Cr~(6+)的吸附。因此,可以制得具有Cr~(6+)高吸附容量的活性炭。
This article discusses the relationship between the surface chemical structure of activated carbon and its ability to adsorb hexavalent chromium complex anions. According to a series of experimental results, the authors believe that adsorption of Cr 6+ by activated carbon belongs to chemisorption and conforms to the electric double layer model of Gouy-Chapman-Stern-Grahame. It was found that the adsorption capacity of activated carbon for Cr 6+ varied with the ratio of carboxyl to hydroxyl on its surface and could be calculated by the empirical formula Q = K · X ~ R. Changing the type and amount of functional groups on the carbon surface will improve the adsorption of Cr 6+. Therefore, it is possible to produce activated carbon having a high Cr 6+ adsorption capacity.