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采用ZnCl_2浸渍活化法制备了巴旦木壳活性炭(BAC),并研究其在pH、BAC投加量、吸附温度、初始Cr(VI)含量和吸附时间这些影响因素下对Cr(VI)的吸附性能的影响。结果表明,在吸附温度为25℃、BAC用量为0.1 g、溶液pH为2、吸附时间为12 h,Cr(VI)废水的初始质量浓度为200 mg/L的条件下,Cr(VI)的吸附去除率最大能够达到97.68%,对Cr(VI)吸附量也能达到97.68 mg/g。BAC对Cr(VI)的动力吸附过程很好的符合准2级动力学方程,等温吸附也符合Langmuir、Freundlich吸附方程,这些说明了其对Cr(VI)具有良好的吸附能力。BAC表面存在芳香环的结构,主要有胺基、羧基、羟基等化学基团,且它是一种存在乱层石墨结构的无定形炭。
The activated carbon (BAC) was prepared by ZnCl 2 impregnation activation method and its adsorption on Cr (VI) under the influence of pH, BAC dosage, adsorption temperature, initial Cr (VI) content and adsorption time The impact of performance. The results showed that under the conditions of 25 ℃, BAC dosage 0.1 g, pH 2, adsorption time 12 h, initial Cr (VI) concentration of 200 mg / L, The maximum removal rate of adsorption reached 97.68% and the adsorption capacity of Cr (VI) reached 97.68 mg / g. The dynamic adsorption process of Cr (VI) by BAC is in good agreement with the Quasi-2 kinetic equation. The adsorption isotherm also conforms to the Langmuir and Freundlich adsorption equations, which shows that Cr (VI) has good adsorption capacity for Cr (VI). BAC surface aromatic ring structure, there are amino, carboxyl, hydroxyl and other chemical groups, and it is a random graphite layer structure of amorphous carbon.