【作者】 殷国俊； 曲文圆； 徐世艾；

【Author】 Guojun Yin;Wenyuan Qu;Shiai Xu;Shandong Provincial Key Lab of Chemical Engineering and Process,Yantai University;

【机构】 化学工程与过程山东省重点实验室烟台大学；

【摘要】 用活性炭从工业废水中脱除孔雀石绿一直是环境领域的研究热点,由于活性炭制备原料和生产工艺的不同,其物理化学性质差异显著,有关性质差异对孔雀石绿吸附的影响在文献报道中众说纷纭。本文选取四种商用活性炭,考察了25-45 o C,初始浓度60-200 mg/L下,它们对孔雀石绿的平衡吸附量、吸附模型和吸附热力学。结果表明活性炭对孔雀石绿的吸附等温线属于第一类吸附等温线,Langmuir模型可以拟合吸附等温线,活性炭对孔雀石绿的吸附热在20.72-35.09 kJ/mol之间,这说明活性炭对孔雀石绿的吸附机理是单层物理吸附,这与文献报道的结果一致。溶液pH值是影响吸附性能的关键因素,结果表明随着溶液p H值的增大,活性炭对孔雀石绿的吸附量增加,对于四种活性炭,吸附量的增加幅度均为40%。这说明只要找到活性炭上影响孔雀石绿吸附性能的关键物性参数,不同环境中孔雀石绿的吸附量均可以用该参数关联。我们将活性炭的物化参数与其对孔雀石绿的吸附性能相关联,发现活性炭表面的强酸性官能团不利于MG的吸附;MG的吸附量随着比表面积的增大而增加,二者几乎呈线性关系,文献报道的实验数据也符合说明本文的结果。因此,活性炭的比表面积可以用作确定评判其吸附MG吸附性能的关键参数。更多还原

【Abstract】 Malachite green(MG) separation from wastewater has always been a research focus in the field of environment. Removal of MG from aqueous solution using activated carbon has been studied or verified. Because of the different preparation materials and processes, the physicochemical properties of activated carbon differ significantly, and it is not clear which parameter affects on MG adsorption and to what extend it is. Four types of commercial activated carbon were selected to study their MG adsorption performance systematically, such as adsorption contact time, equilibrium adsorption capacities, Langmuir equation fitting, adsorption thermodynamics and effect of pH. Consistent with the results reported in the literature, the adsorption mechanism of MG on activated carbon is monolayer physisorption. We associate MG adsorption behavior on four activated carbons with the specific surface area from different pore structures and content of surface chemical groups, respectively. The results showed that the strong acidic groups have the detrimental influence on the MG adsorption, while the total specific surface area has a notable effect, showing a positive linear relationship between the total specific surface area and the adsorption capability. Therefore, the total specific surface area could be used as a key parameter to determine the adsorption performance of MG on activated carbon.更多还原