改性无烟煤去除水中内分泌干扰物的性能探究

以KOH为改性剂对无烟煤改性,研究了改性前后无烟煤对3种内分泌干扰物EDCs(17α-乙炔基雌二醇EE2、双酚A BPA、磺胺甲噁唑SMZ)的吸附性能。结果表明,KOH改性对无烟煤的孔结构和表面性质产生影响,提高了无烟煤对3种EDCs的吸附量,其中对EE2的吸附量提高了近2倍。3种EDCs在改性前后2种无烟煤上的吸附过程均可用伪二级动力学描述,吸附等温线更符合Langmuir吸附等温方程,表现为化学吸附。改性前后2种无烟煤对EE2均表现出最高吸附能力,平衡吸附量(qe)分别为0.214 7μg/mg与0.622 9μg/mg;其次是BPA;最差是SMZ,qe仅为0.095 9μg/mg与0.124 2μg/mg。进一步研究表明,目标物的吸附情况与其憎水性质和分子结构有关,无烟煤吸附目标物的能力与其正辛醇/水分配系数正相关。

Adsorptive capacity of endocrine disrupt chemicals onto modified anthracites

In this paper,the author would like to introduce a method for preparing a modified adsorbent with nice affinity towards the endocrine disrupt chemicals (EDCs).To develop the modified adsorbent,we have chosen anthracite as a kind of raw material with a modifier potassium hydroxide and made a careful assessment of the adsorption equilibrium and the kinetics of the three kinds of EDCs (17αt-Ethynylestradiol (EE2),bisphenol A (BPA),sulfamethoxazole (SMZ)) on the original and modified anthracites,respectively.The results indicate that the pore structure and the surface functions of the anthracites tend to get changed through KOH modification with the increase of the adsorptive capacity of EDCs.Particularly speaking,it would be made possible for EE2 to increase the adsorptive capacity about twice as much as it had had before.When it was tested with the two simplified kinetic models,the first-order equation and the pseudo-second-order equation through the adsorption processes,the results we have gained can prove that the three kinds of EDCs onto the original and the modified anthracites tend to follow the pseudo-second-order kinetic model.What is more,the adsorption processes of the EDCs onto the original and modified anthracites have been found a great deal closer to Langmuir isotherm model than to that of Freundlich isotherm model.As to the adsorption isotherm results of the modified anthracite,it also suggests that the adsorption of EDCs is by nature a kind of monomolecular adsorption on the surface of the modified anthracites.Furthermore,the adsorption capacity of EE2 on the original and modified anthracites proves to be the highest with their equilibrium adsorption capacity (qe) 0.214 7 μ g/mg and 0.622 9 μg/mg being,respectively,just next to bisphenol A.In contrast,the adsorption capacity of sulfamethoxazole turns out to be the lowest,that is,0.095 9 μg/mg and 0.124 2 μg/mg on the original and modified anthracites,respectively.Last of all,the hydrophobic properties and the molecular structure of the target compounds can obviously affect their adsorptive capacity on the anthracites.On the other hand,the anthracite adsorption capacity for the target compounds proves to be in a positive correlation with their octanol/water distribution coefficients.Hence,the findings of this paper can surely be expected to offer some theoretical significance to the control of the trace contaminant removal by the modified anthracites.