Preparation of a permanent magnetic hypercrosslinked resin and assessment of its ability to remove organic micropollutants from drinking water
Preparation of a permanent magnetic hypercrosslinked resin and assessment of its ability to remove organic micropollutants from drinking water
复制标题
永磁超交联树脂的制备及其去除饮用水中有机微污染物的能力评价
DOI：
10.1007/s11783-014-0724-3
复制
发表时间：
2015-02-01
影响因子：
6.4
通讯作者：
Li, Aimin
中科院分区：
文献类型：
--
作者：
Wang, Wei;Ma, Yan;Li, Aimin
提出了一种基于新型永磁超高交联树脂W150的快速、有效去除饮用水中微量有机污染物的方法。通过悬浮-后交联反应制备了W150，其比表面积为1149.7 m2·g-1，粒径为50 μm ~ 100 μm，饱和磁化强度为8 emu·g-1。用W150吸附剂去除饮用水中的呋喃西林和土霉素，并与商品吸附剂XAD-4和F400 D进行比较。3种吸附剂对NFZ和OTC的吸附动力学均符合准二级动力学方程（r>0.972），吸附等温线均符合Freundlich方程（r>0.851）。结果表明，吸附剂粒径的减小和吸附剂孔隙的增大都促进了吸附。粒径对吸附的影响比孔径对吸附的影响更大。由于W150具有最小的粒径和最大的比表面积，因此其对NFZ（180 mg·g-1）和OTC（200 mg·g-1）的吸附动力学和吸附容量最大。对于微孔占优势的吸附剂，大尺寸吸附质的吸附量下降，因为难以接近的微孔。溶液pH值和离子强度也影响吸附。
A rapid and effective method based on a novel permanent magnetic hypercrosslinked resin W150 was proposed for the removal of organic micropollutants in drinking water. W150 was prepared by suspension and post-crosslinking reaction and found to possess a high specific surface area of 1149.7 m2·g−1, a small particle size of 50 μm to 100 μm, and a saturation magnetization as high as 8 emu·g−1. W150 was used to eliminate nitrofurazone (NFZ) and oxytetracycline (OTC) from drinking water compared with commercial adsorbents XAD-4 and F400D. The adsorption kinetics of NFZ and OTC onto the three adsorbents well fitted the pseudo-second-order equation (r>0.972), and the adsorption isotherms were all well described by the Freundlich equation (r>0.851). Results showed that the reduction in adsorbent size and the enlargement in sorbent pores both accelerated adsorption. Moreover, the effect of particle size on adsorption was more significant than that of pore width. Given that the smallest particle size and the highest specific surface area were possessed by W150, it had the fastest adsorption kinetics and largest adsorption capacity for NFZ (180 mg·g−1) and OTC (200 mg·g−1). For the adsorbents with dominant micropores, the sorption of large-sized adsorbates decreased because of the inaccessible micropores. The solution pH and ionic strength also influenced adsorption.