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制备了MIL-53(Al)、DUT-4和DUT-53种材料,并将其作为吸附剂对水中全氟辛烷磺酸基化合物(PFOS)进行吸附去除。结果表明,金属核心粒子与MOFs骨架结构相同的情况下,有机配体分子长度越长,材料对PFOS的吸附量越大。Langmuir模型能较好的拟合3种材料吸附PFOS的吸附等温线数据,MIL-53(Al)、DUT-4和DUT-5对PFOS的最大理论吸附量分别为68.05、176.5、326.9 mg/g。3种材料对PFOS的吸附动力学符合准2级动力学模型,吸附平衡时间均在100 min左右。随溶液p H的增加,吸附量有所减少。
MIL-53 (Al), DUT-4 and DUT-53 materials were prepared and used as adsorbents to remove perfluorooctane sulfonate (PFOS) in water. The results show that the longer the length of the organic ligand molecules, the larger the adsorbed amount of PFOS on the metal core particles is. The Langmuir model can well fit the adsorption isotherm data of PFOS with three materials. The maximum theoretical adsorption capacities of MIL-53 (Al), DUT-4 and DUT-5 to PFOS are 68.05, 176.5 and 326.9 mg / g . The adsorption kinetics of PFOS by the three kinds of materials accorded with quasi-second-order kinetic model, and the adsorption equilibrium time was about 100 min. With the increase of solution pH, the amount of adsorption decreased.