超高交联吸附树脂处理复合污染物的模拟研究

A Simulated Research of the Treatment of Combined Pollutants Using Hypercrosslinked Resin

以水体中常见的重金属铅离子及有毒有机物苯酚作为研究对象,考察了采用α-甲基吡啶化学修饰前后树脂(NJ-0和NJ-3)对复合污染的水体的吸附.Freundlich等温方程式能够对静态平衡吸附结果进行很好的拟合.2种树脂对苯酚的吸附容量大小顺序为NJ-0>NJ-3,对铅离子的吸附容量大小顺序为NJ-3>NJ-0.苯酚的吸附机理主要是π-π作用,铅离子的吸附机理则是离子交换和络合吸附等.苯酚和铅离子在2种树脂上呈现出协同吸附行为,这主要是形成了π电子-金属离子络合物,从而增强了吸附质和吸附剂之间的作用力.热力学参数的计算表明所有的吸附都是自发的过程,两种树脂对苯酚的吸附是放热的、由焓推动的过程,而树脂对铅离子的吸附是吸热的、由熵推动的过程.

A novel polymer （NJ-3） was synthesized by chemically modifying hypercrosslinked polymer （NJ- 0） with α-methypyridine. The adsorption of heavy metal ion （lead ion） and poisonous organic compound （phenol） onto the polymers NJ-0 and NJ-3 from its aqueous was carried out to estimate the possibility of combined polluted water treatment by adsorptive polymers. Freundlich equation was found to well fit the static equilibrium adsorption results. The adsorption capacity of phenol on polymer NJ-0 was higher than that on NJ-3, but the adsorption capacity mechanism of phenol adsorption appeared of lead ions on polymer NJ-3 was higher than that on NJ-0. The to be π-π reaction, and the mechanism of lead ion adsorption to be ion exchange and complexation adsorption. The coexistence of metal ions and phenol enhanced each other＇s adsorption capaci the reaction between ty, the which was attributed to the formation of πelectron-metallic ion complex to enhance adsorbent and the adsorbate. The calculated thermodynamic parameters indicated that all these adsorptions were spontaneous processes. The adsorption of phenol on the two polymers was an exothermic process driven by enthalpy, and the adsorption of lead ion was an endothermal process driven by entropy.