PEO基MOFs杂化泡沫材料对四环素和Cu2+吸附性能

ADSORPTION PERFORMANCE OF PEO-BASED MOFs HYBRID FOAM MATERIALS ON TETRACYCLINE AND Cu 2+

通过冰模板-冷冻干燥法合成了金属有机骨架杂化泡沫MIL-100(Fe)/PEO,利用X射线衍射、氮气吸附脱附、扫描电镜、TG-DSC技术,对杂化泡沫表面结构形态与元素组成进行表征分析,通过吸附实验分析了杂化泡沫吸附性能的影响因素及吸附动力学、吸附热力学和吸附等温线模型,利用循环再生稳定性实验研究了杂化泡沫分离再生稳定性。结果表明:MIL-100(Fe)/PEO杂化泡沫具有较强的机械强度和丰富的多孔结构,且保留了MIL-100(Fe)自身的特性;MIL-100(Fe)/PEO投加量为30 mg,吸附时间为12 h,四环素和Cu^(2+)初始浓度为30 mg/L,pH为中性时,MIL-100(Fe)/PEO对TC和Cu^(2+)的最大吸附量达到85.02,87.66 mg/g;材料的吸附过程符合拟二级动力学与Langmuir等温吸附模型,是一个放热、自发的过程;在循环吸附8次后,MIL-100(Fe)/PEO对TC和Cu^(2+)的去除率均保持在70%左右。MIL-100(Fe)/PEO杂化泡沫是一种高效稳定的吸附剂,在废水中四环素和Cu^(2+)复合污染物去除方面具有广阔的应用前景。

A metal-organic backbone hybrid foam MIL-100(Fe)/PEO was prepared by the ice-template-freeze-drying method.X-ray diffraction,nitrogen adsorption-desorption,scanning electron microscopy,and TG-DSC techniques were used to characterize the structural morphology and elemental composition of the surface of the hybrid foam.The factors influencing the adsorption performance of the hybrid foam and the adsorption kinetics,adsorption thermodynamics and adsorption isotherm models were analyzed by adsorption experiments,and the stability of the hybrid foam separation and regeneration was studied using recycling stability tests.The results showed that MIL-100(Fe)/PEO hybrid foam had strong mechanical strength and rich porous structure,and retained the properties of MIL-100(Fe)itself.The maximum adsorption of tetracycline(TC)and Cu ^(2+)by MIL-100(Fe)/PEO reached 85.02 mg/g and 87.66 mg/g at a MIL-100(Fe)/PEO dosing of 30 mg,an adsorption time of 12 h,an initial adsorption concentration of 20 mg/L,and neutral pH conditions.The adsorption process of the material followed the proposed secondary kinetics with the Langmuir isothermal adsorption model and was an exothermic,spontaneous process.The removal rates of both TC and Cu ^(2+)by MIL-100(Fe)/PEO were maintained at about 70%after 8 cycles of adsorption.MIL-100(Fe)/PEO heterogeneous foam is an efficient and stable adsorbent and promising in application in the removal of mixed pollutants of tetracycline and Cu ^(2+)from wastewater.