基于环糊精包合作用的聚氨酯复合吸附材料  

Polyurethane Composite Adsorbent Based on Cyclodextrin Inclusion

作　　者：吴宏翔 袁镇豫 王煜 郭旭虹[1] 王杰[1] WU Hongxiang;YUAN Zhenyu;WANG Yu;GUO Xuhong;WANG Jie(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237

出　　处：《华东理工大学学报（自然科学版）》2020年第6期737-744,共8页Journal of East China University of Science and Technology

基　　金：国家自然科学基金(51403062)。

摘　　要：利用脂肪族异氰酸酯(六亚甲基二异氰酸酯HDI)和芳香族异氰酸酯(对苯二异氰酸酯PDI、二苯基甲烷二异氰酸酯MDI)作为交联剂与β-环糊精(β-CD)反应分别合成了3种β-环糊精/聚氨酯复合材料(CD-HDI、CD-PDI和CD-MDI),并通过扫描电镜、红外光谱、热重分析和紫外分光光度计等方法对复合材料的结构及复合材料对双酚A(BPA)和亚甲基蓝(MB)的等温吸附行为和吸附动力学进行了研究。采用不同等温吸附模型和动力学方程对实验数据进行拟合,结果表明,此类β-环糊精/聚氨酯复合材料表现出了优异的吸附性能且具有良好的可再生性,其中CD-MDI对BPA的最大吸附容量为116 mg/g,CD-PDI对MB的最大吸附容量为26.5 mg/g,同时CD-PDI的吸附速率最快。Both inorganic and organic pollutants in water result in damages on the ecosystem due to their toxicity and consumption of dissolved oxygen in the water.Adsorption separation has been regarded as one of the most widely used wastewater treatment methods because of its easy operation,low cost and recyclability.Cyclodextrin(CD)is a commonly used adsorbent material because of its ability for encapsulating of hydrophobic molecules,but its water solubility and low adsorption capacity limit its applications.Here,three different diisocyanates(hexamethylene diisocyanate HDI、1,4-phenylene diisocyanate PDI、diphenyl-methane-diisocyanate MDI)were selected as crosslinking agents to synthesize three CD-polyurethane composites(CD-HDI,CD-PDI,CD-MDI)with different structures.SEM,FT-IR,TG and UV-vis spectroscopy were employed to characterize the synthesized composites.The adsorption kinetic mechanism was studied by using pseudo-first-order model and pseudo-second-order model.The results showed that the pseudo-second-order model fitted better than the pseudo-first-order model,indicating that the adsorptions of the adsorbent against BPA and MB are chemisorption process.To study the adsorption mechanisms of CD-HDI,CD-PDI,CD-MDI toward different pollutants,three different models were applied to fit the equilibrium adsorption data.The results indicated that Sips model described the adsorption performances for BPA and MB very well,and the maximum adsorption capacity of CD-HDI,CD-PDI,CD-MDI was 65.3,106,116 mg/g for BPA and 8.90,26.5,18.0 mg/g for MB,respectively.The removal efficiency of BPA and MB by the adsorbent decreased by 0.80%—2.40%for BPA and 7.64%—13.4%for MB after 5 cycles,respectively,indicating the good recyclability of the adsorbent.

关 键 词：环糊精 二异氰酸酯 吸附 双酚A 亚甲基蓝 

分 类 号：X703.5[环境科学与工程—环境工程]