發(fā)布時間：2019-06-06 19:15

【摘要】：隨著科學技術(shù)的快速發(fā)展,我國取得了舉世矚目的成就,但同時面臨著嚴重的環(huán)境污染,環(huán)境污染物的去除和復雜環(huán)境樣品的預處理成為突出問題。本文摒棄了吸附效率有限、專一性差的傳統(tǒng)吸附劑,利用分子印跡技術(shù)合成了對特定目標物具有特異性識別能力的分子印跡聚合物,并結(jié)合靜態(tài)吸附實驗研究了聚合物的吸附性能、識別性能和再生性能。同時將該聚合物作為固相萃取填料制備了分子印跡固相萃取小柱,討論了MISPE柱的固相萃取性能。主要研究內(nèi)容如下:(1)以4,4'-雙酚F為模板分子、α-甲基丙烯酸為功能單體、乙二醇二甲基丙烯酸酯為交聯(lián)劑,采用本體聚合法制備了一種4,4'-雙酚F分子印跡聚合物(BPF-MIPS),并對聚合物制備條件進行優(yōu)化,確定乙腈為致孔劑,模板分子與功能單體的適宜摩爾比為1:4,功能單體與交聯(lián)劑的適宜摩爾比為1:5。利用傅里葉紅外光譜、掃描電鏡、比表面分析、熱重分析等測試手段對聚合物的結(jié)構(gòu)和形貌進行表征,結(jié)果表明在本實驗條件下制備的BPF-MIPS是一種球狀,形貌均一,多孔且孔道復雜的交聯(lián)聚合物,比表面積和孔徑分別為75.67 m2/g和1.69 nm,并具有熱穩(wěn)定性。(2)結(jié)合靜態(tài)吸附實驗對4,4'-BPF在BPF-MIPS上的吸附行為及識別性能進行了探究。等溫吸附和動力學實驗表明,BPF-MIPS對4,4'-BPF的吸附量大于NIPS,大約歷時200 min達到吸附平衡,吸附平衡數(shù)據(jù)和動力學數(shù)據(jù)可分別用Freundlich模型和準二級動力學方程擬合。熱力學實驗表明該吸附過程是放熱的、自發(fā)進行的,且低溫有利于吸附。Scatchard方程分析表明:BPF-MIPS對水相中4,4'-BPF具有較強的吸附能力,吸附過程存在兩種不同類型的結(jié)合位點,高親和力結(jié)合位點的最大表觀吸附量達到37.1 mg/g,平衡解離常數(shù)為2.03×10-5 mol/L。選擇性實驗表明,BPF-MIPS對4,4'-BPF較好的選擇性,對雙酚A及苯酚的選擇性因子分別為2.07、11.7。聚合物重復使用8次后對4,4'-BPF的吸附量仍是初次使用時的94.9%,表現(xiàn)出良好的再生性能。(3)將BPF-MIPS作為填料制備了分子印跡固相萃取小柱(MISPE),MISPE柱以甲醇-水(7/3,v/v)為淋洗劑,甲醇-乙酸(9/1,v/v)為洗脫劑;MISPE柱的穿透體積為60 mL,穿透容量為5.98 mg/g,總傳質(zhì)系數(shù)0.0339 s-1,傳質(zhì)區(qū)長度為20.44 mm;MISPE柱對4,4'-BPF具有特異性,能將水環(huán)境中4,4'-BPF進行選擇性分離富集。
[Abstract]:With the rapid development of science and technology, China has made remarkable achievements, but at the same time, it is facing serious environmental pollution. The removal of environmental pollutants and the pretreatment of complex environmental samples have become outstanding problems. In this paper, the traditional adsorbents with limited adsorption efficiency and poor specificity were abandoned, and the molecular imprinted polymers with specific recognition ability for specific targets were synthesized by molecular imprinting technique. The adsorption properties, recognition properties and regeneration properties of the polymers were studied by static adsorption experiments. At the same time, the polymer was used as solid phase extraction packing to prepare the molecularly imprinted solid phase extraction column, and the solid phase extraction performance of MISPE column was discussed. The main research contents are as follows: (1) using 4, 4 mol-bisphenol F as template molecule, 偽-methacrylic acid as functional monomer, ethylene glycol dimethacrylate as crosslinker, A kind of 4, 4 / bisphenol F molecular imprinted polymer (BPF-MIPS) was prepared by bulk polymerization. The preparation conditions of the polymer were optimized. The optimum molar ratio of template molecule to functional monomer was 1 脳 4. The suitable molar ratio of functional monomer to crosslinker is 1 鈮，

本文編號：2494534