本文選題：鋰同位素分離　切入點：　出處：《高分子學(xué)報》2017年12期

【摘要】：以殼聚糖與4'-甲酰基苯并-15-冠-5醚為原料,通過希夫堿反應(yīng)制備了苯并-15-冠-5醚接枝殼聚糖薄膜,采用固-液萃取法研究薄膜吸附鋰離子動力學(xué)和熱力學(xué)行為,及其鋰同位素吸附分離性能.結(jié)果表明:冠醚接枝殼聚糖薄膜對鋰離子的吸附過程更加適合于準(zhǔn)二級動力學(xué)方程和Langmuir吸附等溫模型,薄膜對鋰離子的吸附是一個由化學(xué)吸附控制的單層表面吸附,是一個自發(fā)進(jìn)行的放熱過程.此外以水-碘化鋰/冠醚接枝殼聚糖薄膜(冠醚固載量為2.98 mmol/g)作為萃取體系,其單級分離因子高達(dá)1.053(10oC).且輕同位素6Li富集于薄膜相,重同位素7Li富集于液相.
[Abstract]:Chitosan films grafted with benzo-15-crown-5 ethers were prepared by the Schiff base reaction of chitosan with 4L-formylbenzo-15-crown-5 ethers. The kinetics and thermodynamic behavior of adsorbed lithium ions in the films were studied by solid-liquid extraction method.And its adsorption and separation properties of lithium isotopes.The results show that the adsorption process of lithium ion on chitosan film is more suitable for the quasi-second-order kinetic equation and Langmuir adsorption isotherm model. The adsorption of lithium ion on the film is a monolayer surface adsorption controlled by chemisorption.It is a spontaneous exothermic process.In addition, using water-lithium iodide / crown ether grafted chitosan film (crown ether immobilization capacity of 2.98 mmol / g) as extraction system, the single-stage separation factor was as high as 1.053 ~ 10oC ~ (-1).The light isotope 6Li is enriched in the thin film phase, and the heavy isotope 7Li is enriched in the liquid phase.
【作者單位】： 天津工業(yè)大學(xué)分離膜與膜過程國家重點實驗室/分離膜科學(xué)與技術(shù)國家級國際合作研究中心;天津工業(yè)大學(xué)材料科學(xué)與工程學(xué)院;天津工業(yè)大學(xué)環(huán)境與化學(xué)工程學(xué)院;
【基金】：國家自然科學(xué)基金(基金號51303130,21376176) 長江學(xué)者和創(chuàng)新團(tuán)隊發(fā)展計劃(項目號IRT13084)資助
【分類號】：TQ051.893
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本文編號：1701774