本文選題：金屬離子 + PEBAX膜��； 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：近年來,環(huán)境污染的加重及環(huán)保意識的提高,使得研發(fā)出經(jīng)濟有效的汽油脫硫方法迫在眉睫,滲透汽化脫硫技術(shù)越來越得到重視。本研究選擇聚醚共聚乙酰胺(PEBAX2533)作為膜的分離層材料,以聚丙烯腈超濾膜(PAN)為支撐層,分別以納米氣相SiO2(n-SiO2)、微米固體SiO2(μ-SiO2)以及Ag+修飾的微米固體SiO2(Ag+SiO2)顆粒作為填充材料,制備填充型復(fù)合膜；并采用浸漬法制備了Ag+、Mn2+負載復(fù)合膜。分別進行了溶脹和滲透汽化實驗,旨在分離模擬汽油正庚烷/噻吩中的噻吩。利用FTIR、XRD以及SEM,對μ-SiO2和Ag+-SiO2顆粒的形貌特征進行了表征,FTIR和XRD分析結(jié)果表明：Ag+成功負載于μ-SiO2顆粒上,SEM分析顯示所制備的顆粒為形狀規(guī)則的球體,直徑約為200nm。膜的SEM結(jié)果顯示,顆粒均勻分散于膜的分離層中,無團聚現(xiàn)象,復(fù)合膜的分離層與支撐層相容性良好,結(jié)合緊密。負載實驗證明了Ag+、Mn2+成功負載于PEBAX/PAN復(fù)合膜上。溶脹實驗結(jié)果顯示,填充型復(fù)合膜及Ag+、Mn2+負載復(fù)合膜對噻吩都具有良好的溶解、吸附能力,膜的溶脹度與料液溫度、噻吩含量以及填充量有關(guān),溶脹度隨著溫度的升高及噻吩含量的增高而增大；當Ag+-SiO2顆粒填充量為8wt%時,填充型復(fù)合膜的溶脹度達到最大。滲透汽化實驗對膜分離噻吩的能力進行了考察,結(jié)果表明：隨著料液溫度及噻吩含量的增加,總滲透通量增大,分離因子下降；在30℃、待分離液噻吩濃度為1000}μg·g-1條件下,Ag+-SiO2填充型復(fù)合膜的填充量為8wt%時,分離效果最好,總滲透通量為5.627kg·m-2·h-1,對應(yīng)的分離因子為3.78；Ag+和Mn2+負載復(fù)合膜的通量分別為7.5kg·m-2·h-1、7.7kg·m-2·h-1,相應(yīng)的分離因子都為3.7。綜上所述,Ag+SiO2填充型復(fù)合膜和Ag+、Mn2+負載復(fù)合膜,有效改善了膜的分離效果。其中,同等實驗條件下,Mn2+負載復(fù)合膜的分離效果最優(yōu)。
[Abstract]:In recent years, with the aggravation of environmental pollution and the improvement of environmental awareness, it is urgent to develop an economical and effective desulfurization method for gasoline, and more attention has been paid to the technology of osmotic vaporization desulfurization. Polyether copolymerization acetamide (PEBAX2533) was used as the separation layer, polyacrylonitrile ultrafiltration membrane (pan) was used as the supporting layer, and nano-gas phase Sio _ 2 (n-SiO _ 2), micron solid Sio _ 2 (渭 -SiO _ 2) and Ag modified micron solid Sio _ 2 (Ag Sio _ 2) particles were used as filling materials, respectively. The filled composite membrane was prepared, and Ag mn 2 loaded composite membrane was prepared by impregnation method. The experiments of swelling and pervaporation were carried out to separate thiophene from n-heptane / thiophene. The morphologies of 渭 -SiO _ 2 and Ag -SiO _ 2 particles were characterized by FTIR XRD and SEM. The results of FTIR and XRD showed that the particles deposited on 渭 -SiO _ 2 particles were characterized by SEM, and the diameter of the particles was about 200 nm. The SEM results showed that the particles were uniformly dispersed in the separation layer without agglomeration. The separation layer of the composite membrane had good compatibility with the supporting layer and its binding was tight. The loading experiment proved that Ag / mn _ 2 was successfully loaded on PEBAX / pan composite film. The swelling test results show that both the filled composite membrane and the Ag / Mn2 supported composite membrane have good solubility and adsorption ability to thiophene, and the swelling degree of the film is related to the temperature of the feed solution, the content of thiophene and the filling amount. The swelling degree increases with the increase of temperature and thiophene content, and the swelling degree of the filled composite film reaches the maximum when the content of Ag -SiO 2 particles is 8 wt%. The capability of membrane separation of thiophene was investigated by pervaporation experiment. The results showed that the total permeation flux increased and the separation factor decreased at 30 鈩，

本文編號：2109931