發(fā)布時間：2018-06-21 16:07

  本文選題：海藻酸鈉基 + 復(fù)合材料�。� 參考：《魯東大學(xué)》2017年碩士論文

【摘要】：由生物形成且富含羧酸陰離子和羥基的海藻酸鈉,是最豐富的天然多糖材料之一,憑借優(yōu)異的生物相容性、生物可降解性、無毒性以及低廉的成本和較強的螯合能力等具有廣泛的用途。本文以海藻酸鈉SA為基體合成兩種截然不同的復(fù)合材料。一是采用交聯(lián)固化的方法復(fù)合Fe3+得到粒徑約為1.5mm大小的F/A球,二是采用低溫酯化的方法復(fù)合改性廢棄對位芳綸得到P/A顆粒,最后分別用有機膦酸EDTMPA對這兩種不同形態(tài)的復(fù)合材料進(jìn)行高溫酯化改性得到EDTMPA-F/A和EDTMPA-P/A。尤其是合成的EDTMPA-F/A具有雙功能、雙性能的膦酸改性海藻酸鈉基復(fù)合材料在水污染治理以及催化合成生物柴油等應(yīng)用上具有實際意義。通過紅外、熱重以及掃面電鏡等手段對兩種材料進(jìn)行表征,同時探究兩種材料的催化及其吸附Pb(Ⅱ)性能。1.首先通過F/A和EDTMPA-F/A平衡催化對比實驗結(jié)果得到EDTMPA-F/A催化性能更加卓越,接下來圍繞EDTMPA-F/A催化實驗的單因素條件進(jìn)行初步探究得到最佳MR值為8:1,EDTMPA-F/A用量為9wt%,溫度為90oC;以這三個結(jié)論作為催化條件,通過RSM實驗設(shè)計分析后得到優(yōu)化的最佳催化條件MR值為6.634:1、EDTMPA-F/A用量為10.76552wt%、溫度為81.2713oC,按照該條件進(jìn)行重復(fù)試驗三次,實驗值均在89%左右。EDTMPA-F/A反復(fù)使用3次后,使用效率保持在44%以上。EDTMPA-F/A的催化動力學(xué)方程為:r=2.17×10-2exp(-10.25/RT)[CA][CB]-2.71×10-3exp(-4.15/RT)[CC][CD]。其次吸附性能的探究從F/A和EDTMPA-F/A靜態(tài)飽和吸附對比實驗表明,兩種材料對多種常見金屬離子均具有吸附效果,而EDTMPA-F/A對Pb(Ⅱ)的吸附效果尤為顯著,接下來以EDTMPA-F/A為主對吸附條件進(jìn)行探究得到吸附最佳pH值為3.5以及EDTMPA-F/A劑量為0.0150g時,EDTMPA-F/A吸Pb(Ⅱ)效率最高。通過與經(jīng)典的吸附模型擬合,得到EDTMPA-F/A的吸附過程為邊界層擴(kuò)散控速同時主要受粒內(nèi)擴(kuò)散的影響,整個過程吸熱而且界面混亂度變大。2.EDTMPA-P/A吸附性能的研究過程通過EDTMPA-P/A和P/A靜態(tài)飽和吸附對比實驗驗證吸附Pb(Ⅱ)性能顯著而且EDTMPA-P/A優(yōu)于P/A。接下來圍繞EDTMPA-P/A吸附Pb(Ⅱ)的實驗條件進(jìn)行初步探究得到Pb(Ⅱ)溶液的pH=4和EDTMPA-P/A的劑量為0.0150g時,吸Pb(Ⅱ)效率最高。EDTMPA-P/A吸附動力學(xué)曲線在2h內(nèi)達(dá)到平衡,為化學(xué)吸附中螯合配位控速,同時主要受液膜擴(kuò)散的影響,整個過程吸熱而且界面混亂度變大。同時在二元離子體系中,EDTMPA-P/A吸Pb(Ⅱ)性能卓越。用pH=1的HNO3溶液洗脫EDTMPA-P/A的洗脫率較高,在循環(huán)兩次使用后,洗脫率仍在70%以上。通過RSA構(gòu)建新的三元二次回歸模型,優(yōu)化實驗因素得到pH值為3.21、EDTMPA-P/A用量為20.1876mg、初始Pb(Ⅱ)濃度為1.642mmol/L為最佳吸附條件,按照該條件進(jìn)行重復(fù)試驗三次,實驗Q值均在191.63mg/g左右,穩(wěn)定性好。
[Abstract]:Sodium alginate, which is biologically formed and rich in carboxylic acid anions and hydroxyl groups, is one of the most abundant natural polysaccharides, with excellent biocompatibility and biodegradability. Non-toxic, low cost and strong chelating ability have a wide range of applications. In this paper, two different composite materials were synthesized with sodium alginate SA as matrix. One is to synthesize Fe _ 3 by crosslinking and solidification to obtain F- / A ball with the size of 1.5mm, and the other is to compound the modification of waste para-aramid by low temperature esterification to get P- / A particles. Finally, EDTMPA-F / A and EDTMPA-P / P / A were prepared by esterification of EDTMPA-F / A and EDTMPA-P / A respectively with EDTMPA. Especially the synthesized EDTMPA-F / A has dual functions and double performance phosphonic acid modified alginate matrix composites have practical significance in water pollution control and catalytic synthesis of biodiesel. The two materials were characterized by infrared, thermogravimetric and scanning electron microscopy, and their catalytic properties and adsorption properties of Pb (鈪，

本文編號：2049396