以部份腐植酸修飾之矽膠吸附三氮六環類似物並結合支撐式液膜萃取裝置之製備型應用

Adsorption and Preparative Supported-Liquid Membrane Extraction of Triazine Analogs with Humic Fraction-Immobilized Silica Gel in Hexane

胡順惟(Shun-Wei Hu) ； 陳志魁(Chih-Kui Chen) ； 陳世晞(Shushi Chen)

《化學》 74卷1期 (2016/03) Pp. 79-96

https://doi.org/10.6623/chem.2016008

摘要

酸性條件下所收集腐植酸部份修飾之矽膠能吸附己烷中多種三氮六環類似物，根據FTIR結果，部份腐植酸分子與分析物之間增強的氫鍵作用力（強的偶極-偶極作用力型態），非錯合作用(complexation)，是造成吸附現象的主因；針對所有的三氮六環類似物，己烷中1小時的吸附率幾乎可達100%，與取代基的類型、大小及其在氮環上所處的位置無關；除此之外，影響吸附率的因子尚包括液相的種類與基質中的添加物。此方法可稍加修改並透過碳氫膜的使用，即可在常溫常壓下大量濃縮、回收水溶液中的三氮六環類似物，在萃取室放置吸附劑有助於萃取效率因操作時間的縮短而提升；因此，分析物的穿透甚至於是1至幾乎100%的萃取率均會隨著溶劑的不同而改變，或取決於溶劑的蒸氣壓與極性，也因此高度受到膜的本質、厚度、分析物於二相間的溶解度差異以及吸附劑使用量的影響，但與分析物大小的相關性並不明顯。

關鍵字

吸附 ； 矽膠 ； 腐植酸部份 ； 三氮六環類似物 ； 製備型萃取 ； 膜

並列摘要

A fraction of humic acid is collected under acidic conditions, then immobilized on silica gel and used as the adsorbent for various symmetrical triazine (s-triazine) analogs in hexane. The enhanced hydrogen bonding between the analyte and humic fraction molecules, not the complexation interaction, is responsible for the adsorption observed in hexane, based on FTIR (Fourier Transform Infrared) Spectroscopy results. The percentage of adsorption in hexane for all s-triazine analogs reaches nearly 100% in 1 h, independent of the type, position and size of the substituent on the aromatic nitrogen heterocyclic ring. Other factors leading to the variation of the percentage of adsorption include the type of liquid phase and the additive of acidic or basic origin present in the matrix. The method is then modified to concentrate and recover large-scale s-triazine analogs in aqueous solution through the use of hydrocarbon-based membrane (e.g. PE, PP) under ambient temperature and atmospheric pressure. The presence of adsorbent in the extraction chamber facilitates the process, which in turn increases the process’s efficiency by reducing the operating time. Consequently, the permeation, and thus, the percentage of analyte extracted, ranging from 1 to almost 100%, varies among the solvents examined and is considered to be vapor pressure and polarity dependent, and thus, highly affected by the nature and thickness of the membrane, the discrepancy in solubility values of the analyte in two liquid phases and the amount of adsorbent used in the process. However, the dependence on the size of the analyte is not as significant.

並列關鍵字

Adsorption ； Silica gel ； Humic fraction ； Triazine analog ； Preparative extraction ； Membrane