接枝改性聚丙烯酰胺凝胶的制备与除氟性能研究  

Study on preparation and performance of removing fluorine of grafted and modified polyacrylamide-gel

作　　者：蔡莉[1] 刘建[1] 胡希华[1] 

机构地区：[1]长安大学环境科学与工程学院,陕西西安710054

出　　处：《应用化工》2012年第2期190-194,共5页Applied Chemical Industry

基　　金：国家自然科学基金资助项目(50679003)

摘　　要：以聚丙烯酰胺凝胶(PAM-Gel)为骨架,以氨基二乙酸(IDA)为接枝螯合剂,在甲醛参与下,依据Mannich反应,制得螯合基团接枝凝胶,并通过在(NH4)Fe(SO4)2溶液中螯合Fe3+离子,使凝胶获得改性,得到一种新的具有配体交换性能的从含氟水中除氟材料。研究了该种改性凝胶除氟材料制备条件及在高氟水中除氟的效率,结果表明,该除氟剂具有良好的除氟性能,在含氟100 mg/L溶液中,饱和吸附量可达31.70 mgF-/g-gel;对含氟5 mg/L的含氟水,经二次除氟,总除氟率可达83.43%,水中剩余氟离子浓度可达国家饮用水标准。实验表明,水中常见共存离子对氟的吸附率无影响,表现出该种材料对氟吸附的高度选择性。A new material,with ligand exchange properties,of removing fluoride from the fluorine-containing water was obtained.This material was prepared,according to Mannich reaction,from polyacrylamide gel（PAM-Gel）,formaldehyde and iminodiacetic acid（IDA）.With that,it was modified by chelating Fe3＋ ions in（NH4）Fe（SO4）2 solution.Preparation conditions and performance of using this modified gel to remove fluoride from high fluoride water was studied.The results showed that the synthetic process of the gel was easy to operate,and its capability of removing fluorine was obvious and rapid.In the fluorine-containing water of 100 mg/L F-concentration,the saturated adsorption capacity was up to 31.70 mgF-/g-gel.As 5 mg/L F-concentration,through in twice adsorption,total removal rate of fluoride was up to 83.43% and the rest concentration of F-can meet with China national standards for drinking water.The test results showed as well,common-ions in water did not make affect on adsorbing fluor ions by the gel,and high selection in process of removing flours has been demonstrated.

关 键 词：聚丙烯酰胺凝胶 含氟水 除氟 配体交换 

分 类 号：TQ317.2[化学工程—高聚物工业] TU991.2[建筑科学—市政工程]