Mg/Fe-LDHO/PES复合膜吸附材料的制备与除氟性能  

Preparation and Defluoridation Performance of Mg/Fe-LDHO/PES Membranous Adsorbent

作　　者：吴涛[1] 毛丽莉[1] 王海增[1] WU Tao MAO Lili WANG Haizeng(Key Laboratory of Marine Chemistry Theory and Technology of Ministry of Education, College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100)

机构地区：[1]中国海洋大学化学化工学院,海洋化学工程与技术教育部重点实验室,青岛266100

出　　处：《材料导报》2017年第14期26-30,45,共6页Materials Reports

基　　金：国家科技支撑计划资助项目(2014BAK13B02)

摘　　要：以层状氢氧化镁铁的焙烧产物(Mg/Fe-LDHO)和聚醚砜(PES)为原料,采用共混法制备了Mg/Fe-LDHO/PES复合膜吸附材料,并研究了其对水中氟离子的吸附性能,考察了初始pH值、初始F-浓度、吸附温度、吸附时间以及共存阴离子等因素对吸附效果的影响。结果表明:在25℃条件下,该复合膜饱和吸附容量为12.34mg/g,能在pH=4~10范围内保持稳定的吸附性能,吸附速率较高,前5min内即可达到平衡吸附容量的75%;低温有利于提高复合膜的吸附性能,吸附过程符合准二级动力学模型。通过傅里叶变换红外光谱仪(FT-IR)和扫描电子显微镜(SEM)对复合膜的形貌及结构进行了表征,采用电位滴定法测得复合膜的零电位点pH值(pHpzc)为9.4。A hybrid membranous adsorbent for defluoridation of water was prepared by blending method using roasted product of Mg-Fe layered double hydroxides and polyethersulfone as raw materials.Defluoridation performance of the hybrid membranous adsorbent was systematically evaluated with various operation parameters including initial pH,initial fluoride concentration,temperature,contact time and co-existing anions.The hybrid membranous adsorbent performed well over a broad pH range and an instant defluoridation capacity（DC）accounting for 75% of equilibrium absorption capacity was obtained within the initial 5minutes.A maximum DC of 12.34mg/g for the hybrid membranous adsorbent was obtained by isotherm study,and it suggested a relative low operation temperature would be favor for the fluoride adsorption.The pseudo-second-order kinetic equation described the kinetic date fairly well.The surface morphology and cross-section structure of the hybrid membrane were characterized by FT-IR and SEM.pHpzcof the hybrid membranous adsorbent determined by pH drift method was 9.4.

关 键 词：层状氢氧化镁铁 膜吸附材料 除氟 水处理 

分 类 号：TB333[一般工业技术—材料科学与工程] X52[环境科学与工程—环境工程]