摘要
石墨烯量子点(GQDs)作为新兴的零维石墨烯衍生物,与二维材料氧化石墨烯相比,具有尺寸更小、比表面积更大、亲水性更强等优势,作为膜分离材料近年来备受关注。分别以柠檬酸、木质素磺酸钠、葡萄糖为前体,采用一步水热法成功合成出GQD并组装成GQDs复合膜,系统探究了三种前体对GQDs复合膜的微观结构和渗透汽化脱盐性能的影响。采用UV-Vis、FTIR、XRD、TEM等表征手段对膜的结构和形貌进行了分析,结果表明:不同前体会影响GQDs的粒径大小和膜层间距d-spacing值,从而影响GQDs复合膜的表面微观结构和渗透汽化脱盐性能。三种前体中以柠檬酸为前体制备的CA-GQDs复合膜的脱盐性能最佳,30℃在3.5%(质量分数)NaCl溶液中优化制备的CA-GQDs复合膜的渗透通量高达37.36 kg·m^(-2)·h^(-1)(渗透率高达1.2×10^(-4)mol·m^(-2)·s^(-1)·Pa^(-1)),盐截留率近乎100%。此外,该复合膜在进料液pH=2~12具有较好的耐酸碱稳定性,尤其是pH=8~11时盐截留率仍保持99.95%以上。
Graphene quantum dots(GQDs),as an emerging 0D graphene derivative,have the advantages of smaller size,larger specific surface area and stronger hydrophilicity than 2D graphene oxide,which have attracted much attention as membrane separation materials in recent years.Three different serials of GQDs and assembling GQDs composite membranes were successfully prepared by one-step hydrothermal method with three different precursors:citric acid,sodium lignosulfonate and glucose.The influence of these three precursors on the microstructure and pervaporation desalination performance of GQDs composite membranes was systematically investigated.The particle sizes and d-spacing of GQDs were confirmed to be affected with these three precursors by various characterizations of UV-Vis,FTIR,XRD,and TEM,which could significantly influence surface microstructure and their desalination performance of these GQDs composite membranes.Among these three serials membranes,CAGQDs composite membranes prepared with citric acid as the precursor exhibited the highest desalination performance.The CA-GQDs composite membrane optimized and prepared in 3.5%(mass)NaCl solution at 30℃has a permeation flux of up to 37.36 kg·m~(-2)·h~(-1)(permeance is as high as 1.2×10~(-4)mol·m~(-2)·s~(-1)·Pa~(-1)),and the salt rejection rate is nearly 100%.In addition,the composite membrane has good acid and alkali resistance in the range of feed liquid pH=2 to 12,especially when the salt rejection rate remains above 99.95%at pH=8—11.
作者
陈佩佩
汪秋英
肖泽卿
周思佳
张小亮
CHEN Peipei;WANG Qiuying;XIAO Zeqing;ZHOU Sijia;ZHANG Xiaoliang(College of Chemistry and Chemical Engineering,Jiangxi Normal University,Nanchang 330022,Jiangxi,China)
出处
《化工学报》
EI
CSCD
北大核心
2023年第12期5006-5015,共10页
CIESC Journal
基金
国家自然科学基金项目(22268021,21766011)
江西省自然科学基金项目(20232ACB203020)
江西省主要学科学术和技术带头人培养计划项目(20204BCJL22042)。
关键词
石墨烯量子点
膜
前体
渗透汽化
脱盐
稳定性
graphene quantum dots
membrane
precursors
pervaporation
desalination
stability
