化工学报2017，Vol.68Issue(4)：1712-1720,9.DOI:10.11949/j.issn.0438-1157.20161497
氧化程度对氧化石墨烯吸附亚甲基蓝性能的影响
Influence of oxidation degree of graphene oxide on adsorption performance for methylene blue
摘要
Abstract
Graphene oxide (GOs) with different oxygen-containing functional groups was prepared by adjusting the amount of oxidant KMnO4. The effects of KMnO4 dosage on the structural characteristics, the type and content of the functional groups of GOs were analyzed by XRD, XPS, AFM and FTIR, and the performance of GOs on methylene blue (MB) were studied. The results indicated that KMnO4 dosage has a significant effect on the oxidation degree of GOs-n (n= 2, 3, 4), the maximum saturated adsorption capacity of MB+ was 728.44、965.63 and 807.29 mg·g?1, compared with Langmuir model fitted values of single molecular layer saturated adsorption capacity of standard deviation was 3.6%, 3.7% and 4.2%, respectively. Pseudo-second-order kinetic model could better describe the dynamic process of adsorption, andR2> 0.99, which based on GOs structure on the most abundant hydroxyl (—C—O?) and carboxyl (—COO?) as the main active sites with MB+ occur single molecular layer, exothermic and chemical speed control process. Adsorption heat was between 20—27 kJ·mol?1, and adsorption mechanism was dominated by ion exchange adsorption. Adsorption performance was positively correlated with the total amount of—C—O? and—COO? in GOs structure. Effects of epoxy groups and carbonyl groups on the adsorption capacity of MB by hydrogen bonding become prominent with increasing the extent of oxidation.关键词
氧化石墨烯/含氧官能团/动力学/热力学/MB吸附Key words
graphene oxide/oxygen-containing functional groups/kinetics/thermodynamics/methylene blue adsorption分类
化学化工引用本文复制引用
王泉珺,孙红娟,彭同江,岳焕娟..氧化程度对氧化石墨烯吸附亚甲基蓝性能的影响[J].化工学报,2017,68(4):1712-1720,9.基金项目
国家自然科学基金项目(41272051,U1630132) （41272051,U1630132）
西南科技大学博士基金项目(11ZX7135).supported by the National Natural Science Foundation of China (41272051, U1630132) andtheDoctor Foundation of Southwest University of Science and Technology(11ZX7135). （11ZX7135）
