Adsorption of methylene blue from aqueous solution by graphene.
Graphene was prepared using a modified Hummers' method. The physico-chemical properties of graphene were characterized by TEM, BET specific surface area, FTIR, Raman and XRD measurements. The effect factors including pH, contact time, temperature and dosage on the adsorption properties of methylene blue onto graphene were investigated. The experimental data of isotherm followed the Langmuir isotherm model better than the Freundlich model. The maximum adsorption capacity obtained from Langmuir isotherm equation at 293 K was 153.85 mg/g, indicating graphene is a good adsorbent for the adsorption of MB. The kinetic study illustrated that the adsorption of methylene blue onto graphene fit the pseudo second-order model. The thermodynamic parameters indicated that the adsorption of methylene blue onto graphene was an endothermic and spontaneous process.
Laboratory of Fiber Materials and Modern Textile, The Growing Base for State Key Laboratory, Qingdao University, Qingdao, China.
Tonghao
T
Liu
Yanhui
Y
Li
Qiuju
Q
Du
Jiankun
J
Sun
Yuqin
Y
Jiao
Guangming
G
Yang
Zonghua
Z
Wang
Yanzhi
Y
Xia
Wei
W
Zhang
Kunlin
K
Wang
Hongwei
H
Zhu
Dehai
D
Wu
D000327:Adsorption; D006108:Graphite / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008751:Methylene Blue / Q000032:analysis / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D013696:Temperature; D013816:Thermodynamics; D014867:Water / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D014876:Water Pollution / Q000517:prevention & control*; D018508:Water Purification / Q000379:methods*; D014961:X-Ray Diffraction
D012996:Solutions; D014874:Water Pollutants, Chemical; D014867:Water; D006108:Graphite; D008751:Methylene Blue