Synthesis of citric acid functionalized magnetic graphene oxide coated corn straw for methylene blue adsorption.
The citric acid functionalized magnetic graphene oxide coated corn straw (CA-mGOCS) as a new adsorbent was synthesized in this work for the elimination of methylene blue (MB) from waste water. The as-prepared CA-mGOCS was tested by SEM, FTIR, XRD, Roman spectrum, TGA, particle size analyzer, BET and magnetic properties analyzer. Some factors affecting adsorption removal efficiency were explored. As a result, the addition of 5g CS (CA-mGO5CS) had the better adsorption performance than other adsorbents. The pseudo-second-order model and the Freundlich described the adsorption behavior well. The equilibrium adsorption capacity was 315.5mgg-1for MB at pH=12 and 298k. The electrostatic incorporation as well as hydrophobic interactions between CA-mGO5CS and MB determined the favourable adsorption property. Besides, the thermodynamic studies results ΔG<0, ΔH<0, ΔS<0 suggested that the adsorption was a spontaneous, exothermic and randomness decrease process. Finally, reusability studies imply that CA-mGO5CS has an excellent reproducibility.
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, PR China; School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China. Electronic address: geheyi@sina.com.
Heyi
H
Ge
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, PR China; School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China.
Cuicui
C
Wang
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, PR China; School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China.
Shanshan
S
Liu
Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, PR China; School of Material Science and Engineering, University of Jinan, Jinan 250022, PR China.
Zhen
Z
Huang
D000327:Adsorption; D006108:Graphite / Q000737:chemistry*; D008280:Magnetics; D008751:Methylene Blue / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis; D018508:Water Purification / Q000379:methods*; D003313:Zea mays / Q000737:chemistry*
D006108:Graphite; D008751:Methylene Blue; D010087:Oxides; D062065:Wastewater; D014874:Water Pollutants, Chemical
Adsorption isotherm; Adsorption kinetics; Citric acid; Corn straw; Magnetic graphene oxide