TY - JOUR
T1 - Highly efficient removal of methylene blue from aqueous solution by a novel fishing-net effect of manganese oxide nano-sheets
AU - Peng, Liang
AU - Liu, Bin
AU - Zeng, Qingru
AU - Gu, Ji Dong
AU - Lei, Ming
AU - Shao, Jihai
AU - Chai, Liyuan
N1 - Publisher Copyright:
© 2016, Springer-Verlag Berlin Heidelberg.
PY - 2017/1
Y1 - 2017/1
N2 - Manganese (IV) oxide (MnO2) nano-sheets were synthesized using tetramethylamine, H2O2, and MnCl2·4H2O and used in suspension for removal of methylene blue (MB). Up to 95 % removal was achieved for MB concentrations less than 500 mg/L. The adsorption data fitted better with the Freundlich isotherm model than the Langmuir model, indicating a heterogeneous adsorption of MB on MnO2nano-sheets. The maximum adsorption capacity of MnO2nano-sheets was approximately 4300 mg/g, which is the highest yet reported. Suspensions of MnO2nano-sheets aggregated as precipitates after adsorption of MB. Using a suite of analyses, including X-ray diffraction and X-ray photoelectron spectroscopy, the high adsorption capacity was mainly attributed to ion exchange, coordination, and a fishing-net effect. The term, ‘fishing-net effect,’ is proposed here for the first time, to explain the extremely high adsorption capacity of nano-sheets, which increased with increasing ionic strength and sorbate concentration. Our results demonstrate that dispersive MnO2nano-sheets have a potential application in adsorption of organics from strongly basic solutions with high salinity.
AB - Manganese (IV) oxide (MnO2) nano-sheets were synthesized using tetramethylamine, H2O2, and MnCl2·4H2O and used in suspension for removal of methylene blue (MB). Up to 95 % removal was achieved for MB concentrations less than 500 mg/L. The adsorption data fitted better with the Freundlich isotherm model than the Langmuir model, indicating a heterogeneous adsorption of MB on MnO2nano-sheets. The maximum adsorption capacity of MnO2nano-sheets was approximately 4300 mg/g, which is the highest yet reported. Suspensions of MnO2nano-sheets aggregated as precipitates after adsorption of MB. Using a suite of analyses, including X-ray diffraction and X-ray photoelectron spectroscopy, the high adsorption capacity was mainly attributed to ion exchange, coordination, and a fishing-net effect. The term, ‘fishing-net effect,’ is proposed here for the first time, to explain the extremely high adsorption capacity of nano-sheets, which increased with increasing ionic strength and sorbate concentration. Our results demonstrate that dispersive MnO2nano-sheets have a potential application in adsorption of organics from strongly basic solutions with high salinity.
KW - Adsorption
KW - Manganese oxide
KW - Methylene blue
KW - Nano-sheet
UR - http://www.scopus.com/inward/record.url?scp=84973607446&partnerID=8YFLogxK
U2 - 10.1007/s10098-016-1214-z
DO - 10.1007/s10098-016-1214-z
M3 - 文章
AN - SCOPUS:84973607446
SN - 1618-954X
VL - 19
SP - 269
EP - 277
JO - Clean Technologies and Environmental Policy
JF - Clean Technologies and Environmental Policy
IS - 1
ER -