首页|Efficient removal of chlorophenols from water with a magnetic reduced graphene oxide composite

Efficient removal of chlorophenols from water with a magnetic reduced graphene oxide composite

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A magnetic reduced graphene oxide composite (MRGO) was successfully prepared by a simple and green method.MRGO was then used as an adsorbent and found to exhibit enhanced removal efficiency for various chlorophenols (CPs) from water compared with its precursors,graphene oxide (GO) and reduced graphene oxide.The CPs were o-chlorophenol,p-chlorophenol,2,4-dichlorophenol,and 2,4,6-trichlorophenol.Among them,2,4,6-trichlorophenol,which exhibited the lowest water solubility and highest molecular weight,most easily bound to MRGO.The preferential interactions between MRGO and CPs were hydrophobic interactions (π-π stacking and hydrophobic effect).This result was confirmed by the equilibrium adsorption behavior in which isotherms were all well described by Freudlich model,indicating heterogeneous and multilayer adsorption.Therefore,CP adsorption was more favored under neutral and acidic conditions,and the decreased removal efficiency of MRGO at higher pH levels was due to the improved hydrophilicity of CPs for deprotonation effect.Moreover,MRGO showed fast removal of each CP,achieving adsorption equilibrium within 10.0 min,presented efficient separation from water under an external magnetic field,and was easily regenerated using dilute NaOH aqueous solution after reaching saturated adsorption.Adsorption capacity of the regenerated MRGO had almost no loss until after five cycles.In summary,MRGO was an efficient adsorbent for the removal of various CPs and had considerable application potential in water treatment.

magnetic reduced graphene oxide compositegreen preparation methodchlorophenoladsorption mechanism

Han Yan、Qing Du、Hu Yang、Aimin Li、Rongshi Cheng

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State Key Laboratory of Pollution Control and Resource Reuse

School of the Environment, School of Chemistry and Chemical Engineering,Nanjing University, Nanjing 210023, China

This work was supported by the National Natural Science Foundation of ChinaThis work was supported by the National Natural Science Foundation of China

5143800851378250

2016

10.1007/s11426-015-5482-y

中国科学:化学(英文版)
中国科学院

中国科学:化学(英文版)

CSCDSCIEI
影响因子：0.629
ISSN：1674-7291
年,卷(期)：2016.59(3)
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