Preparation of Reduced Graphene Oxide-based Melamine Sponge and Its Absorption Properties†

doi:10.7503/cjcu20140476

Abstract

Abstract:

Graphene oxide(GO) was synthesized via the Hummers method and ultrasonic stripping method using the natural graphite as raw materials. Furtherly, reduced graphene oxide-based melamine sponges(RGOME) were fabricated via a dip-coating method which were post-reduced online. As-prepared RGOME sponges were investigated by scanning electron microscopy(SEM), Fourier transform infrared spectroscopy(FTIR) and optical contact angle measuring apparatus. Oil adsorption capacity, the oil/water selective adsorption and reusability of the RGOME sponges were also studied. The results demonstrate that the RGOME sponges exhibit good hydrophobicity and superoleophilicity, and oil adsorption capacity is up to 56—127 g/g. The adsorptive process of oils, like toluene and kerosene, was fitted to the Bangham equation for the isothermal adsorption. In terms of selective adsorptive process, the concentration of oil in oil-water mixture decreased drastically, while oil adsorption capacity constantly increased. The resulting separation efficiency was up to 74.49%, and as-prepared sponges have better performance for oil/water separation than other sorbents reported in the literature. In addition, the RGOME sponges can be reused more than 10 times with gently deteriorating in adsorption capacity.

Key words: Reduced graphene oxide-based melamine sponge, Adsorption property, Oil/water separation, Hydrophobicity and superoleophilicity

CLC Number:

O647

TrendMD:

WANG Zitao, XIAO Changfa, ZHAO Jian, HU Xiao, XU Naiku. Preparation of Reduced Graphene Oxide-based Melamine Sponge and Its Absorption Properties^†[J]. Chem. J. Chinese Universities, 2014, 35(11): 2410.

Figures/Tables 11

References 40

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Sorbent	Oil	Q/(g·g^-1)	Ref.	Sorbent	Oil	Q/(g·g^-1)	Ref.
RGOME	Toluene	69.8	This paper	Polypropylene nonwoven	Diesel	<8	[9]
	Trichloroethylene	127.0	This paper	Copolymerization of methyl	Toluene	<9	[8]
	Kerosene	59.3	This paper	acrylate fiber	Trichloroethylene	<21	[8]
Cotton grass fiber	Gasoline	20	[3]	Exfoliate graphite	Heavy oil	75	[38]
Corn stalk	Gasoline	8	[37]	Carbon aerogel	Toluene	130	[39]
Modified PU foam	Toluene	62	[5]		Chloroform	110	[39]
	Kerosene	47	[5]	Spongy graphene	Toluene	55	[19]
Polypropylene nonwoven	Toluene	<8	[9]		Kerosene	45	[19]

Sorbent	Oil	Q/(g·g^-1)	Ref.	Sorbent	Oil	Q/(g·g^-1)	Ref.
RGOME	Toluene	69.8	This paper	Polypropylene nonwoven	Diesel	<8	[9]
	Trichloroethylene	127.0	This paper	Copolymerization of methyl	Toluene	<9	[8]
	Kerosene	59.3	This paper	acrylate fiber	Trichloroethylene	<21	[8]
Cotton grass fiber	Gasoline	20	[3]	Exfoliate graphite	Heavy oil	75	[38]
Corn stalk	Gasoline	8	[37]	Carbon aerogel	Toluene	130	[39]
Modified PU foam	Toluene	62	[5]		Chloroform	110	[39]
	Kerosene	47	[5]	Spongy graphene	Toluene	55	[19]
Polypropylene nonwoven	Toluene	<8	[9]		Kerosene	45	[19]

Oil	Pseudo-first-order kinetic equation			Pseudo-second-order kinetic equation			Bangham equation
Oil	Q_e/(g·g^-1)	K₁/s^-1	R²	Q_e/(g·g^-1)	K₂/s^-1	R²	Q_e/(g·g^-1)	K₃/s^-1	z	R²
Toluene	68.42	0.3726	0.9880	72.93	0.0089	0.9966	69.86	0.5304	0.6853	0.9980
Kerosene	53.24	0.3140	0.9929	57.00	0.0092	0.9824	53.66	0.3820	0.8475	0.9955

Oil	Pseudo-first-order kinetic equation			Pseudo-second-order kinetic equation			Bangham equation
Oil	Q_e/(g·g^-1)	K₁/s^-1	R²	Q_e/(g·g^-1)	K₂/s^-1	R²	Q_e/(g·g^-1)	K₃/s^-1	z	R²
Toluene	68.42	0.3726	0.9880	72.93	0.0089	0.9966	69.86	0.5304	0.6853	0.9980
Kerosene	53.24	0.3140	0.9929	57.00	0.0092	0.9824	53.66	0.3820	0.8475	0.9955

Oil	Q_e(Theoretical value)/(g·g^-1)	Q_e(Experiment value)/(g·g^-1)	Relative error(%)
Toluene	68.42	69.77	1.9
Kerosene	53.24	53.82	1.0