Nanoporous graphene and graphene oxide-coated polyurethane sponge as a highly efficient, superhydrophobic, and reusable oil spill absorbent

Rafiee, Zahra; Samadi, M T; Kazemi, Abolghasem; Rashidi, Alimorad; Rahmani, Ali Reza

doi:10.1016/j.jece.2017.09.028

Cited by 52 publications

(20 citation statements)

References 41 publications

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“…Prior to surface modification, PU foam exhibits higher absorption capacity towards hydrocarbon (i.e., chloroform, acetone, and cyclohexane) than edible oil. Such a phenomenon is ascribed to the lower viscosity of hydrocarbon (see Table 3 ) that allows it to diffuse at a faster rate into the PU foam than oil [ 8 , 18 ]. Because of this reason, PU foam swells rapidly upon contact with organic solvents.…”

Section: Resultsmentioning

confidence: 99%

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A Green Approach to Modify Surface Properties of Polyurethane Foam for Enhanced Oil Absorption

Roslan

Lau

et al. 2020

Polymers

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The non-selective property of conventional polyurethane (PU) foam tends to lower its oil absorption efficiency. To address this issue, we modified the surface properties of PU foam using a rapid solvent-free surface functionalization approach based on the chemical vapor deposition (CVD) method to establish an extremely thin yet uniform coating layer to improve foam performance. The PU foam was respectively functionalized using different monomers, i.e., perfluorodecyl acrylate (PFDA), 2,2,3,4,4,4-hexafluorobutyl acrylate (HFBA), and hexamethyldisiloxane (HMDSO), and the effect of deposition times (1, 5 and 10 min) on the properties of foam was investigated. The results showed that all the modified foams demonstrated a much higher water contact angle (i.e., greater hydrophobicity) and greater absorption capacities compared to the control PU foam. This is due to the presence of specific functional groups, e.g., fluorine (F) and silane (Si) in the modified PU foams. Of all, the PU/PHFBAi foam exhibited the highest absorption capacities, recording 66.68, 58.15, 53.70, and 58.38 g/g for chloroform, acetone, cyclohexane, and edible oil, respectively. These values were 39.19–119.31% higher than that of control foam. The promising performance of the PU/PHFBAi foam is due to the improved surface hydrophobicity attributed to the original perfluoroalkyl moieties of the HFBA monomer. The PU/PHFBAi foam also demonstrated a much more stable absorption performance compared to the control foam when both samples were reused for up to 10 cycles. This clearly indicates the positive impact of the proposed functionalization method in improving PU properties for oil absorption processes.

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Section: Resultsmentioning

confidence: 99%

“…This test was conducted to reaffirm the hydrophobicity of modified PU foam. The porosity of foams was determined using the saturation method [ 18 ]. The dry weight of each PU foam (dimension: 1 cm × 1 cm × 1 cm) was first recorded prior to dropping the foam into a beaker containing 100 mL of edible oil.…”

Section: Methodsmentioning

confidence: 99%

A Green Approach to Modify Surface Properties of Polyurethane Foam for Enhanced Oil Absorption

Roslan

Lau

et al. 2020

Polymers

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“…The FTIR spectra of GO precursor and rGO samples are also shown in Figure 2(b). After the reaction of GO precursor, the absorption bands of some the oxygen-functional groups, such as, hydroxyl (-OH), carbonyl (-C=O) and epoxy (-C-O) were mostly removed [6,9]. This result indicated that the GO precursor was produced to rGO over the reduction method.…”

Section: Recyclabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…To solve these problems, the modifications of the polymer sponges are to be needed [7][8][9]. Recently, reduced graphene oxide (rGO), a single-atom thick with a two-dimensional (2D) carbon nanomaterial, has attracted a great interest due to its unique large surface area, excellent hydrophobicity, thermal and chemical stability, good flexibility and very lightweight [9][10]. In general, rGO can be synthesized from graphene oxide (GO) using both thermal and chemical reduction processes, but the later has some drawbacks in the case of use a several toxic reductants, for example, hydrazine (N 2 H 4 ) and sodium borohydride (NaBH 4 ) [11][12].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Graphene Oxide Precursor Loading on the Surface of Melamine-Formaldehyde/rGO Sponge with Enhanced Ultra-Hydrophobicity for Oils Removal

Jirasuttisarn¹,

Sriwong²

2020

NANO

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This work presented a facile, green and effective method to prepare the ultra-hydrophobic melamine-formaldehyde (MF) sponge loaded with reduced graphene oxide (rGO) by a conventional heating method using the various contents of graphene oxide, GO (1, 3, 5, 10 and 15 mg) precursor, and vitamin C as a reducing agent. These GO precursors were used to increase the roughness of the MF/rGO sponge surfaces. Then GO precursor, rGO, pristine MF sponge and as-prepared MF/rGO sponge samples were confirmed and characterized by Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and water contact angle techniques. Moreover, the adsorption capacity, oils removal performance and recyclability of MF/rGO sponges were also investigated. The results showed that the water contact angle values were increased from 131° to 144.1° upon the increasing of GO precursor loading. The highest water contact angle (144.1°) exhibited the ultra-hydrophobic property by the sponge prepared using GO loading as 10 mg (MF/rGO-10 mg). The adsorption capacity (Q e) of the MF/rGO-10 mg sponge was higher than 102 g.g-1 for all the oils removal tested (palm oil, gasoline, diesel and lubricant oil), and had the highest value was about 112 g.g-1 for lubricant oil. Besides, MF/rGO sponge can be well-recycled use up to 10 times for all oils removal. Therefore, this study provides a new alternative method to prepare the MF sponge loaded with rGO (MF/rGO), which can be used and reused for the cleanup of oil spillages from water.

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Advancement in Material Coating for Engineering Applications

Ibrahim

Sadiku

Hamam

et al. 2019

Photoenergy and Thin Film Materials

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Nanoporous graphene and graphene oxide-coated polyurethane sponge as a highly efficient, superhydrophobic, and reusable oil spill absorbent

Cited by 52 publications

References 41 publications

A Green Approach to Modify Surface Properties of Polyurethane Foam for Enhanced Oil Absorption

A Green Approach to Modify Surface Properties of Polyurethane Foam for Enhanced Oil Absorption

Effect of Graphene Oxide Precursor Loading on the Surface of Melamine-Formaldehyde/rGO Sponge with Enhanced Ultra-Hydrophobicity for Oils Removal

Advancement in Material Coating for Engineering Applications

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