Cost-Effective Reduced Graphene Oxide-Coated Polyurethane Sponge As a Highly Efficient and Reusable Oil-Absorbent

Abstract

The present work describes the fabrication of superhydrophobic and superoleophilic reduced graphene oxide-coated cotton (rGO@cotton) by a facile one-step hydrothermal used method for oil-water separation. Results from X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), and field emission scanning electron microscopy (FESEM) analysis show the formation of a composite structure with the presence of an ultrathin coating of rGO on the cotton fibers. The contact angle (CA) between a static water droplet and the rGO@cotton surface in air was measured ~ 162.9°, which suggests the formation of a superhydrophobic surface on the synthesized product. Moreover, the rGO@cotton showed excellent absorption capacity for oils where 1 g of rGO@cotton was able to remove ~ 30-40 g of various oils in the first cycle from oil-water mixtures. The flexible rGO@cotton was reusable and demonstrated oil retention up to ~ 35-50% at the tenth cycle using simple sorption-mechanical squeezing test. Overall, the present work identifies that the rGO@cotton is an efficient absorbent for effective separation of oil from oil-water mixtures.

Polymeric Sorbents for the Collection of Oil and Oil Products from the Surface of Reservoirs: a 2000–2017 Review of the English-language Literature (Part 2)

“…Авторы [12] покрывали полиуретановые губ-ки оксидом графена. Они являются гидрофобны-ми и олеофильными, что обусловливает высокую абсорбцию органических жидкостей.…”

“…Так, мак-симальная сорбционная ёмкость в данной части обзора составляла 163 г/г (супергидрофобная силанизированная меламиновая губка [13]), но это сорбция хлороформа. Следующая за ней величина, 160 г/г (полиуретановая губка, по-крытая оксидом графена [12]), также относится к хлороформу. Наибольшая сорбция, относящаяся именно к нефти, составляет 158 г/г (UFC-пена на основе полимеламин-формальдегидных пенома-териалов [14]).…”

3D white graphene foam scavengers: vesicant-assisted foaming boosts the gram-level yield and forms hierarchical pores for superstrong pollutant removal applications

“…To more quantitatively evaluate the adsorption capacity of 3D WG foams, several recently reported excellent sorbents and commercial activated carbon powders were adopted for comparison, as shown in Figure 5c. Taking the adsorption of pump oil as an example, the adsorption capacity (115 g g − 1 ) of the 3D WG foams was higher than all of these competitors, including BN porous nanosheets (27 g g − 1 ), 36 graphene aerogels (30 g g − 1 ), 14 graphene sponges (68.5 g g − 1 ) 8 and graphene oxide-polyurethane sponges (100 g g − 1 ) 16 (see Supplementary Table S1). Compared with commercial BN and active carbon powders, the adsorption capacity Recyclability, the important characteristic of sorbents, was tested for these 3D WG foams, as shown in Figure 5d and e. After 7 test cycles and heat treatments at 100°C, the adsorption capacities of the 3D WG foams still remained 490% toward both chloroform and ethanol.…”

“…More importantly, the artificial and poor connections among the 2D crystals usually degrade the electrical and thermal transport inside such 3D structures. [13][14][15][16] To achieve naturally integrated 3D networks, a second method was recently developed. 17 Chen et al 10 reported the chemical vapor deposition growth of porous graphene 3D structures with nickel foam as a catalyst and 3D template.…”

Preference of Nano porous graphene to Single-Walled Carbon Nanotube (SWCNT) for preparing Silica Nano hybrid Pickering Emulsion for potential Chemical Enhanced Oil Recovery (C-EOR)

“…Therefore, GO has an amphiphile surface with hydrophilic edges and hydrophobic plane [17]. In addition, GO has many applications such as catalytic supports for chemical reactions [18,19], adsorption [20,21], and separation of pollutants [22].…”