Abstract
The discharge of oily wastewater and oil spills at sea are the current difficulties in water pollution control. This problem often leads to terrible disasters. Therefore, the effective realization of oil-water separation is a very challenging problem. Superhydrophobic sponge is a promising oil-absorbing material. In this article, we reported a superhydrophobic sponge with nano-Fe3O4 for oil-water separation. The addition of nano-Fe3O4 allows the sponge to be recycled under the action of magnetic force. The sponge has the advantages of low cost, simple preparation and efficient oil-water separation. This kind of sponge is very worthy of promotion for the treatment of oily wastewater and marine oil spill accidents.
Highlights
Behind today’s rapid social and economic development is a large amount of industrial production and oily wastewater discharged from daily life [1,2,3]
In formula (2): R is the oil-water separation efficiency, %; C is the initial mass of the oil phase, g; C1 is the mass of the oil-water mixture before separation, g; C2 is the mass of the oil-water mixture after separation, g
MS itself contains a large amount of hydrophilic amino groups, so MS cannot be used for oil-water separation
Summary
Behind today’s rapid social and economic development is a large amount of industrial production and oily wastewater discharged from daily life [1,2,3]. Traditional oil-water separation methods mainly include flocculation [12], chemical degradation [13], biological filtration [14,15], etc These methods have exposed the shortcomings of low separation efficiency, poor recyclability, and insufficient environmental protection in the face of increasingly severe oil pollution problems. The dip coating method has the characteristics of economy, environmental protection, high efficiency and simplicity It is a hotspot method used in the preparation of hydrophobic and oil-absorbing materials in recent years [16,17]. The polyurethane sponge will produce toxic smoke when it burns These two shortcomings determine that the polyurethane sponge cannot achieve the purpose of environmental protection and high efficiency in the application of oil-water separation [21]. Melamine sponge (Suzhou Huanxi Electronic Materials Co., Ltd., Suzhou, China), nano-Fe3O4 (20nm 99.0% metals basis, Aladdin Reagent Co., Ltd., Shanghai, China), absolute ethanol (Tianjin Kaitong Chemical Reagent Co., Ltd., Tianjin, China), dopamine hydrochloride (Shanghai Maclean Biochemical Technology Co., Ltd., Shanghai, China), cyclohexane (AR, Tianjin Komeo Chemical Reagent Co., Ltd., Tianjin, China), PDMS (Polydimethylsiloxane, Dow Corning, Midland, MI, USA), curing agent (Dow Corning)
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