Abstract
For continuous and efficient oil/water separation and adsorption of dyes, coconut shell powder was grafted onto the surface of quartz sand by dip-coating method to make coconut shell powder-covered quartz sand filter media (CSQS) with superhydrophilic and underwater superoleophobic properties and superoleophilic and underoil highly hydrophobic properties. The contact angles of the underwater oil and underoil water with CSQS were more than 151.2° and 134.2°, respectively. A continuous oil/water separation device was designed. The separation device filled with CSQS can separate oil/water mixture (whether heavy or light oil) into water and oil at the same time with a separation efficiency of above 99.92%. The filter layer can be recovered through reverse extrusion even after lyophobic liquid penetrated the filter layer; hence, the separation efficiency of the filter layer was still above 99.99% for diesel and water mixture. Simultaneously, CSQS can effectively adsorb methylene blue with the highest removal rate as 98.94%. CSQS can maintain stable wettability under harsh environment conditions. This paper provides a new idea on continuous and efficient oil/water separation and simultaneous dye adsorption.
Highlights
The composition of wastewater discharge has become complex and diverse with the rapid development of industry and agriculture
Diesel oil was bought from a local gas station, rapeseed oil was bought from a local oil mill, and distilled water was prepared in the laboratory
Coconut shell is composed of cellulose, hemicellulose, and lignin
Summary
The composition of wastewater discharge has become complex and diverse with the rapid development of industry and agriculture. A large number of oil, water-soluble dyes, pesticides, and heavy metal pollutants will cause great harm to the environment if not effectively treated [1]. About 6 million tons of oil are discharged into the ocean every year because of crude oil leakage and pose a serious threat to microbial communities and marine organisms [2,3,4,5,6]. A large number of industrial oily wastewater is discharged into the water body and transferred to the food chain, which eventually affects public health. About 0.28 million tons of textile dyes are discharged into the water body through industrial wastewater every year and have led to the decrease in water transparency and oxygen solubility. A material that can remove oil and dyes in wastewater from different industries
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