Abstract
To facilitate the recycling and reuse of cigarette filters and oil/water separation, a superhydrophobic cigarette filter was made by coating with dodecanethiol-modified polypyrrole (Ppy) particles by a dip-coating method. SEM, FTIR, and XPS were used to analyze the surface morphology and chemical compositions. The as-prepared superhydrophobic cigarette filter can realize wettability alteration via changing the ammonium persulfate (APS) concentration from 0.15 mol/L to 3 mol/L, and the contact angle increased from 0° on the original cigarette filter to 155° with a sliding angle of 5°. The superhydrophobic cigarette filter could effectively separate various oils and organic solvents. The separation efficiency was 98.8% and the separation stability was good. Furthermore, the as-prepared superhydrophobic cigarette filter had a large oil absorption range and could absorb different oils and organic solvents, including petroleum ether, engine oil, vegetable oil, n-hexane, and chloroform, with maximum absorption capacities ranging from 9.4 g/g to 22.7 g/g. According to the above results, we believe that the as-prepared superhydrophobic cigarette filter should have great potential in the recovery of solid waste and high-efficiency oil/water separation.
Highlights
With the continuous development of industrialization, the demand for oil is increasing [1,2].From oil extraction, refining, storage, and transportation to industrial use, these processes inevitably produce a large amount of oil/water mixture waste [3,4]
We demonstrated a simple method to prepare cigarette filters capable of oil separation
We demonstrated a simple method to prepare cigarette filters capable of oil and absorption
Summary
With the continuous development of industrialization, the demand for oil is increasing [1,2]. Qiao et al [21] fabricated graphene-based superhydrophobic sponges for oil/water separation, which showed excellent absorption properties for various oils and organic contaminants. The as-prepared superhydrophobic cigarette filters exhibited excellent water repellency with a water contact water of 155◦ , highly efficient oil separation ability, separation stability, and great absorption capacity; the superhydrophobic Ppy-coated cigarette filter absorbed oils and organic solvents with absorption capacities 9.4–22.7 times the filter’s mass. This result shows that the superhydrophobic cigarette filters can effectively separate oil/water mixtures and promote waste recycling and environmental protection
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