Abstract
Modifying environmentally harmful waste polystyrene foam as an efficient recyclable adsorbent for organic dyes is important. Amidation modified polystyrene (PS-SD) was prepared by the Friedel-Crafts reaction and N,N'-dicyclohexylcarbodiimide (DCC) dehydration condensation reaction of waste polystyrene foam. PS-SD had highly efficient removal performance for organic dyes in large volume water sample solutions, and equilibrium was achieved in 0.5 h. The maximum adsorption capacities for Methylene blue (MB) and Congo red (CR) were 881.62 and 1,880.91 mg/g, respectively, at room temperature according to the Langmuir adsorption isotherm (R2 > 0.99). The kinetic data of the two dyes followed pseudo-second-order kinetics. The removal percentage remained high (>85%) after eight filtration-regeneration cycles. Experimental results showed that PS-SD was an excellent adsorbent for water treatment with high recyclability and long life.
Highlights
Considerable organic dye wastewater is discharged directly without treatment, which has caused a sharp increase in the types and content of existing pollutants in water bodies (Chan et al ; Wang et al b; Cheng et al ; Roy et al )
The specific surface area was calculated from the N2 adsorption isotherm by using the Branauer-Emmett-Teller (BET) model, and the pore size distribution was determined by using the BarrettJoyner-Halenda (BJH) model
The result indicated that polystyrene resin (PS)-SD had an abundant mesoporous structure, as further confirmed by the pore size distribution
Summary
Considerable organic dye wastewater is discharged directly without treatment, which has caused a sharp increase in the types and content of existing pollutants in water bodies (Chan et al ; Wang et al b; Cheng et al ; Roy et al ). Key words | adsorption, amidation, organic dyes, recyclability, waste polystyrene foam
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