In this study, a polyethylenimine-aminated polyvinyl chloride fiber (PEI-PVCF) was prepared, which exhibited excellent adsorption properties for Reactive Black 5 (RB5) and Reactive Orange 16 (RO16) from single- and binary-component systems under neutral conditions. The pH edge, kinetic, isotherm, and thermodynamic experiments were conducted to evaluate the adsorption performance of PEI-PVCF for RB5 and RO16. The effect of coexisting ions on the removal of reactive dyes by PEI-PVCF was also investigated. The regeneration experiment was performed to evaluate the reusability of PEI-PVCF for reactive dyes removal. The results were as follows: The PEI-PVCF showed high removal efficiency for RB5 and RO16 in a wide range of pH (2?8). Kinetic modeling suggested that chemisorption plays an essential role in the adsorption process. The intraparticle diffusion model revealed that intraparticle diffusion was not the only rate-controlling step. The isotherm models showed that the adsorption of PEI-PVCF for RB5 and RO16 was monolayer adsorption, and the PEI-PVCF had a higher affinity for RB5 than RO16. The maximum adsorption capacities of PEI-PVCF for RB5 and RO16 calculated by the Sips model were 1265.0 and 1171.5?mg/g in single-component systems, and 932.3 and 473.4?mg/g in binary-component systems, respectively. Thermodynamic experiments results revealed that the adsorption process was exothermic. The adsorption mechanism study revealed that electrostatic interaction and H-bonding were the main mechanisms involved in the adsorption process. The inhibition effect of coexisting ions on the adsorption of RO16 by PEI-PVCF was more significant than that on RB5. In addition, the reusability study depicted that the PEI-PVCF can be reused at least five times. These results indicated that the PEI-PVCF has good potential in industrial applications.

» Author: Zhuo Wang, Su Bin Kang, Sung Wook Won

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