Abstract
In this study, the optimal conditions for the fabrication of polyethylenimine/polyvinyl chloride cross-linked fiber (PEI/PVC-CF) were determined by comparing the adsorption capacity of synthesized PEI/PVC-CFs for Reactive Yellow 2 (RY2). The PEI/PVC-CF prepared through the optimal conditions was characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) analyses. Several batch adsorption and desorption experiments were carried out to evaluate the sorption performance and reusability of PEI/PVC-CF for RY2. As a result, the adsorption of RY2 by PEI/PVC-CF was most effective at pH 2.0. A pseudo-second-order model fit better with the kinetics adsorption data. The adsorption isotherm process was described well by the Langmuir model, and the maximum dye uptake was predicted to be 820.6 mg/g at pH 2.0 and 25 °C. Thermodynamic analysis showed that the adsorption process was spontaneous and endothermic. In addition, 1.0 M NaHCO3 was an efficient eluent for the regeneration of RY2-loaded PEI/PVC-CF. Finally, the repeated adsorption–desorption experiments showed that the PEI/PVC-CF remained at high adsorption and desorption efficiencies for RY2, even in 17 cycles.
Highlights
The consumption of synthetic dyes has grown with the rapid development of human society
A variety of PEI/Polyvinyl chloride (PVC)-CFs fabricated at different mass ratios (PEI:PVC) and crosslinking times were evaluated through adsorption experiments in 500 mg/L of Reactive Yellow 2 (RY2) solution
The values of k2 and h decreased with an increasing pH value. These results show that, in the adsorption of RY2 by PEI/PVC-CF, the adsorption rate is affected by the pH of the dye solution and the adsorption rate decreases as the pH increases
Summary
The consumption of synthetic dyes has grown with the rapid development of human society. Up to 50% of azo dyes remain in the used dye bath, and they can discharge into the environment without appropriate treatment [3]. The direct emission of azo dye wastewater into the environment is a big threat to human beings as well as the ecosystem. Many azo dyes and their degradation products are toxic, mutagenic, and carcinogenic to humans [5]. The existence of dyes in the aquatic environment can prohibit the penetration of sunlight into the water, which influences the photosynthesis activities of aquatic plants, and eventually damages the whole aquatic ecosystem [6]. It is of great significance to remove dyes from the dye-baring wastewater before discharging them into the environment
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