Abstract
In this study, a poly(acrylonitrile-co-N-vinyl pyrrolidone)/zeolite (poly(AN-co-VP)/zeolite) composite was synthesized by in situ free radical polymerization (FRP). The structural properties of the composite were analyzed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and differential scanning calorimetry (DSC). The characterization results indicated that the composite had a homogeneous and 3-dimensional (3D) structure. The decomposition temperature and glass transition temperature (Tg) were found as 410°C and 152°C, respectively. A poly(AN-co-VP)/zeolite composite was used to investigate the adsorption of brilliant green (BG) which is a water-soluble cationic dye. The kinetics, isotherms, and thermodynamics of adsorption were examined, and results showed that equilibrium data fitted the Langmuir isotherm model, and the adsorption kinetics of BG followed pseudo-second-order model. According to the thermodynamic properties, the adsorption process was endothermic and spontaneous. Response surface methodology (RSM), which was improved by the application of the quadratic model associated with the central composite design, was employed for the optimization of the study conditions such as adsorbent mass, time, and initial dye concentration. The RSM indicated that maximum BG removal (99.91%) was achieved at the adsorbent mass of 0.20 g/50 mL, an initial BG concentration of 40.20 mg/L, and a contact time of 121.60 minutes.
Highlights
Water pollution, which is one of the most unfavorable environmental problems in the world, stems from many reasons
The intention of the present research is the synthesis and use of poly(AN-co-VP)/zeolite) composite to investigate the impact of three parameters: initial dye concentration, adsorbent mass, and contact time on the removal of the dye brilliant green (BG), using central composite design (CCD) which is a standard response surface methodology (RSM)
This study showed that the poly(VP-co-An)/zeolite composite prepared by free radical polymerization (FRP) is an effective adsorbent for the removal of BG from aqueous solutions
Summary
Water pollution, which is one of the most unfavorable environmental problems in the world, stems from many reasons. Ghaedi et al [23] synthesized the zinc sulfide nanoparticle loaded on activated carbon and examined BG removal percentage toward various parameters including pH, adsorbent dosage, initial dye concentration, and contact time. Poly(AN-co-VP)/zeolite composite was prepared firstly and showed efficient adsorption ability for BG. The intention of the present research is the synthesis and use of poly(AN-co-VP)/zeolite) composite to investigate the impact of three parameters: initial dye concentration, adsorbent mass, and contact time on the removal of the dye BG, using central composite design (CCD) which is a standard response surface methodology (RSM). RSM is the collection of statistical and mathematical tools and it was selected to explain the simultaneous effects of the parameters on the adsorption process [24,25,26]
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