Removal of Rhodamine B from Water Using a Solvent Impregnated Polymeric Dowex 5WX8 Resin: Statistical Optimization and Batch Adsorption Studies

Abstract

Herein, commercially available Dowex 5WX8, a cation exchange polymeric resin, was modified through solvent impregnation with t-butyl phosphate (TBP) to produce a solvent impregnated resin (SIR), which was tested for the removal of rhodamine B (RhB) from water in batch adsorption experiments. The effect of SIR dosage, contact time, and pH on RhB adsorption was studied and optimized by response surface methodology (RSM), interaction, Pareto, and surface plots. Scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) were respectively used for characterizing SIR surface morphology and identifying active binding sites before and after RhB adsorption. SEM showed that the pristine SIR surface was covered with irregular size and shape spots with some pores, while RhB saturated SIR surface was non-porous. FTIR revealed the involvement of electrostatic and π–π interactions during RhB adsorption on SIR. Dosage of SIR, contact time, and their interaction significantly affected RhB adsorption on SIR, while pH and its interaction with dosage and contact time did not. The optimum identified experimental conditions were 0.16 g of SIR dose and 27.66 min of contact time, which allowed for 98.45% color removal. Moreover, RhB adsorption equilibrium results fitted the Langmuir isotherm with a maximum monolayer capacity (qmax) of 43.47 mg/g.

Removal of Boron and Manganese Ions from Wet-Flue Gas Desulfurization Wastewater by Hybrid Chitosan-Zirconium Sorbent

“…The energy for chemisorption lies in the range between 40 and 800 kJ/mol [48]. As can be seen in Figure 1a and Table 2, the Langmuir model gave the best fit to the experimental data of boron adsorption on hybrid chitosan-zirconium hydrogel beads; the highest correlation coefficient, R 2 = 0.992, and the smallest mean error, ME = 2.85%, were obtained at 25 • C. The very good applicability of the Langmuir isotherm at 25 • C suggested the monolayer coverage of boron molecules on the surface of hybrid chitosan-zirconium hydrogel where the active sites and energies were homogenously distributed [49,50]. The maximum adsorptive capacity was equal to 2 mg/g, which was in good agreement with the experimental value.…”

Preparation and Characterization of a New Polymeric Multi-Layered Material Based K-Carrageenan and Alginate for Efficient Bio-Sorption of Methylene Blue Dye

“…In this sense, several polymeric adsorbents were used for the removal of dyes from contaminated matters [ 10 , 11 , 12 ]. Concerning textile adsorbent materials, they are rarely investigated in the literature.…”

Adsorption Evaluation for the Removal of Nickel, Mercury, and Barium Ions from Single-Component and Mixtures of Aqueous Solutions by Using an Optimized Biobased Chitosan Derivative

“…The main methods for the metal ions uptake from industrial wastewaters are reverse osmosis, solvent extraction, ion exchange, chemical precipitation, membrane filtration, electrolytic methods, and adsorption [ 16 , 17 , 18 ]. However, these techniques have high operational cost and in the case of trace level concentrations may be ineffective for the adsorption of some types of toxic metal ions [ 16 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Therefore, a candidate facing the heavy metal ions pollutions is the use of adsorption technology [ 35 , 36 , 37 , 38 , 39 ], and specifically by using chitosan as an adsorbent.…”