Iron-Impregnated Weakly Basic Resin for the Removal of 2-Naphthalenesulfonic Acid from Aqueous Solution

Abstract

Commercial grade weakly basic resin D301 was impregnated with iron through a simple method using ferric chloride as the precursor for removing of 2-naphthalenesulfonic acid (2-NSA) from aqueous solution and sewage. The characteristics of the D301 before and after iron-impregnation were examined using scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy. The influences of pH, initial concentration of 2-NSA, contact time, temperature, and coexisting salts on the adsorptive removal of 2-NSA from aqueous solution by iron-impregnated resin D301 (Fe-D301) were studied by batch adsorption experiments. The adsorption of 2-NSA was found strongly affected by the pH, with pH 2.8 providing maximum adsorption of 2-NSA from aqueous solutions. Langmuir, Freundlich, RedlichÀPeterson, and Temkin isotherm models were applied to the experimental data. Thermodynamic parameters such as free energy, enthalpy, and entropy were calculated using van't Hoff equations, which showed that 2-NSA adsorption on Fe-D301 was spontaneous and exothermic. Column studies were conducted to examine the use of the adsorbent for the removal of 2-NSA from continuously flowing aqueous solutions. Fe-D301 synthesized in this study exhibited a higher affinity for 2-NSA and salt coexisting solution compared with references in literature and shows great potential in further field processes.

A comparative study on the adsorption of 8-amino-1-naphthol-3,6-disulfonic acid by a macroporous amination resin

“…The thermodynamic parameters for the adsorption of H-acid onto four resins at various temperatures are enumerated in Table 4. The negative DG value indicate that the adsorption of H-acid onto GMDA, NDA-88 and D-301 is spontaneous at 288, 303 and 318 K. The positive DH suggests that the adsorption reaction is endothermic surface reaction [29][30][31]. However, the adsorption capacity of H-acid increased a little with the increased temperature that may be affected by the principle of expansion and contraction and kinetic molecular theory.…”

An effective heterogeneous iron-based catalyst to activate peroxymonosulfate for organic contaminants removal

“…Various supports, such as clay [21], resin [22], zeolite [23], and activated carbon [24], have been used to prepare heterogeneous iron-based catalysts. Compared with these supports, activated carbon fibers (ACFs) represent a highly microporous carbon material with an extremely high adsorption capacity and a large surface area.…”

Adsorptive Bromate Removal from Aqueous Solution by Commercial Strongly Basic Resin Impregnated with Hydrated Ferric Oxide (HFO): Kinetics and Equilibrium Studies

“…Nevertheless, shorter equilibrium time (10 min) was found in adsorption of bromate by nanocrystalline akaganeite (β-FeOOH)-coated quartz sand (CACQS). This may be attributed to HFO-201 being a porous adsorbent and pore diffusion decreasing the adsorption rate . For the initial bromate concentrations of 200, 400, and 600 μg·L –1 , the adsorption capacities of bromate were 1023.02, 2009.23, and 2974.71 μg·g –1 , respectively.…”