Adsorption of Ag(I) ions from wastewaters using poly(2-aminothiazole): kinetic and isotherm studies
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Adsorption of Ag(I) ions from wastewaters using poly(2‑aminothiazole): kinetic and isotherm studies Mutluhan Bıyıkoğlu1 · Hakan Çiftçi2 Received: 27 June 2019 / Revised: 7 December 2019 / Accepted: 13 December 2019 © Springer-Verlag GmbH Germany, part of Springer Nature 2019
Abstract In this study, 2-aminothiazole, (2AT), was polymerized with benzoyl peroxide in 1,4-dioxane solution, and adsorption efficiencies of poly(2-aminothiazole), P-2AT, for the Ag(I) ions to remove from the aqueous solutions were investigated. Adsorption experiments were studied at different pH, contact time and initial Ag(I) ion concentration in a batch system. The optimal pH for Ag(I) adsorption onto P-2AT was found to be 5.0, and the maximum adsorption capacity was determined to be 336.98 mg/g for 1200 mg/L Ag(I) solution at 90 min. P-2AT adsorbents were followed up by recycling in multiple adsorption cycles. The results showed that adsorbent can be used several times. Ag(I) ion adsorption performance of the P-2AT was investigated in conjunction with Cu(II) and Zn(II) ions. The selectivity series of ions were found as Ag(I) > Cu(II) > Zn(II). According to the experimental data, the adsorption reaction fitted the pseudo-second-degree kinetic model and the Langmuir isotherm equation. Keywords Poly(2-aminothiazole) · Ag(I) · Adsorption · Wastewater · Kinetics · Isotherms
Introduction For several decades, water pollution has been increased by the organic pollutants and toxic heavy metal ions. Toxic heavy metal ions, such as Ag(I), Cu(II), Cd(I), Hg(II), Pb(II), Ni(II) and As(III), are the main metal ion pollutants in water [1–5]. These heavy metals are very hazardous because of their solubility. They can easily transmit to plants, animals and humans, respectively. These metals can lead to serious health problems in * Mutluhan Bıyıkoğlu [email protected] 1
Department of Chemistry, Faculty of Art and Sciences, Kırıkkale University, 71450 Yahşihan, Kirikkale, Turkey
2
Department of Chemistry and Chemical Processing Technologies, Kırıkkale Vocational High School, Kırıkkale University, 71450 Yahşihan, Kirikkale, Turkey
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brain, liver, kidney, and nervous systems [6]. Thus, removing the toxic heavy metals from water and wastewaters is an important topic for health. Silver is a valuable metal for jewelry, photographic, electrical, electronics and chemical industries. Silver is very soft and antibacterial, and it has great properties such as malleability, electrical and thermal conductivity and photosensitivity [1, 7–9]. But silver pollution has been a serious problem with the growth of electroplating, medicine and chemical engineering [9]. The silver ions can be increased in organisms by the foods and can be harmful to human body due to their toxicity [9]. So, both recovery and removal of silver ions from water and wastewaters are an important concern for the researchers [8, 10–12]. Chemical precipitation [13, 14], electrolysis [15], solvent extraction [16], ionexchange [17], nanofilt
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