Fouling of anion exchanger by image and FTIR analyses

Wiercik, Paweł; Frączek, Barbara; Chrobot, Przemysław

doi:10.1016/j.jece.2020.103761

Cited by 12 publications

(5 citation statements)

References 29 publications

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“…That is due to the divinylbenzene crosslink and the sulphonic groups. Resin Lewatit S-108 consists of characteristics for the polystyrene structure in a styrene-divinylbenzene matrix[12,16]. This spectrum is related toLazar et al (2014) and confirms that the Lewatit S-108 has polystyrene crosslinked with divinylbenzene and contains the sulfonic type[17].…”

supporting

confidence: 54%

Effectiveness and Isotherm Models of Lewatit Monoplus S-108 on Lithium Adsorption Process from Bledug Kuwu Brine with Continuous Flow

Rohmah¹,

Suharyanto²,

Lalasari³

et al. 2021

J. Kim. Sains Apl.

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Sorption of a series of alkali metals (Ca, Mg, Li, and K) from Bledug Kuwu’s Brine into Lewatit MonoPlus S-108 resins has been studied. Bledug Kuwu’s Brine comprised 15.11 ppm Li, 179.91 ppm K, 72.01 ppm Ca, and 29.76 ppm Mg. The adsorption was carried out by varying pH of brine (4, 6, 8, and 10) and contact time (1, 2, and 4 hours) with continuous flow in column test at room temperature. The result showed the quantity adsorbate in outer resin: K>Li>Ca>Mg in all conditions, which is 0.038–0.043 mmol/g lithium, 0.087–0.09 mmol/g potassium, 0.031–0.035 mmol/g calcium, and 0.023–0.024 mmol/g magnesium into outer resin surface. The selectivity factor to lithium followed Mg/Li > K/Li> Ca/Li in all conditions. Contact time variable provided high lithium separation after the adsorption process for 2–3 hours, while pH had little effect. FTIR results affirm that resin was changed at new peaks M-O-M at low wavenumber with polystyrene crosslinked-divinylbenzene matrix and contains the sulfonic type. The results obtained from ICP were fitted to isotherm models in ion exchange, as follows: Langmuir, Freundlich, Temkin, and Dubinin-Radushkevic models. The best model of lithium adsorption into Lewatit S-108 is represented by Freundlich and Temkin Model (R2 ≥ 0.82) with 1.0056 mg/g of adsorption capacity (Kf) and 64.885 J/mol of heat process of sorption.

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supporting

confidence: 54%

Effectiveness and Isotherm Models of Lewatit Monoplus S-108 on Lithium Adsorption Process from Bledug Kuwu Brine with Continuous Flow

Rohmah¹,

Suharyanto²,

Lalasari³

et al. 2021

J. Kim. Sains Apl.

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“…HSs are polymers formed by microbial decomposition of plant and animal residues. Their structures can be described as assemblies of covalently linked aromatic and aliphatic residues carrying mainly carboxyl, phenolic and alkoxy groups [ 1 , 2 , 3 ], which cause their overall charge to be negative. HSs, together with low MW acids, proteins, amino acids and carbohydrates, constitute the natural organic matter (NOM) in all drinking water sources [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

“…The negatively charged ions of the aliphatic side chains of HSs are exchanged for mobile anions (e.g., chloride or hydroxyl ions) connected with the functional groups of AERs. The rest of their structure accumulates on the surface of the AER bead, inhibiting the penetration of counterions into the resin and interrupting the exchange sites [ 2 , 12 , 13 , 14 , 15 ]. The hydrophobic moieties of the organic molecule may also adsorb onto the resin polymer.…”

Section: Introductionmentioning

confidence: 99%

“…FTIR has been used to evaluate the performance of the resins during the softening process [ 20 ], to determine the functional groups in the resin structure responsible for fluoride sorption [ 21 ] and to determine the thermal degradation steps of the analysed resins [ 22 ]. As the author’s previous research has shown [ 2 , 15 ], FTIR is quick and cost-effective method for detecting foulants and observing changes on the surface of AER beads during IE.…”

Section: Introductionmentioning

confidence: 99%

“…UV and UV-vis spectrophotometers provide information on the UV254 and UV absorbance. Fluorescence spectrophotometers and chromatographs provide information on dissolved organic carbon [2,15]. Another method which allows the identification of carbon atoms in organic molecule is 13 C-NMR (carbon-13 nuclear magnetic resonance) spectroscopy [19].…”

Section: Introductionmentioning

confidence: 99%

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The Study of Humic Substances’ Impact on Anion Exchangers

Wiercik,

Garbowski,

Chrobot

2024

Materials

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Humic substances (HSs) present in water and wastewater cause fouling of anion exchange resins (AERs), which mainly results in reducing the ion exchange capacity (IEC). In this paper, an attempt was made to investigate fouling of two polystyrene and one polyacrylic AER using water from the Oder River, treated wastewater after the ultrafiltration process (UFTW) and digester reject water from sludge dewatering at the Janówek Wastewater Treatment Plant (WWTP) in Wrocław. HSs contained in digester reject water were characterised by the lowest aromaticity and molecular weights (MWs), the highest proportion of hydrophilic fraction and the highest amount of oxygenated functional groups. The Fourier-transform infrared (FTIR) analyses made it possible to identify chemical bonds characteristic of HSs and determine the mechanism of their retention on the surface of AER beads. The conducted experiments brought unexpected results, as the IEC increased with the amount of organic matter in the feed. Presumably, the humic substances accumulated on the beads and in the porosity of the anion exchangers themselves participated in the ion exchange process.

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