Removal of sulfides from water using a hybrid ion exchanger containing manganese(IV) oxide

Wilk, Łukasz J.; Ciechanowska, Agnieszka; Kociołek‐Balawejder, Elżbieta

doi:10.1016/j.seppur.2019.115882

Cited by 19 publications

(19 citation statements)

References 68 publications

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“…Ion exchangers containing dispersed inorganic fine particles, mostly of FeOOH [22,23] and also MnO2 [24] and ZrO2 [25,26] in their polymeric phase, are composite materials (called hybrid ion exchangers, HIXs) that offer properties and application opportunities not exhibited separately by the polymeric host materials or inorganic particles alone. Their polymeric-inorganic structure offers a synergy often aided by the Donnan membrane principle (in sorption processes the ions with charge similar to the functional groups are excluded from entering in the exchange phase while the ions with charge opposite to the functional groups tend to concentrate inside the exchanger phase [27].…”

Section: Introductionmentioning

confidence: 99%

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

2021

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Hybrid ion exchangers (HIXs) containing fine Cu2O and Cu0 particles were subjected to thermal analysis in order to determine their hygroscopic water content (with regard to their anomalously low porosity) and to determine the effect of the oxidation state of the copper atom in the deposit on the thermal properties of composite materials. Commercially available anion exchangers, Amberlite IRA 900Cl (macroreticular, M) and Amberlite IRA 402OH (gel-like, G), were used as supporting materials. M/Cu2O, G/Cu2O, M/Cu and G/Cu, containing 4.3–8.4 wt% Cu, were subjected to thermal analysis under respectively air and N2. TG/DTG curves revealed that dry M/Cu and G/Cu contained as little as 7.2% and 4.3% hygroscopic water, while M/Cu2O and G/Cu2O contained respectively 10.6% and 9.4% (Cu0 was a stronger water repellent than Cu2O). The oxidation state of the copper atom in the deposit was found to affect the amount of the forming char, and also Cu0 was found to contribute to the formation of more char than in the pyrolysis of the pure resin (the anion exchanger with no copper deposit). Under air the two kinds of particles transformed into CuO, while under N2 metallic copper and char (from the resin phase) made up the solid residue. This means that in the pyrolysis of the HIXs the inorganic phase participated in char formation and it also transformed itself (undergoing reduction when possible). The above findings provide a basis for in-depth research aimed at the innovative use of copper-containing HIXs and at obtaining usable composite materials with a designed (organic-inorganic) composition.

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Section: Introductionmentioning

confidence: 99%

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

2021

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“…Nevertheless, for the solution containing 500 mg, S 2− /dm 3 q e of CWM3#MnO 2 was calculated to be about 144 and 140 mg S 2− /g for HIX without and with altered carboxylic groups, respectively. Obtained maximal sorption capacities for CWM3#MnO 2 were comparable with HIX containing MnO 2 obtained using the macroporous strongly basic anion exchanger with quaternary ammonium functional groups, which was able to remove 150 mg S 2− /g [ 54 ], and lower than estimated sorption capacity of bio-derived porous graphitic carbon impregnated with MnO 2 (approximately 525 mg S 2− /g) [ 78 ].…”

Section: Resultsmentioning

confidence: 89%

“…Moreover, polysulfides were detected on spent HIX beads containing dispersed MnO 2 during a study performed in comparable conditions [ 54 ].…”

Section: Resultsmentioning

confidence: 99%

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Adsorptive-Oxidative Removal of Sulfides from Water by MnO2-Loaded Carboxylic Cation Exchangers

2020

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Hybrid ion exchangers (HIX) containing manganese(IV) oxide (MnO2) based on macroporous and gel-type carboxylic cation exchangers as supporting materials were obtained. The hybrid materials were characterized using scanning electron microscopy with energy dispersive spectrometry (SEM/EDS), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and nitrogen adsorption isotherms at 77 K and mercury porosimetry. HIX with introduced MnO2 (20.0–32.8 wt% Mn) were tested for removal of dissolved sulfides from anoxic aqueous solutions with 100–500 mg S2−/dm3 concentrations. The process proceeded effortlessly at pH 10–13 despite unfavorable electrostatic interactions of the reactants. The highest exhibited sorption capacity was 144.3 ± 7.1 mg S2−/g. Approximately 65% of dissolved sulfides were oxidized to S2O32− ions and repelled from HIX structure. On average, 13% of sulfide removal products were adsorbed by the MnO2 surface. The impact of MnO2 load and the ionic form of HIX functional groups on removal of sulfides and resulting products was examined. The mechanism of the process is suggested.

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“…So far, in the synthesis of HIXs, the focus has been mainly on the introduction of polyvalent metal oxides characterized by amphoteric sorption behaviours, primarily Fe(III) (Li et al 2016;Sarkar et al 2007;Hua et al 2017) and also Mn(IV) (Wilk et al 2020) and Zr(IV) (Bui et al 2021;Zhao et al 2021), into the anion exchanger matrix. The most popular ferric oxides are readily available and environmentally acceptable.…”

Section: Introductionmentioning

confidence: 99%

Anomalous effect of Cu2O and CuO deposit on the porosity of a macroreticular anion exchanger

et al. 2021

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When synthesizing copper compounds containing polymeric adsorbents, it was found that the two copper oxides, Cu2O and CuO, deposited in the skeleton of a strongly basic macroreticular anion exchanger (An) radically diminished the porosity of the obtained composites in relation to the host material. In order to investigate this phenomenon more closely, An/Cu2O and An/CuO (both based on the commercial anion exchanger Amberlite IRA900Cl), containing 8.6 and 8.2 wt% Cu, respectively, were subjected to scrutiny. The porous characteristics of the thermally dried and freeze-dried samples were determined using the N2 adsorption–desorption method and mercury intrusion porosimetry. The thermally dried samples lost their porosity and increased their bulk density in relation to the pure resin indicated a significant reduction in their volume. It was found that during drying, the grains shrank as much as the pores collapsed. The decay of the porous structure resulted from the surface morphology of the Cu2O and CuO particles and their tendency to agglomerate. Both freeze-dried samples retained the porous characteristics typical for macroporous anion exchangers. In contrast to the most popular hybrid ion exchangers containing hydrated polyvalent metal oxides (such FeOOH), An/Cu2O and An/CuO showed markedly strong volume contraction effect in relation to moisture content. Graphical abstract

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Removal of sulfides from water using a hybrid ion exchanger containing manganese(IV) oxide

Cited by 19 publications

References 68 publications

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

Weakly Hydrated Anion Exchangers Doped with Cu2O and Cu0 Particles—Thermogravimetric Studies

Adsorptive-Oxidative Removal of Sulfides from Water by MnO2-Loaded Carboxylic Cation Exchangers

Anomalous effect of Cu2O and CuO deposit on the porosity of a macroreticular anion exchanger

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