Investigating chromium Cr(VI) removal using imidazolium based ionic liquid-chitosan composite adsorptive film

Sheth, Yashvi; Dharaskar, Swapnil; Khalid, Mohammad; Walvekar, Rashmi

doi:10.1016/j.molliq.2021.118317

Cited by 27 publications

(9 citation statements)

References 26 publications

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“…These results indicate that α-FeO(OH)/GOCS microsphere had a good effect on Cr(VI) adsorption. Other similar chitosan-based composites, such as 1-butyl-3-methylimidazolium acetate modified CS (CS-[BMIM] [OAc], 125.63 mg/g) [31] and CS/cellulose nanocrystals/carbon dots composite (CNCD, 217.80 mg/g) [70], show a higher q m value than α-FeO(OH)/GOCS prepared in this study; these provided references for further optimization of the adsorption properties. It was worth noting that the α-FeO(OH)/GOCS microsphere also had abundant functional groups, such as C-O, C = C, -CH, -OH, -NH 2 , and Fe-O, so it could be expected to remove other metal ions, organic pollutants, dyes, etc.…”

Section: Performance Evaluationmentioning

confidence: 84%

“…These results indicate that α–FeO(OH)/GOCS microsphere had a good effect on Cr(VI) adsorption. Other similar chitosan-based composites, such as 1-butyl-3-methylimidazolium acetate modified CS (CS- [BMIM] [OAc], 125.63 mg/g) [ 31 ] and CS/cellulose nanocrystals/carbon dots composite (CNCD, 217.80 mg/g) [ 70 ], show a higher q m value than α–FeO(OH)/GOCS prepared in this study; these provided references for further optimization of the adsorption properties.…”

Section: Resultsmentioning

confidence: 99%

“…Sheth et al (2022) prepared a novel composite (CS-[BMIM] [OAc]) by modifying the CS with 1-butyl-3-methylimidazolium acetate. The adsorption capacity of Cr(VI) was 125.63 mg/g [ 31 ]. In addition, iron-based materials have the advantages of high efficiency, environmental benignness, abundant resources, and easy magnetic separation, and they are potential candidate materials for adsorbents [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Removal of Cr(VI) from Wastewater Using Graphene Oxide Chitosan Microspheres Modified with α–FeO(OH)

et al. 2022

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Graphene oxide and chitosan microspheres modified with α–FeO(OH) (α–FeO(OH)/GOCS) are prepared and utilized to investigate the performance and mechanism for Cr(VI) removal from aqueous solutions and the possibility of Fe secondary pollution. Batch experiments were carried out to identify the effects of pH, mass, and volume ratio (m/v), coexisting ions, time (t), temperature (T), and Cr(VI) initial concentration (C0) on Cr(VI) removal, and to evaluate adsorption kinetics, equilibrium isotherm, and thermodynamics, as well as the possibility of Fe secondary pollution. The results showed that Cr(VI) adsorption increased with C0, t, and T but decreased with increasing pH and m/v. Coexisting ions inhibited Cr(VI) adsorption, and this inhibition increased with increasing concentration. The influence degrees of anions and cations on the Cr(VI) adsorption in descending order were SO42− > PO42− > NO3− > Cl− and Ca2+ > Mg2+ > Mn2+, respectively. The equilibrium adsorption capacity of Cr(VI) was the highest at 24.16 mg/g, and the removal rate was 97.69% under pH = 3, m/v = 1.0 g/L, T = 298.15 K, and C0 = 25 mg/L. Cr(VI) adsorption was well fitted to a pseudo-second-order kinetic model and was spontaneous and endothermic. The best fit of Cr(VI) adsorption with the Langmuir and Sips models indicated that it was a monolayer and heterogeneous adsorption. The fitted maximum adsorption capacity was 63.19 mg/g using the Sips model under 308.15 K. Cr(VI) removal mainly included electrostatic attraction between Cr(VI) oxyanions with surface Fe–OH2+, and the adsorbed Cr(VI) was partially reduced to Cr(III) and then precipitated on the surface. In addition, there was no Fe secondary pollution during Cr(VI) adsorption.

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Section: Performance Evaluationmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Removal of Cr(VI) from Wastewater Using Graphene Oxide Chitosan Microspheres Modified with α–FeO(OH)

et al. 2022

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“…The appearance of Cr(III) on the surface of DAC-12-GT implies that a reduction reaction occurred in the adsorption process [ 24 ]. According to the O-C=O at 287.4 eV (in Figure 16 D, C1s), it can be concluded that the aldehyde group could be further oxidized and the carboxyl group might be generated [ 25 , 63 , 64 , 65 ].…”

Section: Resultsmentioning

confidence: 99%

Highly Efficient Cationic/Anionic Cellulose Membranes for Removal of Cr(VI) and Pb(II) Ions

Lü

Khan

et al. 2023

Membranes

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To achieve high throughput, low-pressure drops, and high adsorption capacity of Cr(VI) and Pb(II) in industrial wastewater treatment, cellulose membranes containing cationic and anionic groups were fabricated, respectively. In this process, cost-effective cotton fabrics were oxidized using sodium periodate, followed by quaternary ammonium or sulfonation modifications. The chemical composition, surface morphology, and thermal and mechanical properties of the cellulose membranes were investigated by ATR-FTIR, solid-state NMR, SEM, TGA, and tensile experiments. Quaternary ammonium, aldehyde, and sulfonate groups were distributed on the cationic/anionic cellulose fibers as adsorption sites, which issue remarkable adsorption capability to the cellulose membranes. The highly toxic Cr(VI) and Pb(II) ions were used to challenge the adsorption capacity of the cationic and anionic cellulose membranes, respectively. The maximum adsorption capacities of Cr(VI) and Pb(II) ions were 61.7 and 63.7 mg/g, respectively, suggested by Langmuir isotherms, kinetics, and thermodynamics in the static experiments. The dynamic adsorption capability of cationic cellulose membranes against Cr(VI) ions was determined and compared with that of commercially available anionic-exchange membranes. Spiral wound filtration cartridges were fabricated by cationic and anionic cellulose membranes, respectively, and were used to adsorb Cr(VI) and Pb(II) from lab-made wastewater, respectively. The cationic cellulose cartridge can purify 4.4 L of wastewater containing 1.0 mg/L of Cr(VI) ions with a 100% removal ratio, while the pressure drop was retained at 246 Pa. Similarly, the anionic cellulose cartridge exhibited even more impressive adsorption capability; the removal ratio against Pb(II) was 99% when 8.6 L of 1.0 mg/L of Pb(II) ions containing wastewater was treated, and the pressure drop was retained at 234 Pa. A composite cartridge fabricated by the integration of cationic and anionic cellulose membranes was successfully employed to purify the wastewater containing Cr(VI) and Pb(II) simultaneously. The possible adsorption mechanism was proposed, and the recycling ability of the cellulose membranes was also discussed.

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“…Many studies have shown that PILs interact with adsorbates , (anionic dyes, metal oxoacid ions, and anion metal complexes) by ion exchanging, H-bonding, π-type interactions, and so on, showing promising application prospects in the separation and purification field. Imidazolium-based PILs have showed an unprecedentedly high sorption capacity for Cr(VI) and methyl orange (MO) .…”

Section: Introductionmentioning

confidence: 99%

Selective and Efficient Platinum Group Metal Adsorption from Wastewater by Localized Triethylamine-Based Poly(Ionic Liquid)

Zhang,

Huang

et al. 2023

ACS EST Water

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With environmental problems and resource scarcity, it is urgent to recover Platinum Group Metals (PGMs) from wastewater. In this study, poly(styrene-triethylammonium cation) (PIL-TEA) was synthesized, characterized, and used as adsorbent for Pt(II), Pt(IV), and Ir(IV) in both synthetic and real wastewater. Various isotherm and kinetic models were employed to analyze the adsorption process, revealing that it involves chemisorption, with internal diffusion being the crucial step. The different adsorption performances of PGMs can be attributed to factors such as electrostatic interaction, weak bonding, configuration, and electrostatic potential (ESP) between anions and cations. Notably, ESP complementarity dictates the actual adsorption performance order: Pt(II) > Pt(IV) > Ir(IV). The higher the degree of ESP complementarity, the stronger the adsorption tendency. Furthermore, the study reveals that localized triethylammonium exhibits remarkable adsorption efficiency for trace PGMs in wastewater, with adsorption capacities reaching 1.615, 1.354, and 1.010 mmol/g for Pt(II), Pt(IV), and Ir(IV) respectively. Overall, this research demonstrates the excellent adsorption performance of PIL-TEA for recovering PGMs from wastewater thanks to its exceptional ability to resist miscellaneous ion interference. It also provides valuable insights into the relationship between the adsorption performance and the structure− property interplay in wastewater.

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Investigating chromium Cr(VI) removal using imidazolium based ionic liquid-chitosan composite adsorptive film

Cited by 27 publications

References 26 publications

Removal of Cr(VI) from Wastewater Using Graphene Oxide Chitosan Microspheres Modified with α–FeO(OH)

Removal of Cr(VI) from Wastewater Using Graphene Oxide Chitosan Microspheres Modified with α–FeO(OH)

Highly Efficient Cationic/Anionic Cellulose Membranes for Removal of Cr(VI) and Pb(II) Ions

Selective and Efficient Platinum Group Metal Adsorption from Wastewater by Localized Triethylamine-Based Poly(Ionic Liquid)

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