Ionic liquids in wastewater treatment: A review on pollutant removal and degradation, recovery of ionic liquids, economics and future perspectives

Rangarajan, Goutham; Pal, Rohit; Vigneshwar, Sivakumar Shri; Swetha, A. Catherine; Arun, Jayaseelan; Gopinath, Kannappan Panchamoorthy; Pugazhendhi, Arivalagan

doi:10.1016/j.molliq.2021.118150

Cited by 65 publications

(22 citation statements)

References 177 publications

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“…The partition coefficient between ILs and water varies with the change of pH, offering the possibility of separation and enrichment of heavy metals as well as recovery from the IL medium and subsequent reuse. The removal efficiency of heavy metals such as cadmium, copper, and zinc by ILs reaches 90% to 99% [ 4 ]. In 2003, Wei et al [ 5 ] successfully extracted Hg 2+ , Pb 2+ , and Cd 2+ , from the aqueous phase into 1-butyl-3-methylimidazolium hexafluorophosphate using dithizone as the chelating agent.…”

Section: Application Of Ilsmentioning

confidence: 99%

Recent Advances in Ionic Liquids and Ionic Liquid-Functionalized Graphene: Catalytic Application and Environmental Remediation

Han

Bai

Zhang

et al. 2022

IJERPH

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Applications of ionic liquids (ILs) for the modification physicochemical properties of porous materials have been extensively studied with respect to various applications based on the understanding and development of properties of ILs. In this review, IL–graphene composites are discussed and provided a perspective of composites of IL. IL has been used as a medium to improve the dispersibility of graphene, and the resulting composite material shows excellent performance in gas separation and catalysis during environmental treatment. The applications of ILs and IL–functionalized graphene are discussed in detail with the actual environmental issues, and the main challenges and opportunities for possible future applications are summarized.

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Section: Application Of Ilsmentioning

confidence: 99%

Recent Advances in Ionic Liquids and Ionic Liquid-Functionalized Graphene: Catalytic Application and Environmental Remediation

Han

Bai

Zhang

et al. 2022

IJERPH

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“…In membrane technology, because of their ability and durability to form membranes, poly-ionic liquids can be used. Magnetic ILs are characterized by paramagnetic properties, and easy dispersion in solutions [ 3 , 4 ]. ILs’ applications have a multidisciplinary character.…”

Section: Introductionmentioning

confidence: 99%

Recovery of the N,N-Dibutylimidazolium Chloride Ionic Liquid from Aqueous Solutions by Electrodialysis Method

Babilas

Kowalik-Klimczak

Mielańczyk

2022

IJMS

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Ionic liquids (ILs), named also as liquid salts, are compounds that have unique properties and molecular architecture. ILs are used in various industries; however, due to their toxicity, the ILs’ recovery from the postreaction solutions is also a very important issue. In this paper, the possibility of 1,3-dialkylimidazolium IL, especially the N,N-dibutylimidazolium chloride ([C4C4IM]Cl) recovery by using the electrodialysis (ED) method was investigated. The influence of [C4C4IM]Cl concentration in diluate solution on the ED efficiency was determined. Moreover, the influence of IL on the ion-exchange membranes’ morphology was examined. The recovery of [C4C4IM]Cl, the [C4C4IM]Cl flux across membranes, the [C4C4IM]Cl concentration degree, the energy consumption, and the current efficiency were determined. The results showed that the ED allows for the [C4C4IM]Cl recovery and concentration from dilute solutions. It was found that the [C4C4IM]Cl content in the concentrates after ED was above three times higher than in the initial diluate solutions. It was noted that the ED of solutions containing 5–20 g/L [C4C4IM]Cl allows for ILs recovery in the range of 73.77–92.45% with current efficiency from 68.66% to 92.99%. The [C4C4IM]Cl recovery depended upon the initial [C4C4IM]Cl concentration in the working solution. The highest [C4C4IM]Cl recovery (92.45%) and ED efficiency (92.99%) were obtained when the [C4C4IM]Cl content in the diluate solution was equal 20 g/L. Presented results proved that ED can be an interesting and effective method for the [C4C4IM]Cl recovery from the dilute aqueous solutions.

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“…Based on the principles of green chemistry, some ILs are regarded as excellent green solvents. The chief characteristic features of ILs include nonflammability, high electrochemical stability, high solubility in polymers, appreciable chemical stabilities, uniform interfacial ion arrangements, high thermal stabilities, and low toxicities, volatilities, flammabilities, and vapor pressures. − Systematic synthesis using appropriate combinations of anions and cations has resulted in the syntheses of numerous ILs with different solvation powers, densities, conductivities, melting points, viscosities, polarities, acid and base characteristics, and hydrophobicities and hydrophilicities. Because of their polarities, some ILs are immiscible with most organic liquids, which makes them candidates for investigations on the phase transition and self-assembly behaviors of polymers and block copolymers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Imidazolium Nitrate Ionic Liquids on Conformational Changes of Poly(N-vinylcaprolactam)

et al. 2022

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Detailed information about molecular interactions and conformational changes of polymeric components in the presence of ionic liquids (ILs) is essential for designing novel polymeric ionic liquid-based biomaterials. In biomaterials science and technology, thermoresponsive polymers (TRPs) are widely viewed as potential candidates for the fabrication of biorelated medical devices. Here, we synthesized thermoresponsive poly(Nvinyl-caprolactam) (PVCL) polymer and investigated the effects of imidazolium-based ILs (1-ethyl-3-methyl imidazolium nitrate and 1-butyl-3-methylimidazolium nitrate) with common anion and different cations on the phase transition behavior of PVCL aqueous solution. The impact of ILs on the phase transition behavior of PVCL was monitored by using UV−visible absorption spectra, steady-state fluorescence spectroscopy, thermal fluorescence spectroscopy, and temperature dependent dynamic light scattering. Results showed significant changes in the absorbance, molecular interactions, agglomeration, and coil to globule transition behaviors of PVCL in the presence of two ILs. PVCL aqueous solution showed significant conformational changes after the addition of ILs.

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Ionic liquids in wastewater treatment: A review on pollutant removal and degradation, recovery of ionic liquids, economics and future perspectives

Cited by 65 publications

References 177 publications

Recent Advances in Ionic Liquids and Ionic Liquid-Functionalized Graphene: Catalytic Application and Environmental Remediation

Recent Advances in Ionic Liquids and Ionic Liquid-Functionalized Graphene: Catalytic Application and Environmental Remediation

Recovery of the N,N-Dibutylimidazolium Chloride Ionic Liquid from Aqueous Solutions by Electrodialysis Method

Effect of Imidazolium Nitrate Ionic Liquids on Conformational Changes of Poly(N-vinylcaprolactam)

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