Utilization of green organic solvents in solvent extraction and liquid membrane for sustainable wastewater treatment and resource recovery—a review

Chang, Siu Hua

doi:10.1007/s11356-020-09639-7

Cited by 68 publications

(30 citation statements)

References 138 publications

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“…The industrial transition to green and sustainable production processes has led to intensive research into alternatives to organic solvent-based processing. In this context, Natural Deep Eutectic Solvents (NADES) have attracted the interest of researchers from a diverse range of different analytical and applications fields [ 35 ], biotechnology [ 36 ], energy [ 37 ], water remediation [ 38 ], food industry [ 39 ], cosmetics and pharmaceutics [ 40 , 41 ], etc. NADES are solvents of great interest in chemistry, due to their unique solvent properties, including high extraction ability for some natural products and high solubilisation strength of a wide range of organic and inorganic compounds [ 35 , 42 , 43 , 44 ].…”

Section: Introductionmentioning

confidence: 99%

In Situ Water Quantification in Natural Deep Eutectic Solvents Using Portable Raman Spectroscopy

et al. 2021

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Raman spectroscopy is a label-free, non-destructive, non-invasive analytical tool that provides insight into the molecular composition of samples with minimum or no sample preparation. The increased availability of commercial portable Raman devices presents a potentially easy and convenient analytical solution for day-to-day analysis in laboratories and production lines. However, their performance for highly specific and sensitive analysis applications has not been extensively evaluated. This study performs a direct comparison of such a commercially available, portable Raman system, with a research grade Raman microscope system for the analysis of water content of Natural Deep Eutectic Solvents (NADES). NADES are renewable, biodegradable and easily tunable “green” solvents, outcompeting existing organic solvents for applications in extraction from biomass, biocatalysis, and nanoparticle synthesis. Water content in NADES is, however, a critical parameter, affecting their properties, optimal use and extraction efficiency. In the present study, portable Raman spectroscopy coupled with Partial Least Squares Regression (PLSR) is investigated for rapid determination of water content in NADES samples in situ, i.e., directly in glassware. Three NADES systems, namely Betaine Glycerol (BG), Choline Chloride Glycerol (CCG) and Glucose Glycerol (GG), containing a range of water concentrations between 0% (w/w) and 28.5% (w/w), were studied. The results are directly compared with previously published studies of the same systems, using a research grade Raman microscope. PLSR results demonstrate the reliability of the analysis, surrendering R2 values above 0.99. Root Mean Square Errors Prediction (RMSEP) of 0.6805%, 0.9859% and 1.2907% w/w were found for respectively unknown CCG, BG and GG samples using the portable device compared to 0.4715%, 0.3437% and 0.7409% w/w previously obtained by analysis in quartz cuvettes with a Raman confocal microscope. Despite the relatively higher values of RMSEP observed, the comparison of the percentage of relative errors in the predicted concentration highlights that, overall, the portable device delivers accuracy below 5%. Ultimately, it has been demonstrated that portable Raman spectroscopy enables accurate quantification of water in NADES directly through glass vials without the requirement for sample withdrawal. Such compact instruments provide solvent and consumable free analysis for rapid analysis directly in laboratories and for non-expert users. Portable Raman is a promising approach for high throughput monitoring of water content in NADES that can support the development of new analytical protocols in the field of green chemistry in research and development laboratories but also in the industry as a routine quality control tool.

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Section: Introductionmentioning

confidence: 99%

In Situ Water Quantification in Natural Deep Eutectic Solvents Using Portable Raman Spectroscopy

et al. 2021

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“…In engineering designs, multi-functional reactors, hybrid separators, alternative energy sources, and specially designed equipment have been introduced. Specifically, with solvent recovery, separators such as dividing-wall column, membrane distillation, pervaporation, membrane adsorption, adsorptive distillation, and liquid membrane can be viable choices ( Boi et al., 2020 ; Chang, 2020 ; Dejanović et al., 2010 ; González et al., 2017 ; León and Fontalvo, 2018 ; Luis, 2018 ; Megawati et al., 2017 ; Shao and Kumar, 2011 ; Slater et al., 2012b ). A dividing wall column is an alternative to conventional distillation that uses a longitudinal partition wall to separate multiple components in one unit.…”

Section: Emerging Trends In Designing Solvent Recoverymentioning

confidence: 99%

“…Adsorptive distillation adds selective adsorbents into the distillation feed to remove impurities, azeotropes, and components with similar relative volatilities ( Stankiewicz and Moulijn, 2000 ). Chang (2020) discusses the use of green solvents in extraction and liquid membrane. Liquid membrane (LM) is an emerging technology promoting solute removal and solvent extraction into one unit.…”

Section: Emerging Trends In Designing Solvent Recoverymentioning

confidence: 99%

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Systems level roadmap for solvent recovery and reuse in industries

2021

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Summary Recovering waste solvent for reuse presents an excellent alternative to improving the greenness of industrial processes. Implementing solvent recovery practices in the chemical industry is necessary, given the increasing focus on sustainability to promote a circular economy. However, the systematic design of recovery processes is a daunting task due to the complexities associated with waste stream composition, techno-economic analysis, and environmental assessment. Furthermore, the challenges to satisfy the desired product specifications, particularly in pharmaceuticals and specialty chemical industries, may also deter solvent recovery and reuse practices. To this end, this review presents a systems-level approach including various methodologies that can be implemented to design and evaluate efficient solvent recovery pathways.

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“…Recently, there is an increasing trend towards the utilization of green organic solvents in solvent extraction for resource recovery following the growing public awareness of environmental issues (Chang, 2020). In this regard, our research team has successfully used a processing residue from palm kernel oil refinery, namely, palm kernel fatty acid distillate (PKFAD), as a novel low-cost and environmentally benign organic solvent for Cu(II) extraction from acidic sulfate media (Halim et al, 2020(Halim et al, , 2019.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Cu(II) From Acidic Sulfate Media by Palm Kernel Fatty Acid Distillate: Stoichiometry and Thermodynamic Studies

Halim¹,

Morad²,

Chang³

2021

Preprint

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In efforts to develop a novel low-cost and eco-friendly organic solvent, namely, palm kernel fatty acid distillate (PKFAD), with free fatty acids (FFAs) as the active components, for Cu(II) extraction from acidic sulfate media, this work aimed to gain insight into the stoichiometry of Cu(II)-FFA complexes (extracted species) in PKFAD and their extraction thermodynamics. The former was explored by both the equilibrium slope and numerical analyses, while the latter was determined from the extraction of Cu(II) by PKFAD at different temperatures. Both the equilibrium slope and numerical analyses revealed that the stoichiometry of Cu(II)-FFA complexes in PKFAD was 1:6, whereas the thermodynamic study indicated that Cu(II) extraction by PKFAD was exothermic, nonspontaneous, and enthalpy-driven over the temperature range studied. A plausible structure of Cu(II)-FFA complexes in PKFAD was also postulated based on the thermodynamic data obtained.

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Utilization of green organic solvents in solvent extraction and liquid membrane for sustainable wastewater treatment and resource recovery—a review

Cited by 68 publications

References 138 publications

In Situ Water Quantification in Natural Deep Eutectic Solvents Using Portable Raman Spectroscopy

In Situ Water Quantification in Natural Deep Eutectic Solvents Using Portable Raman Spectroscopy

Systems level roadmap for solvent recovery and reuse in industries

Extraction of Cu(II) From Acidic Sulfate Media by Palm Kernel Fatty Acid Distillate: Stoichiometry and Thermodynamic Studies

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