scholarly journals Heavy Metal Extraction under Environmentally Relevant Conditions Using 3-Hydroxy-2-Naphthoate- Based Ionic Liquids: Extraction Capabilities vs. Acute Algal Toxicity

2020 ◽  
Vol 10 (9) ◽  
pp. 3157
Author(s):  
Philip Pirkwieser ◽  
José A. López-López ◽  
Michael Schagerl ◽  
Wolfgang Kandioller ◽  
Bernhard K. Keppler ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Ionic Liquids ◽  
Pure Water ◽  
Metal Extraction ◽  
Quantitative Extraction ◽  
Environmentally Safe ◽  
Algal Toxicity ◽  
Photochemical Quantum Yield ◽  
Tetradesmus Obliquus ◽  
Extracting Agents

We investigated the applicability of three task-specific ionic liquids (ILs) as heavy metal extracting agents by contrasting extraction capabilities with algal toxicity. The compounds tested were trihexyltetradecylphosphonium-, methyltrioctylphosphonium- and methyltrioctylammonium 3-hydroxy-2-naphthoates. Experiments were performed to assess if these ILs can provide environmentally safe residual concentrations of the target metals after extraction. Both pure water and natural mineral water samples were spiked with 20 µg L−1 of Cu, Ag, Cd, Hg and Pb, respectively. Quantitative extraction (> 99%) of Hg and Ag was achieved. Cu and Hg were below the respective no-observed-effect-concentrations (NOECs) after extraction and Ag below 0.03 µg L−1. Acute toxicity assays were conducted using two freshwater green algae Raphidocelis subcapitata and Tetradesmus obliquus. Growth inhibition and maximum photochemical quantum yield of photosystem II after 72 h were assessed. ILs were less toxic than similar compounds, but still must be classified as acute toxicants for algae. An inhibiting effect on both growth and chlorophyll fluorescence was observed. The leaching of the ILs into the samples remains a limitation regarding their environmental-friendly applicability. Nonetheless, the extremely efficient removal of Cu, Ag and Hg under environmentally relevant conditions calls for further research, which should focus on the immobilization of the ILs.

scholarly journals Thioglycolate-based task-specific ionic liquids: Metal extraction abilities vs acute algal toxicity

2017 ◽  
Vol 340 ◽  
pp. 113-119 ◽  
Author(s):  
Sonja Platzer ◽  
Raphlin Leyma ◽  
Sara Wolske ◽  
Wolfgang Kandioller ◽  
Esther Heid ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Metal Extraction ◽  
Algal Toxicity

scholarly journals Task-specific thioglycolate ionic liquids for heavy metal extraction: Synthesis, extraction efficacies and recycling properties

2017 ◽  
Vol 324 ◽  
pp. 241-249 ◽  
Author(s):  
Sonja Platzer ◽  
Mega Kar ◽  
Raphlin Leyma ◽  
Sonia Chib ◽  
Alexander Roller ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Ionic Liquids ◽  
Metal Extraction ◽  
Heavy Metal Extraction

scholarly journals Extraction of Zinc Metal ions from Aqueous Solution Using Ionic Liquids

2020 ◽  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Ionic Liquid ◽  
Ionic Liquids ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Metal Extraction ◽  
Extraction Behavior ◽  
Liquid Liquid Extraction ◽  
Hydrophobic Ionic Liquids

<p>This work analyzes the extraction behavior of transition heavy metal Zinc and other metal ions such as Copper, and Cadmium from hydrochloride aqueous solution in the absence of chelating agents by using a novel class of hydrophobic ionic liquids. Ionic liquid for this study was synthesized based on 1-(n-alkyl)-3-methylimidazolium cations and hexafluorophosphate anions followed by the metathesis route at room temperature were evaluated. The advantages of using these ionic liquids include their simple synthesis and sustainability. Which makes them “Greener and Simpler” compared to other solvents used for metal extraction. The experimental results show that ionic liquid 1-Butyl-3-methylimidazolium hexafluorophosphate, [BMPSM][PF6] entirely removed of Zinc (extraction percentage 94.4%) and other Copper and Cadmium heavy metals from the aqueous solutions. Based on the results, the use of ionic liquids for selected heavy metal ions as a substitute to the traditional extraction agents in liquid/liquid extraction of heavy metal ions shows considerable potential and is quite promising and promoting for further extraction.</p>

scholarly journals Kinetics of metal extraction in ionic liquids: Eu3+/HNO3//TODGA/[C1C4im][Tf2N] as a case study

RSC Advances ◽  
2013 ◽  
Vol 3 (27) ◽  
pp. 10736 ◽  
Author(s):  
Michal Sypula ◽  
Ali Ouadi ◽  
Clotilde Gaillard ◽  
Isabelle Billard
Keyword(s):  
Ionic Liquids ◽  
Metal Extraction ◽  
Kinetics Of

scholarly journals Valorization of Spent Coffee by Caffeine Extraction Using Aqueous Solutions of Cholinium-Based Ionic Liquids

2021 ◽  
Vol 13 (13) ◽  
pp. 7509
Author(s):  
Ana M. Ferreira ◽  
Hugo M. D. Gomes ◽  
João A. P. Coutinho ◽  
Mara G. Freire
Keyword(s):  
Ionic Liquids ◽  
Aqueous Solutions ◽  
Pure Water ◽  
Waste Product ◽  
Weight Ratio ◽  
Extraction Yield ◽  
Operational Conditions ◽  
Coffee Grounds ◽  
Extractable Compounds ◽  
Nutraceutical Products

Spent coffee grounds (SCGs) are a waste product with no relevant commercial value. However, SCGs are rich in extractable compounds with biological activity. To add value to this coffee byproduct, water and aqueous solutions of cholinium-based ionic liquids (ILs) were studied to extract caffeine from SCGs. In general, all IL aqueous solutions lead to higher extraction efficiencies of caffeine than pure water, with aqueous solutions of cholinium bicarbonate being the most efficient. A factorial planning was applied to optimize operational conditions. Aqueous solutions of cholinium bicarbonate, at a temperature of 80 °C for 30 min of extraction, a biomass–solvent weight ratio of 0.05 and at an IL concentration of 1.5 M, made it possible to extract 3.29 wt% of caffeine (against 1.50 wt% obtained at the best conditions obtained with pure water). Furthermore, to improve the sustainability of the process, the same IL aqueous solution was consecutively applied to extract caffeine from six samples of fresh biomass, where an increase in the extraction yield from 3.29 to 13.10 wt% was achieved. Finally, the cholinium bicarbonate was converted to cholinium chloride by titration with hydrochloric acid envisioning the direct application of the IL-caffeine extract in food, cosmetic and nutraceutical products. The results obtained prove that aqueous solutions of cholinium-based ILs are improved solvents for the extraction of caffeine from SCGs, paving the way for their use in the valorization of other waste rich in high-value compounds.

scholarly journals Separation and Recycling of Concentrated Heavy Metal Wastewater by Tube Membrane Distillation Integrated with Crystallization

Membranes ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 19 ◽  
Author(s):  
Xiang-Yang Lou ◽  
Zheng Xu ◽  
An-Ping Bai ◽  
Montserrat Resina-Gallego ◽  
Zhong-Guang Ji
Keyword(s):  
Heavy Metal ◽  
Membrane Fouling ◽  
Pure Water ◽  
Sharp Decrease ◽  
Membrane Distillation ◽  
Water Yield ◽  
Mixed System ◽  
Mixed Solutions ◽  
Membrane Flux ◽  
Salt Crystals

Tube membrane distillation (MD) integrated with a crystallization method is used in this study for the concurrent productions of pure water and salt crystals from concentrated single and mixed system solutions. The effects of concentrated Zn2+ and Ni2+ on performance in terms of membrane flux, permeate conductivity, crystal recovery rates, and crystal grades are investigated. Preferred crystallization and co-crystallization determinations were performed for mixed solutions. The results revealed that membrane fluxes remained at 2.61 kg·m−2·h−1 and showed a sharp decline until the saturation increased to 1.38. Water yield conductivity was below 10 μs·cm−1. High concentrated zinc and nickel did not have a particular effect on the rejection of the membrane process. For the mixed solutions, membrane flux showed a sharp decrease due to the high saturation, while the conductivity of permeate remained below 10 μs·cm−1 during the whole process. Co-crystallization has been proven to be a better method due to the existence of the SO42− common-ion effect. Membrane fouling studies have suggested that the membrane has excellent resistance to fouling from highly concentrated solutions. The MD integrated with crystallization proves to be a promising technology for treating highly concentrated heavy metal solutions.

scholarly journals Heavy metal extraction by a counter-flow moving bed reactor

2012 ◽  
Vol 04 (12) ◽  
pp. 992-1001
Author(s):  
Azza H. Ali ◽  
M. Abdelaziz ◽  
H. F. Elbakhshawangy ◽  
Sameh H. Othman
Keyword(s):  
Heavy Metal ◽  
Metal Extraction ◽  
Counter Flow ◽  
Moving Bed ◽  
Heavy Metal Extraction

Heavy metal extraction from an artificially contaminated sandy soil under EDDS deficiency: Significance of humic acid and chelant mixture

Chemosphere ◽  
2010 ◽  
Vol 80 (4) ◽  
pp. 416-421 ◽  
Author(s):  
Theo C.M. Yip ◽  
Dickson Y.S. Yan ◽  
Matthew M.T. Yui ◽  
Daniel C.W. Tsang ◽  
Irene M.C. Lo
Keyword(s):  
Heavy Metal ◽  
Humic Acid ◽  
Sandy Soil ◽  
Metal Extraction ◽  
Heavy Metal Extraction

Synchronous Concentrating and Purifying Dilute Nickel Wastewater by Electrodeionization Technology

2011 ◽  
Vol 233-235 ◽  
pp. 351-354 ◽  
Author(s):  
Hui Xia Lu ◽  
Jian You Wang ◽  
Shao Feng Bu
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Applied Voltage ◽  
Stream Flow ◽  
Heavy Metal Ions ◽  
Pure Water ◽  
Operating Parameters ◽  
Feed Water ◽  
Water Production ◽  
Flow Rates

Applicable configuration alteration of the electrodeionization （EDI）process commonly for pure water production was carried out to treat dilute nickel wastewater in this paper. The effects of major operating parameters such as applied voltage, dilute and concentrate stream flow rates on the performance of EDI process were investigated systematically. The results showed that, with the feed water containing 50mg·L-1 Ni2+ and pH of 5.7, the dilute resistivity of the EDI could reach higher than 1.0MΩ·cm which gave a Ni2+ rejection more than 99.8% while the Ni2+ was concentrated as high as 1564mg·L-1 in the concentrate stream by optimizing the operating parameters. It was indicated that pure water production and concentrating of heavy metal ions could be simultaneously accomplished via EDI technology just in one process, valuable heavy metal and water resource could be recovered as well.

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