Mixed cloud point/solid phase extraction of lead(II) and cadmium(II) in water samples using modified-ZnO nanopowders

Nekouei, Shahram; Nekouei, Farzin; Tyagi, Inderjeet; Agarwal, Shilpi; Gupta, Vinod Kumar

doi:10.1016/j.psep.2015.11.005

Cited by 35 publications

(16 citation statements)

References 78 publications

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“…Conventional methods including coagulation, chemical precipitation, ion exchange, adsorption, membrane separation, reverse osmosis, oxidation, evaporation, electro-flotation, and solvent extraction were successfully employed for the removal of heavy metals [73,96]. However, most of these methods have some disadvantages such as complicated treatment process, high cost, and high energy demand.…”

Section: Introductionmentioning

confidence: 99%

Removal of copper ions from aqueous solution using NaOH-treated rice husk

et al. 2020

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The present study investigates the removal of copper ions (Cu (II)) from aqueous solution using chemically treated rice husk (TRH). The chemical treatment was carried out using NaOH solution and the effect of contact time (tc), adsorbent dosage (Dad), initial Cu (II) concentration ([Cu]i), and temperature (T) on the percentage removals of Cu (II) (%RCu) were investigated. Different analytical techniques (FTIR, SEM, and EDX) were used to confirm the adsorption (ads) of Cu (II) onto the TRH. The ads kinetics was tested against pseudo-first-order (PFO) and pseudo-second-order (PSO) models as well as Langmuir and Freundlich isotherms. Treating RH with NaOH altered the surface and functional groups, and on the surface of RH, the ionic ligands with high electro-attraction to Cu increased and thus improved the removal efficiency. The %RCu decreased by increasing the [Cu]i and increased by increasing the ct, Dad, and T. Up to 97% Cu removal was achieved in ct of 30 min using Dad of 0.3 g [Cu]i of 25 mg L−1 and T = 280 K. The ads of Cu on TRH is endothermic, spontaneous, follows Langmuir isotherms, and exhibited a PSO kinetics. Moreover, the TRH was successfully regenerated and used for further adsorption cycles using 1 M HNO3.

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Section: Introductionmentioning

confidence: 99%

Removal of copper ions from aqueous solution using NaOH-treated rice husk

et al. 2020

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“…Long-term exposure to lead causes cumulative poisoning which leads to central nervous system damages [ 1 , 2 ]. On account of this, even at low concentration, determination and controlling of lead content are crucial [ 3 ]. However, because of their complex matrix and trace concentration, determination of heavy metals in many real samples is a difficult analytical task and requires sensitive detection techniques and probably a preconcentration procedure [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

A Method to Determination of Lead Ions in Aqueous Samples: Ultrasound-Assisted Dispersive Liquid-Liquid Microextraction Method Based on Solidification of Floating Organic Drop and Back-Extraction Followed by FAAS

Arpa

Arıdaşır

2018

Journal of Analytical Methods in Chemistry

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Ultrasound-assisted dispersive liquid-liquid microextraction method based on solidification of floating organic drop and back-extraction (UA-DLLME-SFO-BE) technique was proposed for preconcentration of lead ions. In this technique, two SFODME steps are applied in sequence. The classical SFODME was applied as the first step and then the second (back-extraction) step was applied. For the classical SFODME, Pb ions were complexed with Congo red at pH 10.0 and then extracted into 1-dodecanol. After this stage, a second extraction step was performed instead of direct determination of the analyte ion in the classical method. For this purpose, the organic phase containing the extracted analyte ions is treated with 1.0 mol·L−1 HNO3 solution and then exposed to ultrasonication. So, the analyte ions were back-extracted into the aqueous phase. Finally, the analyte ions in the aqueous phase were determined by FAAS directly. Owing to the second extraction step, a clogging problem caused by 1-dodecanol during FAAS determination was avoided. Some parameters which affect the extraction efficiency such as pH, volume of extraction solvent, concentration of complexing agent, type, volume, and concentration of back-extraction solvent, effect of cationic surfactant addition, effect of temperature, and so on were examined. Performed experiments showed that optimum pH was 10.0, 1-dodecanol extraction solvent volume was 75 μL, back-extraction solvent was 500 μL, 1.0 mol·L−1 HNO3, extraction time was 4 min, and extraction temperature was 40°C. Under optimum conditions, the enhancement factor, limit of detection, limit of quantification, and relative standard deviation were calculated as 81, 1.9 μg·L−1, 6.4 μg·L−1, and 3.4% (for 25 μg·L−1 Pb2+), respectively.

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“…Solid phase extraction, coprecipitation, cloud point extraction, membrane filtration, electro deposition, liquid liquid extraction, photo-degradation, photocatalysis and, ion exchange are the methods for the preconcentration of metals in a variety of samples [8][9][10][11][12][13] . Solid phase extraction (SPE) has attained special interest related to features such as easy procedure, low operational time, high preconcentration factor, high retention, low cost, low pollution, flexibility and reusability of absorbents/biosorbents [14][15][16] .The aim of the study is the development of an analytical method based on the use of thermophilic Anoxybacillus kestanboliensis immobilized biosorbent as a solid phase extractor for Co(II) and Hg (II). According open Scientific RepoRtS | (2020) 10:455 | https://doi.org/10.1038/s41598-019-57401-y www.nature.com/scientificreports www.nature.com/scientificreports/ to our literature survey, further researches are required for the use of immobilized thermophilic bacteria as a biosorbent material for the preconcentration of metal ions.…”

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confidence: 99%

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A Novel Biosorbent for Preconcentrations of Co(II) and Hg(II) in Real Samples

Özdemir

Kılınç

Şen

2020

Sci Rep

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A new biosorbent, composed of Amberlite XAD-4 loaded with Anoxybacillus kestanboliensis, was developed and surface morphologies were investigated by SeM and ft-iR. it was used for solid phase column preconcentrations of co(ii) and Hg(ii) before their measurements by icp-oeS. LoDs were calculated as 0.04 and 0.06 ng mL −1 for co(ii) and Hg(ii) respectively. the maximum biosorption capacities were determined as 24.3 and 27.8 mg g −1 for co(ii) and Hg(ii) respectively. preconcentration factors were achieved for Co(II) and Hg(II) as 80. The method validation was performed by analyzing certified reference materials. The new process was successfully utilized for the preconcentration of these metals in various food samples. it should be highlighted that the sensitivity of icp-oeS was critically improved by applying developed method. Hence, ICP-OES could be an effective alternative for icp-MS and/or Gf-AAS.Some metal ions are known to be highly toxic. Therefore, a number of recent studies have focused on metal ion toxicity and carcinogenicity on human beings and other living organisms even at very low levels 1,2 . Among the various types of pollutants, toxic metal ions cannot be easily eliminated from nature 3 . Accumulation of toxic and deleterious metal ions in soft tissues of animals and humans even at low concentrations could be a major concern as they are not metabolized and can create significant damage to the body tissues 4 . Co and Hg are two typical metal ions in environmental samples which are also detected in plants and food samples. Toxicological influences such as vasodilation and cardiomyopathy are reported for Co exposure. Hg is also familiar as it is the most neurotoxic metal ion and can harm most of the human systems 3 .The usage of the biological processes is an idea for the operation of environmental metal pollution. Biological processes for the bioremediation depend on the physical nature of binding sites and chemical conditions 4 . The utilization of biomass, including alive and dead microorganisms in the possibly retention and removal of metal ions from environmental samples, has acquired significant reliability over the past few years due to its efficiency, ecofriendliness and economic choice. The major properties of biosorbents are (a) having a variety of metal binding sites, (b) having small and identical sizes, (c) being less subject to interference from alkali-earth and alkali metals than ion-exchange resins (d) being generally cheaper than functionalized polymers (e) having the possibility to be obtained via green technologies 5 .Concentrations of toxic metal ions are known as trace levels that are lower than the quantification limit of the instruments 6 . The determination, separation and analysis of low concentration of toxic metal ions in natural samples such as soil, food and water have become significant 7 . Therefore, it is necessary to develop analytical methods to preconcentrate and determine trace metal ions 6 .Alternative methods are recommended for the preconcentration and separatio...

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Mixed cloud point/solid phase extraction of lead(II) and cadmium(II) in water samples using modified-ZnO nanopowders

Cited by 35 publications

References 78 publications

Removal of copper ions from aqueous solution using NaOH-treated rice husk

Removal of copper ions from aqueous solution using NaOH-treated rice husk

A Method to Determination of Lead Ions in Aqueous Samples: Ultrasound-Assisted Dispersive Liquid-Liquid Microextraction Method Based on Solidification of Floating Organic Drop and Back-Extraction Followed by FAAS

A Novel Biosorbent for Preconcentrations of Co(II) and Hg(II) in Real Samples

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