Cyclohexylamine as extraction solvent and chelating agent in extraction and preconcentration of some heavy metals in aqueous samples based on heat-induced homogeneous liquid-liquid extraction

Sorouraddin, Saeed Mohammad; Farajzadeh, Mir Ali; Okhravi, Tohid

doi:10.1016/j.talanta.2017.07.065

Cited by 55 publications

(24 citation statements)

References 39 publications

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“…5,6 Therefore, the removal of Pb(II) from the aquatic environment is both urgent and very important. Various technologies for the treatment of water, polluted by heavy metals, have been reported, such as liquid phase extraction, 7,8 membrane filtration, 9 co-precipitation, 10 ion exchangers, 11 bioaccumulation, 12 and adsorption. 13−15 Among all these techniques, adsorption has attracted greater attention, because of its most promising and widely applied approaches, simplicity, low cost, environmentally friendly nature, and its effective elimination ability.…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface

et al. 2019

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Efficient materials capable of capturing toxic metals from water are widely needed. Herein, a new pyridylpyrazole-β-ketoenol receptor, X-ray diffraction analyzed, was covalently incorporated into the silica surface to produce solid and recyclable adsorbent particles. The new material, fully characterized, revealed extremely efficient removal of toxic metals from water, with a selectivity order of Pb(II) > Zn(II) > Cu(II) > Cd(II). The adsorption was exceptionally rapid at optimum pH and concentrations, showing Pb(II) removal of 93 mg g –1 within 5 min and maximum Pb(II) adsorption of 110 mg g –1 after only 20 min. Sorption isotherms agreed well with the Langmuir model suggesting a monolayer adsorption, whereas kinetics agreed with the pseudo-second-order model suggesting a chemisorption binding mechanism. Thermodynamics of adsorption were fitted with an endothermic and spontaneous process. The material, recyclable for at least five cycles, is therefore promising for the cleanup of water polluted by toxic metals, especially lead.

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Section: Introductionmentioning

confidence: 99%

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface

et al. 2019

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“…In complex samples, it is more difficult to obtain a separated floating organic drop due to the interaction of the matrix components with the organic solvents [21]. Therefore, researchers in the field developed ad hoc methods to determine the target analytes in specific matrices, such as rice [22], meat [20,23], cheese [24], milk [25], wine [26], urine [27], honey [25], and plasma [1].…”

Section: Introductionmentioning

confidence: 99%

Liquid phase microextraction techniques combined with chromatography analysis: a review

Dugheri

Mucci

Bonari

et al. 2020

Acta Chromatographica

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Sample pretreatment is the first and the most important step of an analytical procedure. In routine analysis, liquid–liquid microextraction (LLE) is the most widely used sample pre-treatment technique, whose goal is to isolate the target analytes, provide enrichment, with cleanup to lower the chemical noise, and enhance the signal. The use of extensive volumes of hazardous organic solvents and production of large amounts of waste make LLE procedures unsuitable for modern, highly automated laboratories, expensive, and environmentally unfriendly. In the past two decades, liquid-phase microextraction (LPME) was introduced to overcome these drawbacks. Thanks to the need of only a few microliters of extraction solvent, LPME techniques have been widely adopted by the scientific community. The aim of this review is to report on the state-of-the-art LPME techniques used in gas and liquid chromatography. Attention was paid to the classification of the LPME operating modes, to the historical contextualization of LPME applications, and to the advantages of microextraction in methods respecting the value of green analytical chemistry. Technical aspects such as description of methodology selected in method development for routine use, specific variants of LPME developed for complex matrices, derivatization, and enrichment techniques are also discussed.

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“… 1 − 4 Lead has been identified as one of the toxic elements which can cause serious diseases such as renal disturbances, hepatitis, anemia, cancer, and so forth. 5 , 6 A wide range of treatment technologies have been indicated for the removal of heavy metals from contaminated water in the last decades, starting from liquid–liquid extraction, 7 ion exchange, 8 chemical precipitation, 9 membrane filtration, 10 coagulation, 11 adsorption, 12 − 14 and ending with electrochemical treatment. 15 Among these approaches, adsorption is regarded as one of the very popular ones and captures enormous attention due to its high efficiency, simplicity, economy, and high environmental friendliness.…”

Section: Introductionmentioning

confidence: 99%

Efficient and Environmentally Friendly Adsorbent Based on β-Ketoenol-Pyrazole-Thiophene for Heavy-Metal Ion Removal from Aquatic Medium: A Combined Experimental and Theoretical Study

et al. 2020

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A new sustainable and environmentally friendly adsorbent based on a β-ketoenol-pyrazole-thiophene receptor grafted onto a silica surface was developed and applied to the removal of heavy-metal ions (Pb(II), Cu(II), Zn(II), and Cd(II)) from aquatic medium. The new material SiNPz-Th was well characterized and confirms the success of covalent binding of the receptor on the silica surface. The effect of environmental parameters on adsorption including pH, contact time, temperature, and the initial concentration were investigated. The maximum adsorption capacities of SiNPz-Th for Pb(II), Cu(II), Zn(II), and Cd(II) ions were 102.20, 76.42, 68.95, and 32.68 mg/g, respectively, at 30 min and pH = 6. The adsorption isotherms, kinetics, and thermodynamic process were investigated and showed efficiency and selectivity toward Pb(II) and good regeneration performance. Density functional theory, noncovalent-interaction, and quantum theory of atoms in molecules calculations were used to study and to gain a deeper understanding of both the adsorption mechanism and selectivity of metal ions onto the adsorbent. Accordingly, metal ions such as Pb(II), Cu(II), and Zn(II) were bidentate coordinated with the adsorbent by nitrogen and oxygen atoms of the Schiff base C=N and hydroxyl group −OH, respectively, to form stable complexes. Whereas Cd(II) was coordinated in a monodentate fashion with oxygen atom of the hydroxyl group. Furthermore, the affinity of SiNPz-Th toward the metal ions was decreased in the order of Pb(II) > Cu(II) > Zn(II) > Cd(II), in good agreement with the experimental results. All these results highlight that SiNPz-Th has good potential to be an advanced adsorbent for the removal of lead ions from real water.

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Cyclohexylamine as extraction solvent and chelating agent in extraction and preconcentration of some heavy metals in aqueous samples based on heat-induced homogeneous liquid-liquid extraction

Cited by 55 publications

References 39 publications

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface

Liquid phase microextraction techniques combined with chromatography analysis: a review

Efficient and Environmentally Friendly Adsorbent Based on β-Ketoenol-Pyrazole-Thiophene for Heavy-Metal Ion Removal from Aquatic Medium: A Combined Experimental and Theoretical Study

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