Diazabenzo crowns grafted on the polystyrene and application of extraction of metal cations

Dardouri, Mokhtar; Amor, Abir Bel Hadj; Meganem, Faouzi

doi:10.1080/19443994.2015.1007485

Cited by 6 publications

(4 citation statements)

References 32 publications

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“…However, the X-ray diffraction patterns (Figure 4) of PSÀ NH 2 (b) showed the appearance of many sharps' peaks, at 19,22,29,31,45, 51 and 56 2θ, as compared to PSÀ NO 2 which had no sharp peaks. In the PSÀ NHÀ Im (c) the two peaks at 29 and 45disappeared.Finally, the complex polystyrene-NH-imidate/Ba 2 + showed the appearance of peaks at many different angles: 18, 20, 22, 26, 27, 29, 31, 33 and 42, some as in PSÀ NH 2 and PSÀ NHÀ Im and some new.…”

Section: Resultsmentioning

confidence: 95%

“…Atomic absorption spectroscopy (AAS) analysis (Perkin-Elmer AAnalyst 200) calibrated with solutions of the studied metal (0.5-5 mg/dm 3 ). Aminated Polystyrene [7,[28][29][30] 5 g weights of polystyrene beads were treated with 40 mL of concentrated HNO 3 and 10 mL of H 2 SO 4 and the mixture stirred at 60 °C for 30 min. The precipitate (PSÀ NO 2 ) was washed with water several times until pH = 7 (acid free).…”

Section: Methodsmentioning

confidence: 99%

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The Study of Impedance and Conductivity of New Modified Polystyrene Used as an Effective Adsorbent of Ba(II) Ions

Nourhene

Othmani

Abderrahim

2023

Chemistry & Biodiversity

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In the research described here we prepared a novel, modified polystyrene (PS) with iminoether as the complexing agent for Ba 2 + . Most heavy metals cause environmental, atmospheric pollution. [1][2] They cause consequence for humans health and aquatic life due to their toxicity. They become strongly toxic by mixing with different environmental elements and their removal from contaminated water is very important. The structure of all modified polystyrene such as nitrated polystyrene (PSÀ NO 2 ), aminated polystyrene (PSÀ NH 2 ), aminated polystyrene with imidate group (PSÀ NHÀ Im) and the complex with barium metal (PSÀ NHÀ Im/Ba 2 + ) were analyzed by Fourier transform infrared spectroscopy (FT-IR), and the formation of N-2-Benzimidazolyl iminoether grafted PS was proved. The thermal stability and structure of the polystyrene and modified polystyrene were studied by differential thermal analysis (DTA) and X-ray diffractometry (XRD), respectively. The elemental analysis was used for the determination of the chemical composition of the modified PS. The grafted polystyrene was used in order to adsorb barium from wastewater with an acceptable cost before the wastewater distribution in the environment. The impedance analysis of the polystyrene complex PSÀ NHÀ Im/Ba 2 + indicated an activated thermal conduction mechanism.The conductivity analysis of the complex with barium metal PSÀ NHÀ Im/Ba 2 + was studied; the activation energy was deduced from an Arrhenius plot and corresponded to, E a ¼ 0:85 eV, suggesting PSÀ NHÀ Im/Ba 2 + was a proton-type of semiconductor.

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Section: Resultsmentioning

confidence: 95%

Section: Methodsmentioning

confidence: 99%

The Study of Impedance and Conductivity of New Modified Polystyrene Used as an Effective Adsorbent of Ba(II) Ions

Nourhene

Othmani

Abderrahim

2023

Chemistry & Biodiversity

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“…In Figure b, characteristic bands of crown ether were observed in all samples. The 2948 cm –1 band should be attributed to aromatic C–H stretching vibration, the 1590 cm –1 band was indicative of the aromatic backbone vibration, the band at 1500 cm –1 should be ascribed to the C–H vibration of the phenyl ring; the 1248 and 1130 cm –1 bands corresponded to the vibration of C–O–C and Ar–O–C, respectively, and the band at 739 cm –1 could be assigned to aromatic C–H vibration of ortho-disubstituted phenyl out-of-plane deformation. − Combining the results from UV and FTIR measurements, we believed that B15C5 could be confined within PVC and continuously provide a B15C5-rich environment for Li and further alter the Li reduction kinetics.…”

Section: Resultsmentioning

confidence: 99%

Electrochemically Regulated Li Deposition by Crown Ether

Lan

Liu

Qin

et al. 2021

ACS Appl. Mater. Interfaces

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The lithium-secondary battery is considered to be the most prospective electrochemical energy storage in the upcoming decades. However, its real application still much depends on the effective strategy toward Li dendrite growth. After years of effort, many successful works have been reported on improving the solid−electrolyte interphase (SEI), either via electrolyte optimization or building artificial SEI while intrinsically adjusting the electrochemical reduction of Li + has been rarely mentioned. Inspired by the successful works in the electroplating industry, in this paper, a Lichelating agent, benzo-15-crown-5 (B15C5) was used to regulate Lireduction kinetics from an electrochemical view. Owing to the coordination with Li + , Li + + complex + e − → Li[complex] is generated and proved by a decreased i 0 value. B15C5 confined within the PVC matrix has been coated on a Li anode. With thus-obtained B15C5-PVC-Li, dendrite growth has been significantly reduced and prolonged cycling has been observed in Li|Li symmetric cells. Electrochemically modulated Li deposition has been further accessed by the full cell of LiFePO 4 |Li, and 163 mA h/g capacity is stably released after 400 cycles at 1.0 mA/cm 2 . This study provides an alternate approach to address the dendrite growth issue and sheds more light on the Li-deposition kinetics.

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“…Thus, at 1600–1500 cm −1 there is a small specific vibration attributed to the C–H bond in the benzene ring from the crown ethers [ 24 ]. The small vibrations recorded at 1250–1140 cm −1 are specific to the C–O–C and C 6 H 5 –O–C bond in the crown ethers [ 25 ].…”

Section: Resultsmentioning

confidence: 99%

A New Perspective on Adsorbent Materials Based Impregnated MgSiO3 with Crown Ethers for Palladium Recovery

Ciopec

Grad

Negrea

et al. 2021

IJMS

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The study of new useful, efficient and selective structures for the palladium ions’ recovery has led to the development of a new series of macromolecules. Thus, this study presents a comparative behavior of two crown benzene ethers that modify the magnesium silicate surface used as adsorbent for palladium. These crown ethers are dibenzo18-crown-6 (DB18C6) and dibenzo 30-crown-10 (DB30C10). The obtained materials were characterized by scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX) and Fourier-transform infrared spectroscopy (FT-IR). The specific surface area (BET) and point of zero charge (PZC) of the two materials were determined. The palladium ions’ recovery from synthetic aqueous solutions studies aimed to establish the adsorption mechanism. For this desideratum, the kinetic, equilibrium and thermodynamic studies show that MgSiO3-DB30C10 have a higher adsorption capacity (35.68 mg g−1) compared to MgSiO3-DB18C6 (21.65 mg g−1). Thermodynamic studies highlight that the adsorption of Pd(II) on the two studied materials are spontaneous and endothermic processes. The positive values of the entropy (ΔS0) suggest that the studied adsorption processes show a higher disorder at the liquid/solid interface. Desorption studies were also performed, and it was found that the degree of desorption was 98.3%.

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Diazabenzo crowns grafted on the polystyrene and application of extraction of metal cations

Cited by 6 publications

References 32 publications

The Study of Impedance and Conductivity of New Modified Polystyrene Used as an Effective Adsorbent of Ba(II) Ions

The Study of Impedance and Conductivity of New Modified Polystyrene Used as an Effective Adsorbent of Ba(II) Ions

Electrochemically Regulated Li Deposition by Crown Ether

A New Perspective on Adsorbent Materials Based Impregnated MgSiO3 with Crown Ethers for Palladium Recovery

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