Acid Green 1 removal from wastewater by layered double hydroxides

Elkhattabi, El Hassan; Lakraimi, Mohamed; Berraho, Moha; Legrouri, A.; Hammal, Radouan; Gaini, Layla El

doi:10.1007/s13201-018-0658-1

Cited by 15 publications

(7 citation statements)

References 30 publications

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“…In the case with the FEC additive, weak bands at 1860, 1097, and 726 cm –1 reflect ν CO, ν C–F (overlapping with νs C–O–C) and δ C–F, respectively, similar to those reported in the case of FEC over Si . When the LiPO 2 F 2 additive was utilized, ν P–F at 887 cm –1 could be observed, while νas P–O expected at 1273 cm –1 and νs P–O expected at 1030 cm –1 overlapped, respectively, with νas C–O–C and νs C–C of EC/DEC. Menkin et al reported the formation of Li x PF y /LiPO x F y from LiPF 6 decomposition on Cu after soaking in the LiPF 6 /EC-DMC electrolyte.…”

Section: Resultssupporting

confidence: 72%

In Situ Diffuse Reflectance Infrared Fourier-Transform Spectroscopy Investigation of Fluoroethylene Carbonate and Lithium Difluorophosphate Dual Additives in SEI Formation over Cu Anode

Olana

Adem

Lin

et al. 2023

ACS Appl. Energy Mater.

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The synergetic effect of fluoroethylene carbonate (FEC) and lithium difluorophosphate (LiPO2F2) dual additives on the cycling stability of lithium metal batteries has been previously reported. This study applies in situ diffuse reflectance infrared Fourier-transform spectroscopy (DRIFTS) to examine the impact of these two additives on SEI species formation over Cu anode using a base electrolyte of LiPF6 in ethylene carbonate (EC) and diethyl carbonate (DEC). The results indicate that all electrolyte components and additives can be electrochemically reduced over the Cu anode following a potential sequence of LiPO2F2 > FEC > EC > DEC. The results illustrate that LiPF6 likely interacts with the Cu anode upon contact, resulting in Li x PF y , which can lead to a reduction peak at ∼1.44 V in CV. With the base electrolyte, reduced species from Li x PF y lead to the formation of alkyl phosphorus fluorides (RPF), which can be suppressed by the presence of FEC and/or LiPO2F2. Similar to previous reports, FEC reduction in the 1st lithiation cycle leads to the continuous formation of poly(FEC), while EC is electrochemically reduced to (CH2OCO2Li)2 and Li2CO3 and DEC is reduced to CH3CH2OCO2Li and Li2CO3. With only the LiPO2F2 additive, the redox of LiPO2F2 can be found in CV with Li x PO y as the possible reduced product. In addition, Li2CO3 formation from EC and DEC reduction was relatively suppressed by the presence of LiPO2F2. The simultaneous presence of the FEC additive can suppress the redox of LiPO2F2 and partly the decomposition of LiPF6 likely via the preferential adsorption of FEC on Cu. Similar DRIFTS observations are found over the Li anode. The electrolyte with dual additives demonstrates a possible advantage from poly(FEC) and Li x PO y species formation, suppressing the reduction of Li x PF y , EC, and DEC though not completely.

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Section: Resultssupporting

confidence: 72%

In Situ Diffuse Reflectance Infrared Fourier-Transform Spectroscopy Investigation of Fluoroethylene Carbonate and Lithium Difluorophosphate Dual Additives in SEI Formation over Cu Anode

Olana

Adem

Lin

et al. 2023

ACS Appl. Energy Mater.

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“…The LDHs stabilizes IC and delays the combustion of adsorbed molecules. As well, after 600 °C the mass loss is low when the dye is retained, coinciding with endothermic peak in the DSC profile, it probably corresponds to the elimination of a fragment, which contains sulphur in the form of SO2 because of its slow diffusion in the oxide matrix [51], an exothermic peak due to crystallization and the formation of mixed oxides, ZnO, ZnFe2O4, Fe3O4, and Fe2O3, as shown in Figure 10 Similar phenomenon are previously reported for hydrotalcite-like materials [52].…”

Section: Tg and Dsc Analysessupporting

confidence: 82%

Zn-M-CO3 Layered Double Hydroxides (M=Fe, Cr, or Al): Synthesis, Characterization, and Removal of Aqueous Indigo Carmine

Bouteraa

Saiah

Hamouda

et al. 2019

Bull. Chem. React. Eng. Catal.

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In this approach, Zn-M+3 layered double hydroxides (LDHs) with M+3 = Fe, Cr, or Al were synthesized by the co-precipitation method from the aqueous solution at a constant solution pH. The as-synthesized samples were characterized by XRD analysis, FTIR spectra, BET techniques and simultaneous thermogravimetric-differential scanning calorimetry (TGA/DSC). XRD analysis showed that Zn-Fe-CO3 had the greatest lattices parameters. BET surface area of Zn-Fe-CO3 was calculated as 52.24 m2.g-1 and was higher than Zn-Cr-CO3 and Zn-Al-CO3 with 46.70 and 49.99 m2.g-1, respectively. The FTIR spectra clearly confirmed the presence of carbonate anions in the structure of the LDHs. Adsorption experiments for Indigo Carmine (IC), as the main model organic pollutant in this study from aqueous solution onto synthetized samples were carried out in terms of solution pH, contact time and initial dye concentration. Experimental results indicate that the capacity of dye uptake augmented rapidly within the first 15, 40, and 55 minuts for Zn-Fe-CO3, Zn-Cr-CO3 and Zn-Al-CO3 respectively and then stayed practically the same regardless of the concentration. Adsorption kinetics studies revealed that the adsorption process followed pseudo-second order kinetics model instead of a pseudo-first-order model. The adsorption isotherm data follow the Langmuir equation in which parameters are calculated. The maximum Langmuir monolayer adsorption capacities were 94.87, 21.79, and 66.71 mg.g-1, respectively, for Zn-Fe-CO3, Zn-Cr-CO3, and Zn-Al-CO3. The adsorption capacities were slightly influenced by the pH variations from 5 to 10, showing the advantage of using these materials in water treatments in a wide pH range. Finally, the IC removal is proven by the presence of IC functional groups in IR spectra and thermograms. TGA/DSC of Zn-Fe-CO3 obtained after removal of IC indicate that the LDHs stabilizes IC and delays the combustion of adsorbed molecules. Copyright © 2020 BCREC Group. All rights reserved

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“…Thus, adsorption type of these adsorbent is similar. The isotherm adsorption of Freundlich and Langmuir was calculated based on data in Figure 5c using equation as below [32]. Langmuir equation:…”

Section: Methodsmentioning

confidence: 99%

Unique Adsorption Properties of Malachite Green on Interlayer Space of Cu-Al and Cu-Al-SiW12O40 Layered Double Hydroxides

Palapa

Juleanti

Normah

et al. 2020

Bull. Chem. React. Eng. Catal.

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Cu-Al layered double hydroxide (LDH) was intercalated with Keggin ion of polyoxometalate K4[a-SiW12O40] to form Cu-Al-SiW12O40 LDH. The obtained materials were analyzed by X-ray Diffraction (XRD), Fourier Transform Infra Red (FTIR) spectroscopy, and Brunaur-Emmett-Teller (BET) surface area analysis. Furthermore, the materials were used as adsorbents of malachite green from aqueous solution. Some variables for adsorption, such as: effect of adsorption times, malachite green concentration, and also adsorption temperature, were explored. The results showed that diffraction at 11.72° on Cu-Al LDH has interlayer distance of 7.56 Å. The intercalation of that LDH with [a-SiW12O40]4− ion resulted increasing interlayer distance to 12.10 Å. The surface area of material was also increased after intercalation from 46.2 m2/g to 89.02 m2/g. The adsorption of malachite green on Cu-Al and Cu-Al-SiW12O40 LDHs followed pseudo second order kinetic and isotherm Langmuir model with adsorption capacity of Cu-Al and Cu-Al-SiW12O40 LDHs was 55.866 mg/g and 149.253 mg/g, respectively. That adsorption capacity is equal with increasing interlayer space and surface area properties of material after intercalation. Thus, the adsorption of malachite green on Cu-Al and Cu-Al-SiW12O40 LDHs is unique and dominantly occurred on interlayer space of LDH as active site adsorption. Copyright © 2020 BCREC Group. All rights reserved

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Acid Green 1 removal from wastewater by layered double hydroxides

Cited by 15 publications

References 30 publications

In Situ Diffuse Reflectance Infrared Fourier-Transform Spectroscopy Investigation of Fluoroethylene Carbonate and Lithium Difluorophosphate Dual Additives in SEI Formation over Cu Anode

In Situ Diffuse Reflectance Infrared Fourier-Transform Spectroscopy Investigation of Fluoroethylene Carbonate and Lithium Difluorophosphate Dual Additives in SEI Formation over Cu Anode

Zn-M-CO3 Layered Double Hydroxides (M=Fe, Cr, or Al): Synthesis, Characterization, and Removal of Aqueous Indigo Carmine

Unique Adsorption Properties of Malachite Green on Interlayer Space of Cu-Al and Cu-Al-SiW12O40 Layered Double Hydroxides

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