Adsorption characteristics of arsenate on colloidal nanosheets of layered double hydroxide

Koilraj, Paulmanickam; Takaki, Yu; Sasaki, Keiko

doi:10.1016/j.clay.2016.06.002

Cited by 24 publications

(6 citation statements)

References 44 publications

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“…The chemical composition of LDHs are generally represented as [M(II) 1‐x M(III) x (OH) 2 ] x+ (A n− ) x/n ⋅mH 2 O, where M(II) is a divalent metal ion, M(III) is a trivalent metal ion, and A n− is the interlayer anion. The applicability of LDHs for environmental remediation is an interesting area of research due to its high anion exchange capacity (∼3 meq/g for LDHs containing Mg/Al atomic ratio 3), easy preparation methods and cost effectiveness . However, the major drawback associated with these materials is CO 2 contamination during synthesis .…”

Section: Introductionsupporting

confidence: 91%

Eco‐Friendly Alkali‐Free Arginine‐Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

Koilraj

Sasaki

2017

ChemistrySelect

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A new one‐pot synthesis of highly crystalline MgAl‐, CoAl‐ and ZnAl‐layered double hydroxides (LDHs) containing NO3− as interlayer anion along with the surface functionalization of L‐arginine was demonstrated by the ecofriendly alkali‐free arginine‐assisted hydrothermal method to examine the adsorptive reduction of chromate (CrO42−) from aqueous solutions. The amino acid mediated water hydrolysis resulted abundant OH− in the medium, which served as precipitant, and the NO3− from metal precursor acts as an interlayer anion along with surface functionalization of amino acid. Adsorption studies revealed that the removal of CrO42− by anion exchange was the greatest in MgAl‐LDH with 1.619 mmol‐Cr/g of LDH. The mechanism of CrO42− removal was due to the ion‐exchange of NO3− from the interlayer as well as the counter anions present on the functionalized arginine cation. The adsorbed CrO42− was partially reduced to nontoxic Cr3+ on the surface of LDH due to the presence of amino acid functionalization. The present technique provides several advantages from the aspect of sustainable chemistry: (i) avoiding hazardous alkali for the preparation of LDH, (ii) removal of CrO42− by ion‐exchange and (iii) partial detoxification of CrO42− by reduction to Cr3+ on the surface of the LDH.

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Section: Introductionsupporting

confidence: 91%

Eco‐Friendly Alkali‐Free Arginine‐Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

Koilraj

Sasaki

2017

ChemistrySelect

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“…In literature, several studies have described the adsorption of dyes by LDH compounds (Jia et al, 2015;Shan et al, 2015;Koilraj et al, 2016;Yang et al, 2016). El Gaini et al (2009) showed the efficiency of calcined MgAl-LDH in the removal of Indigo Carmine (IC) dye from aqueous solutions.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Acid Yellow 42 dye on calcined layered double hydroxide: Effect of time, concentration, pH and temperature

Santos

Gonçalves

Constantino

et al. 2017

Applied Clay Science

155

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The adsorption of textile dyes onto Layered Double Hydroxides (LDH) and their thermally decomposed products is a promising strategy for the treatment of contaminated effluents-combining high removal efficiency with reasonable cost. The main purpose of this paper was to investigate the adsorption of textile azo dye Acid Yellow 42 (AY) onto calcined and uncalcined Mg-Al-CO 3-LDH. A set of analytical techniques was used to characterize the materials, namely X-ray diffraction (XRD), Attenuated Total Reflectance Fourier Transform Infrared Spectroscopy (ATR-FTIR), thermogravimetric analyses (TGA), N 2 adsorption-desorption isotherms and Scanning Electron Microscopy (SEM). In the study of azo dye adsorption, the following factors were assessed: kinetics, adsorption capacity, effect of temperature, initial pH value, and recyclability of the adsorbent material. The adsorption capacity of calcined LDH (CLDH) was almost four times greater than that of the LDH precursor: 1266 mg•g −1 (1.669 mmol•g −1) and 330.0 mg•g −1 (0.4350 mmol•g −1), respectively, at pH equal to 7.0 and 25°C. The greater adsorption capacity for CLDH is related to the recovery property of these materials in light of the so called "memory effect", which allows an intercalation process of the anionic dye, as demonstrated by XRD data.

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“…Layered double hydroxides (LDHs) are a type of synthetic anionic clay that has a high anion exchange capacity (AEC ∼ 3 mequiv/g), labile interlayer anions, and large surface area. LDHs are widely used as catalysts, catalyst supports, and environmental materials. , C-dot supported on LDH could enhance handling efficacy and could add an additional functionality (anion removal). The unitization of C-dot as a functional component for the remediation of aqueous pollutants is scarce except the C-dot fabricated on MgAl-LDH and MgFe-LDH for dye and Pb 2+ removal, respectively.…”

Section: Introductionmentioning

confidence: 99%

Carbon-Dot-Decorated Layered Double Hydroxide Nanocomposites as a Multifunctional Environmental Material for Co-immobilization of SeO₄^2– and Sr²⁺ from Aqueous Solutions

Koilraj

Kamura

Sasaki

2017

ACS Sustainable Chem. Eng.

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Co-immobilization of cationic and anionic radionuclides is highly desirable for total remediation of radioactive wastewater. Carbonaceous nanomaterials have received much attention in the field of water remediation and pollution control in recent years. However, the handling of these nanomaterials is challenging due to increased bioavailability and toxicity. In this work, MgAl-NO3 layered double hydroxide (LDH) was synthesized and modified using carbon nanodots (C-dot). The prepared materials were characterized using powder X-ray diffraction (PXRD), Fourier transform infrared (FT-IR), zeta potential, and transmission electron microscopy (TEM) observation. Adsorption of SeO4 2– and Sr2+ on MgAl-NO3-LDH/C-dot composites showed that the Sr2+ immobilization capacities increased with an increase in the amount of C-dot. The mechanism of Sr2+ adsorption on these composites occurs via coordination with the −COO– group of C-dot, whereas that of SeO4 2– occurs through ion exchange with NO3 – in the interlayer galleries of LDH. The adsorption of Sr2+ and SeO4 2– was enhanced in both bicomponent (Sr2+ + SeO4 2–) and tricomponent systems (Sr2+ + SeO4 2– + M+/M2+ = coexisting cations or A n– = coexisting anions) with the presence of other anion and cations. The MgAl-NO3-LDH/C-dot composites demonstrated that the high adsorption efficiency of Sr2+ and SeO4 2– than most of other materials reported. These results demonstrate that MgAl-NO3-LDH/C-dot composites are an effective adsorbent for total remediation of anionic and cationic radioactive nuclides from wastewater.

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Adsorption characteristics of arsenate on colloidal nanosheets of layered double hydroxide

Cited by 24 publications

References 44 publications

Eco‐Friendly Alkali‐Free Arginine‐Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

Eco‐Friendly Alkali‐Free Arginine‐Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

Adsorption of Acid Yellow 42 dye on calcined layered double hydroxide: Effect of time, concentration, pH and temperature

Carbon-Dot-Decorated Layered Double Hydroxide Nanocomposites as a Multifunctional Environmental Material for Co-immobilization of SeO₄^2– and Sr²⁺ from Aqueous Solutions

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Adsorption characteristics of arsenate on colloidal nanosheets of layered double hydroxide

Cited by 24 publications

References 44 publications

Eco‐Friendly Alkali‐Free Arginine‐Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

Eco‐Friendly Alkali‐Free Arginine‐Assisted Hydrothermal Synthesis of Different Layered Double Hydroxides and Their Chromate Adsorption/Reduction Efficiency

Adsorption of Acid Yellow 42 dye on calcined layered double hydroxide: Effect of time, concentration, pH and temperature

Carbon-Dot-Decorated Layered Double Hydroxide Nanocomposites as a Multifunctional Environmental Material for Co-immobilization of SeO42– and Sr2+ from Aqueous Solutions

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Carbon-Dot-Decorated Layered Double Hydroxide Nanocomposites as a Multifunctional Environmental Material for Co-immobilization of SeO₄^2– and Sr²⁺ from Aqueous Solutions