Kinetics of Cr(VI) removal by Mg–Al layered double hydroxide doped with Fe2+

Kameda, Tomohito; Kondo, Eisuke; Yoshioka, Toshiaki

doi:10.1016/j.jwpe.2014.09.011

Cited by 12 publications

(6 citation statements)

References 15 publications

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“…The unusual atomic ratio may be due to the formation of the invisible amorphous AlOOH phase during synthesis, which may be present under the detection limit of PXRD. The 27 Al MAS‐NMR spectrum of ZnAl‐LDH indeed confirmed that the presence of two peaks at 15.9 and 12.2 ppm corresponding to octahedral coordination of Al (Al) present in the LDH lattice and AlOOH, respectively (Figure D) ,. The above results suggest that in the ZnAl‐LDH, the precipitation of Zn was not favorable under the synthetic conditions.…”

Section: Resultssupporting

confidence: 55%

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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: Resultssupporting

confidence: 55%

“…Numerous methods have been employed for the removal of Cr(VI) from wastewater, such as adsorption,, ion‐exchange,, chemical precipitation and coagulation, among others. The sorption processes have gained much more attention due to their easy operation, high efficiency, economic viability and reduced waste for disposal.…”

Section: Introductionmentioning

confidence: 99%

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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“…Recently, LDH-containing magnetic-hybrid nanomaterials have been explored for wastewater treatment due to their easy separation after the adsorption process [ 100 , 101 , 102 , 103 ]. The mechanism of the adsorption of water pollutants on magnetic LDH hybrids involves ion exchange, precipitation, surface modifications, and chelation.…”

Section: The Adsorption Of Heavy Metals and Organic Dyesmentioning

confidence: 99%

“…The incorporation of magnetic nanoparticles into the layers of LDH improves adsorption capacity, and their magnetic properties facilitate the separation of the LDH adsorbent after the adsorption process. The LDH-containing magnetic nanoparticles showed a high adsorption capacity of 262.27 mg g −1 for As(V) [ 101 ], 649.87 mg/g for Cr(VI) and 528 mg g −1 for methyl orange [ 102 , 103 ]. The addition of carbon-based components to the LDH layer, along with the magnetic nanoparticle Fe 3 O 4 , resulted in a novel adsorbent that can adsorb a large quantity of pollutants [ 104 , 105 ].…”

Section: The Adsorption Of Heavy Metals and Organic Dyesmentioning

confidence: 99%

Nanostructured Materials for Water Purification: Adsorption of Heavy Metal Ions and Organic Dyes

Choi

Lee

2022

Polymers

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Chemical water pollution poses a threat to human beings and ecological systems. The purification of water to remove toxic organic and inorganic pollutants is essential for a safe society and a clean environment. Adsorption-based water treatment is considered one of the most effective and economic technologies designed to remove toxic substances. In this article, we review the recent progress in the field of nanostructured materials used for water purification, particularly those used for the adsorption of heavy metal ions and organic dyes. This review includes a range of nanostructured materials such as metal-based nanoparticles, polymer-based nanomaterials, carbon nanomaterials, bio-mass materials, and other types of nanostructured materials. Finally, the current challenges in the fields of adsorption of toxic materials using nanostructured materials are briefly discussed.

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“…The reported Cr(VI) removal methods include bioremediation technology, electrokinetic remediation, chemical precipitation processes, adsorption approaches, membrane separation technology, and chemical redox reactions. [8][9][10] However, the most convenient and conventional method is chemical redox. Dittert and coworkers 11 used Laminaria digitata macro-algae to reduce and adsorb Cr(VI), and reported that the maximum Cr(VI) reduction capacity was 2.1 mmol g À1 algae.…”

Section: Introductionmentioning

confidence: 99%

Cr(vi) removal by combined redox reactions and adsorption using pectin-stabilized nanoscale zero-valent iron for simulated chromium contaminated water

et al. 2015

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11The synthetic pectin-stabilized nanoscale zero-valent iron was used to remove Cr(Ⅵ) 12 from simulated chromium contaminated water. The Cr(Ⅵ) removal data were well 13 fitted with the pseudo-first order kinetic equation. The observed pseudo-first order 14 rate constant for Cr(Ⅵ) removal decreased from 0.0781 to 0.0413 min -1 when pH 15 increased from 3 to 9. When initial Cr(Ⅵ) concentration increased from 20 to 80 16 mg/L, the observed pseudo-first order rate constant decreased from 0.0645 to 0.0366 17 min -1 . The Cr(Ⅵ) removal efficiency had obvious increases with the dose of 18 pectin-stabilized nZVI increased from 0.02 to 0.10 g, and it increased from 0.0276 to 19 0.1159 min -1 with temperature increased from 15 to 35 °C. The scanning electron 20 microscope (SEM) images proved that the presence of pectin successfully stabilized 21 the nZVI particles and thus increased the BET specific surface area of nZVI. Fourier

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Kinetics of Cr(VI) removal by Mg–Al layered double hydroxide doped with Fe2+

Cited by 12 publications

References 15 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

Nanostructured Materials for Water Purification: Adsorption of Heavy Metal Ions and Organic Dyes

Cr(vi) removal by combined redox reactions and adsorption using pectin-stabilized nanoscale zero-valent iron for simulated chromium contaminated water

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