Facile additive-free synthesis of hematite nanoparticles for enhanced adsorption of hexavalent chromium from aqueous media: Kinetic, isotherm, and thermodynamic study

Debnath, Animesh; Bera, Arun; Chattopadhyay, Kalyan Kumar; Saha, Biswajit

doi:10.1080/24701556.2017.1357581

Cited by 28 publications

(20 citation statements)

References 34 publications

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“…The thermodynamic activation parameters of AO‐PANF towards Cr (VI), including the Gibbs free energy Δ G (KJ.mol −1 ), the enthalpy change Δ H (KJ.mol −1 ) and the entropy change Δ S (J.K −1 .mol −1 ) were calculated using van't Hoff Equations :

italicΔG = - italicRT \ln K_{d}

In K_{d} = - \frac{ΔH}{RT} + \frac{ΔS}{R}

…”

Section: Resultsmentioning

confidence: 99%

Synthesis of amidoximated polyacrylonitrile fibers and its use as adsorbent for Cr (VI) ions removal from aqueous solutions

Bouchoum

Benmoussa

Jada

et al. 2019

Env Prog and Sustain Energy

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Functionalized fibers, especially polyacrylonitrile fibers (PANF), have attracted wide interest as an effective and economical material for environment and water protection. In this study, polyacrylonitrile fibers modified with hydroxylamine hydrochloride were used as an adsorbent to remove hexavalent chromium ions from aqueous solutions. The novelty of the present study compared to the literature is the functionalization of polyacrylonitrile fibers surface by optimizing cost and energy while achieving a yield fast removal rate and high adsorption capacity of hexavalent chromium from aqueous solutions. The amidoximated polyacrylonitrile fibers were characterized using Fourier Transform InfraRed spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The results confirmed the success of polyacrylonitrile fibers modification. The adsorption capacity was evaluated by investigating the effect of initial pH solution ranging from 2.0 to 7.0, the adsorbent dose varied from 0.05 to 0.25 g, the initial Cr (VI) concentration range was (5–70 mg g−1), the temperature varied from 5 to 60°C, and the contact time ranged from 0 to 180 min. We have used the Langmuir and Freundlich adsorption models to describe the equilibrium sorption data. The maximum adsorption capacity estimated using the Langmuir model reached 32. 57 mg g−1 under optimal conditions. The thermodynamic parameters (ΔG, ΔH, and ΔS) were also determined. In addition, the adsorbent showed a desorption rate of Cr (VI) up to 92% with 0.5 mol of NaOH, which can be reused for three adsorption–desorption cycles. The overall data showed the efficiency of amidoximated polyacrylonitrile fibers in removing Cr (VI) from aqueous solutions. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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italicΔG = - italicRT \ln K_{d}

In K_{d} = - \frac{ΔH}{RT} + \frac{ΔS}{R}

…”

Section: Resultsmentioning

confidence: 99%

Synthesis of amidoximated polyacrylonitrile fibers and its use as adsorbent for Cr (VI) ions removal from aqueous solutions

Bouchoum

Benmoussa

Jada

et al. 2019

Env Prog and Sustain Energy

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“…The characteristic Fe-O stretching mode is evident at about 500-560 cm −1 [46][47][48][49][50]. The wide band found at 3211 cm −1 and at 1630 cm −1 are each assigned to the O-H stretch and H-O-H bending vibration modes respectively due to adsorbed water on the surface [46][47][48][49][50]. These peaks are pronounced only with the sample immersed in Cr(VI) solution.…”

Section: Adsorptive Removal Of Cr(vi) By α-Fe 2 O 3 Nanobladesmentioning

confidence: 95%

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Aquino

Balela

2020

SN Appl. Sci.

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This work presents a facile method of growing zinc-doped α-hematite (Zn-doped α-Fe 2 O 3) nanostructures via thermal oxidation of Fe sheet in the presence of Zn 2+ mist. Both undoped and Zn-doped α-Fe 2 O 3 nanostructures exhibit blade-like morphology mixed with some nanowires. In general, smaller yet denser nanostructures are formed at higher oxidation temperatures. On the other hand, misting (water vapor) enhances the oxidation rate, leading to larger nanoblades. Raman and energy dispersive X-ray spectroscopy reveal the successful incorporation of Zn in the α-Fe 2 O 3 lattice. However, excessive Zn 2+ (0.01 M) promotes the formation of large Zn hydroxide chloride particles on top of the α-Fe 2 O 3 nanoblades. The undoped α-Fe 2 O 3 nanostructures prepared at 650 °C in water vapor effectively adsorb hexavalent chromium [Cr(VI)] in aqueous solution with about 95% removal efficiency. The sample oxidized in 0.005 M Zn 2+ mist is also efficient in the Fenton-assisted photodegradation of methyl orange with > 90% removal even after five degradation cycles.

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“…[21][22][23][24][25][26][27][28] Several adsorbents such as chitosan and its composites, granular ferric hydroxide, 29 nanoparticles and nanocomposites, bimetallic nanoparticles, and graphene and its composites have been used efficiently for removal of recalcitrant pollutant in recent years. [30][31][32][33][34] Debnath and his coworker have studied ultrasound-assisted adsorption of recalcitrant pollutant from wastewater. Ultrasound process enhances kinetics as well as the yield of the adsorption process.…”

Section: Introductionmentioning

confidence: 99%

Adsorptive degradation of hexavalent chromium from aqueous solution using coconut shell as a green adsorbent

Bal

Bhasarkar²

2021

Env Prog and Sustain Energy

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The present study aimed to remove the heavy metal compounds present in wastewater. In this study, we used hexavalent chromium Cr (VI) as a heavy metal compound, and coconut shell was used as a promising green bio-sorbent to remove Cr (VI) from wastewater. Coconut shells are readily available and are termed as waste materials. Various parameters such as contact time, pH of the solution, initial Cr (VI) concentration, and amount of coconut shell were studied. The adsorption data were fitted with various isotherm models. The Langmuir and Freundlich isotherm models were the best fit for the experimental data, and the maximum adsorption capacity was found to be 16.39 and 12.19 mg/g, respectively. Kinetic and thermodynamic studies were performed to assess the feasibility of the process. The pseudo-second-order kinetic model is also signified that the Cr (VI) adsorbent capacity was due to particle diffusion. To identify the morphological properties of the adsorbent various analysis such as Scanning Electron microscope (SEM) and BET surface area were performed. The experimental results and rate of adsorption, and the adsorption process was found to be feasible and endothermic in nature.

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Facile additive-free synthesis of hematite nanoparticles for enhanced adsorption of hexavalent chromium from aqueous media: Kinetic, isotherm, and thermodynamic study

Cited by 28 publications

References 34 publications

Synthesis of amidoximated polyacrylonitrile fibers and its use as adsorbent for Cr (VI) ions removal from aqueous solutions

Synthesis of amidoximated polyacrylonitrile fibers and its use as adsorbent for Cr (VI) ions removal from aqueous solutions

Thermally grown Zn-doped hematite (α-Fe2O3) nanostructures for efficient adsorption of Cr(VI) and Fenton-assisted degradation of methyl orange

Adsorptive degradation of hexavalent chromium from aqueous solution using coconut shell as a green adsorbent

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