Ferrous oxalate, maghemite and hematite nanorods as efficient adsorbents for decontamination of Congo red dye from aqueous system

Dhal, Jyoti Prakash; Mishra, Braja Gopal; Hota, Garudadhwaj

doi:10.1007/s13762-014-0535-x

Cited by 39 publications

(7 citation statements)

References 50 publications

(47 reference statements)

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“…Sriram et al [ 43 ] successfully explored the application of Mg–Al-Layered Double Hydroxide (LDH) modified diatoms for the highly efficient removal of CR from aqueous solution. Dhal et al [ 44 ] compared the use of ferrous oxalate, maghemite, and hematite nano-rods for the effective removal of CR dye from aqueous solution. The majority of these studies were using commercially sourced materials to synthesise the adsorbents which pose serious ecological challenges when these materials are depleted.…”

Section: Introductionmentioning

confidence: 99%

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Muedi

Masindi

Maree³

et al. 2022

Nanomaterials

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This study presents the first known exploration of Congo red dye (CR) adsorption by a polycationic Fe/Al Di-metal nanostructured composite (PDFe/Al) synthesised using Fe(III) and Al(III) recovered from authentic acid mine drainage (AMD). The PDFe/Al successfully removed CR from the aqueous solution. The mineralogical, microstructural, and chemical properties of the synthesised PDFe/Al adsorbent (before and after adsorption) were studied using state-of-the-art analytical instruments. The optimum conditions were observed to be 100 mg·L−1 CR, 1 g of the PDFe/Al in 500 mL adsorbate solution, 20 min of shaking, pH = 3–8, and a temperature of 35 °C. At optimised conditions, the PDFe/Al showed ≥99% removal efficacy for CR dye and an exceptionally high Langmuir adsorption capacity of 411 mg·g−1. Furthermore, a diffusion-limited adsorption mechanism was observed, with two distinct surfaces involved in the adsorption of CR from an aqueous solution. It was determined that the adsorption of CR induced internal strain and deformation within the matrices and interlayers of the PDFe/Al which resulted in a marked increase in the adsorbent pore surface area and pore volume. The remarkably high adsorption capacity could be attributed to the high surface area. A regeneration study showed that the adsorbent could be reused more than four times for the adsorption of CR. The findings from this study demonstrated the feasibility of recovering valuable minerals from toxic and hazardous AMD and demonstrated their potential for the treatment of industrial wastewaters.

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Section: Introductionmentioning

confidence: 99%

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Muedi

Masindi

Maree³

et al. 2022

Nanomaterials

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“…The diffused Raman peaks for the γ-phase implies a weak and broad scattering response of the vacancy-dispersed spinel system [44]. Both samples exhibit strong absorption characteristics for sub-600 nm wavelengths [22,53], see figure S7(b). The (allowed) direct bandgap (E g ) is conventionally calculated from the Tauc's plot by employing the following equation:…”

Section: Rudimentary Structural Characterizationsmentioning

confidence: 99%

“…Amongst these, hematite (α − Fe 2 O 3 ) and maghemite (γ − Fe 2 O 3 ) are two abundant, inexpensive yet promising ferric oxide polymorphs. They embrace diverse applications in the fields of targeted drug delivery for hyperthermia treatment, magnetic resonance imaging, memory devices and magnetic nanofluids, magnetomechano-electrical energy conversion, dye solar cells, Li-ion batteries, alcohol sensing and catalysis, waste water remediation, etc [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. In this context dielectric transcendence is a multifaceted asset, and persists at the forefront of the development of 'bane to boon' performance [10,12,13].…”

Section: Introductionmentioning

confidence: 99%

Field-enhanced polarization in polytype ferric oxides: confronting anisotropy in dielectric ellipsoid dispersion

Bhattacharjee¹,

Banerjee²,

Chattopadhyay³

2021

J. Phys. D: Appl. Phys.

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An analytic dielectric introspection in two cardinal ferric oxide polymorphs, viz. hematite and maghemite, is conducted using a three-fold line of direction. Firstly, dc field-dependent radio/audio-frequency impedance and dielectric spectra of polycrystalline MIM pellets, comprising near-stoichiometric (meticulously characterized) α , γ − Fe2O3 nanoparticles, are analysed by employing the Cole–Davidson model, Jonscher’s power law and equivalent circuitry to quantify non-Debye dipolar relaxations, small polaron hopping conduction, grain core–boundary resistivity correlations and field-driven delocalization/de-trapping of carriers. Bias-tuned low-frequency enhancement of the dielectric constant by augmenting Maxwell–Wagner polarization is demonstrated for both samples, a prerequisite for conquering classical energy-storage bottleneck. Secondly, the optical dielectric function and associated parameters are evaluated under a density functional theory + U framework, to physically designate particular resonant absorption, dissipation, electronic polarization and decay. In doing so, a new crystallographically consistent and energetically stable vacancy-ordered maghemite-type supercell is constructed to accomplish reasonable computational cost. Thirdly, intrinsic anisotropy in materials sensitive to photonic excitations is videographed by simulating energy-dispersive evolution of the quadric surface to project real/imaginary dielectric tensors. The authors anticipate that this intensive technique will pictorially demonstrate anisotropic deviations in the dielectric ellipsoid, fostering materials physics over linear and nonlinear dielectrics.

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“…By using ferrous oxalate as a precursor for thermal decomposition, due to the "morphology genetic effect", [11,17] iron oxides with similar morphology can be obtained Iron oxide has a high theoretical specific capacity and is a potential anode material for supercapacitors. [18,19] The tubular structure can effectively increase the active sites of iron oxides and improve its electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Morphological Regulation Mechanism of Tubular Ferrous Oxalate: Theoretical and Experimental Study

Chen

et al. 2023

ChemistrySelect

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The formation mechanism and morphology regulation mechanism of tubular ferrous oxalate were investigated by density functional theory. The calculation results showed that the pH value of the reaction solution changed from slightly alkaline to acidic was an important condition for the formation of tubular ferrous oxalate. The size and dispersion of ferrous oxalate can be controlled by introducing Na + and ethylene glycol (EG) into the reaction system. Guided by theoretical calculations, using sodium oxalate as material to guarantee the initial solution to be slightly basic, while also introducing Na + . Regular tubular ferrous oxalate was successfully obtained by using different ratios of EG and H 2 O as reaction solution and adjusting pH values at different stages, verified the rationality of the theoretical calculation results. The tubular ferric oxide was obtained by thermal decomposition using tubular ferrous oxalate as the precursor, and the electrochemical performance test results showed that this material is a potential electrode material for supercapacitors.

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Ferrous oxalate, maghemite and hematite nanorods as efficient adsorbents for decontamination of Congo red dye from aqueous system

Cited by 39 publications

References 50 publications

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Effective Adsorption of Congo Red from Aqueous Solution Using Fe/Al Di-Metal Nanostructured Composite Synthesised from Fe(III) and Al(III) Recovered from Real Acid Mine Drainage

Field-enhanced polarization in polytype ferric oxides: confronting anisotropy in dielectric ellipsoid dispersion

Morphological Regulation Mechanism of Tubular Ferrous Oxalate: Theoretical and Experimental Study

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