Innovative oxidation and kinetic studies of ferrous ion by sodium ferrate (VI) and simultaneous removal of metals from a synthetic acid mine drainage

Munyengabe, Alexis; Zvinowanda, Caliphs; Zvimba, John Ngoni; Ramontja, James

doi:10.1016/j.pce.2020.102932

Cited by 10 publications

(8 citation statements)

References 33 publications

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“…The optimum conditions followed during the treatment of real AMD are presented in Table 3 and more details could be found in Munyengabe et al [15].…”

Section: Optimization Of Parametersmentioning

confidence: 99%

“…Firstly, ferrate (VI) ion can be synthesized through an electrochemical technique using an iron-based anode in a strongly alkaline medium [11][12][13]. Secondly, ferrate (VI) salt can be synthesized through a wet oxidation method, which integrates the oxidation of iron sources, such as ferric chloride or ferrous sulphate by hypochlorite (OCl − ) ions in an alkaline solution [14,15]. Lastly, it can be produced using a dry oxidation or thermal method [16] or solid-phase reaction method at room temperature [17].…”

Section: Introductionmentioning

confidence: 99%

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Effective Desalination of Acid Mine Drainage Using an Advanced Oxidation Process: Sodium Ferrate (VI) Salt

Munyengabe

Zvinowanda

Ramontja

et al. 2021

Water

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The screening and treatment of acid mine drainage (AMD) using Na2FeO4 was explored. Elemental composition was performed, using an Inductively Coupled Plasma-Optical Emission Spectroscopy (ICP-OES) for the raw and treated AMD. The AMD samples were collected from three different sampling sites:(Raw Tailing Water 1 (RTW1), Raw Tailing Water 2 (RTW2) and Raw Tailing Water 3 (RTW3)) in Pretoria, South Africa, with acidic pH ranging between 2.50 and 3.13. Total dissolved solids and the electrical conductivity of AMD samples ranged between 960 and 1000 mg L−1, 226 and 263 µS. cm−1, respectively. The final pH of treated water samples increased up to ≥9.5 after treatment with sodium ferrate (VI) (Na2FeO4). Liquid Na2FeO4 was quantitatively produced through a wet oxidation method and was fully characterized, using Fourier Transform Infra-Red (FTIR), X-ray Diffraction spectroscopy (XRD) and UV-Vis instruments. Na2FeO4 showed dual functions by removing metals and raising the pH of the treated water. Concentrations of most trace elements did not comply with WHO and DWAF guideline standards in raw AMD while after treatment with Na2FeO4, the concentrations were below guidelines for domestic and irrigation purposes.

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“…The optimum conditions followed during the treatment of real AMD are presented in Table 3 and more details could be found in Munyengabe et al [15].…”

Section: Optimization Of Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effective Desalination of Acid Mine Drainage Using an Advanced Oxidation Process: Sodium Ferrate (VI) Salt

Munyengabe

Zvinowanda

Ramontja

et al. 2021

Water

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“…Operating optimum conditions for oxidation of Fe 2+ including the effect of volumes of Fe 2+ solution and ferrate (VI), contact time, pH, and initial concentrations of ferrate are presented in Table 1 (Munyengabe et al, 2020). The concentrations of metals were determined using ICP-OES (iCap 6500 Duo, Thermo Scientific, UK) before and after oxidation process to check if ferrate (VI) ions could reduce or completely remove them from synthetic AMD.…”

Section: Optimum Conditionsmentioning

confidence: 99%

Quantification and characterization of the sludge generated from synthetic acid mine drainage treatment using sodium ferrate (VI) as an advance oxidation process

Munyengabe

Zvinowanda

Ramontja

et al. 2021

Preprint

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A major problem in the active treatment of acid mine drainage (AMD) is the generation of large volumes of sludge through pH neutralization, oxidation of iron (II) and subsequent metal precipitation. The sludge settling rate, sludge volume index (SVI) and sedimentation process are ones of parameters identifying a good treatment of AMD. Sodium ferrate (VI) (Na2FeO4) is one reagent currently used to treat water due to its quick reaction rate, easy implementation and relatively low chemical and operational costs. However, very limited information is available in the literature related to the detailed characterization and dewaterability of Na2FeO4-treated AMD sludge. This study aimed at characterizing and monitoring settling rate and densification process of synthetic AMD sludge after treatment with Na2FeO4. The results confirmed a complete removal of iron from the synthetic AMD due to high oxidation strength of ferrate (VI) in acidic medium (Eᵒ = 2.2V) and showed the presence of different minerals formed in the sludge after treatment. The concentrations of the sludge collected at different intervals were justified by the densification process and high density of the sludge was obtained after 25 minutes while high weight percent of iron was found at 10 min and Fe and O dominated other elements in the sludge. The study demonstrated very good settling properties of the sludge and the low SVI value ranging between 30 and 60 mL/g TSS.

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“…Here, the toxic materials stick to the surface of the water-insoluble adsorbent pores. Inexpensive and natural adsorbents use instead of the expensive commercial activated carbon is necessary (Munyengabe et al, 2020).…”

Section: Preparation Of the Modified Adsorbentsmentioning

confidence: 99%

Optimizing modified rice bran for treating aqueous solutions polluted by Cr (VI) ions: isotherm and kinetics analyses

Ameri

Hoodaji

Rajaei

et al. 2021

qas

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This study investigated the possibility and efficiency of absorbing chromium (VI) (Cr [VI]) ions from the polluted solutions by employing the chemically modified adsorbents (alkali, biochar, and acid rice bran), focusing on the possible impacts of the solution’s pH values, adsorbent’s dosages, concentrations, and contact times. The colori-metric method was used for Cr determination by employing an ultraviolet/visible spectrophotometer. The scanning electron microscope and Fourier transform infrared spectroscopy were used to analyze the characteristics of the modified adsorbents. The findings indicated that the optimized acid, biochar, alkali, and unmodified rice bran removal efficiency for Cr (VI) were 94.50%, 94.27%, 88.60%, and 90.18%, respectively. The increase of adsorbent dosage up to 2 g/L led to a rise in removal effectiveness (82.06%). Furthermore, the highest removal efficiency was obtained (94%) at the pH of 2.0, the contact duration of 100 min, Cr (VI) concentration of 50 mg/L, and dosage of 2 g/L, which was statistically the optimal condition for the modified rice bran. The adsorption kinetics was agreeably suited to pseudo-second-order, whereas the Freundlich isotherm equation was also suitably expounded the study’s findings. The findings implied that the acid and biochar rice bran performed remarkably in the reme-diation of the wastewater compared with alkali rice bran for reuse for industrial, agricultural, and environmental purposes.

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Innovative oxidation and kinetic studies of ferrous ion by sodium ferrate (VI) and simultaneous removal of metals from a synthetic acid mine drainage

Cited by 10 publications

References 33 publications

Effective Desalination of Acid Mine Drainage Using an Advanced Oxidation Process: Sodium Ferrate (VI) Salt

Effective Desalination of Acid Mine Drainage Using an Advanced Oxidation Process: Sodium Ferrate (VI) Salt

Quantification and characterization of the sludge generated from synthetic acid mine drainage treatment using sodium ferrate (VI) as an advance oxidation process

Optimizing modified rice bran for treating aqueous solutions polluted by Cr (VI) ions: isotherm and kinetics analyses

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