A comparative study of acid‐treated, base‐treated, and Fenton‐like reagent‐treated biomass for Cr(VI) sequestration from aqueous solutions

Nchoe, Obakeng B.; Ntuli, Themba D.; Klink, Michael J.; Mtunzi, Fanyana M.; Pakade, Vusumzi Emmanuel

doi:10.1002/wer.1421

Cited by 11 publications

(7 citation statements)

References 62 publications

(158 reference statements)

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“…The intra-particle diffusion, Elovich, pseudo-second order (PSO), and pseudo-first order (PFO) models were used to gain insights on the chemical reaction processes influencing the uptake of Cr(VI) in relation to time, mass transfer, and the rate-limiting step. [46] The non-linear equations of the PFO, PSO, and Elovich rate models are illustrated in Eqs. ( 6), (7), and ( 8).…”

Section: Data Treatmentmentioning

confidence: 99%

Reduction and Adsorption of Hexavalent Chromium by Iron Sulfide Loaded Biochar: Isotherms, Kinetics and Thermodynamics

Qhubu,

Lesaoana,

Nomngongo

et al. 2023

ChemistrySelect

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The removal of noxious Cr(VI) from water has gained worldwide attention. In this study, biochar derived from macadamia nut shells (MHP) was embedded with iron sulfide (FeS) nanoparticles produced through a solid‐phase reduction of pyrite. The MHP‐FeS composite was evaluated for the adsorption of Cr(VI) and its subsequent reduction to Cr(III). The scanning electron microscope images revealed that the particles were of irregular shape, while the energy dispersive spectroscopy results showed the existence of Fe, S, O, and C atoms. X‐ray diffraction peaks at 2=29.8°, 33.7°, 43.7°, and 53.1° were characteristic of the formation of FeS nanoparticles. A maximum Cr(VI) adsorption capacity of 4.95 mg/g was obtained at pH 3, 60 min, and 25 °C. The higher correlation coefficient (R2>0.873) and lower residual standard error (RSE=1.43) values pointed to the adsorption process favoring Langmuir and pseudo‐second‐order models. As per thermodynamic reaction calculations, the remediation process was spontaneous and endothermic. With further optimization, this material could be a potential adsorbent and reductant for Cr(VI) in water.

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Section: Data Treatmentmentioning

confidence: 99%

Reduction and Adsorption of Hexavalent Chromium by Iron Sulfide Loaded Biochar: Isotherms, Kinetics and Thermodynamics

Qhubu,

Lesaoana,

Nomngongo

et al. 2023

ChemistrySelect

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“…Several studies have demonstrated improved Cr (VI) adsorption performance due to pretreatment of the adsorbent surface. For instance, a study by Obakeng et al (2020) examined the Cr (VI) removal efficiency of macadamia nutshells treated with sodium hydroxide, nitric acid, and fenton-like reagents. The study findings revealed that the base-treated adsorbent demonstrated maximum Cr (VI) adsorption performance at 98% compared to the acid and fenton-treated adsorbent.…”

Section: Cr (Vi) Removal Studies By Low-cost Biomass and Agro-based A...mentioning

confidence: 99%

Chromium (VI) adsorption from steel industry wastewater using biomass and agro-based adsorbents: A Review

Joseph,

Isaiah,

Sammy

2023

jagst

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In recent years, increased steel production has resulted in an increased release of Cr (VI) effluent from electroplating processes. The current conventional technologies for Cr (VI) removal, for instance, chemical precipitation, ion exchange, membranes, and electrochemical technologies, have proven to be expensive and not eco-friendly. Adsorption using biomass or agro-based adsorbents has been demonstrated to be an eco-friendly method. In this study, the potential of several biomass and agro-based adsorbents for Cr (VI) removal from steel industry wastewater has been reviewed. The application of adsorption parameters, isotherms, and kinetic models has also been reviewed. The study review reveals that the maximum adsorption of Cr (VI) ions from wastewater was dependent on the pH, temperature, contact time, type of adsorbent material, and initial metal concentration. The literature review demonstrated that maximum Cr (VI) adsorption efficiency ranged from 90–100%, with optimum pH, contact time, and temperature ranging from 2–5, 30-180 min, and 25–30 °C, respectively. The equilibrium adsorption data was best described by the Langmuir and Freundlich isotherms and the pseudo-second-order kinetic model. The thermodynamic studies revealed that the adsorption process was spontaneous and endothermic. It has been found that biomass and agro-based adsorbents are potentially eco-friendly alternatives for Cr (VI) removal from industrial wastewater. However, several gaps have been identified to improve the Cr (VI) removal efficiency, spent adsorbent reuse and safe disposal, optimisation, and commercial application of agro-based adsorbents.

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“…The high IEP (pH 11.69) observed for AC-Fe3O4-SiO2-PEI was attributed to the cationic characteristic of PEI [38,39]. The pH of a solution affects the surface chemistry of adsorbents, ionization, and bioavailability of adsorbates [25,40]. Hence, the investigation of its influence on adsorption is crucial.…”

Section: Influence Of Solution Ph On Adsorption Of Cr(vi)mentioning

confidence: 99%

Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions

Qhubu

Nomngongo

Pakade

2021

Water

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The contamination of water resources by toxic hexavalent chromium remains a challenge. In this study, amino-functionalized iron oxide biobased carbon-silica composites were prepared through co-precipitation of Fe(II) and Fe(III) over Macadamia activated carbon and explored as feasible adsorbents for the removal of Cr(VI) from dilute aqueous solutions. The energy dispersive spectroscopy (EDS) elemental analysis confirmed the existence of Fe, Si, O, and C atoms, which form the backbone of the composite. The FTIR also showed the presence of Fe-O and Si-O-Si and Si-OH spectral bands, affirming the backbone of the adsorbents. Cr(VI) adsorption efficiency (5.76 mg/g) was achieved at pH 1 when an initial concentration of 2.5 mg/L, contact time of 90 min, and dosage concentration of 1.7 g/L were used. The data were best described by the Langmuir adsorption model and pseudo-second-order rate model. ΔG° (−3 to −12 kJ/mol) and ΔH° (46, 12 and 5 kJ/mol) values affirmed that the adsorption of Cr(VI) was spontaneous and endothermic and dominated by chemical interactions.

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A comparative study of acid‐treated, base‐treated, and Fenton‐like reagent‐treated biomass for Cr(VI) sequestration from aqueous solutions

Cited by 11 publications

References 62 publications

Reduction and Adsorption of Hexavalent Chromium by Iron Sulfide Loaded Biochar: Isotherms, Kinetics and Thermodynamics

Reduction and Adsorption of Hexavalent Chromium by Iron Sulfide Loaded Biochar: Isotherms, Kinetics and Thermodynamics

Chromium (VI) adsorption from steel industry wastewater using biomass and agro-based adsorbents: A Review

Exploring the Iron Oxide Functionalized Biobased Carbon-silica-polyethyleneimine Composites for Hexavalent Chromium Removal from Dilute Aqueous Solutions

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