Removal and reduction of Cr(Ⅵ) in simulated wastewater using magnetic biochar prepared by co-pyrolysis of nano-zero-valent iron and sewage sludge

Liu, Liheng; Liu, Xiu; Wang, Dunqiu; Lin, Hua; Huang, Lin

doi:10.1016/j.jclepro.2020.120562

Cited by 167 publications

(50 citation statements)

References 61 publications

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“…Pseudo-first order model and pseudo-second-order model were initially applied to simulate the kinetic data ( Table 2 ). The adsorption processes of both adsorbents under all initial Cr(VI) concentrations were better fitted to the pseudo-second-order model ( R 2 > 0.92), which supported the premise that adsorption process was dominated by the chemisorption [ 2 , 14 ]. The theoretical equilibrium adsorption amount of Cr(VI) obtained by fitting the pseudo-second-order kinetic equation was consistent with the experimentally measured equilibrium adsorption amount.…”

Section: Resultssupporting

confidence: 65%

“…The magnetic separation has been proven as a selective and efficient approach of solid-liquid separation, compared with traditional methods of centrifugation, filtration, and sedimentation [ 13 ]. Following this concept, introducing the magnetic medium (e.g., zero-valent iron (ZVI), and magnetite (Fe 3 O 4 )) to the biochar through chemical co-precipitation has been developed to enable the magnetic biochar to be effectively separated from the solution via magnetic separating techniques [ 14 ]. More importantly, previous studies have demonstrated that the modified magnetic biochar could also significantly improve the adsorption rate of Cr(VI) from 26.3% to 83.5% because of the increased adsorption sites of the adsorbent [ 13 , 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

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Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

et al. 2020

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This study developed a nano-magnetite-modified biochar material (m-biochar) using a simple and rapid in situ synthesis method via microwave treatment, and systematically investigated the removal capability and mechanism of chromium (VI) by this m-biochar from contaminated groundwater. The m-biochar was fabricated from reed residues and magnetically modified by nano-Fe3O4. The results from scanning electron microscopy (SEM) and X-ray diffraction (XRD) characterisations confirmed the successful doping of nano-Fe3O4 on the biochar with an improved porous structure. The synthesised m-biochar exhibited significantly higher maximum adsorption capacity of 9.92 mg/g compared with that (8.03 mg/g) of the pristine biochar. The adsorption kinetics followed the pseudo-second-order model and the intraparticle diffusion model, which indicated that the overall adsorption rate of Cr(VI) was governed by the processes of chemical adsorption, liquid film diffusion and intramolecular diffusion. The increasing of the pH from 3 to 11 significantly affected the Cr(VI) adsorption, where the capabilities decreased from 9.92 mg/g to 0.435 mg/g and 8.03 mg/g to 0.095 mg/g for the m-biochar and pristine biochar, respectively. Moreover, the adsorption mechanisms of Cr(VI) by m-biochar were evaluated and confirmed to include the pathways of electrostatic adsorption, reduction and complexation. This study highlighted an effective synthesis method to prepare a superior Cr(VI) adsorbent, which could contribute to the effective remediation of heavy metal contaminations in the groundwater.

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Section: Resultssupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

et al. 2020

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“…It was reported in related studies that NZVI-modified BC nanocomposite is a propitious candidate for the adsorptive removal of miscellaneous contaminants such as organic dye [35,36], nitroaromatic compound [37], and heavy metals [38]. Essentially, this combination has a dual benefit since BC enhances the dispersion of the magnetic NZVI particles and inhibits their aggregation [39]. Thence, BC endows NZVI more stability in air with low aggregation, retaining its good adsorption and reduction properties [40].…”

Section: Introductionmentioning

confidence: 99%

Zero-valent iron supported-lemon derived biochar for ultra-fast adsorption of methylene blue

El-Monaem

Omer

Eldin

et al. 2022

Biomass Conv. Bioref.

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Green-based materials represent a new promising class of ecofriendly and economic adsorbents. Herein, nano zero-valent iron supported-lemon derived biochar (NZVI-LBC) was prepared for the first time and examined in the adsorptive removal of methylene blue as a model pollutant. Different characterization tools were used to ensure the successful fabrication of the NZVI-LBC composite including FTIR, XRD, TEM, XPS, VSM, BET, and zeta potential analysis. It was found that the fabricated NZVI–supported biochar composite attained the propitious adsorbent criteria since it provided a supreme efficient adsorption process at short time. The reckoned maximum adsorption capacity of MB onto NZVI-LBC reached 1959.94 mg/g within merely 5 min. The obtained data clarified that the adsorption process of MB onto NZVI-LBC fitted pseudo 2nd order kinetic model and Freundlich isotherm model. Besides, the adsorption process of MB onto NZVI-LBC was found to be endothermic in nature. In addition, NZVI-LBC composite revealed an excellent adsorption behavior even after seven cycles. The concrete results reflect the potentiality of NZVI-LBC composite to be a superb candidate to remove cationic pollutants from their aqueous solutions. Graphical abstract

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“… 1 For example, chromium pollution mainly comes from industries such as paper, leather tanning, electroplating, metal processing, film processing, mining of chromium ores and manufacturing of dyes. 2 Chromium exists mainly in two forms: hexavalent chromium Cr( vi ) and trivalent chromium Cr( iii ). Cr( vi ) is much more mobile, soluble and poisonous than Cr( iii ).…”

Section: Introductionmentioning

confidence: 99%

Highly dispersed and stable nano zero-valent iron doped electrospun carbon nanofiber composite for aqueous hexavalent chromium removal

et al. 2022

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Removal and reduction of Cr(Ⅵ) in simulated wastewater using magnetic biochar prepared by co-pyrolysis of nano-zero-valent iron and sewage sludge

Cited by 167 publications

References 61 publications

Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

Sustainable Chromium (VI) Removal from Contaminated Groundwater Using Nano-Magnetite-Modified Biochar via Rapid Microwave Synthesis

Zero-valent iron supported-lemon derived biochar for ultra-fast adsorption of methylene blue

Highly dispersed and stable nano zero-valent iron doped electrospun carbon nanofiber composite for aqueous hexavalent chromium removal

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