One-pot synthesis of spherical nanoscale zero-valent iron/biochar composites for efficient removal of Pb(<scp>ii</scp>)

Shi, Yunlong; Yu, Changjiang; Liu, Mengying; Lin, Qiang; Lei, Ming; Wang, Darun; Yang, Mengwei; Yang, Yuting; Ma, Jian; Jia, Zhengya

doi:10.1039/d1ra07373g

Cited by 9 publications

(4 citation statements)

References 59 publications

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“…However, the theoretical adsorption capacity (128.7 mg g −1 ) estimated from the pseudo-second-order equation was slightly higher compared to the experimental results (116.5 mg g −1 ). In addition, the theoretical adsorption capacity (111.9 mg g −1 ) obtained from the pseudo-first-order kinetic model was more consistent with the experimental results, suggesting that the rate-limiting step was governed via diffusion while the ions were mainly retained on the surface via chemical forces [35,36].…”

Section: Adsorption Kineticssupporting

confidence: 71%

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Cobalt/Iron Bimetallic Biochar Composites for Lead(II) Adsorption: Mechanism and Remediation Performance

Zhao,

Qin,

Liu

et al. 2024

Molecules

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The performance of nano-zero-valent iron for heavy metal remediation can be enhanced via incorporation into bimetallic carbon composites. However, few economical and green approaches are available for preparing bimetallic composite materials. In this study, novel Co/Fe bimetallic biochar composites (BC@Co/Fe-X, where X = 5 or 10 represents the CoCl2 concentration of 0.05 or 0.1 mol L−1) were prepared for the adsorption of Pb2+. The effect of the concentration of cross-linked metal ions on Pb2+ adsorption was investigated, with the composite prepared using 0.05 mol L−1 Co2+ (BC@Co/Fe-5) exhibiting the highest adsorption performance. Various factors, including the adsorption period, Pb2+ concentration, and pH, affected the adsorption of Pb2+ by BC@Co/Fe-5. Further characterisation of BC@Co/Fe-5 before and after Pb2+ adsorption using methods such as X-ray diffraction and X-ray photoelectron spectroscopy suggested that the Pb2+ adsorption mechanism involved (i) Pb2+ reduction to Pb0 by Co/Fe, (ii) Co/Fe corrosion to generate Fe2+ and fix Pb2+ in the form of PbO, and (iii) Pb2+ adsorption by Co/Fe biochar. Notably, BC@Co/Fe-5 exhibited excellent remediation performance in simulated Pb2+-contaminated water and soil with good recyclability.

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Section: Adsorption Kineticssupporting

confidence: 71%

“…After pyrolysis at 900 • C for 3 h, the furnace was cooled to room temperature at a cooling rate of 10 • C min −1 . The prepared Co/Fe biochar composites (BC@Co/Fe-X, where X = 5 or 10 represents the CoCl 2 concentration of 0.05 or 0.1 mol L −1 ) were stored under vacuum [36].…”

Section: Preparation Of Bc@co/fe-xmentioning

confidence: 99%

Cobalt/Iron Bimetallic Biochar Composites for Lead(II) Adsorption: Mechanism and Remediation Performance

Zhao,

Qin,

Liu

et al. 2024

Molecules

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“…The characteristic diffraction peaks attributed to Fe 0 ( α -Fe 0 (110) crystal plane and α -Fe 0 (211) crystal plane) at 2 θ = 44.6 ° and 82.3° were observed for both SN and NZVI, indicating that Fe 0 was still present in the degradation products [34]. The diffraction peaks at 2 θ = 26.9 ° and 35.7° for SN and NZVI were attributed to Pb(OH) 2 and Pb 0 , respectively [35, 36]. In addition, a new characteristic peak corresponding to the (202) crystal plane of PbO∙xH 2 O appeared at 2 θ = 29.3 ° for SA [36].…”

Section: Resultsmentioning

confidence: 99%

“…The diffraction peaks at 2 θ = 26.9 ° and 35.7° for SN and NZVI were attributed to Pb(OH) 2 and Pb 0 , respectively [35, 36]. In addition, a new characteristic peak corresponding to the (202) crystal plane of PbO∙xH 2 O appeared at 2 θ = 29.3 ° for SA [36]. Absorption bands associated with antisymmetric, symmetric stretching vibrations of carboxyl functional groups were present in the range of 1400-1650 cm -1 for SN and SA and shifted from 1626 cm -1 , 1415 cm -1 to 1583 cm -1 , 1412 cm -1 for SN and from 1619 cm -1 , 1423 cm -1 to 1579 cm -1 , 1419 cm -1 for SA compared to preadsorption.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Zero-Valent Iron Dispersed by Sodium Alginate Enables Highly Efficient Removal of Lead (Pb) from Aqueous Solution

Zheng

Ren

et al. 2023

Adsorption Science & Technology

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Nanozero-valent iron (NZVI) shows great potential in the remediation of water pollution, but its application is limited by its instability and tendency to aggregate. To enhance the dispersibility and antioxidant properties of NZVI, we prepared composites (SN) by wrapping NZVI with sodium alginate (SA) for the removal of Pb(II) from water. Various characterization methods such as SEM-EDS, BET, XPS, and FT-IR were used to study the structure of the materials, and the adsorption properties of Pb(II) in the materials were analyzed using adsorption kinetics and adsorption isotherm experiments. The results showed that SN had a specific surface area of 47.05 m2/g, which was significantly higher than the 7.56 m2/g of NZVI, and the surface passivation was reduced. The maximum adsorption amount of SN on Pb(II) was obtained by fitting the adsorption isotherm model at 70.92 mg/g. After five cycles of adsorption, SN exhibited a removal rate of 95.11% for Pb(II). The mechanism of Pb(II) removal by SN involved the synergistic effect of electrostatic adsorption, redox reaction, ion exchange, and coprecipitation. Notably, even after 90 days of aging, the removal rate of Pb(II) by SN remained high at 95.39%, demonstrating good reactivity. These results indicated that SN is an effective adsorbent to remove Pb(II) contamination.

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Characterization of ibuprofen removal by calcined spherical hydrochar through adsorption experiments, molecular modeling, and artificial neural network predictions

Yoo

Lee²,

Jang³

et al. 2023

Chemosphere

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One-pot synthesis of spherical nanoscale zero-valent iron/biochar composites for efficient removal of Pb(ii)

Abstract: In this study, a spherical Fe/C composite (AIBC) was successfully prepared via carbonization of Fe3+-crosslinked sodium alginate.

Cited by 9 publications

References 59 publications

Cobalt/Iron Bimetallic Biochar Composites for Lead(II) Adsorption: Mechanism and Remediation Performance

Cobalt/Iron Bimetallic Biochar Composites for Lead(II) Adsorption: Mechanism and Remediation Performance

Nanoscale Zero-Valent Iron Dispersed by Sodium Alginate Enables Highly Efficient Removal of Lead (Pb) from Aqueous Solution

Characterization of ibuprofen removal by calcined spherical hydrochar through adsorption experiments, molecular modeling, and artificial neural network predictions

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