Multi-component removal of Pb(II), Cd(II), and As(V) over core-shell structured nanoscale zero-valent iron@mesoporous hydrated silica

Ma, Qian; Teng, Wei; Yu, Sun; Chen, Yanyan; Xue, Yonggang; Chen, Xiaoqian; Zhang, Chuning; Zhang, Hua; Fan, Jianwei; Qiu, Yuping; Fu, Rongbing

doi:10.1016/j.scitotenv.2022.154329

Cited by 35 publications

(6 citation statements)

References 70 publications

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“…The peak at nearly 101.56 eV is ascribed to the Si 2p which affirms the excellent support of NZVI on Si (Fig. 5f) 26 .…”

Section: Resultssupporting

confidence: 71%

“…Despite the aforementioned excellent characteristics of NZVI, it can easily aggregate because of its magnetic properties and van der Waals forces which adversely affect the reactivity and reducibility performance of NZVI 25 . Additionally, oxidation of NZVI can frequently take place leading to the formation of a corrosion layer on its surface obstructing the extended use of NZVI 26 .…”

mentioning

confidence: 99%

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The superior performance of silica gel supported nano zero-valent iron for simultaneous removal of Cr (VI)

Salama

Samy

Shokry

et al. 2022

Sci Rep

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Pure nano zero-valent iron (NZVI) was fabricated under optimum conditions based on material production yield and its efficiency toward acid blue dye-25 decolorization. The optimum prepared bare NZVI was immobilized with two different supports of silica and starch to fabricate their composites nanomaterials. The three different prepared zero-valent iron-based nanomaterials were evaluated for removal of hexavalent chromium (Cr(VI)). The silica-modified NZVI recorded the most outstanding removal efficiency for Cr(VI) compared to pristine NZVI and starch-modified NZVI. The removal efficiency of Cr(VI) was improved under acidic conditions and decreased with raising the initial concentration of Cr(VI). The co-existence of cations, anions, and humic acid reduced Cr(VI) removal efficiency. The removal efficiency was ameliorated from 96.8% to 100% after adding 0.75 mM of H2O2. The reusability of silica-modified NZVI for six cycles of Cr(VI) removal was investigated and the removal mechanism was suggested as the physicochemical process. Based on Langmuir isotherm, the maximal Cr(VI) removal capacity attained 149.25 mg/g. Kinetic and equilibrium data were efficiently fitted using the pseudo-second-order and Langmuir models, respectively confirming the proposed mechanism. Diffusion models affirmed that the adsorption rate was governed by intraparticle diffusion. Adsorption thermodynamic study suggested the spontaneity and exothermic nature of the adsorption process. This study sheds light on the technology that has potential for magnetic separation and long-term use for effective removal of emerging water pollutants.

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“…The peak at nearly 101.56 eV is ascribed to the Si 2p which affirms the excellent support of NZVI on Si (Fig. 5f) 26 .…”

Section: Resultssupporting

confidence: 71%

mentioning

confidence: 99%

The superior performance of silica gel supported nano zero-valent iron for simultaneous removal of Cr (VI)

Salama

Samy

Shokry

et al. 2022

Sci Rep

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“…Researchers have explored using metal oxide nanoparticles as efficient adsorbents for heavy metal removal [ 25 ]. Metal oxide nanoparticles have a high surface area and reactivity, which enhance their adsorption capacity and selectivity [ 26 , 27 , 28 ]. However, the sole usage of nanoparticles presents practical challenges, such as aggregation and instability [ 29 , 30 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Toxic Metals Using Hydrous Ferric Oxide Nanoparticles Embedded in Hybrid Ion-Exchange Resins

Sodzidzi,

Phiri,

Nure

et al. 2024

Materials

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Acid mine drainage (AMD) is a major environmental problem caused by the release of acidic, toxic, and sulfate-rich water from mining sites. This study aimed to develop novel adsorbents for the removal of chromium (Cr(VI)), cadmium (Cd(II)), and lead (Pb(II)) from simulated and actual AMD using hybrid ion-exchange resins embedded with hydrous ferric oxide (HFO). Two types of resins were synthesized: anionic exchange resin (HAIX-HFO) for Cr(VI) removal and cationic exchange resin (HCIX-HFO) for Cd(II) and Pb(II) removal. The resins were characterized using scanning electron microscopy and Raman spectroscopy, which confirmed the presence of HFO particles. Batch adsorption experiments were conducted under acidic and sulfate-enhanced conditions to evaluate the adsorption capacity and kinetics of the resins. It was found that both resins exhibited high adsorption efficiencies and fast adsorption rates for their respective metal ions. To explore the potential adsorption on actual AMD, HCIX-HFO demonstrated significant removal of some metal ions. The saturated HCIX-HFO resin was regenerated using NaCl, and a high amount of the adsorbed Cd(II) and Pb(II) was recovered. This study demonstrates that HFO-embedded hybrid ion-exchange resins are promising adsorbents for treating AMD contaminated with heavy metals.

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“…[2] Among them, adsorption is one of the most widely used methods because of its conferred economic value and high efficiency. In recent years, abundant adsorbents have been developed for the Cd 2 + removal, such as crystalline silicates, [3] zeolites, [4] MOFs, [5] carbons, [6] clay minerals, [7] etc. due to their porous structure, huge specific surface area and exposed adsorption sites.…”

Section: Introductionmentioning

confidence: 99%

Insight into the Mechanism of Cd²⁺ Removal by MgAl Layered Double Hydroxides with Different Host‐Guest Interactions

Bai

et al. 2023

Chemistry A European J

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Layered double hydroxides (LDHs) have shown great potential as adsorbents for the removal of heavy metals. Nevertheless, how the host‐guest interactions of LDHs affect the removal mechanism remains to be less explored. Herein, CO32−/NO3−/SO42−/Cl− intercalated MgAl‐LDHs with different host‐guest interactions were fabricated and their removal mechanism for Cd2+ was investigated. The removal capacity increased in the order of MgAl−CO3 (127.3 mg/g)

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Multi-component removal of Pb(II), Cd(II), and As(V) over core-shell structured nanoscale zero-valent iron@mesoporous hydrated silica

Cited by 35 publications

References 70 publications

The superior performance of silica gel supported nano zero-valent iron for simultaneous removal of Cr (VI)

The superior performance of silica gel supported nano zero-valent iron for simultaneous removal of Cr (VI)

Adsorption of Toxic Metals Using Hydrous Ferric Oxide Nanoparticles Embedded in Hybrid Ion-Exchange Resins

Insight into the Mechanism of Cd²⁺ Removal by MgAl Layered Double Hydroxides with Different Host‐Guest Interactions

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Multi-component removal of Pb(II), Cd(II), and As(V) over core-shell structured nanoscale zero-valent iron@mesoporous hydrated silica

Cited by 35 publications

References 70 publications

The superior performance of silica gel supported nano zero-valent iron for simultaneous removal of Cr (VI)

The superior performance of silica gel supported nano zero-valent iron for simultaneous removal of Cr (VI)

Adsorption of Toxic Metals Using Hydrous Ferric Oxide Nanoparticles Embedded in Hybrid Ion-Exchange Resins

Insight into the Mechanism of Cd2+ Removal by MgAl Layered Double Hydroxides with Different Host‐Guest Interactions

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Insight into the Mechanism of Cd²⁺ Removal by MgAl Layered Double Hydroxides with Different Host‐Guest Interactions