As(V) adsorption by a novel core-shell magnetic nanoparticles prepared with Iron-containing water treatment residuals

Zeng, Hong‐Yan; Zhai, Longxue; Zhang, Jie; Liu, Dong

doi:10.1016/j.scitotenv.2020.142002

Cited by 37 publications

(12 citation statements)

References 39 publications

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“…Indeed, many magnetic Fe-oxide NP composites have been tested as As adsorbents in recent years [ 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 ]. Their adsorbent properties and experimental conditions are exposed and a comparison of their removal efficiency and an analysis of the experimental condition effects (pH, temperature, adsorbent dose, initial concentration, particle size and shape, surface area, and saturation magnetization, equilibrium time, kinetic and isothermal adsorption parameters) [ 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 ,…”

Section: In-detail Discussion Of the Adsorbent Propertiesmentioning

confidence: 99%

“…Moreover, they also observed that the adsorption capacity increased due to the high driving force to transfer the mass of elevated concentrations of As(V) in the solution, as observed in the adsorption isotherms. Briefly, considering the As adsorption process, the adsorbents that exhibited the best performances and their maximum adsorption capacities in mg g −1 according to the Langmuir adsorption model, presented for both As species, and compared to other systems [ 58 , 59 , 60 , 61 , 62 , 63 , 65 , 66 , 68 , 69 , 70 , 71 , 72 , 73 , 74 , 75 , 76 , 77 , 78 , 79 , 80 , 81 , 82 , 83 , 84 , 85 , 86 , 87 , 88 , 89 , 90 , 91 , 92 , 93 , 94 , 95 , 96 , 97 , 98 , 99 ], were FeO X -GO-80 with 147 mg g −1 (arsenite) and 113 mg g −1 (arsenate) [ 64 ], γ-Fe 2 O 3 @CTF-1 with 198 mg g −1 (arsenite) and 102.3 mg g −1 (arsenate) [ …”

Section: In-detail Discussion Of the Adsorbent Propertiesmentioning

confidence: 99%

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Differentiating Nanomaghemite and Nanomagnetite and Discussing Their Importance in Arsenic and Lead Removal from Contaminated Effluents: A Critical Review

2021

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Arsenic and lead heavy metals are polluting agents still present in water bodies, including surface (lake, river) and underground waters; consequently, the development of new adsorbents is necessary to uptake these metals with high efficiency, quick and clean removal procedures. Magnetic nanoparticles, prepared with iron-oxides, are excellent candidates to achieve this goal due to their ecofriendly features, high catalytic response, specific surface area, and pulling magnetic response that favors an easy removal. In particular, nanomagnetite and maghemite are often found as the core and primary materials regarding magnetic nanoadsorbents. However, these phases show interesting distinct physical properties (especially in their surface magnetic properties) but are not often studied regarding correlations between the surface properties and adsorption applications, for instance. Thus, in this review, we summarize the main characteristics of the co-precipitation and thermal decomposition methods used to prepare the nano-iron-oxides, being the co-precipitation method most promising for scaling up processes. We specifically highlight the main differences between both nano-oxide species based on conventional techniques, such as X-ray diffraction, zero and in-field Mössbauer spectroscopy, X-ray photoelectron spectroscopy, X-ray absorption spectroscopy, and X-ray magnetic circular dichroism, the latter two techniques performed with synchrotron light. Therefore, we classify the most recent magnetic nanoadsorbents found in the literature for arsenic and lead removal, discussing in detail their advantages and limitations based on various physicochemical parameters, such as temperature, competitive and coexisting ion effects, i.e., considering the simultaneous adsorption removal (heavy metal–heavy metal competition and heavy metal–organic removal), initial concentration, magnetic adsorbent dose, adsorption mechanism based on pH and zeta potential, and real water adsorption experiments. We also discuss the regeneration/recycling properties, after-adsorption physicochemical properties, and the cost evaluation of these magnetic nanoadsorbents, which are important issues, but less discussed in the literature.

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Section: In-detail Discussion Of the Adsorbent Propertiesmentioning

confidence: 99%

Section: In-detail Discussion Of the Adsorbent Propertiesmentioning

confidence: 99%

Differentiating Nanomaghemite and Nanomagnetite and Discussing Their Importance in Arsenic and Lead Removal from Contaminated Effluents: A Critical Review

2021

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“…The adsorption e ciency increased from 90.5-94.5% when the adsorbent dosage was increased from 100 to 150 mg. The reason may be that the mass ratio of adsorbent to Cr( ) decreases with the increased dosage of adsorbent, which leads to the under-utilisation of Fe 3 O 4 @Si-OH@CS surface adsorption sites (Zeng et al, 2020). Based on our results, we inferred that a good adsorption e ciency can be achieved with 100 mg adsorbents.…”

Section: Effect Of Absorbent Dosagementioning

confidence: 70%

Chitosan-silanol groups functional magnetic nanoparticles for heavy metals and bacteria removal

Liu

Yong-hui²,

Liu³

et al. 2022

Preprint

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Studies have shown that there are multiple co-existence pollutants in environmental water over recent years. In this study, we report the design and synthesis of magnetic adsorbents incorporating chitosan-silanol groups (Fe3O4@Si-OH@CS) with improved physicochemical properties for the removal of various heavy metals and bacteria from polluted water. Fe3O4@Si-OH@CS was synthesised using the co-precipitation method. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR), Brunauer-Emmett-Teller (BET), Vibrating sample magnetometer (VSM), and Zeta techniques were used to characterise. The effects of factors such as pH, adsorption time, and adsorbent dosage were optimised. The results indicated that Fe3O4@Si-OH@CS had high adsorption efficiency and adsorption capacity for Cr (VI), As, Hg and Se. Moreover, Cr (VI) and As have a preferential adsorption effect when multiple metal ions coexist. The adsorption performance of Fe3O4@Si-OH@CS to bacteria was verified using E. coli (gram-negative) and S. aureus (gram-positive). The developed adsorbent also showed good adsorption efficiency for both gram-negative and gram-positive bacteria. Overall, the synthesised Fe3O4@Si-OH@CS adsorbent showed high removal efficiency and adsorption capacity with a stable structure and easy separation. It has promising applications for the removal of heavy metals and bacteria from water.

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“…However, the arsenic removal experiments were performed under extremely acidic pH. A work of Zeng et al [47] reported a Q max of 26.1 mg g −1 using maghemite (γ-Fe 2 O 3 ) for consecutive uses, under acidic pH values (pH = 4). A Fe-Y binary oxide was used to remove As(V) in water at acidic pH, achieving a Q max of 303 mg g −1 .…”

Section: Adsorption Mechanismmentioning

confidence: 99%

Reusable Nanocomposite Membranes for Highly Efficient Arsenite and Arsenate Dual Removal from Water

Salazar

Martins

Valverde

et al. 2021

Adv Materials Inter

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Nanocomposite membranes (NCMs) of poly(vinylidene fluoride‐hexafluoropropylene), PVDF‐HFP, with different yttrium carbonate and magnetite loadings, are prepared, and their dual adsorption capacity over neutral arsenite and anionic arsenate species is evaluated. The nanoparticles (NPs) and the corresponding NCMs are fully characterized in morphology, microstructure, thermal, and surface properties. The nanocomposite membranes present a micrometric porous structure with a homogeneous distribution of the active nanoparticles. Chemical, thermal, and water‐contact angle characteristics of the NCMs point out that they maintain the chemical and thermal stability of the polymer while improving the wettability. Arsenic removal depends on NP loading and pH of the media. For instance, efficiencies close to 100% are achieved for arsenate species under acidic conditions, while adsorption capacity over arsenite is also incremented above 80%. Fe3O4/PVDF‐HFP nanocomposite shows a dual affinity for the adsorption of As(III) and As(V) species, with the maximum adsorption capacities of 92.82 and 137.08 mg g−1, respectively. In addition, both NCMs are easily activated and reused without significant efficiency loss. Consequently, the nanocomposite membranes represent low‐cost, reusable, and efficient water remediation systems suitable for the long‐term removal of As(III) and As(V) under conditions mimicking real polluted surface and groundwater.

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As(V) adsorption by a novel core-shell magnetic nanoparticles prepared with Iron-containing water treatment residuals

Cited by 37 publications

References 39 publications

Differentiating Nanomaghemite and Nanomagnetite and Discussing Their Importance in Arsenic and Lead Removal from Contaminated Effluents: A Critical Review

Differentiating Nanomaghemite and Nanomagnetite and Discussing Their Importance in Arsenic and Lead Removal from Contaminated Effluents: A Critical Review

Chitosan-silanol groups functional magnetic nanoparticles for heavy metals and bacteria removal

Reusable Nanocomposite Membranes for Highly Efficient Arsenite and Arsenate Dual Removal from Water

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