Stability of hydrous ferric oxide nanoparticles encapsulated inside porous matrices: Effect of solution and matrix phase

Pan, Bingjun; Du, Cuiwei; Zhang, Huichun; Wu, Jianfei; He, Feng; Wang, Jiade; Chen, Jianmeng

doi:10.1016/j.cej.2018.04.130

Cited by 19 publications

(6 citation statements)

References 48 publications

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“…Additionally, the effect of temperature on Cr(VI) reduction was also investigated (Figure S5), and we found that the reduction percentage increased from 54.3% to 68.4% when increasing the temperature from 25 to 50 °C. Comparatively, the Cr(VI) removal capacities of other amine-based adsorbents were compiled and are listed in Table S3, which demonstrates that the developed EDA@CMPS obviously outperformed its counterparts; notably, a decent reduction ability of EDA@CMPS was still observed under neutral or even basic conditions because of the unique physicochemical properties inside its pore structure, that is, different H + activities due to the nanoconfinement effect …”

Section: Resultsmentioning

confidence: 99%

“…Comparatively, the Cr(VI) removal capacities of other amine-based adsorbents were compiled and are listed in Table S3, which demonstrates that the developed EDA@CMPS obviously outperformed its counterparts; notably, a decent reduction ability of EDA@ CMPS was still observed under neutral or even basic conditions because of the unique physicochemical properties inside its pore structure, that is, different H + activities due to the nanoconfinement effect. 30 Effect of Coexisting Anions and Cations. Ubiquitous ions in the water body usually pose a significant challenge to the removal performance of adsorbent materials.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Thus, anchoring the amine group onto a reliable support remains an effective strategy to realizing their advantages for practical application. On the other hand, porous polystyrene adsorbents themselves have been widely applied for field water treatment because of their stable chemical properties, perfect mechanical strength, and excellent hydraulic properties. − Furthermore, their surface chemical properties and pore structures are tunable and can be customized when given a specified target pollutant. , Thus, they frequently served as supporting matrixes (for loading with inorganic metal nanoparticles) , or starting materials (for grafting with specific functional groups) to tailor desirable adsorbents.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneously Sequestrating and Reducing Bichromate by the Built-in Ethylenediamine Group inside Polystyrene Adsorbent

Hong

Liu

et al. 2023

ACS EST Eng.

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Simultaneous sequestration and reduction of bichromate [Cr(VI)] poses an attractive and practical fashion for treating Cr(VI)-contaminated wastewater, for it not only immobilizes the pollutant but also reduces its toxicity. To this end, an EDA-functionalized adsorbent (EDA@CMPS) was developed with a simple one-step method by integrating ethylenediamine (EDA, a reversible redox unit) onto the skeleton of chloromethylated polystyrene adsorbent (CMPS), and it can sequestrate Cr(VI) and in situ reduce Cr(VI) to Cr(III), which was then immediately locked inside the adsorbent phase. Batch experiments confirmed that EDA@CMPS had a high removal capacity toward Cr(VI) (419 mg/g, at 25 °C), a large proportion of which was reduced to Cr(III) without leaking into the aqueous phase at pH ≥ 2. Ubiquitous anions (Cl–, NO3 –, SO4 2–, and H2PO4 –) and cations (Mg2+ and Ca2+) have a certain effect on the removal efficiencies, but EDA@CMPS still demonstrated satisfied Cr(VI) removal even with the competing ions at 100-times higher concentration. FT-IR and XPS analyses revealed that the amine group of EDA was responsible for sequestrating and reducing Cr(VI), where the amine group was oxidized into an imine group, which then played a key role in immobilizing the generated Cr(III) via chelation. Attractively, even under neutral conditions, EDA@CMPS also demonstrated decent removal and reduction performance toward Cr(VI). Furthermore, the yielded imine group can be perfectly restored to an amine group by simple alkali-acid treatment. Repeated removal–regeneration cycles verified the reusability of EDA@CMPS in treating Cr(VI) solution. Fixed-bed column experiments and treatment of a real electroplating wastewater further validated the potential of EDA@CMPS in treating Cr(VI) wastewater for practical application.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Simultaneously Sequestrating and Reducing Bichromate by the Built-in Ethylenediamine Group inside Polystyrene Adsorbent

Hong

Liu

et al. 2023

ACS EST Eng.

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“…17,18 To overcome these challenges, one of the most effective strategies is to encapsulate the iron (hydr)oxide NPs into substrates with uniform and regular channels or pores, such as carbon nanotubes, 19,20 homoporous membranes, 21 ordered mesoporous materials, 22 and macroporous ion exchange resins. 23 When the accommodation scale provided by these substrates falls in the nanosized range, a terminology "nanoconfinement" has been frequently used to describe the above strategy. 24,25 Nanoconfinement has been evidenced to cause fundamental changes in the properties of nanomaterials and the energy landscape of chemical reactions.…”

Section: ■ Introductionmentioning

confidence: 99%

Structure Evolution of Iron (Hydr)oxides under Nanoconfinement and Its Implication for Water Treatment

Wang,

Jiang,

Qian

et al. 2023

Environ. Sci. Technol.

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In the development of nanoenabled technologies for large-scale water treatment, immobilizing nanosized functional materials into the confined space of suitable substrates is one of the most effective strategies. However, the intrinsic effects of nanoconfinement on the decontamination performance of nanomaterials, particularly in terms of structural modulation, are rarely unveiled. Herein, we investigate the structure evolution and decontamination performance of iron (hydr)oxide nanoparticles, a widely used material for water treatment, when confined in track-etched (TE) membranes with channel sizes varying from 200 to 20 nm. Nanoconfinement drives phase transformation from ferrihydrite to goethite, rather than to hematite occurring in bulk systems, and the increase in the nanoconfinement degree from 200 to 20 nm leads to a significant drop in the fraction of the goethite phase within the aged products (from 41% to 0%). The nanoconfinement configuration is believed to greatly slow down the phase transformation kinetics, thereby preserving the specific adsorption of ferrihydrite toward As(V) even after 20-day aging at 343 K. This study unravels the structure evolution of confined iron hydroxide nanoparticles and provides new insights into the temporospatial effects of nanoconfinement on improving the water decontamination performance.

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“…For example, iron oxide was loaded on the biochar fiber to prepare a nanoneedle type of composite with high adsorption capacity for As(V) [ 11 ]. The hydrated ferric oxide nanoparticles encapsulated inside porous matrixes such as resins and granular activated carbon had a stronger binding ability with Cu(II) ions than the pure hydrated ferric oxides [ 12 ]. Among these templates, natural fibers could exhibit special properties due to their large surface areas and high surface-volume ratio.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired synthesis of fiber-shaped silk fibroin-ferric oxide nanohybrid for superior elimination of antimonite

Zeng

Tong

et al. 2021

Journal of Hazardous Materials

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Stability of hydrous ferric oxide nanoparticles encapsulated inside porous matrices: Effect of solution and matrix phase

Cited by 19 publications

References 48 publications

Simultaneously Sequestrating and Reducing Bichromate by the Built-in Ethylenediamine Group inside Polystyrene Adsorbent

Simultaneously Sequestrating and Reducing Bichromate by the Built-in Ethylenediamine Group inside Polystyrene Adsorbent

Structure Evolution of Iron (Hydr)oxides under Nanoconfinement and Its Implication for Water Treatment

Bioinspired synthesis of fiber-shaped silk fibroin-ferric oxide nanohybrid for superior elimination of antimonite

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