Arsenic removal and fixation by iron (oxyhydr)oxides: What is new?

Souza, Taiane G.F.; Ciminelli, V.S.T.

doi:10.1016/j.coesh.2023.100466

Cited by 5 publications

(2 citation statements)

References 54 publications

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“…That is, it is difficult to remove the adsorbates from the source of contamination, so accompanying processes such as sedimentation or filtration are required. In these materials for As elimination, iron oxides composed of high amorphous hydrous ferric oxide (Fe(O)-OH) are commonly used as As adsorbent (Shafiquzzaman et al, 2023), goethite (α-FeOOH) (Souza & Ciminelli, 2023), maghemite (γ-Fe 2 O 3 ) (S. Ranjan et al, 2022), and hematite (α-Fe 2 O 3 ) (Zhao et al, 2021). Another example of the disadvantage of the powdery form is amorphous ferric oxide, which, despite having high surface areas when used as granular adsorbents in aqueous solutions, tends to aggregate into nano-sized powders.…”

Section: Introductionmentioning

confidence: 99%

Arsenic removal adsorbent using limonite–polyethersulfone composite fiber via continuous flow column process

Le Thi,

Zhe,

Kobayashi

2024

Water Environment Research

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This research introduces an enhanced limonite‐based composite fiber adsorbent for arsenic (As) removal. The modification involves creating polyethersulfone (PES)–limonite composite fibers loaded with 60 wt% limonite powders, designed to be applicable in water flow environments. The fibers were prepared using a wet‐spinning process based on phase inversion, with varying concentrations (10, 20, and 30 wt%) of PES in NMP solution. The composite fiber with 10 wt% NMP exhibited a porous structure and demonstrated efficient absorption of both As(III) and As(V). Adsorption followed the Langmuir model, with qm values of 1.5 mg/g for As(III) and 3.2 mg/g for As(V) at pH 6. In column experiments, As removal rates increased with contact time, attributed to decreased flow rates (1 mL/min). Moreover, increasing fiber column height led to enhanced removal rates, as indicated by the Adams–Bohart model. The mechanism for As(V) removal involved the formation of an inner‐sphere complex through ion exchange between α‐FeOOH and HAsO4− and H2AsO42− in an aqueous solution at pH 6.8.Practitioner Points Changing the polyethersulfone ratio in the composite leads to variations in the appearance of limonite within each composite fiber. Limonite composite fibers effectively remove As(III) and As(V) at neutral pH. The adsorption behavior follows Langmuir kinetic model, the qm of 1.5 mg/g for As(III) and 3.2 mg/g for As(V). Longer columns and contact times enhance arsenic (As) removal in practical water treatment systems. Adam–Bohart model aids in predicting breakthrough and saturation time in As adsorption column design.

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Section: Introductionmentioning

confidence: 99%

Arsenic removal adsorbent using limonite–polyethersulfone composite fiber via continuous flow column process

Le Thi,

Zhe,

Kobayashi

2024

Water Environment Research

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“…Arsenic (As) has become a worldwide concern because it is a carcinogenic trace metal [ 1 , 2 ]. Long-term exposure to As-containing substances is strongly linked to many types of cancer, such as skin, bladder, lung and respiratory tract cancers, and extensive liver damage [ 3 , 4 ]. Many developing countries and poor areas have been overexposed to As, with high As concentrations in their water supplies due to low management ability and public awareness, and inadequate water treatment [ 5 , 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Effective Technique and Mechanism for Simultaneous Adsorption of As(III/V) from Wastewater by Fe-ZIF-8@MXene

Zang,

Zhang,

et al. 2024

Toxics

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Arsenic (As) contamination of surface water has become a global concern, especially for the third world countries, and it is imperative to develop advanced materials and an effective treatment method to address the issue. In this paper, iron doped ZIF-8@MXene (Fe-ZIF-8@MXene) was prepared as a potential adsorbent to effectively and simultaneously remove As(III/V) from wastewater. To investigate this, Fe-ZIF-8@MXene was characterized before and after the removal of mixed As(III/V). The results of Fourier transform infrared (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), specific surface area (BET) and point of zero charge (pHpzc) showed that Fe-ZIF-8@MXene was prepared successfully and kept a stable structure after As(III) and As(V) adsorption. The particle size of Fe-ZIF-8@MXene was in the range of 0.5 μm to 2.5 μm, where its BET was 531.7 m2/g. For both contaminants, adsorption was found to follow pseudo-second-order kinetics and was best-fitted by the Langmuir adsorption model with correlation coefficients (R2) of 0.998 and 0.997, for As(III) and As(V), respectively. The adsorbent was then applied to remove As from two actual water samples, giving maximum removal rates of 91.07% and 98.96% for As(III) and As(V), respectively. Finally, removal mechanisms for As(III/V) by Fe-ZIF-8@MXene were also explored. During the adsorption, multiple complexes were formed under the effect of its abundant surface functional groups involving multiple mechanisms, which included Van der Waals force, surface adsorption, chemical complexation and electrostatic interactions. In conclusion, this study demonstrated that Fe-ZIF-8@MXene was an advanced and reusable material for simultaneous removal of As(III/V) in wastewater.

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Extracellular polymeric substances altered ferrihydrite (trans)formation and induced arsenic mobilization

Gao,

Wang,

Zhou

et al. 2024

Journal of Hazardous Materials

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Arsenic removal and fixation by iron (oxyhydr)oxides: What is new?

Cited by 5 publications

References 54 publications

Arsenic removal adsorbent using limonite–polyethersulfone composite fiber via continuous flow column process

Arsenic removal adsorbent using limonite–polyethersulfone composite fiber via continuous flow column process

Effective Technique and Mechanism for Simultaneous Adsorption of As(III/V) from Wastewater by Fe-ZIF-8@MXene

Extracellular polymeric substances altered ferrihydrite (trans)formation and induced arsenic mobilization

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