Novel mesoporous FeAl bimetal oxides for As(III) removal: Performance and mechanism

Ding, Zecong; Fu, Fenglian; Cheng, Zihang; Lu, Jiangbo; Tang, Bing

doi:10.1016/j.chemosphere.2016.11.057

Cited by 16 publications

(5 citation statements)

References 36 publications

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“…Notably, only one peak could be assigned to each spectrum after As(V) or As(III) sorption, suggesting that their oxidation states did not change during the sorption process. Although there was no report in literature on the binding energy of arsenic adsorbed onto La-based materials, the binding energy of As(V) is usually 0.7–1.3 eV higher than that of As(III); − thus, the binding energies at 44.4 and 43.7 eV could be assigned to As(V) and As(III), respectively. This result suggested oxidation states of As(V) and As(III) on the ceramic surface did not change during the sorption process.…”

Section: Resultsmentioning

confidence: 99%

“…This result suggested oxidation states of As(V) and As(III) on the ceramic surface did not change during the sorption process. The observed binding energies for both As(V) and As(III) were lower than those adsorbed onto other metal oxides, 53,56 indicating the strong interaction between arsenic and the La surface that might alter the coordination environments of As(V) and As(III). Additionally, the As 3d spectrum of pure LaAsO 4 was also obtained as a reference, and the As(V) binding energy was in close agreement to the As(V)-loaded Lacoated ceramic material (Figure 4c).…”

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confidence: 91%

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Lanthanum(III)-Coated Ceramics as a Promising Material in Point-of-Use Water Treatment for Arsenite and Arsenate Removal

Yang

Min

et al. 2019

ACS Sustainable Chem. Eng.

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Low-cost and efficient As(V) (arsenate) and As(III) (arsenite) sorbents for point-of-use (POU) water filtration are needed for areas suffering from high arsenic contamination in their drinking water sources. In this study, lanthanum (La)-coated ceramic materials were used to produce both granules and disk filters for the removal of As(V) and As(III). Results from filtration experiments showed that the La-coated granules and disk filters could effectively treat ∼11200 and ∼14500 pore volumes (PVs) of As(V) contaminated solutions, as well as ∼6400 and ∼3200 PVs of As(III) contaminated solutions to meet the drinking water standard (<0.010 mg/L), respectively. Batch experiments were further conducted to elucidate the sorption behaviors of As(V) and As(III), and the sorption capacities reached 24.8 and 10.9 mg/g for As(V) and As(III), respectively. Characterization of La-coated ceramic material before and after As sorption suggested that the removal of As(V) may be primarily attributed to the formation of surface LaAsO4 precipitates, while formation of inner-sphere complexes with La on the ceramic surface contributed to As(III) removal. La-coated ceramic material could be used as a promising low-cost and efficient arsenic removal medium for POU household water treatment.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 91%

Lanthanum(III)-Coated Ceramics as a Promising Material in Point-of-Use Water Treatment for Arsenite and Arsenate Removal

Yang

Min

et al. 2019

ACS Sustainable Chem. Eng.

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“…Arsenic pollution is a great concern because of its toxicity and carcinogenicity with respect to human health (Ding, Fu, Cheng, Lu, & Bing, ). It is a common groundwater contaminant and mainly occurs in inorganic forms, such as arsenate (As(V)) and arsenite (As(III)) species (Wan et al., ).…”

Section: Introductionmentioning

confidence: 99%

Arsenite removal from groundwater by iron–manganese oxides filter media: Behavior and mechanism

Cheng

Zhang

2019

Water Environment Research

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Arsenic, a common contaminant in groundwater environments, usually coexists with other contaminants, for example, ammonium, iron, and manganese. In our previous studies, an iron-manganese (Fe-Mn) oxides filter media was developed for catalytic oxidation removal of ammonium, iron, and manganese. In this study, batch oxidation/ adsorption kinetic experiments revealed that the filter media could easily oxidize arsenite (As(III)) to arsenate (As(V)). And the sorption kinetics was found to follow the pseudo-second-order kinetic model. X-ray powder diffraction (XRD) and Fourier transform infrared spectra (FTIR) along with X-ray photoelectron spectroscopy (XPS) were used to analyze the surface change in the Fe-Mn oxides. Based on sorption and spectroscopic measurements, the mechanism of As(III) removal by the Fe-Mn oxides filter media was found to be an oxidation coupled with sorption approach. As(III) in the aqueous solution was firstly oxidized to As(V) on the surfaces of the Fe-Mn oxides filter media. Then the converted As(V) was attracted to the Fe-Mn oxides filter media surfaces and bounded with the active sites (−OH groups), through weak intermolecular H-bondings. Our results indicated that the novel Fe-Mn oxides filter media could be applied for the simultaneous removal of ammonium, iron, manganese, and As(III) in drinking water treatment and environmental remediation. • Practitioner points• A novel iron-manganese oxides filter for efficient As(III) removal was established. • The exhausted filter media could be easily regenerated by NaHCO 3 solution.• Mn(III) related to surface lattice oxygen species was responsible for As(III) oxidation. • The oxidation and adsorption processes were involved in As(III) removal. • The filter media could be successfully applied to simultaneous removal of ammonium, manganese, iron, and arsenic.

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“…Arsenic removal by adsorbents largely depends on solution pH, increasing the difficulty of wastewater disposal considering the wide pH range of contaminated water. However, it is relatively difficult to remove arsenite (As(III)), which can remain in the form of H 3 AsO 3 when the pH is lower than 9.2 [ 16 , 17 ]. Previous research indicated that uncharged H 3 AsO 3 is more difficult to remove using traditional physical-chemical treatment methods [ 18 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics, Kinetics, and Mechanisms of the Co-Removal of Arsenate and Arsenite by Sepiolite-Supported Nanoscale Zero-Valent Iron in Aqueous Solution

Ainiwaer

Zeng

Yin

et al. 2022

IJERPH

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In this study, a newly synthesized sepiolite-supported nanoscale zero-valent iron (S-nZVI) adsorbent was tested for the efficient removal of As(III) and As(V) in aqueous solution. Compared with ZVI nanoparticles, the As(III) and As(V) adsorption abilities of S-nZVI were substantially enhanced to 165.86 mg/g and 95.76 mg/g, respectively, owing to the good dispersion of nZVI on sepiolite. The results showed that the adsorption kinetics were well fitted with the pseudo-second-order model, and the adsorption isotherms were fitted with the Freundlich model, denoting a multilayer chemical adsorption process. The increase in the initial solution pH of the solution inhibited As(III) and As(V) adsorption, but a weaker influence on As(III) than As(V) adsorption was observed with increasing pH. Additionally, the presence of SO42− and NO3− ions had no pronounced effect on As(III) and As(V) removal, while PO43− and humic acid (HA) significantly restrained the As(III) and As(V) adsorption ability, and Mg2+/Ca2+ promoted the As(V) adsorption efficiency. Spectral analysis showed that As(III) and As(V) formed inner-sphere complexes on S-nZVI. As(III) oxidation and As(V) reduction occurred with the adsorption process on S-nZVI. Overall, the study demonstrated a potential adsorbent, S-nZVI, for the efficient removal of As(III) and As(V) from contaminated water.

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Novel mesoporous FeAl bimetal oxides for As(III) removal: Performance and mechanism

Cited by 16 publications

References 36 publications

Lanthanum(III)-Coated Ceramics as a Promising Material in Point-of-Use Water Treatment for Arsenite and Arsenate Removal

Lanthanum(III)-Coated Ceramics as a Promising Material in Point-of-Use Water Treatment for Arsenite and Arsenate Removal

Arsenite removal from groundwater by iron–manganese oxides filter media: Behavior and mechanism

Thermodynamics, Kinetics, and Mechanisms of the Co-Removal of Arsenate and Arsenite by Sepiolite-Supported Nanoscale Zero-Valent Iron in Aqueous Solution

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