Separation and Purification Technology, Journal Year: 2023, Volume and Issue: 331, P. 125632 - 125632
Published: Nov. 7, 2023
Language: Английский
Journal of Hazardous Materials, Journal Year: 2025, Volume and Issue: 487, P. 137191 - 137191
Published: Jan. 11, 2025
Language: Английский
Citations
2
Environmental Science & Technology, Journal Year: 2023, Volume and Issue: 57(33), P. 12453 - 12464
Published: Aug. 10, 2023
Hematite is a common iron oxide in natural environments, which has been observed to influence the transport and fate of arsenate by its association with hematite. Although oxygen vacancies were demonstrated exist hematite, their contributions immobilization have not quantified. In this study, hematite samples tunable vacancy defect (OVD) concentrations synthesized treating defect-free using different NaBH4 solutions. The defects characterized positron annihilation lifetime spectroscopy, Doppler broadening radiation, extended X-ray absorption fine structure (EXAFS), thermogravimetric mass spectrometry (TG-MS), electron paramagnetic resonance (EPR), photoelectron spectroscopy (XPS). results revealed that was primary type existing on surface. TG-MS combined EPR analysis allowed quantification OVD Batch experiments OVDs had positive effect adsorption, could be quantitatively described linear relationship between concentration (Cdef, mmol m-2) enhanced adsorption amount caused (ΔQm, μmol (ΔQm = 20.94 Cdef, R2 0.9813). NH3-diffuse reflectance infrared Fourier transform (NH3-DRIFT) density functional theory (DFT) calculations beneficial improvement strength surface-active sites, thus considerably promoting arsenate.
Language: Английский
Citations
31
Environmental Research, Journal Year: 2024, Volume and Issue: 251, P. 118650 - 118650
Published: March 6, 2024
Language: Английский
Citations
12
Environmental Science & Technology, Journal Year: 2024, Volume and Issue: unknown
Published: Aug. 14, 2024
Ferrihydrite is omnipresent in nature, and its adsorption of As(III/V) decides the migration arsenic. Although As(III) commonly recognized as more mobile species inorganic arsenic, it sometimes exhibits less mobility ferrihydrite systems, which calls for further insights. In this study, we elucidated behavior mechanisms on under different loading levels (molar ratio As/Fe = 0–0.38), solution pH (3–10), coexisting ions [P(V) Ca(II)] based batch experiments, surface complexation modeling, density functional theory calculations, X-ray photoelectron spectroscopy. Our results show that weaker affinity but a larger capacity compared with As(V). On ferrihydrite, As(V) are adsorbed mainly bidentate mononuclear complexes at type-a sites [≡Fe(OH–0.5)2] binuclear type-b (2≡FeOH–0.5), respectively. As dosage increases, forms monodentate both sites, resulting higher site utilization efficiency, while does not due to repulsive electrostatic interaction. The difference also leads complex responses when high concentrations P(V) Ca(II). This study helps us understand environmental develop remediation strategy contaminated systems.
Language: Английский
Citations
12
Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 31, 2025
Defects are common features in hematite that arise from deviations the perfect mineral crystal structure. Vacancy defects have been shown to significantly enhance arsenate (As) immobilization by hematite. However, contributions vacancy on different exposed facets of not fully quantified. In this study, samples with various morphologies were pretreated sodium borohydride (NaBH4) generate oxygen (OVDs), analyzed quantitatively using extended X-ray absorption fine structure (EXAFS) and thermogravimetric analysis (TG). Batch experiments revealed OVDs showed significant variations improving adsorption, i.e., quantitative enhancement adsorption amount per unit OVD concentration (ΔQm/Cdefect) followed sequence (110) facet (80.05 μmol/mmoldef) > (001) (31.85 (012) (13.14 μmol/mmoldef). The underlying mechanism which affect across was studied. results reveal tremendous improvement caused compared attributed their stronger bonding strength As under-coordinated Fe atoms, thus promoting arsenate. findings study our ability precisely understand migration fate while also aiding design highly efficient iron materials for mitigating pollution.
Language: Английский
Citations
1
Environmental Pollution, Journal Year: 2024, Volume and Issue: 344, P. 123318 - 123318
Published: Jan. 11, 2024
Language: Английский
Citations
6
Journal of Hazardous Materials Advances, Journal Year: 2023, Volume and Issue: 13, P. 100398 - 100398
Published: Dec. 27, 2023
Arsenic is a metalloid with high risk of carcinogenesis. High levels arsenic in the water and soil environment can directly impact on humans ecosystems. Ferrihydrite plays an important role controlling mobility toxicity contaminated water. However, it to note that ferrihydrite unstable undergo transformation, dissolution, agglomeration. These processes significantly conversion fixation efficiency arsenic. This article discusses interaction mechanism remediation effect It also summarizes environmental behavior under external factors such as content, pH levels, temperature, presence Fe2+, types ions solution, organic matter, coexisting minerals. Furthermore, looks forward future research development directions, providing valuable reference for effective use remediating arsenic-contaminated environments.
Language: Английский
Citations
16
Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 473, P. 134434 - 134434
Published: May 10, 2024
Language: Английский
Citations
6
Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 466, P. 133640 - 133640
Published: Jan. 28, 2024
Language: Английский
Citations
5
Water Research, Journal Year: 2023, Volume and Issue: 242, P. 120180 - 120180
Published: June 8, 2023
Language: Английский
Citations
13