Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 407, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124396
Keywords
Smectite; Nano zero-valent iron; Arsenate removal; Mechanism of sorption
Categories
Funding
- UNIPRS Central Scholarship, The University of Newcastle, Australia
- UNRS Central Scholarship, The University of Newcastle, Australia
- Research Training Program (RTP) fund, The University of Newcastle
- Cooperative Research Centre for Contamination Assessment and Remediation of the Environment (CRC CARE), Australia
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Long-term exposure to inorganic arsenic in drinking water poses significant health risks, making arsenic removal crucial. A study developed an Australian smectite-supported nano zero-valent iron composite for arsenic sorption, demonstrating high efficiency and environmental friendliness in removing arsenic contaminants from water.
Prolonged exposure to inorganic arsenic (As) via drinking water is a major concern as it poses significant human health risks. Removal of As is crucial but requires effective and environment-friendly clean-up technology to avoid any additional risk to the environment. In this study, we developed Australian smectite (smec)-supported nano zero-valent iron (nZVI) composite for arsenate i.e., As(V) sorption. We used a range of tools, including X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and energy dispersion X-ray (EDS) spectroscopy to characterise the material. SEM and TEM images and elemental mapping of the composite reflect that the smectite layer was surrounded by a chain of iron nanobeads evenly distributed on clay particles, which is quite exceptional among currently available nZVIs. The maximum As(V) sorption capacity of this composite was 23.12 mg/g in the ambient conditions. Using X-ray photoelectron spectroscopy we unveiled chemical states of As and Fe before and after the sorption process. Additionally, the release of iron nanoparticles from the composite at various pHs (3-10) were found negligible, which demonstrates the effectiveness of smec-nZVI to remove As(V) from contaminated water without posing any secondary pollutant.
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