- Title
- Smectite-supported chain of iron nanoparticle beads for efficient clean-up of arsenate contaminated water
- Creator
- Uz-Zaman, Kh Ashraf; Biswas, Bhabananda; Rahman, Mohammad Mahmudur; Naidu, Ravi
- Relation
- Journal of Hazardous Materials Vol. 407, no. 124396
- Publisher Link
- http://dx.doi.org/10.1016/j.jhazmat.2020.124396
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2021
- Description
- 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.
- Subject
- smectite; nano zero-valent iron; arsenate removal; mechanism of sorption; SDG 3; SDG 6; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1475067
- Identifier
- uon:49448
- Identifier
- ISSN:0304-3894
- Language
- eng
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