- Title
- Efficient and selective removal of SeVI and AsV mixed contaminants from aqueous media by montmorillonite-nanoscale zero valent iron nanocomposite
- Creator
- Suazo-Hernández, Jonathan; Manquián-Cerda, Karen; de la Luz Mora, María; Molina-Roco, Mauricio; Angélica Rubio, María; Sarkar, Binoy; Bolan, Nanthi; Arancibia-Miranda, Nicolás
- Relation
- Journal of Hazardous Materials Vol. 403, Issue 5 February 2021, no. 123639
- Publisher Link
- http://dx.doi.org/10.1016/j.jhazmat.2020.123639
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2021
- Description
- Nanoscale zero-valent iron (NZVI) and NZVI supported onto montmorillonite (NZVI-Mt) were synthetized and used in this study to remove SeVI and AsV from water in mono- and binary-adsorbate systems. The adsorption kinetics and isotherm data for SeVI and AsV were adequately described by the pseudo-second-order (PSO) (r2>0.94) and Freundlich (r2>0.93) equations. Results from scanning electron microscopy showed that the dimension of the NZVI immobilized on the Mt was smaller than pure NZVI. Using 0.05 g of adsorbent and an initial 200 mg L−1 AsV and SeVI concentration, the maximum adsorption capacity (qmax and partition coefficient (PC) for AsV on NZVI-Mt in monocomponent system were 54.75 mg g-1 and 0.065 mg g-1·μM-1, which dropped respectively to 49.91 mg g-1 and 0.055 mg g-1·μM-1 under competitive system. For SeVI adsorption on NZVI-Mt in monocomponent system, qmax and PC were 28.63 mg g-1 and 0.024 mg g-1·μM-1, respectively. Values of qmax and PC were higher for NZVI-Mt than NZVI and montmorillonite, indicating that the nanocomposite contained greater adsorption sites for removing both oxyanions, but with a marked preference for AsV. Future research should evaluate the effect of different operational variables on the removal efficiency of both oxyanions by NZVI-Mt.
- Subject
- NZVI; water treatment; arsenic and selenium removal; competitive adsorption; partition coefficient; SDG 6; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1423609
- Identifier
- uon:37953
- Identifier
- ISSN:0304-3894
- Rights
- © 2021. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
- Language
- eng
- Full Text
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