Journal article
Arsenic removal by Japanese oak wood biochar in aqueous solutions and well water: Investigating arsenic fate using integrated spectroscopic and microscopic techniques
Science of the Total Environment, Vol.621, pp.1642-1651
15/04/2018
PMID: 29054629
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Abstract
In this study, we examined the sorption of arsenite (As(III)) and arsenate (As(V)) to Japanese oak wood-derived biochar (OW-BC) in aqueous solutions, and determined its efficiency to remove As from As-contaminated well water. Results revealed that, among the four sorption isotherm models, Langmuir model showed the best fit to describe As(III) and As(V) sorption on OW-BC, with slightly greater sorption affinity for As(V) compared to As(III) (QL = 3.89 and 3.16 mg g− 1; R2 = 0.91 and 0.85, respectively). Sorption edge experiments indicated that the maximum As removal was 81% and 84% for As(III)- and As(V)-OW-BC systems at pH 7 and 6, respectively, which decreased above these pH values (76–69% and 80–58%). Surface functional groups, notably single bondOH, single bondCOOH, single bondCsingle bondO, single bondCH3, were involved in As sequestration by OW-BC, suggesting the surface complexation/precipitation and/or electrostatic interaction of As on OW-BC surface. Arsenic K-edge X-ray absorption near edge structure (XANES) spectroscopy indicated that 36% of the added As(III) was partially oxidized to As(V) in the As(III) sorption experiment, and in As(V) sorption experiment, 48% of As(V) was, albeit incompletely, reduced to As(III) on OW-BC surface. Application of OW-BC to As-contaminated well water (As: 27–144 μg L− 1; n = 10) displayed that 92 to 100% of As was depleted despite in the presence of co-occurring competing anions (e.g., SO42 −, CO32 −, PO43 −). This study shows that OW-BC has a great potential to remove As from solution and drinking (well) water. Overall, the combination of macroscopic sorption data and integrated spectroscopic and microscopic techniques highlight that the fate of As on biochar involves complex redox transformation and association with surface functional moieties in aquatic systems, thereby providing crucial information required for implication of biochar in environmental remediation programs.
Details
- Title
- Arsenic removal by Japanese oak wood biochar in aqueous solutions and well water: Investigating arsenic fate using integrated spectroscopic and microscopic techniques
- Creators
- Nabeel Khan Niazi - University of Agriculture FaisalabadIrshad Bibi - University of Agriculture FaisalabadMuhammad Shahid - COMSATS Institute of Information TechnologyYong Sik Ok - Korea UniversitySabry M Shaheen - University of KafrelsheikhJörg Rinklebe - University of WuppertalHailong Wang - Zhejiang A & F UniversityBehzad Murtaza - COMSATS Institute of Information TechnologyEjazul Islam - National Institute for Biotechnology and Genetic EngineeringM Farrakh Nawaz - University of Agriculture FaisalabadAndreas Lüttge - University of Bremen
- Publication Details
- Science of the Total Environment, Vol.621, pp.1642-1651
- Publisher
- Elsevier BV
- Grant note
- International Foundation for Science (IFS, Sweden; W/5698-1) Higher Education Commission of Pakistan (Project Nos. 6396 and 6425) Grand Challenges Canada – Stars in Global Health (GCC 0433-01) Alexander von Humboldt Foundation - Postdoctoral Research Fellowship
- Identifiers
- 991012951091102368
- Copyright
- © 2017 Elsevier B.V. All rights reserved.
- Academic Unit
- Science; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article