Journal article
Sorption mechanisms of lead on silicon-rich biochar in aqueous solution: Spectroscopic investigation
The Science of the Total Environment, Vol.672, pp.572-582
01/07/2019
PMID: 30965268
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Abstract
Unraveling sorption mechanisms of lead (Pb) to silicon (Si)-rich biochar at molecular scale in aqueous solution are essential for the effective application of the biochars to the remediation of Pb and other metal(loid)s pollution in the environment. Thus, this study investigated the contributions of phytoliths and other compounds to the Pb sorption on Si-rich coconut fiber biochar (CFB500) and the corresponding sorption mechanisms using spectroscopic techniques, including the micro-X-ray fluorescence (μ-XRF), X-ray absorption fine structure (XAFS), scanning electron microscopy combined with energy dispersive X-ray spectroscopy, and X-ray diffraction. The μ-XRF and XAFS results showed that K, Ca, Cu, Mn, and Fe were released and significantly related to Pb in Pb-loaded CFB500; four major Pb species were formed with similar structures to lead carboxylate (e.g., Pb(C2H3O2)2), Pb3(PO4)2, PbSiO3, and PbCO3. On phytoliths in CFB500, Pb2+ ions were mainly sorbed on the sites of silicate with a structure similar to PbSiO3. The contribution of binding sites for Pb2+ sorption was ascribed to the outer-wall of carbon skeleton of CFB500, which was stronger than that provided by the mineral oxide aggregate and phytoliths on CFB500. Organic carbon functional groups, inorganic carbonates, silicates and phosphates on CFB500 mostly dominated the sorption sites for Pb2+. Our results suggest that CFB500 was a promising material for the remediation of Pb-contaminated aqueous environments (e.g., wastewater).
Details
- Title
- Sorption mechanisms of lead on silicon-rich biochar in aqueous solution: Spectroscopic investigation
- Creators
- Jianhong Li - Hainan UniversityLirong Zheng - Chinese Academy of SciencesShan-Li Wang - National Taiwan UniversityZhipeng Wu - Hainan UniversityWeidong Wu - Hainan UniversityNabeel Khan Niazi - University of Agriculture FaisalabadSabry M Shaheen - University of WuppertalJörg Rinklebe - University of WuppertalNanthi Bolan - University of NewcastleYong Sik Ok - Korea UniversityHailong Wang - Zhejiang A & F University
- Publication Details
- The Science of the Total Environment, Vol.672, pp.572-582
- Publisher
- Elsevier BV
- Grant note
- This work was financially supported by the National Key Research and Development Program of China (2018YFD0800703, 2017YFD0202101), the Natural Science Foundation of China (21577131, 21866013, 21876027), Guangdong Provincial Natural Science Foundation, China (2017A030311019), Hainan Provincial Natural Science Foundation, China (Grant Nos. 317190 and 418QN208), the Postgraduate Innovation Project of Hainan Province (Hyb2017-20), the Crop Science Postgraduate Innovation Project of Hainan University Tropical Agriculture and Forestry College (ZWCX2018013), and the Ecology Discipline Construction Funding of Hainan University. Thanks are extended by Professor Sabry M. Shaheen to the Alexander von Humboldt Foundation for the Postdoctoral Research Fellowship (Ref 3.4 - EGY - 1185373 - GF-E) at the University of Wuppertal, Germany.
- Identifiers
- 991012951096302368
- Copyright
- © 2019 Published by Elsevier B.V.
- Academic Unit
- School of Environment, Science and Engineering; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article