Design and fabrication of exfoliated Mg/Al layered double hydroxides on biochar support
- Authors
- Peng, Yutao; Sun, Yuqing; Hanif, Aamir; Shang, Jin; Shen, Zhengtao; Hou, Deyi; Zhou, Yaoyu; Chen, Qing; Ok, Yong Sik; Tsang, Daniel C. W.
- Issue Date
- 20-3월-2021
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Engineered biochar; Layered double hydroxides; Sustainable waste management; Phosphate adsorption; Copper removal; Wastewater treatment
- Citation
- JOURNAL OF CLEANER PRODUCTION, v.289
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF CLEANER PRODUCTION
- Volume
- 289
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/128399
- DOI
- 10.1016/j.jclepro.2020.125142
- ISSN
- 0959-6526
- Abstract
- Tailored design and fabrication of biochar-based adsorbents with high porosity and well dispersion is a critical process for enhancing their environmental applications. To elucidate the material structure-performance relationship, this study synthesized and compared corn straw biochar-supported Mg/Al layered double hydroxides composites (LDHs-BCs) using conventional co-precipitation or aqueous miscible organic solvent treatment (AMOST) methods under various pyrolysis temperatures (350, 550, 750, and 950 degrees C) and metal loadings (5 and 15 wt%). The comprehensive surface characterization demonstrated enlarged interlayer spacing, increased specific surface area, and smaller crystal size of LDHs as well as lowered intensities of O-containing functional groups in LDHs-BCs. These results suggested that, in comparison to conventional co-precipitation method, AMOST method can serve as a simple, cost-effective, and robust method to induce exfoliation, higher dispersion, and more stable attachment of LDHs on the biochar surface. The Langmuir adsorption isotherms further demonstrated that the AMOST-derived composites prepared at higher temperatures (i.e., 750 and 950 degrees C) and lower metal loading (i.e., 5 wt%) exhibited superior contaminant removal capacities (280.7-286.2 mg PO43-/g and 92.5-94.7 mg Cu(II)/g at pH 5.0-6.0). The synergistic effect was attributed to coupled functionalization of LDHs and biochar under customized synthesis conditions. These results provide valuable insights into fabricating high-performance and environmentally friendly LDHs-BCs for green remediation and sustainable development. (C) 2020 Elsevier Ltd. All rights reserved.
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Collections - College of Life Sciences and Biotechnology > Division of Environmental Science and Ecological Engineering > 1. Journal Articles
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