Design and fabrication of exfoliated Mg/Al layered double hydroxides on biochar support

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yutao Peng
  • Yuqing Sun
  • Aamir Hanif
  • Zhengtao Shen
  • Deyi Hou
  • Yaoyu Zhou
  • Qing Chen
  • Yong Sik Ok
  • Daniel C.W. Tsang

Detail(s)

Original languageEnglish
Article number125142
Journal / PublicationJournal of Cleaner Production
Online published18 Nov 2020
Publication statusOnline published - 18 Nov 2020

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 °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 °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.

Research Area(s)

  • Copper removal, Engineered biochar, Layered double hydroxides, Phosphate adsorption, Sustainable waste management, Wastewater treatment

Citation Format(s)

Design and fabrication of exfoliated Mg/Al layered double hydroxides on biochar support. / Peng, Yutao; Sun, Yuqing; Hanif, Aamir; Shang, Jin; Shen, Zhengtao; Hou, Deyi; Zhou, Yaoyu; Chen, Qing; Ok, Yong Sik; Tsang, Daniel C.W.

In: Journal of Cleaner Production, 18.11.2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review