Competitive sorption of heavy metals by water hyacinth roots

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

56 Scopus Citations
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Author(s)

  • Jia-Chuan Zheng
  • Hou-Qi Liu
  • Hui-Min Feng
  • Wen-Wei Li
  • Michael Hon-Wah Lam
  • And 2 others
  • Paul Kwan-Sing Lam
  • Han-Qing Yu

Detail(s)

Original languageEnglish
Pages (from-to)837-845
Journal / PublicationEnvironmental Pollution
Volume219
Online published9 Aug 2016
Publication statusPublished - Dec 2016

Abstract

Heavy metal pollution is a global issue severely constraining aquaculture practices, not only deteriorating the aquatic environment but also threatening the aquaculture production. One promising solution is adopting aquaponics systems where a synergy can be established between aquaculture and aquatic plants for metal sorption, but the interactions of multiple metals in such aquatic plants are poorly understood. In this study, we investigated the absorption behaviors of Cu(II) and Cd(II) in water by water hyacinth roots in both single- and binary-metal systems. Cu(II) and Cd(II) were individually removed by water hyacinth roots at high efficiency, accompanied with release of protons and cations such as Ca2+ and Mg2+. However, in a binary-metal arrangement, the Cd(II) sorption was significantly inhibited by Cu(II), and the higher sorption affinity of Cu(II) accounted for its competitive sorption advantage. Ionic exchange was identified as a predominant mechanism of the metal sorption by water hyacinth roots, and the amine and oxygen-containing groups are the main binding sites accounting for metal sorption via chelation or coordination. This study highlights the interactive impacts of different metals during their sorption by water hyacinth roots and elucidates the underlying mechanism of metal competitive sorption, which may provide useful implications for optimization of phytoremediation system and development of more sustainable aquaculture industry.

Research Area(s)

  • Aquaculture, Binary-metal system, Competitive sorption, Heavy metal, Ionic exchange, Water hyacinth roots

Citation Format(s)

Competitive sorption of heavy metals by water hyacinth roots. / Zheng, Jia-Chuan; Liu, Hou-Qi; Feng, Hui-Min et al.
In: Environmental Pollution, Vol. 219, 12.2016, p. 837-845.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review