Facile One-Pot Synthesis of Sustainable Carboxymethyl Chitosan – Sewage Sludge Biochar for Effective Heavy Metal Chelation and Regeneration

Jerosha Ifthikar, Xiang Jiao, Audrey Ngambia, Ting Wang, Aimal Khan, Ali Jawad, Qiang Xue, Lei Liu, Zhuqi Chen

Research output: Journal PublicationArticlepeer-review

120 Citations (Scopus)

Abstract

In this paper, sewage sludge, a solid waste from wastewater treatment plant, which eagerly requires proper treatment was reused as solid support in the form of sewage sludge biochar, then modified with carboxymethyl chitosan to form a bio-adsorbent. Further, carboxymethyl chitosan coating on sewage sludge biochar improved carboxymethyl chitosan's stability in water. The prepared bio-adsorbent revealed a shorter equilibrium time (<60 min) for Pb(II) adsorption and a superior capacity of 594.17 mg g−1 for Hg(II) adsorption, which are so far the best recorded performance achieved for chitosan based adsorbents. Additionally, the adsorbent was highly selective for heavy metal ions and it also presented a good stability and reusability for industrial applications. These outcomes demonstrate waste valorization through a green, facile and one-pot approach that turns the solid waste of sewage sludge into biochar adsorbent with propitious applications in the elimination of heavy metal ions from wastewater.

Original languageEnglish
Pages (from-to)22-31
Number of pages10
JournalBioresource Technology
Volume262
DOIs
Publication statusPublished - Aug 2018
Externally publishedYes

Keywords

  • Adsorption
  • Carboxymethyl chitosan
  • Lead
  • Mercury
  • Sewage sludge biochar

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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