Freeze-dried agarose gels: A cheap, simple and recyclable adsorbent for the purification of methylene blue from industrial wastewater

Wei Yang Seow*, Charlotte Hauser

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

Dye colourants are being produced yearly on the kilotonne-scale and a significant percentage end up as highly-polluting industrial effluents. Freeze-dried agarose gels are demonstrated here to be efficient adsorbents for the removal of methylene blue, an important industrial dye. A hydrogel adsorbent offers advantages over powdered formulations, which can be difficult to handle. Freeze-drying further allows the adsorbent to be packaged, transported and stored in a dry format, thus conferring cost savings. Parameters such as the volume or concentration of agarose or dye, exposure time, pH and gel/water contact area influenced adsorption capacity and kinetics. Salt inhibited adsorption in a dose-dependent manner and this was exploited for the recycling of adsorbent and dye. Langmuir and Freundlich isotherms were also applied to model the adsorption process. The freeze-dried agarose gel achieved an adsorption capacity of 10.4 ± 0.2 mg/g, which was comparable to commercial activated carbon assessed under similar conditions. Additionally, unlike most activated carbon, agarose is derived from a renewable source. Since agarose is cheaply available commercially, this method can enjoy rapid industrial translation.

Original languageEnglish (US)
Pages (from-to)1714-1721
Number of pages8
JournalJournal of Environmental Chemical Engineering
Volume4
Issue number2
DOIs
StatePublished - Jun 1 2016

Keywords

  • Adsorption
  • Agarose hydrogel
  • Freeze dry
  • Methylene blue
  • Textile and industrial wastewater
  • Water purification

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Waste Management and Disposal
  • Pollution
  • Process Chemistry and Technology

Fingerprint

Dive into the research topics of 'Freeze-dried agarose gels: A cheap, simple and recyclable adsorbent for the purification of methylene blue from industrial wastewater'. Together they form a unique fingerprint.

Cite this