Hexavalent chromium removal from water by microalgal-based materials: Adsorption, desorption and recovery studies

Ehsan Daneshvar, Mohammad Javad Zarrinmehr, Masoud Kousha, Atefeh Malekzadeh Hashtjin, Ganesh Dattatraya Saratale, Abhijit Maiti, Meththika Vithanage, Amit Bhatnagar

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140 Scopus citations

Abstract

The current study presents a comprehensive comparison towards the potential of different microalgal-based materials for the removal of hexavalent chromium (Cr(VI)) from water. Among the tested materials, microalgal biochar showed the highest removal efficiency (100%) of Cr(VI). The highest monolayer estimated adsorption capacities were 23.98, 25.19 and 24.27 mg/g at 5, 22 and 35 °C, respectively. Experimental data showed good compliance with pseudo-second-order kinetic model. The results of continuous column studies showed that the column removal efficiency increased from 52.33 to 57.58% by increasing the adsorbent dose from 0.125 to 0.200 g. Desorption efficiency of Cr(VI) by 0.1 M NaOH was increased from 51.16 to 59.41% by sonication bath as compared to roller shaker. More than 97% of desorbed Cr(VI) was recovered in less than 10 min by BaCl2. This study shows that non-living microalga materials are more effective than living cells in the removal and recovery of Cr(VI) from water.

Original languageEnglish
Article number122064
JournalBioresource Technology
Volume293
DOIs
StatePublished - Dec 2019

Keywords

  • Biochar
  • Biosorption
  • Desorption
  • Hexavalent chromium (Cr(VI))
  • Microalga
  • Recovery

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