Fabrication and characterization of a novel Ba2+-loaded sawdust biochar doped with iron oxide for the super-adsorption of SO42− from wastewater

Warda Khalid, Chin Kui Cheng, Peng Liu, Jinping Tang, Xin Liu, Asmat Ali, Asfandyar Shahab, Xingjie Wang

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9 Scopus citations

Abstract

Biochar is a low-cost adsorbent used in the treatment of contaminated wastewater. We investigated the potential of an Fe-impregnated, Ba2+-loaded biochar (Fe-(Ba-BC)) for the removal of SO42− from aqueous solutions. The Ba2+-loaded biochar was synthesized from sawdust impregnated with iron oxide via pyrolysis at 600 °C. The porous structure of the Fe-(Ba-BC) was identified by scanning electron microscopy before sulfate was adsorbed onto the adsorbent. Functional groups were determined by energy-dispersive spectrophotometry and Raman spectrometry. The Fe-(Ba-BC) Raman peaks before the experiment were higher than after, suggesting the precipitation of BaSO4. The presence of BaCl2 on the surface of the biochar was confirmed by X-ray diffraction. Batch sorption results showed that Fe-(Ba-BC) strongly adsorbed aqueous SO42− with a removal efficacy of 96.7% under the optimum conditions of 0.25 M BaCl2, a contact time of 480 min, a pH of 9 and an adsorbent dose of 2 g. The optimum condition for removal and reaction rate kinetics analysis indicated that adsorption curve fitted well with PSO, k2 0.00015 confirmed the removal of SO42− via chemisorption. Thus, Fe-(Ba-BC) was found to be a favorable adsorbent for removing SO42−.

Original languageBritish English
Article number135233
JournalChemosphere
Volume303
DOIs
StatePublished - Sep 2022

Keywords

  • Activated biochar
  • Adsorption kinetics
  • Chemisorption
  • Sulfate removal
  • Wastewater treatment

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