Novel Fe3O4-Modified Biochar Derived from Citrus Bergamia Peel: A Green Synthesis Approach for Adsorptive Removal of Methylene Blue

Swagatika Tripathy, Sumanta Sahu, Raj Kishore Patel, Rahas Bihari Panda, Pravin Kumar Kar

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The present study reveals the enhanced bio-sorption of methylene blue (MB) from an aqueous solution using iron oxide immobilized citrus bergamia biochar (Fe3O4CBC). The adsorption efficiency was increased dramatically from 64 % to 98 % after the magnetic iron oxide modification to citrus bergamia biochar (CBC) due to electrostatic interaction. Physico-chemical alterations of CBC surface prior and post-modification and after dye adsorption were evaluated using the following surface techniques such as FTIR, XRD, SEM, BET, Raman, TGA-DTA, Zeta potential analysis. The retention of C−OH, C=O, C−O, C−H, and Fe3O4 groups were confirmed from FTIR spectra. BET analysis revealed that Fe3O4CBC showed an elevated surface area of 136.72 m2 g−1 with a reduced pore diameter of 3.73 nm than CBC. The Pseudo second order and Langmuir isotherm model was best fitted with R2=0.99 and adsorption capacity of 31 mg/g. The thermodynamic data (ΔS=0.1455 kJ mol−1 K−1, ΔH=33.87 kJ mol−1) revealed the spontaneity, endothermic nature, and feasibility of adsorption process. Regeneration studies revealed that the material has excellent sorption-based performance over five consecutive cycles. The current work demonstrates that Fe3O4CBC can serve as a highly efficient, cost-effective, bio adsorbent for the removal of MB with easy magnetic separation from aqueous medium.

Original languageEnglish
Article numbere202103595
JournalChemistrySelect
Volume7
Issue number10
DOIs
StatePublished - 15 Mar 2022
Externally publishedYes

Keywords

  • Adsorption
  • FeO
  • citrus bergamia biochar
  • kinetics study
  • methylene blue
  • thermodynamic study

ASJC Scopus subject areas

  • Chemistry (all)

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