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This study tested magnetic hemp hurd biochar (MHB) for CR removal from aqueous solutions. FeCl3 modified hemp hurd, which was pyrolyzed to make MHB. SEM investigation revealed a heterogeneous surface with an average pore size of 4.84 µm in MHB. Fe–O can be detected by FT-IR absorbance peaks at 770 cm−1. Also, peaks at 1264 cm−1, 1420 cm−1, and 1585 cm−1 suggested oxygen-laden functional groups. MHB was an excellent CR adsorbent due to its high carbon, oxygen, and iron content. Optimal reaction time: 120 min, pH: 8, MHB concentration: 0.6 mg/L removed 92% of CR. Due to the heterogeneous MHB surface, the freundlich isotherm (R2—0.97) fit CR adsorption well. The pseudo-second order model matched CR well with an R2 value of 0.98, suggesting chemisorption. The composite material also maintained 85% removal efficacy across three regeneration cycles, demonstrating its reusability and stability.

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Congo Red Removal from Aqueous Solution Using Magnetic Hemp Hurd Biochar Produced Through Microwave Pyrolysis

  • 会议论文

  • 发表日期：

    2025年

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  • Rejeti Venkat Srinadh,
  • Dhiman Kashyap,
  • Remya Neelancherry

摘要

This study tested magnetic hemp hurd biochar (MHB) for CR removal from aqueous solutions. FeCl3 modified hemp hurd, which was pyrolyzed to make MHB. SEM investigation revealed a heterogeneous surface with an average pore size of 4.84 µm in MHB. Fe–O can be detected by FT-IR absorbance peaks at 770 cm−1. Also, peaks at 1264 cm−1, 1420 cm−1, and 1585 cm−1 suggested oxygen-laden functional groups. MHB was an excellent CR adsorbent due to its high carbon, oxygen, and iron content. Optimal reaction time: 120 min, pH: 8, MHB concentration: 0.6 mg/L removed 92% of CR. Due to the heterogeneous MHB surface, the freundlich isotherm (R2—0.97) fit CR adsorption well. The pseudo-second order model matched CR well with an R2 value of 0.98, suggesting chemisorption. The composite material also maintained 85% removal efficacy across three regeneration cycles, demonstrating its reusability and stability.