Exploring modified rice straw biochar as a sustainable solution for simultaneous Cr(VI) and Pb(II) removal from wastewater: characterization, mechanism insights, and application feasibility

Yogeshwaran Venkatraman, Priya Arunkumar*, Nadavala Siva Kumar*, Ahmed I. Osman *, Muruganandam Muthiah, Ahmed S. Al-Fatesh, Janardhan Reddy Koduru

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
12 Downloads (Pure)

Abstract

This study aimed to investigate the efficacy of a rice straw biosorbent in batch adsorption for the removal of chromium (Cr(VI)) and lead (Pb(II)) heavy-metal ions from wastewater. The biosorbent was chemically synthesized and activated by using concentrated sulfuric acid. The produced biosorbent was then characterized by using Fourier transform infrared (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) analyses, which provided insights into surface morphology and functional groups. The study examined the effects of pH, rice straw dose, ion concentration, and contact time on metal ion adsorption. Optimal conditions for efficient removal (95.57% for Cr(VI) and 85.68% for Pb(II)) were achieved at a pH of 2.0, a biosorbent dose of 2 g/L, an initial concentration of 20 mg/L, and a contact time of 50 min in synthetic solutions. The isotherms and kinetics model fitting results found that both metal ion adsorption processes were multilayer on the hetero surface of rice straw biosorbent via rate diffusion kinetics. Thermodynamic investigations were conducted, and the results strongly indicate that the adsorption process is endothermic and spontaneous. Notably, the results indicated that the highest desorption rate was achieved by adding 0.3 N HCl to the system.

Original languageEnglish
Article number38130–38147
Number of pages18
JournalACS Omega
Volume8
Issue number41
Early online date28 Sept 2023
DOIs
Publication statusPublished - 17 Oct 2023

Keywords

  • Climate change
  • Net Zero
  • Biochar
  • Water treatment
  • heavy metal removal

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