Low-cost biochar adsorbents prepared from date and delonix regia seeds for heavy metal sorption

Dan Bahadur Pal, Arvind Singh, Jay Mant Jha, Neha Srivastava, Abeer Hashem, Maha Abdullah Alakeel, Elsayed Fathi Abd_Allah, Vijai Kumar Gupta*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

68 Citations (Scopus)
23 Downloads (Pure)


In this study, low-cost biochar as bio-adsorbents derived from locally accessible delonix regia seed and date seeds were explored for heavy metal environmental cleaning. These prepared biochars were characterized by proximate and elemental analyses, CHNS/O analysis, Fourier-transformed infrared spectroscopy and thermo-gravitational methods. Bio-sorbent's ability to adsorb arsenic ions in synthetic wastewater was studied and optimized at varying solution pH, adsorbent dose, and starting metal concentrations. Experimentation and optimization studies were also carried out with the help of Design-software 6.0.8. The trials were designed by using response-surface methods, which includes three components and stages of Box-Behnken design. Date seeds derived-biochars eliminated 95% of arsenic from synthetic wastewater, whereas Delonix regia seeds removed 93.8%. The kinetics, isotherms and mechanism of As adsorption were also postulated. This study proposes that these seed's biochars might be employed as an effective, low-cost, and environmentally friendly adsorbent to remove heavy metals from the environment.

Original languageEnglish
Article number125606
JournalBioresource Technology
Early online date19 Jul 2021
Publication statusPrint publication - Nov 2021


  • Adsorption
  • Arsenic removal
  • Biochar
  • Date seeds
  • Delonix regia seed


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