Biosynthesis of aluminium oxide nanobiocomposite and its application for the removal of toxic metals from drinking water

Ashfaque Ali Bhutto, Jameel Ahmed Baig, Siraj uddin, Tasneem Gul Kazi, Reyes Sierra-Alvarez, Khalil Akhtar, Saima Perveen, Hassan Imran Afridi, H. Elhosiny Ali, Aysen Hol, Suraya Samejo

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


This work aimed to synthesize the aluminium oxide nanoparticles using Ixoro coccinea leaf extract. Furthermore, the synthesized Ixoro coccinea aluminium oxide nanoparticles (I–Al2O3-NPs) and nanocomposites (I–Al2O3-NC), including them as the fillers in a chitosan matrix were characterized, and I–Al2O3-NC was applied to remove the toxic metals (TMs) including Cd, Ni, and Pb from water. Optimization of different batch experimental adsorption parameters (pH, concentration of TMs, dose of I–Al2O3-NC, temperature, and time of contact) was done to check the feasibility of I–Al2O3-NC for maximum removal of TMs from water. The extreme adsorption capacities using nanocomposites for Cd, Ni, and Pb were 66.0, 60.0, and 66.4 mg g−1, respectively. The I–Al2O3-NC followed the Freundlich isotherm model for removing Cd and Ni while showing the monolayer surface coverage for the removal of Pb. For this process, the best-fitted kinetic model was the pseudo-second-order equation. The enthalpy, entropy, and free energy of metal ion adsorption, among other parameters of thermodynamics, were estimated. The process was found to be exothermic, advantageous, and spontaneous. Kinetic studies show that intra-particle diffusion is essential for eliminating TMs. In addition, I–Al2O3-NC was applied for the adsorption of TMs from surface water and determined to be effective in removing these contaminants up to an acceptable drinking water standard. Regeneration of adsorbent suggested that green synthesized I–Al2O3-NC may be an active tool for removing Cd, Ni, and Pb ions from contaminated water.

Original languageEnglish (US)
Pages (from-to)14615-14623
Number of pages9
JournalCeramics International
Issue number9
StatePublished - May 1 2023


  • Adsorption
  • Contaminated water
  • I–AlO-NC
  • I–AlO-NP
  • Kinetic
  • Thermodynamics
  • Toxic metal ions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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