HYBRID EVENT: You can participate in person at Rome, Italy or Virtually from your home or work.

10th Edition of World Nanotechnology Conference

March 10-12, 2025

March 10 -12, 2025 | Rome, Italy
World Nano 2023

Sikirat Kehinde Sheu

Sikirat Kehinde Sheu, Speaker at Nanomaterials Conference
University of York, United Kingdom
Title : Gold nanoparticles as an efficient adsorbent for the removal of heavy metals from aqueous solution


Adsorption of Cu and Ni (II) ion by gold nanoparticles was successfully achieved by synthesizing gold nanoparticle by chemical reduction with sodium citrate tribasic and cysteine as the capping agent. The synthesized nanoparticles were characterized by Fourier Transform Infrared spectroscopy, UV visible spectroscopy, Scanning Electron Microscopy, Powder XRay Diffractometer, Inductively Coupled Plasma  mass Spectrometry, Thermal Gravimetric Analysis and porosimetry. The result obtained from Fourier Transform Infrared spectroscopy  revealed that there are some appearance and disappearance of some peaks which indicate the formation of gold nanoparticles, the result obtained from Inductively Coupled Plasma Mass Spectrometry revealed that the nanoparticles is 63 percent gold. 

The observation from the thermal analysis revealed that the gold nanoparticles is 97% stable at 625 oC as it would be expected for gold. The result from Scanning Electron Microscope revealed the structural morphology to be spherical monodispersed and porous, the porosimetry analysis revealed the size of the nanoparticles to be  smaller in size and   also  falls within the nano. The UV visible spectroscopy reveals the information of the synthesized nanoparticles to be suitable for colorimetric sensing of the two metal ions.

The physiochemical study revealed that the colorimetric sensing of cadmium  and lead ions by gold nanoparticles at different concentrations  ranging from 0.5 -20ppm.The maximum uptake was achieved with 9.8mg/g at 20ppm for  Cu(II) ions and 11.82mg/g at 20ppm for Ni(II) ions. The effect of contact time was studied for the optimal concentration for reaction time  ranging from 5minutes to 24 hours .The optimal uptake occurs  at 1hour and maintains  stability till 24hours reaction time with 4.45mg/g for Cu(II) ion and 7.08mg/g  for Ni(II) ions was  being observed at 1 hours reaction time and remaining stable  till 24hours reaction time for the two ions .The effect of pH (3,6,9 and 12 )on the adsorption of Cu(II) by gold nanoparticles revealed that maximum uptake was found at a PH of  9 with uptake of 9.8mg/g while maximum uptake occurs for Ni(II) ions at a pH of 12 with 10.6mg/l The effect of adsorbent dose was also studied at (0.01g,0.03g and 0.05g). The result shows maximum uptake for Cu(II) ion at a dose of 0.01g with uptake of 4mg/g while for Ni(II) ions at 0.01g with uptake of 4.5mg/g Study from effect of temperature (30,60 and 90oC )shows that the maximum uptake for Cu(II)ions  occurs at 90 o C with maximum uptake of 13mg/l and for Ni(II) ions occur at 90 o C with maximum uptake of 15mg/g.

Audience take away:

  • How to synthesize nanoparticles.
  • Information on the nanoparticle’s characterization.
  • Application of nanomaterial in tackling environmental problem.


She studied Chemistry at the University of Ilorin, Nigeria and graduated as MS in 2018. She joined the research group of Dr. James at the Green Chemistry Centre of Excellence, York, United Kingdom as a PhD student researching on Synthesis, structural characterization and application of Metal Nanoparticles.