Can refer our research work in bulletin of material science on lead cations removal from water by anionic adsorbent.

Normally its intra-particle diffusion as well the surface adsorption phenomenon involved in such cationic adsorption process.

You can concentrate on Freundlich adsorption data such as kF parameter and whether bF values are 0 < bF < 1, this range that supports either electrostatic interaction or ion-exchange or a metal adsorption combined mechanism onto adsorbent. Also contributes through a nonspecific electrostatic interaction although less significant compared to other active sites of silicates of rice husk.

Have a look at this link below:

This is quite helpful for us too

Thank you so much for this helpful resource and information

Hi, you can try;

- Removal of Cu and Pb by tartaric acid modified rice husk from aqueous solutions. CHEMOSPHERE Volume: 50 Issue: 1 Pages: 23-28.

- Adsorption of lead and mercury by rice husk ash. JOURNAL OF COLLOID AND INTERFACE SCIENCE Volume: 278 Issue: 1 Pages: 1-8.

- Use of modified rice husks as a natural solid adsorbent of trace metals: characterisation and development ofan on-line preconcentration system for cadmium and lead determination by FAAS.MICROCHEMICALJOURNAL Volume: 77 Issue: 2 Pages: 163-175.

- The sorption of lead(II) ions on rice husk ash. JOURNAL OF HAZARDOUS MATERIALS Volume: 163 Issue: 2-3 Pages: 1254-1264.

- The removal of copper, cadmium and lead by rice husk ash. FRESENIUS ENVIRONMENTAL BULLETIN Volume: 12 Issue: 7 Pages: 736-739.

Good luck!

Thanks