Uptake of gold (III) from waste gold solution onto biomass-based adsorbents organophosphonic acid functionalized spent buckwheat hulls

- Feasibility of novel functionalized buckwheat hulls OPA-BH for gold uptake was confirmed.
- The low-cost biosorbent had very high adsorption capacity for Au(III).
- The biosorption process optimization was performed using response surface methodology.
- Desorption and regeneration studies were conducted to evaluate this adsorbent efficiency.