Cassava root husks powder as green adsorbent for the removal of Cu(II) from natural river water

- Cassava husks adsorbent require an extremely simple preparation way.
- Cassava husks present similar adsorption capacity compared with other adsorbents.
- High stability of cassava husks surface enables 40 desorption/adsorption cycles.
- Its use in continuous flow system enables an enrichment factor of 41-fold.
- The preconcentration system enables safe quantification of trace Cu(II) level in natural water.