Removal of Cd from aqueous solution using sugarcane straw nanostructure

The presence of heavy metal in water resources is the cause of many environmental pollutions. This study was carried out with the aim of investigating cadmium removal from aqueous solution using sugarcane straw nanostructure. In this study,the effects of operation conditions including pH, contact time, adsorbent loading, and initial ion concentrations were examined.
The absorption-desorption process was also carried out in five cycles. The results showed that optimum pH for cadmium adsorption is 5, the removal percentage became 94.5 %. The equilibrium time after 10 minutes obtained. With an increase in adsorbent dosage from 0.1 to 0.5 g, the removal percentage from became 88.8% to 94.5% increased. the increase of adsorbent dosage from 0.5 to 2 g did not have a significant effect on removal percentage.
With increase in Cd concentrations (5, 10, 15 and 20 mg/L), removal percentage decreased from 96% to 90%. Comparing the adsorption isotherms showed that the Langmuir model, with R2 value of 0.995 had a better fitting and description of adsorption data than other models. The results of the desorption experiments showed that sugarcane straw adsorbent could reused up to 5 cycles. The result of this study showed that sugarcane straw nanostructure is an effective adsorbent for cadmium removal from aqueous solution.