Removal of Cadmium (II) from Aqueous Solution by Rice Husk Waste

Rice husk is one of the best possible ingredients waste for producing a range of value-added goods, whether in the form of raw materials, ash, or char. Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and BET surface area measurements Characterization were used to describe the adsorbent that had been processed. The impact of initial concentration, solution pH, and rotation time was investigated in the batch study. The modified rice husk adsorbent obtained a larger surface area, showed a good removal rate, and highest adsorption capacity compared to the pure rice husk. The maximum removal rate of cadmium obtained by modified rice husk and pure rice husk were 78% and 67% at 25mg/L initial concentration, respectively. The optimal pH was found at a 6-pH solution and the removal rate and adsorption capacity were found high at an early stage of agitation time and reach the highest at 3 hours of agitation time then no significant improvement occurred.