Performance Comparison of Chemically Modified Sugarcane Bagasse for Removing Cd(II) in Water Environment

This paper evaluates the adsorption capacity of chemically sugarcane bagasses with sodium hydroxide(SHS),citric acid(CAS),tartaric acid(TAS)and unmodified sugarcane bagasse(SB)for cadmium adsorption in water environment.The results prove adsorption capacity for Cd(II)increases after chemical modification and the adsorption fits perfectly with the Langmuir isotherm.CAS had the highest maximum adsorption capacity of 45.45 mg/g followed by TAS with 38.46 mg/g and SHS with 29.41 at optimum pH 5.0 and 120 minutes equilibrium time while 1 g SB removed 18.8 mg Cd(II)in the same conditions.The kinetics study of the process followed a pseudo-secondorder rate expression,that indicated a strong interaction between the biosorbents and adsorbate.The sugarcane bagasse and modified sugarcane bagasse were characterized by scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR)analysis.The chemical modification was confirmed by the presence of carboxyl and esters groups created at 1,738 cm-1.The estimation of acid groups in modified materials shows the enhancement of this group after modification.On the other hand,desorption studies showed the high leaching of cadmium ion from the biosorbent leading to the efficient reutilization of materials.