Comparative adsorption studies of cadmium ions on phosphogypsum and natural clay

Scientific African

Hicham Nafai¹  Amine Es-said²  Ghita Lamzougui³  Rahma Bchitou³  Ahmed Bouhaouss³ 

[1] Laboratory of Materials, Nanotechnology and Environment, Department of Chemistry, Faculty of Sciences, Mohammed V University, Rabat, Morocco;Corresponding author.;Laboratory of Materials, Nanotechnology and Environment, Department of Chemistry, Faculty of Sciences, Mohammed V University, Rabat, Morocco;

关键词: Cadmium ion;    Phosphogypsum;    Natural clay;    Aqueous solution;    Environmental protection;   

DOI  :  

来源: DOAJ

【 摘 要 】

Cadmium ions pollution and waste resulting from industrial activities are classified as serious environmental problems. In this study, we performed comparative adsorption studies of cadmium (II) on phosphogypsum (PG) and natural clay (NC) from an aqueous solution. The difference in adsorption mechanisms between phosphogypsum and natural clay was inspected using scanning electron micrographs; X-ray diffraction and Fourier transform infrared. The effects of contact time and certain factors such as the adsorbent dosage and the pH of the solution were studied. The comparative study shows that the differences in adsorption behavior come from the chemical and structural differences of the adsorbents studied. It was found that 0.73 mg·g−1 is the maximum adsorption capacity for phosphogypsum, whereas for natural clay it was 5.65 mg·g−1. Cadmium (II) removal was pH-dependent and the optimum adsorptions of phosphogypsum and clay were found at pH basic. It has been confirmed that the pseudo-second order model is best suited to the kinetics of the process studied for the two adsorbents. Overall, natural clay is a better adsorbent than phosphogypsum and this latter can be used as a potential adsorbent candidate for the removal of Cd(II) from aqueous solutions.

【 授权许可】

Unknown