Abstract
The present work deals with the synthesis, characterization and cadmium adsorption studies on SiO2, Fe(OH)3 and their mixed oxides. Mixed oxides of iron and silicon of composition [0.5 M SiO2:0.5 M Fe(OH)3] were prepared by physical mixing (M1) and sequential precipitation methods (M2). The selectivity of adsorbents towards Cd2+ ion was found to be in the order M2 > M1 = Fe(OH)3 > silica. Dissolution of silica, mixed oxides M1 and M2 was also investigated in the pH range 3–10. The greater dissolution of mixed oxide M2, along with the higher selectivity towards Cd2+ ions showed the formation of the ternary complexes on the surface of M2. The complex formation was also confirmed by IR studies and by the increase in Cd2+ sorption with the addition of the silicates anions in the medium. The thermodynamic parameters showed the Cd2+ sorption to be endothermic and spontaneous in nature.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
