Research on Lead (II) Adsorption Mechanism from Aqueous Solution by Calcium Carbonate Modified Diatomite Absorbent

Abstract:

In this study, calcium carbonate was used to coat and link the surface of diatomite for the formation of a novel modified adsorbent (referred to as Ca–diatomite). Various analytical techniques were used to characterize structure and mechanisms of modification and adsorption process, like Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). Results showed that that Calcium carbonate had been successful grafted onto the surface of diatomite after modification, and Calcium carbonate modification improved the adsorption performance of diatomite for the removal of lead (II) ions from aqueous solution. Ca–diatomite adsorption isotherms and adsorption kinetics were also been studied. The adsorption isotherms and the kinetic data were best fitted with the Langmuir model and pseudo-second-order kinetics, respectively.

• Periodical: Materials Science Forum (Volume 921)
• Pages: 21-28
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.921.21
• Online since: May 2018
• Authors: Li Li Ma, Qing Lin Xie*, Nan Chun Chen, Hui Xu, Hai Miao Zhou, Qing Feng Yu
• Keywords: Adsorption, Calcium Carbonate, Lead, Mechanism, Modified Diatomite

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