What is it about?
The mechanism of lead and nickel retention on the developed adsorbent is considered as a combination of adsorption, ion-exchange and precipitation processes. At basic pH values and with the adsorption results obtained in this paper proposes a kind of complex surface based on the formation of metal hydroxide on the surface of the original adsorbent. It is also shown that the lead-saturated adsorbent could be stabilized by means of a heat treatment.
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Why is it important?
The physicochemical characteristics of the granulated adsorbent allow the retention of lead from the aqueous solutions when passed through of an adsorption column, and the lead concentration in wastewater can fulfill the maximum permissible limits of national regulations.
Perspectives
The ceramic adsorbent based in a potassium titanate doped with silica (granulated form) are excellent adsorbents in adsorption columns and results have shown the capacity for removal of lead and nickel from aqueous solutions. The mechanism for removal of metallic ions consist of an adsorption process combined with ionic exchange and precipitation.. After reaching the maximum adsorption capacity the adsorbent can be heat treated to stabilize lead o nickel in the structure of the ceramic as PbTiO3 lead titanate or NiTiO3 nikckel titanate . The inert condition of the obtained ceramic allows its use for several applications such as ceramic substrates and pigments.
Dr Miguel Ángel Aguilar González
Center for investigation and advanced studies of national polytechnique institute
Read the Original
This page is a summary of: Removal of lead and nickel from aqueous solutions by SiO2 doped potassium titanate, Materials Science and Engineering B, October 2010, Elsevier,
DOI: 10.1016/j.mseb.2010.03.057.
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