Removal of Heavy Metal Ions from Aqueous Solution by Raw and Modified Diatomite

Abstract:

Removal of heavy metal ions (Cu²⁺, Pb²⁺ and Ni²⁺) from aqueous solution by raw and modified diatomite was investigated in a batch reactor. The diatomite was modified by acid-wash and base-wash, respectively. The influence of kind of diatomite, contact time and initial concentration of metal ions on the adsorption efficiency were studied. The results showed that the acid-washed diatomite showed the best adsorption capacity for all of Cu²⁺, Pb²⁺ and Ni²⁺) among raw, acid-washed and base-washed diatomites. Metal ions adsorption amount on A-diatomite increased in the initial concentration range from 10 to 50ppm and in general kept constant after the initial concentration was higher than 60ppm. The result also indicated that Ni²⁺ is more easily adsorbed on the surface of diatomite than Pb²⁺ and Cu²⁺.

• Periodical: Applied Mechanics and Materials (Volumes 522-524)
• Pages: 656-659
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.522-524.656
• Online since: February 2014
• Authors: Wen Sheng Linghu, Jia Ming Cui
• Keywords: Adsorption, Diatomite, Heavy Metal Ion, Wastewater

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