Cadmium Removal from Aqueous Solution by a Tunisian Smectitic Natural and Activated Clay: Thermodynamic Study
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...It might be explained by the fact that metal ions form complexes with acidic functional groups in the sorbent [92]....
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...The treatments methods, such as chemical precipitation, reverse osmosis, ion exchange and adsorption have been practiced for the removal of heavy metals [2], but these methods are not economical and do not exhibit high treatment efficiency....
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"Cadmium Removal from Aqueous Soluti..." refers background in this paper
...Cadmium is one of the most toxic contaminants found in the environment and is released into the aqueous system from metal plating, smelting, mining cadmium-nickel batteries, phosphate fertilizers, paint industries, pigments, and alloy industries as well as from sewage [3]....
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