| 摘要 |
A filtering medium is economically produced by treating a highly humified peat source with an alkaline solution followed by mixing with a quaternary amine compound until the humic and fulvic acids have precipitated. A filter cake is formed from the residue by various means including acid oxidation, heating with or without acid reagent or by semi-coking to produce a final dried poduct having excellent filtering properties for hydrophobic compounds, as well as ion-exchange capacities for both anions and cations from aqueous solution.
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