| 摘要 |
PURPOSE: A method for adsorbing and immobilizing heavy metal polluted soil using modified clay and a phosphate-based compound is provided to improve the eliminating effect of heavy metals by eliminating heavy metals from polluted soil and immobilizing the heavy metals. CONSTITUTION: Heavy metals are eliminated from polluted soil by mixing modified clay and the polluted soil. The modified clay is modified with iron oxide or manganese oxide. A phosphate-based compound is further used with the modified clay. The clay is diatomate, montmorillonite, bentonite, zeolite, smectite, phyllosilicate, saponite, beidellite, nontronite, vermiculite, kaolinite, halloysite, mica, muscovite, paragonite, dickite, nacrite, halloysite, antigorite, chrysotile, hectorite, clintonite, donbassite, cookeite, silica, or the combination of the same. The phosphate-based compound is diammonium phosphate, hydroxyapatite, waste phosphoric acid, K_3PO_4, K_2PO_4, KH_2PO_4, CaHPO_4, FeH_2PO_4, FeHPO_4, AlH_2PO_4, Na_2HPO_4, NaH_2PO_4, or the combination of the same. |
