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本试验研究了一种合成水钠锰矿对Mn~(2+)的持留机理和Mn~(2+)被吸附后的去向,并进一步探讨了三种锰盐溶液(MnSO_4,MN(NO_3)_2和MnCl_2)对水钠锰矿晶体结构变化的影响。 试验结果表明,水钠锰矿对MN~(2+)离子的吸附包括专性吸附和非专性吸附。随着吸附后的老化过程,吸附在矿物表面的锰逐渐扩散到晶格内,其置换性随之降低。 在MnSO_4,Mn(NO_3)_2和MnCl_2溶液中,水钠锰矿最终转化成六方锰矿(Nsutite),一种比水钠锰矿更稳定,结晶更好的晶体。MnSO_4溶液在加入水钠锰矿后pH值比其它两种溶液高,除生成六方锰矿外还形成大量拉锰矿(Ramsdellite)。随着生成新矿物的老化,最初被吸附的Mn被固定在晶格内而失去其置换性和生物有效性。
In this study, the retention mechanism of Mn ~ (2+) and the orientation of Mn ~ (2+) adsorbed by a synthetic birnessite were studied. Three manganese salt solutions (MnSO_4, MN_ (NO_3) _2 And MnCl 2) on the crystal structure of birnessite. The experimental results show that the adsorption of MN2 + ion by birnessite includes both specific adsorption and non-specific adsorption. With the aging process after adsorption, the manganese adsorbed on the mineral surface gradually diffuses into the crystal lattice, and the substitution rate decreases accordingly. In MnSO_4, Mn (NO_3) _2 and MnCl_2 solutions, birnessite eventually turns into Nsutite, a more stable and crystalline better crystal than birnessite. MnSO_4 solution added birnessite after the pH value higher than the other two solutions, in addition to generating hexanum manganese ore also formed a large number of ramnasite (Ramsdellite). With the generation of new minerals, the initially adsorbed Mn is immobilized within the crystal lattice and loses its displaceability and bioavailability.