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草酸与pH对矿物吸附Cd(Ⅱ)的影响及机制

Keywords: 草酸,pH,矿物,镉离子吸附

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Abstract:

用吸附平衡法研究草酸、pH对针铁矿、三羟铝石、三水铝石、高岭石吸附Cd2+的影响及机制。结果表明,供试矿物对Cd2+的吸附量为:针铁矿>高岭石≥三羟铝石>三水铝石。草酸对Cd2+吸附的影响呈峰形曲线变化,低浓度的草酸(小于1或1.25mmol·L-1)促进矿物对Cd2+的吸附;高浓度的草酸(大于1或1.25mmol·L-1)抑制Cd2+的吸附。不同pH下,草酸浓度对Cd2+吸附率的影响明显不一样,体系pH(pH7时,草酸则抑制Cd2+的吸附。这主要与吸附体系中矿物表面性质的改变、Cd2+的存在形态、草酸在固液相间的分配有关。

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