铁氧化物掺杂对沉积物吸持Cu与Zn能力的影响

Effect of Iron Oxides Spiked in the Sediments on the Sorption Ability of Cu and Zn

通过分析铁氧化物、铁氧化物掺杂前后沉积物吸附/解吸特性的变化规律,研究针铁矿、赤铁矿、水铁矿及贫赤铁矿对重金属污染沉积物中Cu或Zn的固定化可行性.结果表明,铁氧化物掺杂后沉积物吸持Cu的能力明显下降,但吸持Zn的能力显著增加,尤其是针铁矿和赤铁矿的作用效果稳定.因此,4种铁氧化物中针铁矿和赤铁矿具有稳定固定污染沉积物中Zn的潜力,但不能提高污染沉积物吸附Cu的能力.

The feasibility of 4 iron oxides including goethite, hematite, ferrihydrite and lean hematite to immobilize heavy metals in the polluted sediments was analyzed by investigating the adsorption capacities of the iron oxides, the change of adsorption characteristics of the sediments after the introduction of the iron oxides into the sediments. The results indicate that the introduction of the iron oxides reduced the adsorption capacity of Cu onto the sediments, but increased the adsorption capacity of Zn onto the sediments, especially after the introduction of hematite and goethite. So, the hematite and goethite were recognized as the most suitable materials for stabilizing and immobilizing Zn in the polluted sediments.