土壤中铁氧化物对铅吸附-解吸的影响

选择上海地区广泛分布的水稻土,通过静态吸附平衡试验,比较土壤去除非晶质氧化铁和去除游离氧化铁后对Pb2+的吸附-解吸行为,采用数学模型拟合,探讨3种土壤的最佳拟合方程、最大吸附的理论值和亲和能力,进而研究非晶质氧化铁和游离氧化铁对Pb2+吸附-解吸的影响。结果表明,去除氧化铁后吸附能力和亲和能力均减弱,原土的最大吸附量为29.21 g/kg,非晶质氧化铁的贡献值为3.52 g/kg,游离氧化铁的贡献值为8.32 g/kg。

Effect of Iron Oxide on the Adsorption and Desorption of Pb in Soil

Through the static adsorption experiments on selected paddy soil distributed widely in Shanghai, the adsorption desorption of Pb by removal of amorphous iron oxide and free iron oxide were compared. According to Langmuir, Freundlich and Temkin mathematical models, the best fitting equation of 3 types of soils, the maximum adsorption theoretical value and affinity, the effect of amorphous iron oxide and free iron oxide on the adsorption desorption of Pb were studied. The results showed that adsorption capacity and affinity were weakened after iron oxide removal, the maximum adsorption capacity of the original soil was 29.21 g/kg, with the contribution value of 3.52 g/kg by amorphous iron oxide and 8.32 g/kg by free iron oxide.