象山港沉积物对重金属Fe和Mn的吸附特征

对象山港不同站点的沉积物对重金属铁、锰的吸附特征进行了研究,考察了阳离子交换量、有机质含量对铁、锰的吸附能力的影响。吸附动力学实验表明,沉积物对铜和锌的吸附量随着铁、锰的初始含量增加而增大,但分别都在40 min和30 min左右达到吸附平衡;热力学实验结果表明,不同沉积物对铁、锰的热力学吸附过程符合Freundlich等温方程,各站点沉积物对铁的吸附能力由强到弱依次是S02,S25,S17,S10,S12,D03,D08,各站点沉积物对锰的吸附能力由强到弱依次是S02,S25,S17,S12,S10,D03,D08;影响因素实验表明,有机质的含量是影响沉积物对重金属铁吸附能力的主要影响因素之一,而沉积物对锰的吸附能力与阳离子交换量存在一定的关联性,有机质的含量几乎不影响沉积物对锰的吸附能力。因此,沉积物对重金属铁、锰的吸附系数K并不与其中单个理化性质有明显的相关性,这说明沉积物对铁、锰的吸附强度受多种沉积物理化性质控制。

The Adsorption Characteristics of Sediment on Fe and Mn at Xiangshan Harbor

A different site of the Xiangshan port of heavy metals in the sediment of iron and manganese adsorption characteristics were studied.Investigated the influence in physical and chemical properties of iron,manganese adsorption capacity both of cation exchange capacity and organic matter content.Adsorption kinetics experiments showed that the sediment of copper and zinc adsorbed dose increased with increasing initial concentration of Fe and Mn,but respectively,around 40 and 30 minutes to reach the adsorption equilibrium.The results of thermodynamics experiment showed that different sediment of iron,manganese thermodynamic process corresponsed with the freundlich adsorption isotherm equation,strong or weak adsorption capacity of iron in all site sediments followed by S02,S25,S17,S10,S12,D03,D08,the site sediments on the adsorption ability of manganese followed by S02,S25,S17,S12,S10,D03,D08.The impact of factors experiments show that the adsorption capacity of heavy metals in sediments did not have a linear relationship with iron and cation exchange capacity,relatively had a large relationship with organic matter.That is that the content of organic matter is the one of the main factors which impact the iron adsorption capacity in sediment.Sediment adsorption capacity of the manganese had a certain relevance with cation exchange capacity,and the organic matter content of the sediments have little impact on the adsorption capacity of manganese.Therefore sediment and iron,manganese adsorption coefficient K did not have a relationship with a single physical and chemical properties,which showed that the iron and manganese adsorption controlled by a variety of physical and chemical properties of sediments.At the same time,other factors such as sediments particle size,pH value,conductivity and so on,which had a impact on the iron and manganese adorption should have a further study.