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本文运用表面络合模式,研究了江西乐安江下游黄龙庙沉积物的吸附特性,测定了样品对重金属CU(Ⅱ),Cd(Ⅱ)的吸附等温线和pH吸附突跃曲线;应用FITEQL程序计算了沉积物的表面固有吸附常数;对恒定容量模式、扩散层模式和三层模式在天然水体沉积物中的应用进行了比较.结果表明,应用表面络合模式研究天然水体沉积物的吸附特性是可行的,三种模式对重金属CU(Ⅱ),Cd(Ⅱ)在沉积物表面的吸附行为都有较好的预测性;有机物是影响金属离子吸附的一个重要因素.
In this paper, the adsorption characteristics of Huanglongmiao sediment in the lower reaches of Le’an River in Jiangxi Province were studied by using surface complexation model. The adsorption isotherms and pH adsorption abrupt curves of heavy metals (Cu (Ⅱ) and Cd (Ⅱ)) were measured and calculated using FITEQL program The intrinsic adsorption constants of sediments were compared.The application of constant volumetric model, diffusion model and three-layer model in sediments of natural water were compared.The results showed that the adsorption characteristics of natural water sediments by surface complexation model were Feasible, the three models have good predictability for the adsorption behavior of heavy metals Cu (Ⅱ) and Cd (Ⅱ) on the surface of sediments; organic matter is an important factor affecting the adsorption of metal ions.