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以黄海海洋沉积物作为研究对象,研究了Pb在沉积物上的吸附行为,探讨了pH值、时间、温度和沉积物上不同成分对吸附作用的影响,并讨论了其吸附热力学性质和吸附机理,同时还进行了解吸研究。结果表明,pH值显著影响沉积物对Pb~(2+)的吸附,pH=6.0时吸附效果最好。其动力学行为符合Lagergren准二级动力学模型。Pb(II)的吸附量随着温度的升高而升高,Langmuir和Freundlich模型均能很好拟合等温吸附试验数据。热力学分析表明,该吸附过程是自发的吸热过程。沉积物中存在的碳酸盐、氯氧化物对沉积物吸附Pb的贡献最大。沉积物中的有机质与pb~(2+)结合更加牢固,使其不容易解吸。
Taking the Yellow Sea marine sediment as the research object, the adsorption behavior of Pb on sediments was studied, and the influence of pH, time, temperature and different components on the adsorption on the adsorption was discussed. The adsorption thermodynamic properties and adsorption mechanism , While also carried out desorption studies. The results showed that the pH value significantly affected the adsorption of Pb2 + on sediment, and the best adsorption effect was obtained at pH = 6.0. Its kinetic behavior accords with Lagergren pseudo-second-order kinetic model. The adsorption capacity of Pb (II) increased with the increase of temperature. Both the Langmuir and Freundlich models fit well the isothermal adsorption data. Thermodynamic analysis shows that the adsorption process is a spontaneous endothermic process. Carbonates and oxychlorides present in the sediments contributed the most to Pb adsorption on sediments. The organic matter in the sediments is more strongly bound to Pb 2+, making it less desorbable.