氟在库水与库底沉积物之间的作用过程及机理

库底沉积物在控制库水中污染物氟的归趋及其有效性中起关键作用,为揭示其作用过程和机理,采用动力学试验与静态吸附试验,并结合伪二级动力学方程、等温吸附方程,探讨了三泉水库库水与库底沉积物之间氟的作用过程。结果表明,氟离子在库底沉积物上可能以化学反应控制的动力学过程为主,拟合得出伪二级动力学方程表达式为t/qt=0.740 1t+0.126 6,相关系数R2=0.998 5;库底沉积物对F-的吸附等温线符合线性关系,拟合方程为Qe=0.004 7Ce+0.011 5,相关决定系数R2达到0.99,F-的饱和吸附量为30.56mg/g;环境(pH值)和沉积物吸附过程中溶液共存离子对F-吸附有着不同程度的影响,初始溶液pH值、共存离子Fe、Mn和SO2-4大体趋势呈正相关,Mg2+、Ca2+呈负相关。

Study on Action Process and Mechanism of Fluorine between Reservoir Water and Bottom Sediments

The surface sediments in the control of pollutants in surface water fluoride fate plays a key role and effectiveness. To reveal the process and mechanism, the dynamic test and the adsorption and desorption experiment were used to simulate the action process between Sanquan reservoir sediment and reservoir water fluoride by combining with the pseudo two order kinetics equation, isothermal adsorption equation. The results show that by fluorine ion dynamics in the process of chemical reaction control in surface sediments, can be described by the pseudo two order kinetics equation, the fitting equation is t/qt= 0.740 1t + 0.126 6, the correlation coefficient R2=0.998 5; The linear adsorption isotherm of F- in surface sediments, the regression equation is Qe=0.004 7Ce+0.011 5 that decision coefficient of R2 reached 0.99, the saturated adsorption amount of F- in the sediments is 30.56 mg/g; Environment (pH) and the coexisting ions in the sediment adsorption system have different impacts on the F- adsorption. The initial solution pH, coexisting ions Fe, Mn and SO2-4 have a positive correlation on the whole, and Mg2+ and Ca2+ are negatively correlated.