【摘要】 采用静态吸附法研究了汞在腐殖酸上的吸附特性和动力学特征。结果表明,20℃以下,平衡吸附量随温度的升高而增加,20℃以上,吸附反应受温度的影响却很小。溶液的pH在5～9范围内,具有最高的吸附效率,有利于腐殖酸吸附更大量的汞。吸附过程符合伪二级吸附速率方程,吸附速率常数k2随初始浓度的增加反而减小,这与快吸附反应比例F以及到达F的时间有关。腐殖酸对汞的吸附活化能为20.37kJ/mol,说明吸附反应属于化学吸附过程。更多还原

【Abstract】 The adsorption characteristics and kinetics of humic acids(HAs) to mercury in aqueous solution was studied using static adsorbing method,and the influence of pH on adsorption capacity was also focused on. The results show that the equilibrium adsorbing amount(qe) increases whit the addition of temperature below 20℃,whereas the temperature hardly affects the sorption above 20℃ . The adsorbility is optimal in the range of pH 5～9. The adsorption process follows a pseudo second-order kinetic rate equation. With initial Hg2+ concentration increases,the rate constant k2 decreases,which is related to uptake fraction F and the time to reach F(tF). The adsorption activation energy of mercury on humic acids is 20.37kJ/mol,which indicates that it belongs to chemiadsorption.更多还原