褐煤腐殖酸对铵的吸附特性研究

研究了铵浓度、处理时间及介质pH对2种褐煤腐殖酸吸附铵的影响及其规律。结果表明,褐煤腐殖酸对铵的吸附等温式可用Freundlich等温曲线描述,其动力学吸附方程用Elovich方程描述最佳。在pH7.04时,介质pH的升高有利于铵的吸附。当pH4.03时,主要以物理吸附为主;当4.03.

Characteristics of adsorption of NH+4 on humic acid extracted from brown coal

Low N use efficiency and high environmental risk of chemical N fertilizer are worldwide concern, which may be overcome by using new slow-release fertilizers. Purpose of this research was offering basic data for the production of humic acid slow-release fertilizers. The effects of NH~ _4concentration, equilibrium time and pH value on the NH~ _4 (adsorption) of humic acid extracted from Shanxi brown coal and its absorptive regularity were studied by ion-exchange (equilibrium) method in this paper. The characteristics of isothermal adsorption and kinetics adsorption on humic acid was discussed too. Results showed that with the increase of NH~ _4concentration, adsorption capacity of NH~ _4 increased. The (adsorption) of NH~ _4on humic acid could be well described by Freundlich equation and its kinetics adsorption fit Elovich (equations) best. Under the condition of pH lower than 7.04, pH increase of medium was of great advantage of NH~ _4 adsorption and could improve the velocity of adsorption reaction. Under the condition of pH lower than 4.03, physical adsorption was the dominant. However, under the condition of 4.03