Abstract The sorption isotherm and sorption kinetics of NH4+ by the Fen River reservoir sediment were investigated for a better understanding of the NH4+ sorption characteristics and parameters. The results showed that Q (adsorption content) increased with the increase of Ceq (equilibrium concentration), sorption isotherms could be described by Freundlich equation (R2 from 0.97 to 0.99). Cation exchange capacity (CEC) had a significant correlation with the parameters K and n (R2 was 0.85 and 0.95, respectively). The ENC0 (Ceq as Q was zero) of S1, S2, S3 and S4 was 1.25, 0.57, 1.15 and 1.14 mg L-1, respectively, and they were less than the NH4+ concentrations in reservoir water. The sediments released NH4+ to the Fen River reservoir water and acted as a pollution source, in the form of complex and heterogeneous adsorbents. The NH4+ adsorption kinetic process was composed of ‘fast’ and ‘slow’ reaction patterns and could be fitted using both Elovich equation and Pseudo second-equation. More than one-step may be involved in the NH4+ sorption processes, and interior diffusion was not dominant ion action.

中文翻译：

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饮用水水库沉积物对NH4+的吸附和吸附动力学

摘要 为了更好地了解NH4+的吸附特性和参数，研究了汾河水库沉积物对NH4+的吸附等温线和吸附动力学。结果表明，Q（吸附量）随着Ceq（平衡浓度）的增加而增加，吸附等温线可以用Freundlich方程描述（R2从0.97到0.99）。阳离子交换容量 (CEC) 与参数 K 和 n 显着相关（R2 分别为 0.85 和 0.95）。S1、S2、S3 和 S4 的 ENC0（Ceq 为 Q 为零）分别为 1.25、0.57、1.15 和 1.14 mg L-1，它们低于水库水中 NH4+ 的浓度。沉积物以复杂和异质吸附剂的形式向汾河水库水释放 NH4+，并成为污染源。NH4+ 吸附动力学过程由“快”和“慢”反应模式组成，可以使用 Elovich 方程和伪二次方程拟合。NH4+ 吸附过程可能涉及多个步骤，并且内部扩散不是主要的离子作用。