黄河上游沉积物在不同pH值下对磷酸盐的吸附特征  

The Sorption Characteristic of Phosphate onto Sediments from the Upper Reaches of the Yellow River in Different pH

作　　者：刘培怡[1] 马钦[1] 李北罡[1] 

机构地区：[1]内蒙古师范大学化学与环境科学学院,内蒙古呼和浩特010022

出　　处：《内蒙古石油化工》2011年第14期1-4,共4页Inner Mongolia Petrochemical Industry

基　　金：国家自然科学基金项目(20467002);内蒙古自然科学基金项目(200711020214);内蒙古师范大学科研基金项目(ZRYB08019)

摘　　要：研究了黄河上游10个不同表层沉积物在不同pH下对磷酸盐(P)的吸附动力学和吸附热力学的影响,并分别采用了不同的等温吸附模型对实验数据进行了拟合,比较了各自的适用性。结果表明:1沉积物对P的吸附量随时间增长而增大,在48h基本达到吸附平衡,不同沉积物具有相同变化趋势,但吸附能力有明显差异。2不同沉积物在不同pH值下对P的等温吸附具有相同的线性变化趋势,但吸附容量随沉积物不同而异,其中8个沉积物对P的吸附量在接近中性时最大,随pH值增大或减小均表现为下降,且变化幅度均随沉积物不同而异;而其余两样品的吸附量在pH为9.0时最大,pH为6.0时最小。3不同pH条件下,沉积物对P的吸附行为很好地符合线性方程和Freundlich模型,同时对Lang-muir模型也具有较好地拟合效果。The influence on adsorption kinetics and adsorption thermodynamics of phosphate onto ten different sediments from the Upper Reaches of the Yellow River in different pH values were studied,and different fitting equations were adopted to describe the sorption isotherms,then their applicabilities were analyzed and compared.The results indicates：（1）The amount of phosphate adsorption onto sediments increased with time pass,then 48h attached balance,the various sediments had the same tendency,but there were obvious differences.（2）The sorption isotherms of phosphate onto different sediments in different pH had the same trend and accorded with linear equation,but the absorption amount of phosphate existed certain divergence for different sediments.It was biggest near neutral condition in eight different sediments,and was descended in acid and alkaline conditions,the biggest value and descending extent all changed with the difference of sediments;but the biggest one of the rest was at pH=9.0 and the least one was at pH=6.0.（3）In different pH,the linear equation and linear fitting of Freundlich model were better applied to describe the sorption isotherms,and the applicability of Langmuir equation also had good simulated effect.

关 键 词：黄河 表层沉积物 磷酸盐 吸附等温线 PH 

分 类 号：X131.2[环境科学与工程—环境科学]