长江口邻近海域沉积物对磷的吸附作用初步研究  

Preliminary Study of Phosphate Adsorption onto a Sediment from Adjacent Area in Yangtze Estuary

作　　者：陈娟娟[1] 葛成凤[1] 姬泓巍[1] 曹晓燕[1,2] 刘素美[2] 

机构地区：[1]中国海洋大学化学化工学院,山东青岛266100 [2]中国海洋大学海洋化学理论与工程技术教育部重点实验室,山东青岛266100

出　　处：《中国海洋大学学报（自然科学版）》2015年第3期79-86,共8页Periodical of Ocean University of China

基　　金：国家重点基础研究发展计划项目(2011CB409802);山东省自然科学基金项目(ZR2013DM018);海洋化学理论与工程技术教育部重点实验室(中国海洋大学)访问学者基金项目资助

摘　　要：选取长江口邻近海域的沉积物风干研磨后筛分为4个不同粒度的样品（40-80目,80-100目,120-200目及200目以下）,考察粒度及磷浓度对动力学吸附的影响,比较了处理方式、介质pH及所含腐殖酸HA对等温吸附的影响。结果发现：（1）沉积物对磷的吸附可用伪二级动力学方程描述,沉积物粒度越小、初始磷浓度越大,对磷的吸附速率越大;（2）等温吸附曲线可用Langmuir-交叉型等温式拟合,磷的吸附量随粒度减小而增加。沉积物经HCl处理之后,对磷的吸附能力增强,沉积物对磷的吸附量与介质中HA的浓度正相关,pH对沉积物吸附磷的影响较为复杂,＂稳定pH范围＂约为7-9。A sediment sample obtained from the adjacent area of Yangtze Estuary was sieved into 4 different fractions：40-80 mesh,80-100 mesh,120-200 mesh and200 mesh,after drying and grinding.The sorption kinetics and thermodynamics of phosphorus onto the sediment were investigated,including the influence of sediment treatment,pH value and humic acid（HA）in medium.The main results are as follows：（1）The sorption process could be described by pseudo-second-order kinetic rate equation and the sorption rate increased with the decreasing particle size and the increasing initial phosphorus concentration.（2）The sorption isotherms fit modified Langmuir isotherm well.The sorption capability of phosphorus on the sediments increased with the decreasing particle size and the increasing concentration of HA in natural seawater（NSW）.The sorption capability of phosphorus increased after the sediment treated by HCl.The influence of pH on the adsorption behavor was relatively complicated,the＂stability pH range＂was about 7-9.

关 键 词：沉积物 磷 吸附 

分 类 号：P734.41[天文地球—海洋化学]