工业膨胀蛭石对水体中磷的去除研究  

A study of phosphorus adsorption of industrial expanded vermiculite

作　　者：金诗迪 秦文莉[1] 夏枚生[1] 叶瑛[1] 韩兵男 

机构地区：[1]浙江大学海洋学院,浙江杭州310058 [2]上海交通大学医学院附属仁济医院,上海200127

出　　处：《岩石矿物学杂志》2014年第2期377-384,共8页Acta Petrologica et Mineralogica

基　　金：浙江大学海洋学科交叉研究引导基金(2012HY001B);浙江省舟山市科技局一般合作类项目(2012C33023);杭州湾海域;海岸带生态修复示范工程(2011918)

摘　　要：研究了工业膨胀蛭石对模拟养殖废水中磷酸盐的吸附性能,考察了pH值、吸附时间、固液比对吸附效果的影响,并通过原子吸收光谱法测定了蛭石在对磷酸盐吸附过程中主要金属元素的浸出含量,探究膨胀蛭石吸附水中磷的吸附平衡,对吸附机理进行了探讨.结果表明,工业膨胀蛭石对磷酸盐的吸附量可达2.76 mg/g,pH值在3～9的范围内有较高的吸附量;K、Ca、Mg这3种元素的浸出含量随着溶液中磷酸盐浓度升高而增加,Fe、Al元素则相应减少;工业膨胀蛭石对磷的吸附机理主要是先通过离子交换作用交换出层间阳离子,然后与H2PO4^-、HPC4^2-反应形成沉淀被吸附;吸附等温曲线均符合Freundlich公式与Langmuir公式,相关系数分别为0.978 1和0.985 1.Excess water phosphorus will cause phytoplankton blooms and result in eutrophication,so the decontamination of phosphorus becomes an urgent task in China.In this paper,adsorption of phosphorus was investigated by using industry expanded vermiculite collected in Henan Province.In this paper,phosphorus adsorption isotherm was examined,and the effects of pH value,adsorption time and dosage of vermiculite were investigated.During the agitated batch experiments,the leaching behavior of metals in vermiculite was studied and the reaction mechanism was revealed.The results show that precipitation reaction and ion exchange with iron and aluminum elements in vermiculite are the dominating mechanisms of phosphorus removal.With correlation coefficient of 0.985 1 and saturation adsorption capacity of 2.76 mg/g,Langmuir isotherm fitted the data of phosphorus adsorption on vermiculite very well.Finally,significant influence of pH value on phosphorus sorption was observed within the pH range of 3～9 in the tested sample system.

关 键 词：工业膨胀蛭石 磷酸盐吸附 PH值 金属元素 

分 类 号：X524[环境科学与工程—环境工程] P578.963[天文地球—矿物学]