铁锰复合氧化物包覆海砂的吸附除磷研究  

Adsorptive removal of phosphate from water using Fe-Mn binary oxide coated sea sand

作　　者：李海宁[1] 陈静[2] 李秋梅[3] 凤翔[4] 王卓[1] 张高生[2] 

机构地区：[1]烟台大学环境与材料工程学院,烟台264005 [2]中国科学院烟台海岸带研究所,中国科学院海岸带环境过程与生态修复重点实验室,山东省海岸带环境工程技术研究中心,烟台264003 [3]烟台大学海洋学院,烟台264005 [4]中国农业大学(烟台)海洋学院,烟台264670

出　　处：《环境科学学报》2016年第3期880-886,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.51478457);江苏省环境功能材料重点实验室开放基金项目(No.SJHG1312)~~

摘　　要：利用铁锰复合氧化物包覆海砂制备了一种用于污水除磷的新型颗粒状吸附剂,并对其表面特性与磷吸附行为进行了研究.扫描电镜（SEM）分析结果表明,包覆后海砂颗粒表面凹凸不平且多孔,BET比表面积由0.06增至2.52 m2·g^-1.磷吸附实验结果表明,包覆后海砂对磷的吸附能力显著提高,最大吸附容量为1.01-1.23 mg·g^-1,优于多数文献报道的负载改性砂颗粒吸附剂;吸附动力学更符合准二级动力学方程,推测磷在包覆海砂表面发生了化学吸附;溶液p H对磷吸附有一定影响,离子强度则影响不大;共存阴离子对磷吸附影响的大小顺序为Si O23^-〉CO3^2-〉F^-〉SO4^2-〉Cl^-.In order to effectively remove phosphate from wastewater,a novel granular adsorbent was prepared by coating Fe-Mn binary oxide onto the surface of sea sand and was characterized using multiple techniques. The SEM image indicated the coated sea sand surface was rough and porous. The specific surface area of the sea sand was increased from 0.06 to 2.52 m2·g^-1after coating. The adsorption behavior of phosphate was also investigated with batch sorption experiments and the results show that the coated sea sand was more effective for phosphate removal,with a maximal phosphate adsorption capacity of 1.01 - 1.23 mg·g^-1,which outperformed the majority of coated sands reported in literature. The adsorption curve was better fitted by pseudosecond order model than pseudo-first order model,indicating a chemical adsorption occurred. The phosphate adsorption depended on solution p H,while ionic strength had little effect. The effects of coexisting anions on phosphate adsorption decreased in the order of Si O3^2-〉CO3^2- 〉F^-〉SO4^2- 〉Cl^-.

关 键 词：颗粒吸附剂 铁锰复合氧化物 海砂 包覆 磷 

分 类 号：X703[环境科学与工程—环境工程]