作 者：
杨玉祥;宋可心;杨光;马晓娜;解思琦;刘子烁;冯志华
单 位：
江苏海洋大学 江苏省海洋生物资源与环境重点实验室;中国科学院深海科学与工程研究所分析测试中心
关键词：
高岭土;牡蛎壳粉;氨氮吸附;磷酸盐吸附;海水;动力学
摘 要：
为实现水中磷酸盐、氨氮的吸附去除,将牡蛎壳粉和高岭土以质量比 3∶1 比例混合,在不同条件(MgO添加量:0%、2%、4%、8%、12%;温度:0、600、700、800、900、1 000℃)下制备并筛选出吸附效果最佳的改性牡蛎壳粉,通过扫描电镜、傅里叶红外光谱仪、比表面与孔隙度分析仪和X射线衍射仪对改性牡蛎壳粉进行表征.采用动力学模型和等温吸附模型拟合吸附过程,并分析初始pH、吸附柱对改性牡蛎壳粉、磷酸盐和氨氮吸附的影响.结果表明:MgO添加量为 8%,煅烧温度为 800℃时,改性牡蛎壳粉吸附性能最佳,对磷酸盐的去除率分别为 91.7%(海水)和 82.25%(淡水),对氨氮的去除率分别为36.67%和 47.71%;改性牡蛎壳粉对磷酸盐的吸附符合准二级动力学模型和Freundlich模型,最大磷酸盐吸附量分别为 108.37(海水)、101.99(淡水)mg/g,对氨氮的吸附符合Langmuir模型,最大氨氮吸附量分别为 0.27(海水)、0.38(淡水)mg/g;酸性条件有助于磷酸盐的吸附,中性条件则更利于氨氮的吸附;在吸附柱中改性牡蛎壳粉对氨氮和磷酸盐的吸附量分别为 0.12、78.95 mg/g(海水)和 0.17、70.34 mg/g(淡水);应用其处理入海口污水中磷酸盐和氨氮,去除率分别为 96.83%、9.7%,出水达到Ⅰ类水标准.研究表明,改性牡蛎壳粉成本低,具有高效去除水中磷酸盐和氨氮的应用潜力.
译 名：
Preparation and removal effect on ammonia nitrogen and phosphates in seawater and freshwater in kaolinite-oyster shell powder modified material
关键词：
kaolinite%oyster shell powder%ammonia nitrogen adsorption%phosphate adsorption%seawater%kinet-ics
摘 要：
In order to adsorption removal of phosphate and ammonia nitrogen in water,oyster shell powder and kao-lin were mixed in the ratio of 3∶1,and the modified oyster shell powder with the best adsorption effect was pre-pared and screened out under different conditions of MgO addition of 0%,2%,4%,8%,and 12%;temperatures of 0,600,700,800,900,and 1 000℃by scanning electron microscopy,and Fourier infrared spectrometry.The characteristics of the modified oyster shell powder was analyzed by scanning electron microscope,Fourier infrared spectrometer,specific surface and porosity analyser and X-ray diffractometer.The adsorption process was fitted by kinetic model and isothermal adsorption model,and the effects of initial pH and adsorption column on the adsorp-tion of phosphate and ammonia nitrogen by modified oyster shell powder were analyzed.The results showed that the best adsorption performance of modified oyster shell powder was observed at 8%MgO addition and 800℃calcina-tion temperature,with the phosphate removal rates of 91.7%(seawater)and 82.25%(freshwater),and the am-monia nitrogen removal rates of 36.67%(seawater)and 47.71%(freshwater).The adsorption of phosphate by modi-fied oyster shell powder conformed to the quasi-secondary kinetic model and the Freundlich model,and the maxi-mum The adsorption of phosphate by modified oyster shell powder conformed to the quasi-secondary kinetic model and Freundlich model,with the maximum adsorption of 108.37(seawater)and 101.99(freshwater)mg/g,and the adsorption of ammonia nitrogen conformed to the Langmuir model,with the maximum adsorption of ammonia ni-trogen of 0.27(seawater)and 0.38(freshwater)mg/g.The adsorption of ammonia nitrogen and phosphate by the modified oyster shell powder in the adsorption columns was facilitated by the acidic conditions,and the adsorption of ammonia nitrogen was more favorable by the neutral conditions.The adsorption amounts of modified oyster shell powder on ammonia nitrogen and phosphate were found to be 0.12,78.95 mg/g(seawater)and 0.17,70.34 mg/g(freshwater)in the adsorption column.In the application in the sewage into the sea,the effluent reached the standards of a class of water with the removal rate of 96.83%for phosphate,and ammonia nitrogen for 9.7%.The findings indicate that the low cost modified oyster shell powder has the potential to be applied to remove phosphate and ammonia nitrogen from water efficiently.
