改性累托石对废水中NO_3^-的吸附性能研究  

Studies on the Adsorption Performance for Nitrate Ion in Waste Water by Modified Rectorite

作　　者：徐贵钰[1] 殷海青[1] 赵延辉[2] 

机构地区：[1]青海民族大学,西宁810007 [2]青海红十字医院,西宁810000

出　　处：《四川理工学院学报（自然科学版）》2016年第4期7-11,共5页Journal of Sichuan University of Science & Engineering(Natural Science Edition)

基　　金：国家自然科学基金项目(21361021);天津大学-青海民族大学自主创新基金合作项目(2015XZ-0001)

摘　　要：累托石(REC)经过提纯,利用离子交换性使其负载季铵盐(十六烷基三甲基氯化铵,简称1631)对其进行改性,制得改性吸附剂(REC-1631),进而用Fe Cl_3·6H_2O和Fe SO_4·7H_2O对碱性条件下的吸附剂进行磁性处理,制得改性磁性累托石(Fe_3O_4/REC-1631),并对其结构进行表征,并在不同接触时间、不同浓度NO^-_3条件下对水中NO^-_3的吸附性能进行研究。实验结果表明:用季铵盐改性处理的累托石(REC)可用于废水处理,且对NO^-_3的最大吸附量由改性前的82.60 mg/g提高到102.30 mg/g,吸附效果明显增大,同时使改性累托石具有稳定的磁性,便于回收再利用,其吸附过程可以采用准二级动力学模型和Langmuir模型吸附等温线进行描述。The adsorption performance to NO^-3which from agricultural wastewater by modified rectorite has been studied.The rectorit（ REC） has been purified and modified by hexadecyl trimethyl ammonium bromide（ 1631） through using ion exchange properties,then magnetized by Fe Cl3·6H2O and Fe SO4·7 H2 O under alkaline conditions. The modified rectorite was obtained and it＇s structure was characterized,at the same time the adsorption performance of NO^-3was studied under the different conditions such as contact time,concentration of NO^-3in water and so on. The experimental results show that the rectorite was modified by hexadecyl trimethyl ammonium bromide really,it could be used to deal with the wastewater,and the maximum adsorption capacities of REC for NO^-3was only 82. 60 mg / g,while the modified REC adsorption of NO^-3increased significantly and reached 102. 30 mg / g. By this way,the adsorption effect of adsorbent was increased obviously,and it also had a stable magnetism in order to recycle easily. The adsorption process was in accord with pseudo-second order kinetics equation and Langmuir sorption isotherm equation.

关 键 词：累托石 改性 吸附 

分 类 号：TQ424.2[化学工程]