TiO2-Fe3O4-ATP吸附剂对P(Ⅴ)的吸附和脱附  

Adsorption and desorption of P(Ⅴ)by TiO-FeO-ATP adsorbent

作　　者：薛田田 刘洋[1] 苏可心 李静萍[1] XUE Tian-tian;LIU Yang;SU Ke-xin;LI Jing-ping(School of Chemical and Biological Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学化学与生物工程学院,甘肃兰州730070

出　　处：《应用化工》2020年第9期2252-2256,2260,共6页Applied Chemical Industry

基　　金：甘肃省自然科学基金项目(3ZX062-B25-002);甘肃省建设科技攻关项目(JK2010-31);金川公司预研基金资助项目(JCYY2013002)。

摘　　要：通过凹凸棒黏土负载TiO2-Fe3O4制备了TiO2-Fe3O4-ATP吸附剂,进行了P(Ⅴ)的静态吸附和脱附实验,对其动力学和热力学参数进行了研究。通过SEM对凹凸棒黏土负载纳米TiO2-Fe3O4前后结构进行了表征,考察了物料配比及吸附时间、pH值、温度、投加量和初始浓度对P(Ⅴ)吸附率的影响。结果表明,3/4负载TiO2-Fe3O4-ATP吸附剂对P(Ⅴ)有良好的吸附作用,当吸附剂质量为0.6 g,P(Ⅴ)离子初始浓度0.6 mg/L时,pH为8左右,温度20℃,吸附剂对P(Ⅴ)的吸附率为92.9%。吸附过程为准二级动力学,吸附类型与Freundlich吸附模型一致。TiO2-Fe3O4-ATP吸附剂在循环使用4次后,吸附率仍能达到77%以上。A TiO2-Fe3O4-ATP adsorbent was prepared by using attapulgite clay to load TiO2-Fe3O4.The static adsorption and desorption experiments of P(Ⅴ)were carried out.The attapulgite clay loaded with nano-TiO2-Fe3O4 was characterization by SEM.The front and back structures were characterized.The effects of material ratio,adsorption time,pH value,temperature,dosage and initial concentration on P(Ⅴ)adsorption rate were investigated.The results show that the 3/4 supported TiO2-Fe3O4-ATP adsorbent has a good adsorption effect on P(Ⅴ).When the adsorbent mass is 0.6 g and the initial concentration of P(Ⅴ)ion is 0.6 mg/L,the pH is about 8.At a temperature of 20℃,the adsorption rate of the adsorbent to P(Ⅴ)was 92.9%.The adsorption process is quasi-second-order kinetics,and the adsorption type is consistent with the Freundlich adsorption model.After the nano-TiO2-Fe3O4-ATP adsorbent is loaded for 4 times,the adsorption rate can still reach 77%or more.

关 键 词：凹凸棒黏土 纳米二氧化钛 P(Ⅴ) 吸附 脱附 

分 类 号：TQ170[化学工程—硅酸盐工业] O647.3[理学—物理化学]