TiO2-Fe3O4-ATP吸附剂对P(V)的吸附动力学和热力学  

Adsorption Kinetics and Thermodynamics of TiO-FeO-ATP Adsorbent to P(V)

作　　者：刘彪 杨净 薛田田 苏可心 LIU Biao;YANG Jing;XUE Tian-tian;SU Ke-xin(Faculty of Geomatics,Lanzhou Jiaotong University,Lanzhou 730070,China;National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring,Lanzhou 730070,China;Gansu Provincial Engineering Laboratory for National Geographic State Monitoring,Lanzhou 730070,China)

机构地区：[1]兰州交通大学测绘与地理信息学院,甘肃兰州730070 [2]地理国情检测技术应用国家地方工程研究中心,甘肃兰州730070 [3]甘肃省地理国情检测工程实验室,甘肃兰州730070

出　　处：《材料保护》2020年第8期68-73,共6页Materials Protection

基　　金：兰州交通大学优秀平台支持(201806)资助。

摘　　要：为提高凹凸棒黏土的吸附能力,将凹凸棒黏土负载纳米二氧化钛制成复合吸附剂,通过TiO2-Fe3O4-ATP吸附剂对P(V)的静态吸附试验,对其动力学特征、吸附平衡和热力学参数进行了研究,探讨了其吸附机理。结果表明:复合吸附剂对P(V)有良好的吸附作用,吸附过程可用准二级反应动力学模型描述,吸附过程主要受颗粒扩散(PDC)和化学反应(CRD)两方面控制。吸附类型符合Freundlich吸附模型,吸附热力学参数ΔG为-1.83^-0.92 kJ/mol,ΔS=-45.89 kJ/mol,ΔH=-15.18 kJ/mol,吸附是自发、熵减、放热的过程。For improving the adsorption capacity of attapulgite,the composite absorbent was fabricated with attapulgite loaded with TiO2 nanoparticles. The static adsorption experiment of P(V) was carried out by TiO2-Fe3O4-ATP adsorbent. The kinetic characteristics,adsorption equilibrium and thermodynamic parameters were studied systematically,and the adsorption mechanism was discussed further. Results showed that the composite adsorbent had a good adsorption effect on P(V),and the adsorption process could be described by quasi-second-order reaction kinetic model,which was mainly controlled by particle diffusion(PDC) and chemical reaction(CRD). Moreover,the adsorption type was in accordance with the Freundlich adsorption model,and the adsorption thermodynamics parameters of which were ΔG =-1. 83 ^-0. 92 kJ/mol,ΔS =-45.89 kJ/mol,ΔH =-15.18 kJ/mol,and the adsorption was a spontaneous,entropy-reduction and exothermic process.

关 键 词：凹凸棒黏土 纳米二氧化钛 P(V) 吸附 动力学 热力学 

分 类 号：TM277[一般工业技术—材料科学与工程]