Fe-P双掺杂二氧化钛复合材料的制备及其对铊的吸附研究  

Preparation of Fe-P Double Doped Titanium Dioxide Composite and its Adsorption of Thallium

作　　者：赵新亭 朱日龙[2] 祝伟康 赵笑宇 童春义[2] 邓露 李清 ZHAO Xintin;ZHU Rilong;ZHU Weikang;ZHAO Xiaoyu;TONG Chunyi;DENG Lu;LI Qing(Xinjiang Ecological Environment Monitoring Station,Urumqi Xinjiang 830000,China;Chemistry and Chemical Engineering,Changsha Hunan 410082,China;Hunan Yiyang Ecological and Environmental Monitoring Center,Yiyang Hunan 413000,China)

机构地区：[1]新疆生态环境监测总站,新疆乌鲁木齐830000 [2]湖南大学化学化工学院,湖南长沙410082 [3]湖南省益阳生态环境监测中心,湖南益阳413000

出　　处：《新疆环境保护》2023年第2期21-29,共9页Environmental Protection of Xinjiang

基　　金：湖湘高层次人才聚集工程-创新团队生态环境监测与评价技术创新团队(2021RC5030)。

摘　　要：以钛酸四丁酯为原料,利用水解法构造了Ti-O-Ti的空间结构,通过添加有机硝酸铁和磷酸氢二铵两种原料,向其空腔内引入Fe、P双元素掺杂,得到P-FeN-TiO_(2)复合材料。使用扫描电镜(SEM)观察了材料的表面形貌,通过吸附等温线、吸附动力学拟合模型分析材料对铊的吸附性能;考察不同溶液pH值、阳离子共存时对铊吸附进程的影响。结果表明:P-Fe-TiO_(2)复合材料具有多孔结构,吸附符合单分子层吸附,Langmuir拟合最大吸附容量283.1 mg/g,吸附大约2 h达到平衡,强酸性环境会抑制铊的吸附,随着pH值的升高吸附容量逐渐增大,K(Ⅰ),Na(Ⅰ)离子的存在对吸附干扰较小,Ca(Ⅱ)离子的存在会与Tl(Ⅰ)竞争有效的吸附结合位点,导致吸附效率降低,根据吸附前后材料的XPS表征分析,P-FeN-TiO_(2)复合材料对Tl(Ⅰ)的吸附机理为Ti-OH、P=O、Fe-OH三种基团与Tl(Ⅰ)发生了络合作用,从而实现铊的去除。The spatial structure of Ti-O-Ti was constructed using hydrolysis method using tetrabutyl titanate as raw material.By adding organic iron nitrate and diammonium hydrogen phosphate as raw materials,Fe and P dual element doping were introduced into its cavity to obtain P-FeN-TiO_(2) composite material.The surface morphology of the material was observed by scanning electron microscopy(SEM),and the adsorption performance of the material of thallium was analyzed by adsorption isotherms and adsorption kinetic fitting model.The effects of different solution pH and cation coexistence on the adsorption process of thallium were investigated,and the results showed that the P-Fe-TiO_(2) composite material had a porous structure and the adsorption was consistent with the adsorption of a single molecular layer.The maximumadsorption capacityfitted by Langmuir is 283.1 mg/g,and the adsorption reaches equilibrium about 2 h.The strong acidic environment would inhibit the adsorption of thallium,and the adsorption capacity would gradually increasewith the increase of pH value.while the presence of K(I)and Na(I)ions would have little interference with the adsorption,while the presence of Ca(II)ions would compete with Tl(I)for effective adsorption binding sites,resulting in lower adsorption efficiency.According to the XPS characterization of the materials before and after adsorption,the adsorption mechanism of Tl(I)by P-FeN-Tio2 composite was that three groups,Ti-OH,P=O and Fe-OH,were complexed with Tl(I),thus achieving thallium removal.

关 键 词：铊去除 钛基吸附剂 元素掺杂 络合吸附 

分 类 号：X703[环境科学与工程—环境工程] TQ424[化学工程]