摘要
针对传统锂吸附剂普遍存在的吸附容量低、解吸能耗高等技术瓶颈,本研究创新性地采用溶胶-凝胶法制备了具有三维多孔结构的H_(2)TiO_(3)-Li复合吸附剂。以醋酸锂(CH_(3)COOLi)和钛酸四丁酯(Ti(OC_(4)H_(9))_(4))为前驱体,通过控制水解缩聚过程制备Li_(2)TiO_(3)凝胶前驱体,经650℃煅烧后获得结晶度良好的尖晶石型Li_(2)TiO_(3)。通过0.25 mol/L盐酸酸洗实现锂离子的选择性脱出,成功构建H_(2)TiO_(3)层状结构,以苯胺对Li吸附剂改性。通过X射线衍射仪(XRD)、扫描电镜(SEM)对其产物及过程产物进行表征检测,对H_(2)TiO_(3)-Li的吸附性能进行研究。研究结果表明,Li_(2)TiO_(3)的最佳锻烧温度为650℃,H_(2)TiO_(3)-Li吸附剂具有高吸附性,且吸附容量与吸附剂浓度呈正相关,苯胺改性后最大吸附容量将达到84.07 mg/g,比未改性的锂离子筛吸附容量提高了20.01%,具有良好的实际应用价值。
In response to the common technical challenges of low adsorption capacity and high desorption energy consumption in traditional lithium adsorbents,a sol-gel method was innovatively adopted to prepare a three-dimensional porous H_(2)TiO_(3)-Li composite adsorbent.Using lithium acetate(CH_(3)COOLi)and tetrabutyl titanate(Ti(OC_(4)H_(9))_(4))as precursors,Li_(2)TiO_(3)gel precursors were prepared by controlling hydrolysis and polycondensation processes.After calcination at 650℃,spinel-type Li_(2)TiO_(3)with excellent crystallinity was obtained.Selective lithium-ion extraction was achieved through 0.25 mol/L hydrochloric acid washing,successfully constructing a layered H_(2)TiO_(3)structure,followed by aniline modification of the lithium adsorbent.The products and intermediate materials were characterized by X-ray diffractometer(XRD)and scanning electron microscope(SEM),and the adsorption performance of H_(2)TiO_(3)-Li was investigated.Results demonstrated that the optimal calcination temperature for Li_(2)TiO_(3)was 650℃.The H_(2)TiO_(3)-Li adsorbent exhibited high adsorption performance,with adsorption capacity showing positive correlation with adsorbent concentration.After aniline modification,the maximum adsorption capacity reached 84.07 mg/g,representing a 20.01%improvement compared to unmodified lithium-ion sieves,indicating significant practical application value.
作者
薛卉晙熔
季娟
常思凡
薛梦
童霏
XUE Huijunrong;JI Juan;CHANG Sifan;XUE Meng;TONG Fei(Jiangsu University of Technology,Jiangsu Changzhou 213000,China)
出处
《广州化工》
2026年第2期39-42,共4页
GuangZhou Chemical Industry
基金
江苏省大学生创新创业训练项目(202411463074T)。
