摘要
以传统溶胶-凝胶法制备Li^+筛前驱体Li Mn_2O_4(LMO),并对水浴反应条件进行优化。溶液p H为6、反应时间为6 h时合成的样品结构最为稳定,掺La^(3+)后得到Li La_(0.01)Mn_(1.99)O_4(LLMO)。利用X线衍射仪(XRD)和扫描电子显微镜(SEM)研究了材料的结构和表观形貌,通过等离子体发射光谱仪(ICP)确定元素的化学状态,并对溶损率、吸附容量和重复利用率进行考察和对比。结果表明:掺La^(3+)后的LLMO对Mn^(3+)溶损率与LMO相比下降了近34%,经5次循环实验后,LLMO吸附量仍达到初始吸附量的84.32%(21.3 mg/g),高于LMO的77.37%。由此可见,掺杂La^(3+)能有效地改善溶损问题,利于离子筛的循环与再生利用,且其对盐湖卤水有较好的离子选择分离性,为稀土掺杂LMO提供了依据和方向。
LiMn 2O 4（LMO） was prepared by the traditional sol-gel method and the reaction conditions were optimized.The most stable structure was obtained when the pH of the solution was 6 and the reaction time was 6 h and then doped with La 3＋ to prepare LiLa 0.01 Mn 1.99 O 4（LLMO）.The structure and morphology of the materials were studied by X-ray diffractometer（XRD） and scanning electron microscopy（SEM）.The chemical formula of the materials were determined by inductively coupled plasma emission spectrometer（ICP）,and the dissolution loss,adsorption capacity and recycling performance were studied and compared.The dissolution loss of LLMO was decreased by nearly 34% as compared with that of LMO,and after 5 cycles,the adsorption capacity of LLMO reached 84.32%（21.3 mg/g）,which was higher than that of LMO（77.37%）.It was confirmed that La 3＋ -doping could decrease the dissolution loss effectively,which was beneficial to the reuse and recycle of the ion sieve. LLMO had a good selectivity of metal ion in brine,and provided the basis and direction for doping of rare earth in LMO.
作者
吴如云
居沈贵
WU Ruyun;JU Shengui(College of Chemical Engineering,Nanjing Tech University,Nanjing 210009,China)
出处
《南京工业大学学报（自然科学版）》
CAS
北大核心
2018年第5期35-39,59,共6页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家自然科学基金(U1407122)
江苏省创新项目(KYLX15_0796)
