氟化对钛锂离子筛制备及性能的影响

doi:10.11896/cldb.22090255

材料导报

2024, Vol. 38

Issue (18): 22090255-8 https://doi.org/10.11896/cldb.22090255

无机非金属及其复合材料

氟化对钛锂离子筛制备及性能的影响

张理元^1,2,3,*, 张菁菁¹, 吴娜¹, 沈如倩¹

1 内江师范学院化学化工学院,四川内江 641112
2 果类废弃物资源化四川省高等学校重点实验室,四川内江 641112
3 沱江流域特色农业资源四川省科技资源共享服务平台,四川内江 641112

Effect of Fluorination on Preparation and Properties of Titanium Lithium Ion Sieve

ZHANG Liyuan^1,2,3,*, ZHANG Jingjing¹, WU Na¹, SHEN Ruqian¹

1 College of Chemistry and Chemical Engineering, Neijiang Normal University, Neijiang 641112, Sichuan,China
2 Key Laboratory of Fruit Waste Treatment and Resource Recycling of the Sichuan Provincial College, Neijiang 641112, Sichuan, China
3 Special Agricultural Resources in Tuojiang River Basin Sharing and Service Platform of Sichuan Province, Neijiang 641112, Sichuan, China

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摘要以二氧化钛为钛源,氢氧化锂为锂源,氟化铵为改性剂,采用水热法制备氟改性钛酸锂 (F-Li₂TiO₃),经盐酸洗脱得到氟化钛锂离子筛(F-H₂TiO₃)。研究氟化铵用量和煅烧温度对Li₂TiO₃前驱体形貌、晶体结构的影响以及F-Li₂TiO₃洗脱和F-H₂TiO₃吸附性能。采用扫描电子显微镜(SEM)、X 射线衍射仪(XRD)、比表面积分析仪(BET)、X 射线光电子能谱仪(XPS)分别对样品的表面形貌、晶相组成、比表面积和孔结构、元素含量和价态进行了表征分析。结果表明,氟钛比为0.15时,可以得到颗粒分散且具有多孔结构的F-Li₂TiO₃,经过700 ℃热处理的样品各晶面结晶度最完整,洗脱率达到96.98%,显著高于未改性样品(90.55%)。F-H₂TiO₃最大吸附容量达到46.52 mg/g,与未改性样品(35.51 mg/g)相比有较大提升,对Li⁺的吸附速率明显加快,吸附平衡时间从12 h缩短到10 h。F-H₂TiO₃吸附等温线符合Langmuir模型,吸附动力学符合伪二级动力学模型,吸附方式为化学单层吸附。

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	张理元
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关键词: 钛锂离子筛氟化水热法洗脱率吸附容量

Abstract: Fluoride modified lithium titanate (F-Li₂TiO₃) was prepared by hydrothermal method with titanium dioxide as titanium source, lithium hydroxide as lithium source and ammonium fluoride as modifier, followed by picking with hydrochloric acid to obtain fluoride modified titanium fluoride lithium ion sieve (F-H₂TiO₃). The effects of ammonium fluoride content and calcination temperature on the surface morphology and crystal structure of Li₂TiO₃ precursor were studied. The elution performance of F-Li₂TiO₃ and the adsorption performance of F-H₂TiO₃ were investigated. The surface morphology, crystal phase, specific surface area and pore structure, element content and valence state of the samples were characte-rized using scanning electron microscopy (SEM), X-ray diffraction (XRD), specific surface area analyzer (BET), and X-ray photoelectron spectroscopy (XPS), respectively. The results showed that F-Li₂TiO₃ with relatively dispersed particles and porous accumulation could be obtained when the fluorine titanium ratio was 0.15. The crystallinity of each crystal surface was the most complete with a calcination at 700 ℃, and the elution rate reached 96.98%, which was significantly higher than that of unmodified samples (90.55%). The maximum adsorption capacity of F-H₂TiO₃ reached 46.52 mg/g, which was greatly improved compared with 35.51 mg/g of the unmodified sample. The Li⁺ adsorption speed was significantly accelerated, and the adsorption equilibrium time was shortened from 12 h to 10 h. The adsorption isotherm conforms to the Langmuir model, the adsorption kinetics follows to pseudo second-order kinetic model, and the adsorption way is chemical monolayer adsorption.

Key words: titanium-lithium ion sieve fluorination hydrothermal process elution rate adsorption capacity

发布日期: 2024-10-12

ZTFLH:

O647.3

基金资助: 四川省科技计划(2023YFG0247);内江师范学院大学生创新项目(X2022001)

通讯作者: *张理元,通信作者,2014年12月毕业于四川大学材料学专业,获博士学位。目前为内江师范学院化学化工学院教授,主要从事无机功能材料、环境保护材料研究。主持四川省科技计划项目2项、四川省教育厅重点项目1项。近几年,以第一作者在国内外重要期刊发表核心及以上论文40余篇,其中SCI/EI收录20余篇,以第一发明人授权国家发明专利4项。zhangliyuansir@126.com

引用本文:

张理元, 张菁菁, 吴娜, 沈如倩. 氟化对钛锂离子筛制备及性能的影响[J]. 材料导报, 2024, 38(18): 22090255-8.
ZHANG Liyuan, ZHANG Jingjing, WU Na, SHEN Ruqian. Effect of Fluorination on Preparation and Properties of Titanium Lithium Ion Sieve. Materials Reports, 2024, 38(18): 22090255-8.

链接本文:

http://www.mater-rep.com/CN/10.11896/cldb.22090255 或 http://www.mater-rep.com/CN/Y2024/V38/I18/22090255

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