膨润土改性偏钛酸型钛锂离子筛及吸附性能研究

doi:10.11896/cldb.22030244

材料导报

2023, Vol. 37

Issue (19): 22030244-7 https://doi.org/10.11896/cldb.22030244

无机非金属及其复合材料

膨润土改性偏钛酸型钛锂离子筛及吸附性能研究

张理元^1,2,3,*, 李燕¹, 税亿¹, 张菁菁¹, 吴娜¹, 阳金菊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

Bentonite Modified Metatitanate Titanium-Lithium Ion Sieve and Its Adsorption Performance

ZHANG Liyuan^1,2,3,*, LI Yan¹, SHUI Yi¹, ZHANG Jingjing¹, WU Na¹, YANG Jinju¹

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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摘要以硫酸钛为钛源,乙酸锂为锂源,膨润土为改性剂,采用无机沉淀胶溶法制备了偏钛酸型锂离子筛前驱体,经盐酸洗脱后,得到膨润土改性的偏钛酸型锂离子筛,研究了其吸附性能。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,膨润土改性后,样品呈现出介孔结构,50 ℃时,用0.2 mol/L盐酸洗脱6 h,该样品的Li⁺洗脱率达到99.85%,在25 ℃下,对Li⁺溶度为2 g/L的LiOH溶液吸附24 h,改性锂离子筛对Li⁺的吸附容量达到45.49 mg/g,与未改性样品的吸附容量30.62 mg/g相比,有明显提升。改性后的Li₂TiO₃中存在Si-O四面体层,有部分Li进入Si-O四面体空隙中。吸附动力学过程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: 无机沉淀胶溶法钛锂离子筛膨润土酸洗吸附

Abstract: The precursor of metatitanic acid lithium ion sieve was prepared by inorganic precipitation gel solution method with titanium sulfate as titanium source, lithium acetate as lithium source and bentonite as modifier. After elution with hydrochloric acid, the metatitanic acid lithium ion sieve modified by bentonite was obtained, and its adsorption performance was studied. The surface morphology, crystal phase composition, specific surface area and pore structure, element content and valence of the samples were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), and surface area analyzer (BET) and X-ray photoelectron spectrometer (XPS), respectively. The results show that, after bentonite modification, a mesoporous structure is observed in the sample, the elution rate of achieves 99.85% by pickling the sample with 0.2 mol/L hydrochloric acid at 50 ℃ for 6 h. The adsorption capacity of lithium ion sieve modified by bentonite reaches 45.49 mg/g in LiOH solution with a Li⁺concentration of 2 g/L at 25 ℃ for 24 h, which is significantly higher than that of the unmodified sample (30.62 mg/g). A Si-O tetrahedral layer is existed in the modified Li₂TiO₃, and part of Li enters the Si-O tetrahedral gap, resulting in the increase of the surface area and adsorption capacity of the modified sample. The adsorption kinetic process conforms to the pseudo second-order kinetic model, and the adsorption mode is chemical monolayer adsorption.

Key words: inorganic precipitation-peptization method titanium lithium ion sieve bentonite pickling adsorption

出版日期: 2023-10-10 发布日期: 2023-09-28

ZTFLH:

TB34

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,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、四川省教育厅重点项目、校级科研项目、横向项目等10余项。近几年,以第一作者发表学术论文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, 李燕, 税亿, 张菁菁, 吴娜, 阳金菊. 膨润土改性偏钛酸型钛锂离子筛及吸附性能研究[J]. 材料导报, 2023, 37(19): 22030244-7.
ZHANG Liyuan, LI Yan, SHUI Yi, ZHANG Jingjing, WU Na, YANG Jinju. Bentonite Modified Metatitanate Titanium-Lithium Ion Sieve and Its Adsorption Performance. Materials Reports, 2023, 37(19): 22030244-7.

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http://www.mater-rep.com/CN/10.11896/cldb.22030244 或 http://www.mater-rep.com/CN/Y2023/V37/I19/22030244

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