化工新型材料

化工新型材料 ›› 2023, Vol. 51 ›› Issue (1) : 172-177. DOI: 10.19817/j.cnki.issn1006-3536.2023.01.033

科学研究

电纺La₂O₃纳米纤维对氟离子的吸附热力学和动力学研究

^1,2,3

^1,2,3*

作者信息 +

Study on dynamics and thermodynamic for fluoride adsorption on electrospun La₂O₃ nanofibers

Jian Shaoju^1,2,3, Cheng Yiting¹, Kang Xiaoyan¹, Hong Huifang¹, Xiao Jinyu¹, Yang Weisen^1,2,3

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文章历史 +

Received		Published
2021-10-06		2023-01-20
Issue Date	Revised Date
2023-02-02	2021-10-06

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摘要

以聚丙烯腈为模板,采用高压静电纺丝与烧结相结合制备了La₂O₃纳米纤维,采用扫描电子显微镜(SEM)、X射线衍射仪(XRD)和比表面积分析仪(BET)对La₂O₃纳米纤维进行分析。将其用作除氟剂,探讨了La₂O₃对氟离子的吸附动力学和热力学。结果表明:La₂O₃对氟离子的吸附数据遵循准二级动力学和Langmuir吸附等温模型;热力学参数吉布斯自由能(ΔG⁰)0、熵变(ΔS⁰)及焓变(ΔH⁰)均大于零,说明La₂O₃对氟离子吸附过程为多级控制的自发熵增加吸热反应。

Abstract

Using PAN as template,a novel adsorbent of electrospun La₂O₃ nanofibers was fabricated by electrospinning-calcination technology.The prepared electrospun La₂O₃ nanofibers were characterized by SEM,XRD,and BET.It was used as an adsorbent to remove fluoride in aqueous solution,and the adsorption kinetics and thermodynamics of La₂O₃ nanofibers for fluoride ions were discussed.The results showed that pseudo-second order kinetic model and Langmuir adsorption isotherm model was ideal for the adsorption date of La₂O₃ for fluoride.The thermodynamic parameters including Gibbs free energy (ΔG⁰),entropy change (ΔS⁰) and enthalpy change (ΔH⁰) affirmed that the adsorption of F^- onto the La₂O₃ nanofibers adsorbent was an endothermic reaction with multi-level control of spontaneous entropy increase.

关键词

氧化镧 / 静电纺丝 / 动力学 / 热力学 / 氟离子

Key words

La₂O₃ / electrospinning / dynamics / thermodynamic / fluoride

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电纺La₂O₃纳米纤维对氟离子的吸附热力学和动力学研究[J]. 化工新型材料, 2023, 51(1): 172-177 DOI:10.19817/j.cnki.issn1006-3536.2023.01.033

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基金资助

国家自然科学基金(51406141);福建省自然科学基金项目(2020J05220和2020J01419);福建省中青年教师教育科研项目(JAT170592和JT180551);福建省大学生创新创业训练(202110397013);福建省生态产业绿色技术重点实验室开放基金项目(WYKF2019-11)

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