镧、铈改性介孔氧化铝对氟离子的吸附

doi:10.11896/cldb.201904005

材料导报

2019, Vol. 33

Issue (4): 590-594 https://doi.org/10.11896/cldb.201904005

无机非金属及其复合材料

镧、铈改性介孔氧化铝对氟离子的吸附

刘德坤,刘航,杨柳,罗永明,韩彩芸

昆明理工大学环境科学与工程学院,昆明 650500

Adsorption of Fluoride on Lanthanum or Cerium Modified Mesoporous Alumina

LIU Dekun, LIU Hang, YANG Liu, LUO Yongming, HAN Caiyun

Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650500

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摘要以La、Ce为改性物负载至其他载体表面作为高效除氟吸附剂已经受到广泛的关注。但是将La和Ce负载到介孔氧化铝(MA)却少见报道。本研究制备了La和Ce改性介孔氧化铝并将其用于氟的去除。采用N₂吸脱附等温线、X射线衍射(XRD)、傅里叶红外光谱(FTIR)对该吸附剂的结构性质进行了表征。同时,考察了吸附剂接触时间、初始浓度和溶液pH等吸附条件对氟离子吸附效果的影响。结果表明,反应在150 min 时达到吸附平衡,此时La/MA的氟去除率达92.2%,吸附氟容量大小为La/MA＞Ce/MA＞MA;氟吸附量随初始浓度的增大而增大;在pH值为5~9时,除氟效果较好;吸附等温线方程均符合Langmuir等温吸附模型;La/MA的氟离子最大吸附容量为27.9 mg/g;共存阴离子对氟吸附的影响程度为CO₃^2-＞SO₄^2-＞NO₃^-＞Cl^-。最后比较了吸附前后的FTIR,可以看出La/MA对氟离子去除效果最佳。

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关键词: 介孔氧化铝改性镧铈氟吸附

Abstract: Nowadays, a kind of highly efficient fluoride adsorbent has that employ La, Ce as the modifier to the surface of certain carriers has aroused wide concerns. However, the loading of La and Ce into mesoporous alumina(MA) is rarely reported. In this study, La and Ce modified mesoporous alumina were prepared they were used for the removal of fluorine. The structural properties of the adsorbent were characterized by N₂ desorption isotherm, X-ray diffraction(XRD) and Fourier transform infrared spectroscopy(FTIR). Furthermore, the effects of contact time, initial concentration and pH value on the adsorption of fluoride were investigated. The results showed that the adsorption equilibrium had been achieved at 150 min, with the fluorine removal rate of 92.2%(La/MA). The order of fluorine adsorption capacity was La/MA>Ce/MA>MA. The fluorine adsorption capacity increased with the increase of initial concentration. Satisfactory fluorine removal effect could be acquired under the pH value of 5—9. The adsorption isotherm equation was in accordance with the Langmuir adsorption isotherm model. The La/MA exhibited a maximum adsorption capacity of 27.9 mg/g. The degree of influence of co-existing anions on fluoride removal followed the order of CO₃^2-＞SO₄^2-＞NO₃^-＞Cl^-. Finally, by comparing the FTIR before and after adsorption, it could be seen that La/MA exerted the best effect on fluoride removal.

Key words: mesoporous alumina modified lanthanum cerium fluoride adsorption

出版日期: 2019-02-25 发布日期: 2019-03-11

ZTFLH:

TB331

基金资助: 国家自然科学基金(21507051;21767016;U1402233)

作者简介: 刘德坤,就读于昆明理工大学环境科学与工程学院,是一名在读硕士研究生,主要从事环境功能材料的合成及应用研究。韩彩芸,昆明理工大学环境科学与工程学院,副教授。目前重点研究环境功能材料的合成及其应用。

引用本文:

刘德坤, 刘航, 杨柳, 罗永明, 韩彩芸. 镧、铈改性介孔氧化铝对氟离子的吸附[J]. 材料导报, 2019, 33(4): 590-594.
LIU Dekun, LIU Hang, YANG Liu, LUO Yongming, HAN Caiyun. Adsorption of Fluoride on Lanthanum or Cerium Modified Mesoporous Alumina. Materials Reports, 2019, 33(4): 590-594.

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http://www.mater-rep.com/CN/10.11896/cldb.201904005 或 http://www.mater-rep.com/CN/Y2019/V33/I4/590

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