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1. 天津大学化工学院, 天津 300350
2. 化学工程联合国家重点实验室(天津大学), 天津 300350
Received:06 December 2019,
Revised:2020-01-03,
Online First:14 August 2020,
Published:05 February 2020
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郭佳明, 刘明言, 吴强, 马永丽. 硝酸锂改性钛系离子筛的制备及其吸附性能[J]. 化工学报, 2020, 71(2): 879-888
GUO Jiaming, LIU Mingyan, WU Qiang, MA Yongli. Preparation and adsorption performance of titanium based lithium ion sieve improved by LiNO , 3[J]. CIESC Journal, 2020, 71(2): 879-888 DOI: 10.11949/0438-1157.20191484.
郭佳明, 刘明言, 吴强, 马永丽. 硝酸锂改性钛系离子筛的制备及其吸附性能[J]. 化工学报, 2020, 71(2): 879-888 DOI: 10.11949/0438-1157.20191484.
GUO Jiaming, LIU Mingyan, WU Qiang, MA Yongli. Preparation and adsorption performance of titanium based lithium ion sieve improved by LiNO , 3[J]. CIESC Journal, 2020, 71(2): 879-888 DOI: 10.11949/0438-1157.20191484. DOI:
钛系锂离子筛具有较高的锂吸附容量和稳定性,对其制备工艺及性能进行改进研究具有重要意义。使用硝酸锂和碳酸锂混合物作为锂源,与二氧化钛在500℃下进行固相反应,生成层状钛酸锂;使用0.2 mol·L
-1
盐酸对其酸洗24 h,得到了锂离子筛吸附剂;采用X射线衍射、扫描电镜、粒度分析、N
2
吸附-脱附方法等,对其性能进行了表征;通过锂离子的吸附实验,确定了吸附和再生性能;探究了该新型吸附剂的锂离子吸附机理。结果表明:吸附过程是单分子层化学吸附;经过改性,离子筛颗粒更加细小,孔体积和比表面积更大,结构完整;在70 mg·L
-1
的Li
+
溶液中,吸附量为25.01 mg·g
-1
,准二级吸附速率常数为0.2762 g·(mg·h)
-1
,吸附速率较之未改性提高了54.56%;该离子筛对浓度为11.6 mg·L
-1
的Li
+
溶液,其锂去除率可以达到99.77%。
Titanium based lithium ion
sieves have excellent lithium adsorption capacity and stability
and the improvement studies on its preparation and character are of great importance. A mixture of LiNO
3
and Li
2
CO
3
was used as the lithium source to synthesize laminar Li
2
TiO
3
through the solid state reaction at 500℃
and lithium ion sieves were prepared after being put it in 0.2 mol·L
-1
hydrochloric acid pickling solution for 24 h. Physicochemical properties of the ion sieves were characterized by X-ray diffraction (XRD)
scanning electronmicroscopy (SEM)
particle size distribution analysis and nitrogen adsorption-desorption measurements. Adsorption
regeneration properties of the ion sieves and adsorption mechanism were investigated. It is revealed that adsorption process conforms to the monomolecular and chemical adsorption. Furthermore
micro-scale particles with higher pore volume and higher specific area were obtained after modification. Adsorption capacity and pseudo-second-order kinetic constant of 25.01 mg·g
-1
and 0.2762 g·(mg·h)
-1
respectively
were obtained by pouring the lithium ion sieves in the solution of 70 mg·L
-1
for 24 h. Hence
the increase in adsorption rate of 54.56% was observed. The removal rate of Li
+
(99.77%) can be reached using this ion sieves in the solution of concentration of 11.6 mg·L
-1
.
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