铝基锂吸附剂制备及其吸附性能研究

doi:10.11962/1006-4990.2019-0499

Abstract

Abstract:

Aluminum-based lithium adsorbent[LiCl·2Al（OH）₃·nH₂O] was synthesized with LiCl and anhydrous AlCl₃ as raw materials by one-step method,and the reaction conditions was optimized by orthogonal experiment.The effects of adsorption time,adsorption temperature,initial pH and initial Li⁺ concentration on adsorption performance were investigated.The inorganic aluminum adsorption materials were characterized before and after adsorption.The selectivity of ion adsorption and stability of adsorbent were also discussed.The results showed that the optimum adsorption condition was 2 h in lithium solution with pH=7 at 45 ℃,and the adsorption capacity reached 8.66 mg/g.The results of XRD and FT-IR showed that the adsorbent material had good stability.The Li⁺ distribution coefficient of adsorbent（K=10.06） was much higher than that of other metalcations.After 5 cycles of adsorption,the adsorption capacity of the adsorbent can still maintain 91.5% of original value.And the lithium adsorption amount in Tibet Longmucuo brine reached 5.24 mg/g.The fitting results of adsorption equilibrium data showed that the adsorption of Al-based lithium adsorbent conforms to the Langmuir isothermal adsorption model,and the adsorption belongs to single layer adsorption which occurred on the surface of the adsorbent.The adsorption process accords with pseudo-second-order kinetics equation,which is a typical chemical adsorption process.

Key words: aluminum hydroxide, adsorbent, lithium ion, selectivity

CLC Number:

TQ131.1

Tang Na,Gong Jingkuan,Xiang Jun. Preparation and adsorption properties of aluminum-based lithium adsorbent[J]. Inorganic Chemicals Industry, 2020, 52(8): 51-56.

Figures/Tables 15

References 10

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密度/ （g·cm^-3）	ρ（CO₃^2-）/ （mg·L^-1）	ρ（B₂O₃）/ （mg·L^-1）	ρ（K⁺）/ （mg·L^-1）	ρ（SO₄^2-）/ （mg·L^-1）
1.097	73	615	3 524	5 927
ρ（Ca²⁺）/ （mg·L^-1）	ρ（Cl^-）/ （mg·L^-1）	ρ（Mg²⁺）/ （mg·L^-1）	ρ（Li⁺）/ （mg·L^-1）
862	83 196	11 424	130

水平	因素
水平	A 终点pH	B n（Al）/n（Li）	C NaOH滴加速率/ （mL·min^-1）	D 反应温度/℃
1	4	1.00∶1	2	55
2	5	1.25∶1	3	65
3	6	1.50∶1	4	75
4	7	1.75∶1	5	85

水平	因素					吸附量/ （mg·g^-1）
水平	A	空	B	C	D	吸附量/ （mg·g^-1）
1	1	1	1	1	1	6.14
2	1	2	2	2	2	6.82
3	1	3	3	3	3	6.32
4	1	4	4	4	4	6.65
5	2	1	2	4	4	7.30
6	2	2	1	3	3	6.20
7	2	3	4	1	2	6.66
8	2	4	3	2	1	6.43
9	3	1	3	4	2	7.27
10	3	2	4	3	1	7.41
11	3	3	1	2	4	7.49
12	3	4	2	1	3	8.18
13	4	1	4	2	3	6.43
14	4	2	3	1	4	4.99
15	4	3	2	4	1	8.21
16	4	4	1	3	2	7.90
K₁	6.48	6.78	6.91	6.49	7.05
K₂	6.65	6.35	7.63	6.80	7.16
K₃	7.59	7.17	6.25	7.23	6.78
K₄	6.88	7.29	6.80	7.07	6.61
R	4.42	3.75	5.49	2.97	2.22

金属离子	ρ₀ /（mg·L^-1）	ρ_e /（mg·L^-1）	Q_e /（mg·g^-1）	K	α
Li⁺	11.70	8.73	8.78	10.06	1.00
Na⁺	693.71	693.47	0.71	0.01	972.11
K⁺	50.87	50.76	0.30	0.05	193.67
Ca²⁺	17.49	17.42	0.20	0.09	98.59
Mg²⁺	24.37	24.21	0.51	0.14	77.82

Langmuir模型			Freundlich模型
K_L /（g·L^-1）	Q_m /（mg·g^-1）	R²	K_F	n	R²
11.04	16.94	0.975 1	3.84	2.91	0.924 5

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Inorganic Acid-Base-Salt Committee of CIESC

Preparation and adsorption properties of aluminum-based lithium adsorbent

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伪一级动力学			伪二级动力学
K₁ / （h^-1）	Q_e / （mg·g^-1）	R²	K₂/ （g·mg^-1·h^-1）	Q_e / （mg·g^-1）	R²
0.96	3.31	0.778 8	0.61	8.18	0.991 2

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