镍掺杂构建结构稳定和高吸附容量铝系吸附剂的研究

doi:10.19964/j.issn.1006-4990.2024-0516

Abstract

Abstract:

Among various strategies，lithium-aluminum layered double hydroxides（Li/Al-LDHs，hereinafter referred to as LDHs） are regarded as one of the most promising adsorbents for efficient lithium extraction from salt lake brines.However，the application of LDHs is hindered by their susceptibility to excessive Li⁺ desorption during the desorption process，which leads to structural collapse，inactivation，and an actual adsorption capacity that is significantly lower than the theoretical value.To address these limitations，a strategy was proposed to enhance the stability，selectivity，and adsorption capacity of LDHs through a one-pot synthesis method incorporating Ni（NO₃）₂doping modification.By partially replacing Al sites in the LDHs framework with Ni，the affinity for Li⁺ was improved while reducing the affinity for competing metal ions.The effect of varying aging times on the performance of Ni-LDHs-NO₃ was also investigated.The results revealed that Ni-LDHs-NO₃ synthesized with an aging time of 10 min achieved an adsorption capacity of 9.18 mg/g in a 300 mg/L LiCl solution，significantly surpassing traditional LDHs（4.51 mg/g）.The adsorption rate was substantially improved，reaching equilibrium within 100 min.Notably，the separation factors for Li⁺/Na⁺，Li⁺/Mg²⁺，and Li⁺/K⁺ were 339.59，566.15，and 108.52，respectively，highlighting that Ni doping effectively modified the material′s ion affinity and enhanced its adsorption kinetics.Moreover，the adsorbent retained 89.27% of its initial capacity after 10 adsorption-desorption cycles，demonstrating remarkable cyclic stability.These findings underscored the potential of Ni-LDHs-NO₃ as a high-performance adsorbent for Li⁺ extraction from brines.

Key words: adsorbents, doping engineering, crystal structure, structural stability, lithium aluminum double layered hydroxide

CLC Number:

TQ424

LI Xuequn, HUO Junjie, LUO Wentian, HE Wanghai, SUN Hongbo, YU Xudong, HAI Chunxi, ZHOU Yuan, ZENG Ying. Study on nickel doping to construct structurally stable and high adsorption capacity aluminum-based adsorbents[J]. Inorganic Chemicals Industry, 2025, 57(10): 32-40.

Figures/Tables 14

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Table 1

Fig.7

Fig.8

Table 2

Fig.9

Table 3

Adsorption selectivity of Ni-LDHs-NO3-10 min for different metal ions"

离子	C₀/（mg·L^-1）	C_e/（mg·L^-1）	Q_e/（mg·g^-1）	K_d/（mL·g^-1）	$α M e L i$
Li⁺	275.2	229.2	9.20	40.140 0	1.00
Na⁺	338.6	338.4	0.04	0.118 2	339.59
Mg²⁺	281.9	281.8	0.02	0.070 9	566.15
K⁺	325.0	324.4	0.12	0.369 9	108.52

Table 3

Fig.10

Table 4

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吸附剂	Q_e/ （mg·g^-1）	准一级动力学
吸附剂	Q_e/ （mg·g^-1）	q_e1/ （mg·g^-1）	k₁/min^-1	R²	残差平方和	q_e2/ （mg·g^-1）	k₂/ （g·mg^-1·min^-1）	R²	残差平方和
Ni-LDHs-NO₃-10 min	9.18	0.491	0.010	0.085	1.947	7.833	0.042	0.998	0.136
Ni-LDHs-NO₃-30 min	4.32	3.441	0.030	0.785	1.395	5.646	0.004	0.997	0.487
Ni-LDHs-NO₃-60 min	1.16	0.824	0.017	0.742	0.550	-1.35	0.020	0.260	5 376.993

吸附剂	最大吸附容量/（mg·g^-1）	吸附条件
Li/Al-LDH^［16］	7.12	察尔汗老卤，399 mg/L
MLDHs^［19］	5.83	察尔汗老卤，399 mg/L
LiZnAl-LDH-5％^［33］	7.00	罗布泊卤水，222.2 mg/L
Fe₃O₄@LiAl-LDH^［38］	6.39	察尔汗老卤，399 mg/L
LiAl-LDH^［46］	5.69	真实卤水，350 mg/L
Li-Al-Fe-Cl LDH^［47］	11.30	模拟卤水，800 mg/L
Ni-LDHs-NO₃-10 min	9.18	模拟锂溶液，300 mg/L

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Inorganic Acid-Base-Salt Committee of CIESC

Study on nickel doping to construct structurally stable and high adsorption capacity aluminum-based adsorbents

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