亚铁氰化铜钾复合水凝胶的制备及铷吸附研究

doi:10.19964/j.issn.1006-4990.2025-0100

Abstract

Abstract:

Rubidium，an element with important strategic value，exists in the brine of salt lakes and has not been effectively solved due to the difficulties in its separation and recovery.A novel composite hydrogel（GPP-KCuFC） for rubidium（Rb⁺） adsorption was prepared by cross-linking potassium copper ferrocyanide（KCuFC） as an effective adsorbent component with graphene oxide，polyvinyl alcohol，and pectin（GPP）.The introduction of graphene oxide enhanced the hydrophilicity of the material.The interpenetrating network hydrogel composed of polyvinyl alcohol and pectin exhibited better stability compared to the single network hydrogel.Encapsulating KCuFC within the hydrogel addressed the issues of difficult adsorbent recovery and its tendency to aggregate.Characterization techniques such as FE-SEM，XRD，FT-IR，XPS，and TGA were employed to analyze the morphology and structure of the prepared composite hydrogel，indicating that the composite hydrogel possessed abundant active adsorption sites.The effects of pH，adsorption time，initial concentration，adsorbent dosage，and competing ions on the adsorption of Rb⁺ were investigated by static adsorption experiments.The results showed that GPP-KCuFC had the highest adsorption capacity at pH=7.The rubidium mass concentration of 10 mg/L at 25 ℃ could be equilibrated after 3 h of adsorption，and the corresponding adsorption capacity was 93.79 mg/g.The the kinetic process was consistent with pseudo-secondary kinetics，indicating that chemical adsorption was the key rate-controlling step.And the isothermal adsorption behaviors were consistent with the Langmuir model，suggesting that the adsorption process was monolayer adsorption.Through desorption with 0.5 mol/L HCl/NH₄Cl，the removal rate of Rb⁺ could reach 95.4%.In addition，GPP-KCuFC could still show favorable adsorption and desorption effects when it was applied to brine in the real system.

Key words: potassium copper ferrocyanide, hydrogel, adsorption, rubidium, salt lake brine

CLC Number:

TQ138.11

LIN Peihua, JIANG Huaitao, FU Yibo. Study on preparation of potassium copper ferrocyanide composite hydrogels and rubidium adsorption[J]. Inorganic Chemicals Industry, 2026, 58(3): 32-40.

Figures/Tables 18

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吸附剂用量/mg	ρ（Li⁺）/（mg·L^-1）	ρ（Na⁺）/（mg·L^-1）	ρ（Mg²⁺）/（mg·L^-1）	ρ（K⁺）/ （mg·L^-1）	ρ（Rb⁺）/（mg·L^-1）	ρ（Cs⁺）/（mg·L^-1）
0	7.29	1 139.65	10 241.57	2 655.88	9.87	0.14
5	7.21	1 137.12	10 148.24	2 667.90	8.27	0.02
10	7.16	1 106.41	10 022.20	2 674.43	7.20	—
20	7.15	1 081.55	9 777.37	2 711.11	5.49	—
30	7.08	1 076.87	9 933.63	2 737.79	4.18	—
40	7.00	1 072.18	9 719.92	2 791.01	3.31	—
50	6.99	1 066.28	9 819.51	2 807.13	2.53	—

吸附剂用量/mg	ρ（Li⁺）/（mg·L^-1）	ρ（Na⁺）/（mg·L^-1）	ρ（Mg²⁺）/（mg·L^-1）	ρ（K⁺）/（mg·L^-1）	ρ（Rb⁺）/（mg·L^-1）	ρ（Cs⁺）/（mg·L^-1）
5	0.22	—	30.97	4.30	1.51	—
10	0.22	—	62.69	13.82	2.51	—
20	0.25	—	128.28	30.80	4.11	—
30	0.25	—	157.67	35.65	5.32	—
40	0.28	0.12	229.12	53.75	6.00	—
50	0.35	1.15	295.56	69.25	6.52	—

干扰离子	α	干扰离子	α
Li⁺	67.60	Cs⁺
Na⁺	41.79	Mg²⁺	67.51
K⁺	-53.93

National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on preparation of potassium copper ferrocyanide composite hydrogels and rubidium adsorption

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