Effect of cationic alkyl chain lengths on the adsorption performance of supported imidazole-based ionic liquids for vanadium(V) recovery

IF 6.7 2区环境科学与生态学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Environmental Technology & Innovation Pub Date : 2025-03-25 DOI:10.1016/j.eti.2025.104174

Shenxu Bao , Bo Chen , Yu Liang , Yimin Zhang , Liuyi Ren

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引用次数: 0

Abstract

Imidazole-based ionic liquids (ILs) with various cationic alkyl chain lengths were immobilized on polystyrene resins (PS[C_nmim][Cl], n = 2, 4, 6, 8, 12) and applied to separate vanadium(V) from vanadium-bearing solutions. The effects of alkyl chain lengths on the adsorption capacity, selectivity and stability of the supported ILs were thoroughly investigated and compared. As the alkyl chain length increases, the adsorption rate of the supported ILs decreases, leading to a longer adsorption equilibrium time. The alkyl chain length hardly affects the adsorption selectivity of vanadium over main impurities. However, the supported ILs with longer alkyl chain length exhibit greater cyclic stability. Among the synthesized five kinds supported ILs, PS[C₆mim][Cl] presents excellent adsorption performance toward vanadium(V). The adsorption capacity reaches 248.25 mg/g, which keeps 94.21 % after 15 adsorption-desorption cycles. Moreover, the separation coefficient of PS[C₆mim][Cl] for V/Fe and V/Al reaches 24.22 and 7.7, severally. Vanadium(V) is mainly adsorbed onto the supported ILs by chemisorption as monolayer, the adsorption mechanism of which is barely affected by the alkyl chain lengths. The adsorption of vanadium is an endothermic process with increasing entropy, and elevated temperature is conducive to adsorption process. In addition, microscopic characterizations show that the structure of the supported ILs is stable, and the ILs are firmly loaded during multiple cycles. This study provides a reference with the design of ILs cationic alkyl chain for supported imidazole-based ILs in the field of vanadium separation and enrichment.

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来源期刊

Environmental Technology & Innovation Environmental Science-General Environmental Science

CiteScore

14.00

自引率

4.20%

发文量

435

审稿时长

74 days

期刊介绍： Environmental Technology & Innovation adopts a challenge-oriented approach to solutions by integrating natural sciences to promote a sustainable future. The journal aims to foster the creation and development of innovative products, technologies, and ideas that enhance the environment, with impacts across soil, air, water, and food in rural and urban areas. As a platform for disseminating scientific evidence for environmental protection and sustainable development, the journal emphasizes fundamental science, methodologies, tools, techniques, and policy considerations. It emphasizes the importance of science and technology in environmental benefits, including smarter, cleaner technologies for environmental protection, more efficient resource processing methods, and the evidence supporting their effectiveness.