Selective capture of silver ions from aqueous solution by series of azole derivatives-functionalized silica nanosheets

doi:10.1016/j.cjche.2022.09.001

Abstract

Abstract: The introduction of bifunctional groups into low-cost adsorbents for selective adsorption of Ag(I) through synergistic effect will have a profound impact on the recovery of precious metals. Organo silica nanosheets (organo-SiNSs) functionalized by series of azole derivatives (2-mercaptoimidazole (MI), 2-mercaptobenzimidazole (MBT) and 1H-1,2,4-triazole-3-thiol (MTT)), are fabricated and employed for selective removal of Ag(I). The structures of the organo-SiNSs are investigated using several characterization methods. The results of batch adsorption experiments display that the maximum adsorption amounts are 70.3, 103.2 and 139.5 mg·g^-1 on MI-SiNSs, MBI-SiNSs and MTT-SiNSs for Ag(I) ions, and reach rapid equilibrium within 10–30 min. The adsorption processes are chemisorption and fit pseudo-second-order kinetic model and Langmuir adsorption isotherm model. Notably, MTT-SiNSs is greatly selective for Ag(I) in multicomponent system, and the distribution coefficient value of Ag(I) ions reaches 2331.26 ml·g^-1. The reusability of organo-SiNSs is verified by four cycles of regeneration tests with 0.1 mol·L^–1 HNO₃ as the eluent. A combination of experimental, structural along with theoretical analysis is conducted to proclaim the structure-adsorptivity relationship: (i) The adsorption mechanisms are attributed to complexation. (ii) The amino group and sulfhydryl group of MTT-SiNSs as well as MBI-SiNSs may have synergistic impacts on Ag(I) capture. (iii) The differences in adsorption behavior and selectivity of the three organo-SiNSs are mainly related to the form of function groups, charge density and steric hindrance of adsorbent. This work not only sheds light on the promise of functionalized organo-SiNSs for the rapid and selective removal/enrichment of Ag(I) ions in complex water systems, but also provides new insights for designing cost-effective SiNSs-based adsorbents.

Key words: Organo silica nanosheets, Adsorption, Silver ions, Selectivity, Mechanism, Waste treatment

摘要： The introduction of bifunctional groups into low-cost adsorbents for selective adsorption of Ag(I) through synergistic effect will have a profound impact on the recovery of precious metals. Organo silica nanosheets (organo-SiNSs) functionalized by series of azole derivatives (2-mercaptoimidazole (MI), 2-mercaptobenzimidazole (MBT) and 1H-1,2,4-triazole-3-thiol (MTT)), are fabricated and employed for selective removal of Ag(I). The structures of the organo-SiNSs are investigated using several characterization methods. The results of batch adsorption experiments display that the maximum adsorption amounts are 70.3, 103.2 and 139.5 mg·g^-1 on MI-SiNSs, MBI-SiNSs and MTT-SiNSs for Ag(I) ions, and reach rapid equilibrium within 10–30 min. The adsorption processes are chemisorption and fit pseudo-second-order kinetic model and Langmuir adsorption isotherm model. Notably, MTT-SiNSs is greatly selective for Ag(I) in multicomponent system, and the distribution coefficient value of Ag(I) ions reaches 2331.26 ml·g^-1. The reusability of organo-SiNSs is verified by four cycles of regeneration tests with 0.1 mol·L^–1 HNO₃ as the eluent. A combination of experimental, structural along with theoretical analysis is conducted to proclaim the structure-adsorptivity relationship: (i) The adsorption mechanisms are attributed to complexation. (ii) The amino group and sulfhydryl group of MTT-SiNSs as well as MBI-SiNSs may have synergistic impacts on Ag(I) capture. (iii) The differences in adsorption behavior and selectivity of the three organo-SiNSs are mainly related to the form of function groups, charge density and steric hindrance of adsorbent. This work not only sheds light on the promise of functionalized organo-SiNSs for the rapid and selective removal/enrichment of Ag(I) ions in complex water systems, but also provides new insights for designing cost-effective SiNSs-based adsorbents.

关键词: Organo silica nanosheets, Adsorption, Silver ions, Selectivity, Mechanism, Waste treatment

Shanshan Mao, Tao Shen, Qing Zhao, Tong Han, Fan Ding, Xin Jin, Manglai Gao. Selective capture of silver ions from aqueous solution by series of azole derivatives-functionalized silica nanosheets[J]. Chinese Journal of Chemical Engineering, 2023, 57(5): 319-328.

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