In this study,using β-cyclodextrin (β-CD) as the matrix,a star-shaped β-cyclodextrin grafted amidoxime polymer adsorbent (β-CD-PAO) was synthesized via a two-step method of graft copolymerization and amidoximation.The physicochemical structure of the adsorbent was characterized by scanning electron microscopy (SEM),Brunauer-Emmett-Teller (BET) method,thermogravimetric (TG) analysis,Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS).The adsorption behavior and selectivity of β-CD-PAO toward gallium ions [Ga(Ⅲ)] were systematically investigated,and its practical application performance in real Bayer mother liquor as well as cyclic regeneration performance were verified.The results show that β-CD-PAO possesses a favorable pore structure and thermal stability,as well as high selectivity toward Ga(Ⅲ).Under the working conditions of Bayer mother liquor at 60℃,the adsorption equilibrium can be reached within as short as 6 min,with a maximum saturated adsorption capacity of 33.1 mg/g.Using 0.1 mol/L nitric acid as the desorbent,the adsorbent still maintained an adsorption capacity retention rate of over 81% after 5 consecutive adsorption-desorption cycles.The adsorption process conforms well to the pseudo-second-order kinetic model and Langmuir isotherm model,which is a spontaneous and endothermic coordination chelation process.This adsorbent provides a new alternative for the efficient separation and recovery of gallium.
KouZ, BianW, WangC. Preparation of novel amidoxime resin and its performance in gallium(Ⅲ) extraction from Bayer liquor[J]. Chemical Engineering Journal Advances, 2022, 11:100317.
[6]
LuS, ChenL, HamzaM F, et al. Amidoxime functionalization of a poly(acrylonitrile)/silica composite for the sorption of Ga(Ⅲ)-Application to the treatment of Bayer liquor[J]. Chemical Engineering Journal, 2019, 368:459-473.
[7]
LuF, XiaoT, LinJ, et al. Resources and extraction of gallium:A review[J]. Hydrometallurgy, 2017, 174:105-115.
[8]
ZhaoZ, LiX, ChaiY, et al. Adsorption performances and mechanisms of amidoxime resin toward Gallium(Ⅲ) and Vanadium(Ⅴ) from bayer liquor[J].ACS Sustainable Chemistry & Engineering, 2015, 4(1):53-59.
[9]
LongH, ZhaoZ, ChaiY, et al. Binding mechanism of the amidoxime functional group on chelating resins toward gallium(Ⅲ) in Bayer liquor[J]. Industrial & Engineering Chemistry Research, 2015, 54(33):8025-8030.
[10]
GuoW, ZhangJ, YangF, et al. Highly efficient and selective recovery of gallium achieved on an amide-functionalized cellulose[J]. Separation and Purification Technology, 2020, 237:116355.
[11]
YiT, CenZ, JiY, et al. Amidoxime-based star polymer adsorbent with ultra-high uranyl affinity for extremely fast uranium extraction from natural seawater[J]. Advanced Functional Materials, 2024, 34(41):2404220.
[12]
LvZ, FanG, BaiY, et al. Dual-ligand metal-organic frameworks via in situ amidoxime engineering for selective ion separation[J]. Advanced Functional Materials, 2026, 36(30):e26751.
[13]
StockN, BiswasS. Synthesis of metal-organic frameworks (MOFs):Routes to various MOF topologies,morphologies,and composites[J]. Chemical Reviews, 2012, 112(2):933-969.
[14]
ShekhahO, LiuJ, FischerR, et al. MOF thin films:Existing and future applications[J]. Chemical Society Reviews, 2011, 40(2):1081-1106.
[15]
QinZ, WangS, ZhangS, et al. Cross-linked amidoxime porous resin for selective gallium separation in Bayer solutions:Reaction mechanism and kinetic study[J]. Chemical Engineering Journal, 2024, 481:148340.
[16]
DiakonovI I, PokrovskiG S, BénézethP, et al. Gallium speciation in aqueous solution.Experimental study and modelling:Part 1.Thermodynamic properties of Ga(OH)4— to 300 C[J].Geochimica et Cosmochimica Acta, 1997, 61(7):1333-1343.
[17]
卢思名. 树脂吸附法从拜耳溶液中分离回收镓的研究[D]. 南宁: 广西大学, 2020.
[18]
ZhaoY, LiJ, ZhaoL, et al. Synthesis of amidoxime-functionalized Fe3O4@SiO2 core-shell magnetic microspheres for highly efficient sorption of U(Ⅵ)[J]. Chemical Engineering Journal, 2014, 235:275-283.
[19]
秦治峰. 偕胺肟基吸附剂的制备及对镓离子的分离性能研究[D]. 成都: 四川大学, 2023.
[20]
LuX, HeS, ZhangD, et al. Synthesis and characterization of amidoxime modified calix[8] arene for adsorption of U(Ⅵ) in low concentration uranium solutions[J].RSC Advances, 2016, 6(103):101087-101097.