一种铀酰配合物的合成、结构分析及对染料吸附性能的研究
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摘要
在常温下,采用UO_2(Ac)_2·2H_2O与间甲氧基苯甲酸(HL)反应得到一例铀酰配合物([(UO_2)(DMSO)(L)_2]_2)(DMSO:二甲亚砜)。通过X-射线单晶衍射分析配合物属于三斜晶系,P1空间群,a=10. 744(2) ?,b=14.467(3) ?,c=14.632(3) ?,α=91.04(3)°,β=107.87(3)°,γ=94.59(3)°,V=2155.5(8) ?~3,D_c=2.004 g/cm~3,Z=2。U(Ⅵ)离子均为七配位的UO_7五角双锥构型。此外,研究了配合物对染料的吸附性能。结果表明,配合物对阳离子染料具有较好的吸附性能,其中对罗丹明B的最大吸附量达到249.87mg/g,对阴离子染料的吸附几乎可以忽略,说明配合物具有选择性吸附阳离子染料的性能。
UO_2(Ac)_2·2H_2O Reacted with m-methoxybenzoic acid( HL) at room temperature to obtain the uranyl complex( [(UO_2)( DMSO)(L)_2]_2).The crystal structure of the complex was characterized by single-crystal X-ray diffraction analysis.The crystallographic data are as follows:( [( UO_2)(DMSO)(L)_2]_2) belongs to the triclinic with space group P1,a=10.744(2) ?,b=14.467(3) ?,c=14.632(3) ?,α=91.04(3)°,β=107.87(3)°,γ=94.59(3) °,V = 2155.5(8) ?~3,D_c=2.004g/cm~3,Z=2,in which U(Ⅵ) ions show 7-fold coordination environment,demonstrating UO_7 pentagonal bipyramidal geometries.In addition,the adsorption properties of( [(UO_2)(DMSO)(L)_2]_2) towards organic dyes are investigated. The results show that( [(UO_2)(DMSO)(L)_2]_2) has good adsorption performance for cationic dyes,and the maximum adsorption amount of rhodamine B(RhB~+) is up to 249.87mg/g,but the adsorption capacity to anionic dyes is negligible.These findings indicate that this uranyl complex possesses the excellent absorbing property towards cationic dyes.
UO_2(Ac)_2·2H_2O Reacted with m-methoxybenzoic acid( HL) at room temperature to obtain the uranyl complex( [(UO_2)( DMSO)(L)_2]_2).The crystal structure of the complex was characterized by single-crystal X-ray diffraction analysis.The crystallographic data are as follows:( [( UO_2)(DMSO)(L)_2]_2) belongs to the triclinic with space group P1,a=10.744(2) ?,b=14.467(3) ?,c=14.632(3) ?,α=91.04(3)°,β=107.87(3)°,γ=94.59(3) °,V = 2155.5(8) ?~3,D_c=2.004g/cm~3,Z=2,in which U(Ⅵ) ions show 7-fold coordination environment,demonstrating UO_7 pentagonal bipyramidal geometries.In addition,the adsorption properties of( [(UO_2)(DMSO)(L)_2]_2) towards organic dyes are investigated. The results show that( [(UO_2)(DMSO)(L)_2]_2) has good adsorption performance for cationic dyes,and the maximum adsorption amount of rhodamine B(RhB~+) is up to 249.87mg/g,but the adsorption capacity to anionic dyes is negligible.These findings indicate that this uranyl complex possesses the excellent absorbing property towards cationic dyes.
引文
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[5]MANEERUNG T,LIEW J,DAI Y,et al.Activated carbon derived from carbon residue from biomass gasification and its application for dye adsorption:kinetics,isotherms and thermodynamic studies[J]. Bioresource Technol.,2016,200:350-359.
[6]HAN R P,WANG Y,SUN Q,et al.Malachite green adsorption onto natural zeolite and reuse by microwave irradiation[J]. J. Hazard. Mater.,2010,175(1/3):1 056-1 061.
[7]WAWRZKIEWICZ M,WISNIEWSKA M,GUNKO V M,et al.Adsorptive removal of acid,reactive and direct dyes from aqueous solutions and wastewater using mixed silicaalumina oxide[J]. Powder Technol.,2015,278:306-315.
[8]HE Y C,YANG J,KAN W Q,et al.A new microporous anionic metal-organic framework as a platform for highly selective adsorption and separation of organic dyes[J].J.Mater.Chem.A,2015,3(4):1 675-1 681.
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[10]LIU Q X,ZENG C M,AI L H,et al. Boosting visible light photoreactivity of photoactive metal-organic framework:designed plasmonic Z-scheme Ag/Ag Cl@MIL-53-Fe[J].Appl.Catal.B-Environ.,2018,224:38-45.
[11]WEISS A,REIMER N,STOCK N,et al. Screening of mixed-linker CAU-10 MOF materials for humidity sensing by impedance spectroscopy[J]. Micropor. Mesopor.Mat.,2016,220:39-43.
[12]HU F L,DI Z Y,LIN P,et al.An anionic uranium-based metal-organic framework with ultralarge nanocages for selective dye adsorption[J]. Cryst. Growth Des.,2018,18(2):576-580.
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[14]SHELDRICK G M.SHELXL-97[CP].Program zur Verfeinerrung von Kristallstrukturen.Gottingen,2008.
[15]LI C,WANG X J,MENG D Y,et al.Facile synthesis of low-cost magnetic biosorbent from peach gum polysaccharide for selective and efficient removal of cationic dyes[J].Int.J.Biol.Macromol.,2018,107:1 871-1 878.