Zr-based metal-organic framework UiO-66-NH2 was prepared by solvent-thermal method, and a composite metal-organic framework material UiO-66-NH2 (Ce) was prepared by UiO-66-NH2 doped with rare earth metal element Cerium (Ce), the two materials were characterized, and the adsorption performance of UiO-66-NH2 (Ce) on the anion dye acid orange 7 (AO7) was studied. The results show that the morphology and functional groups of the two materials are almost identical, but the specific surface area (618.50 m2/g) and pore volume (0.303 3 cm3/g) of UiO-66-NH2(Ce) are significantly larger than those of UiO-66-NH2. The adsorption capacity of UiO-66-NH2(Ce) for AO7 is 303.0 mg/g and the adsorption rate is 85.8% at pH 5.0, reaction temperature 25 ℃, initial mass concentration of AO7 50 mg/L and reaction time 60 min. The adsorption kinetics of UiO-66-NH2(Ce) to AO7 conforms to the quasi-secondary kinetic model, and the adsorption process conforms to the Langmuir monolayer chemisorption model, and the adsorption process is spontaneous and endothermic. After regeneration by analysis, the adsorption performance of UiO-66-NH2(Ce) decreased, and the regeneration rate was low because the material is powder crystal.
仪器:721G型可见分光光度计(上海仪电分析仪器有限公司);MIRA 3型场发射扫描电镜(SEM-EDS,TESCAN公司);MiniFlex600型X射线衍射仪(XRD,Rigaku公司);Belsorp mini Ⅱ型全自动比表面及孔隙度测定仪(BET,MicrotracBEL公司);Nicolet 5700型Fourier红外光谱仪(FT-IR,Thermo Electron公司)。
1.2 材料制备
1.2.1 UiO-66-NH2
采用改进后的溶剂热法合成UiO-66-NH2[23]。将1.448 g NH2-H2BDC(8 mmol)和1.864 g ZrCl4(8 mmol)于50 mL DMF中混合,加入1 mL浓盐酸,超声分散至全部溶解,转移至水热反应釜中,于110 ℃反应24 h,冷却至室温,离心。产物依次用DMF、无水甲醇洗净,于110 ℃真空干燥12 h,得到UiO-66-NH2。
1.2.2 UiO-66-NH2(Ce)
UiO-66-NH2(Ce)也采用溶剂热法合成。将1.448 g NH2-H2BDC(8 mmol)和1.678 g ZrCl4(7.2 mmol)及0.298 g CeCl3·7H2O(0.8 mmol)于50 mL DMF中混合,加入1 mL浓盐酸,超声分散至全部溶解,添加至水热反应釜中,于110 ℃反应24 h,冷却至室温,离心。产物依次用DMF、无水甲醇洗净,于110 ℃真空干燥12 h,得到UiO-66-NH2(Ce)。
UDDINM J, AMPIAWR E, LEEW. Adsorptive removal of dyes from wastewater using a metal-organic framework: A review[J]. Chemosphere, 2021, 284: 131314. DOI:10.1016/j.chemosphere.2021.131314 .
[2]
NITHYAR, THIRUNAVUKKARASUA, SATHYAA B, et al. Magnetic materials and magnetic separation of dyes from aqueous solutions: A review[J]. Environmental Chemistry Letters, 2021, 19(2): 1275-1294. DOI:10.1007/s10311-020-01149-9 .
[3]
KANH S, SOKLUNH, YANGZ S, et al. Purification of dye wastewater using bicarbonate activated hydrogen peroxide: Reaction process and mechanisms[J]. Separation and Purification Technology, 2020, 232: 115974. DOI:10.1016/j.seppur.2019.115974 .
SHAOZ C, LUJ, MAM L, et al. Adsorption of acid orange 7 on magnetic covalent triazine-based frameworks[J]. Technology of Water Treatment, 2020, 46(9): 63-68. DOI:10.16796/j.cnki.1000-3770.2020.09.013(Ch ).
YANGC W, HEQ, YED W, et al. Synthesis of mesoporous CeO2 induced by hydrogen peroxide and their adsorption of acid orange 7 organic dye[J]. Journal of Leshan Normal University, 2020, 35(12): 27-32. DOI:10.16069/j.cnki.51-1610/g4.2020.12.005(Ch ).
ZHANGC G, KUANGY F, ZHONGC R, et al. Research progress on adsorption property of covalent organic framework[J]. New Chemical Materials, 2021, 49(S1): 73-77. DOI:10.19817/j.cnki.issn1006-3536.2021.S.015(Ch ).
TANGC C, HUANGC X. Progress in adsorption and removal of heavy metal ions by covalent organic framework materials[J]. Technology of Water Treatment, 2022, 48(3): 1-6. DOI:10.16796/j.cnki.1000-3770.2022.03.001(Ch ).
[12]
TIANS H, XUS, LIUJ T, et al. Highly efficient removal of both cationic and anionic dyes from wastewater with a water-stable and eco-friendly Fe-MOF via host-guest encapsulation[J]. Journal of Cleaner Production, 2019, 239: 117767. DOI:10.1016/j.jclepro.2019.117767 .
[13]
YOONS, CALVOJ, SO M. Removal of acid orange 7 from aqueous solution by metal-organic frameworks[J]. Crystals, 2018, 9(1): 17. DOI:10.3390/cryst9010017 .
SONGZ X, CAIC Q, ZHAOX Y, et al. Kinetic characteristics of adsorptive removal of AO7 with zeolitic imidazolate framework-67[J]. Journal of Safety and Environment, 2020, 20(5): 1871-1878. DOI:10.13637/j.issn.1009-6094.2019.1255(Ch ).
RENL F, GAOX L, ZHANGX Y, et al. Preparation and absorption performance of UiO-66-NH2/MoS2@PUF for Cr(Ⅵ)[J/OL]. Fine Chemicals, 2023,40(2):398-406+447. DOI:10.13550/j.jxhg.20220475(Ch ).
PENGY, WUY, YANGZ W, et al. Research progress on preparation and catalytic performance of UiO-66-NH2/ZIF-8 composites[J]. Guangzhou Chemical Industry, 2020, 48(13): 4-6. DOI:10.3969/j.issn.1001-9677.2020.13.003(Ch ).
LIUK L, PENGS W, SHIC, et al. Study on the adsorption of Ni(Ⅱ) in water by UiO-66-NH2/graphene oxide[J]. Environmental Protection and Technology, 2020, 26(4): 1-7. DOI:10.3969/j.issn.1674-0254.2020.04.001(Ch ).
ZHAOR M, YED J, GAOZ X, et al. UiO series of metal-organic frameworks composites as advanced sorbents for the removal of heavy metal ions[J]. Journal of Guangdong University of Petrochemical Technology, 2022, 32(3): 60-64. DOI:10.3969/j.issn.2095-2562.2022.03.014(Ch ).
[25]
ELTAWEILA S, ELSHISHINIH M, GHATASSZ F, et al. Ultra-high adsorption capacity and selective removal of Congo red over aminated graphene oxide modified Mn-doped UiO-66 MOF[J]. Powder Technology, 2021, 379: 407-416. DOI:10.1016/j.powtec.2020.10.084 .
[26]
LIUM, LIS J, TANGN, et al. Highly efficient capture of phosphate from water via cerium-doped metal-organic frameworks[J]. Journal of Cleaner Production, 2020, 265: 121782. DOI:10.1016/j.jclepro.2020.121782 .
[27]
LIQ P, YANB. Multi-component assembly of luminescent rare earth hybrid materials[J]. Journal of Rare Earths, 2019, 37(2): 113-123. DOI:10.1016/j.jre.2018.10.001 .
WUC, LIANGM J, LIAOH H, et al. Research progress of application of rare earth elements in medical magnesium alloys[J]. Hot Working Technology, 2018, 47(18): 15-17. DOI:10.14158/j.cnki.1001-3814.2018.18.004(Ch ).
LIUJ J, ZHAOW. Research progress on rare earth modified bismuth vanadate photocatalytic materials[J]. Chemical Research and Application, 2021, 33(11): 2081-2095. DOI:10.3969/j.issn.1004-1656.2021.11.005(Ch ).
[32]
YANGJ M, YINGR J, HANC X, et al. Adsorptive removal of organic dyes from aqueous solution by a Zr-based metal-organic framework: Effects of Ce(Ⅲ) doping[J]. Dalton Transactions, 2018, 47(11): 3913-3920. DOI:10.1039/c8dt00217g .
[33]
ZHAOD X, CAIC. Cerium-based UiO-66 metal-organic framework for synergistic dye adsorption and photodegradation: A discussion of the mechanism[J]. Dyes and Pigments, 2021, 185: 108957. DOI:10.1016/j.dyepig.2020.108957 .
[34]
LVS W, LIUJ M, MAH, et al. Simultaneous adsorption of methyl orange and methylene blue from aqueous solution using amino functionalized Zr-based MOFs[J]. Microporous and Mesoporous Materials, 2019, 282: 179-187. DOI:10.1016/j.micromeso.2019.03.017 .
[35]
JINL J, LIUH, XUA H, et al. Defective UiO-66-NH2 (Zr/Ce) catalyzes the synthesis of propylene carbonate under mild conditions[J]. Microporous and Mesoporous Materials, 2021, 317: 110997. DOI:10.1016/j.micromeso.2021.110997 .
[36]
ZHANGX T, LIUM Y, HANR P. Adsorption of phosphate on UiO-66-NH2 prepared by a green synthesis method[J]. Journal of Environmental Chemical Engineering, 2021, 9(6): 106672. DOI:10.1016/j.jece.2021.106672 .
[37]
KA D, JANGS, KIMM K, et al. UiO-66-NH2/graphene oxide nanocomposites as reactive adsorbents for soman upon long-term exposure to high-humidity environment[J]. Materials Letters, 2021, 285: 129105. DOI:10.1016/j.matlet.2020.129105 .
ZHANGF, ZHAOR H, WANGX Y, et al. Preparation of Indium-based MOFs and adsorption properties for methylene blue in wastewater[J]. Modern Chemical Industry, 2021, 41(3): 196-201. DOI: 10.16606/j.cnki.issn0253-4320.2021.03.039 .
ZHANGY, HOUY Z, YUZ S, et al. Preparation of Cu-MOF-199/copper sulfide and its electrocatalytic performance on CO2 reduction[J]. Journal of Wuhan University (Natural Science Edition), 2022, 68(2): 203-208. DOI:10.14188/j.1671-8836.2021.0296(Ch ).
[42]
MAOQ S, LIUX G, LIY, et al. Modulation synthesis of UiO-66 and its outstanding adsorption properties towards low-concentration methylene blue[J]. Zeitschrift Für Anorganische Und Allgemeine Chemie, 2021, 647(7): 731-741. DOI:10.1002/zaac.202000332 .
[43]
CHANGZ Y, LIF X, QIX Y, et al. Selective and efficient adsorption of Au(Ⅲ) in aqueous solution by Zr-based metal-organic frameworks (MOFs): An unconventional way for gold recycling[J]. Journal of Hazardous Materials, 2020, 391: 122175. DOI:10.1016/j.jhazmat.2020.122175 .
CHENM R, HUANGY P, ZHANGJ L, et al. Adsorption of cadmium in water by sheep manure biochar[J]. Journal of Wuhan University (Natural Science Edition), 2022, 68(6): 612-620. DOI:10.14188/j.1671-8836.2021.0322(Ch ).
MOJ Y, XIANGP, LIM Y, et al. Performance of Ac-Co/UiO-66 on adsorption of anionic dyes in aqueous solution[J]. Acta Scientiae Circumstantiae, 2021, 41(7): 2740-2747. DOI:10.13671/j.hjkxxb.2020.0496(Ch ).