Controllable preparation of small-size polysulfone microcapsules (MC) containing 2-ethylhexylphosphonic acid mono-2- ethylhexyl ester (EHPNA) by coaxial microfluidic method was focused on. N2 gas was used as continuous phase to disperse the polymer solution. The influence of polysulfone (PSF) content in the polymer solution and N2 gas flow rate on the structural properties and loading ratio of microcapsules was investigated. The mean diameter of prepared microcapsules was between 0.90 and 1.60 mm. Ultrasound method was adopted to import EHPNA into microcapsules. A very high extractant loading ratio of 6.21 g-EHPNA/g-PSF was achieved when the pore volume was 6.89 mL/g. The extraction performance was determined with lanthanides as the recovered components and with the prepared microcapsules as the separation agent. Close-packed microcapsules enjoyed a fast extraction ki-netics. The maximum uptakes of La3+, Sm3+ and Er3+ were 3.02×10–4 mol/g, 8.05×10–4 mol/g and 5.58×10–4 mol/g, respectively. Microcapsules were reused seven times and showed very good stability. It is promising to apply the microcapsules into the extraction column and realize continuous operation.
参考文献
| [1] | 靖宇,王月,侯海龙,徐建鸿,王运东.Extraction of lanthanides by polysulfone microcapsules containing EHPNA. I. Piercing method[J].稀土学报（英文版）,2015(06):655-663. |
| [2] | Xu J H;Li S W;Tan J;Luo G S .Correlations of droplet formation in T-junction microfluidic devices:from squeezing to dripping[J].MICROFLUIDICS AND NANOFLUIDICS,2008,5:711. |
| [3] | Piccin E;Ferraro D;Sartori P;Chiarello E, Pierno M, Mistura G .Generation of water-in-oil and oil-in-water mi-crodroplets in polyester-toner microfluidic devices[J].Sensors and Actuators B-Chemical,2014,196:525. |
| [4] | Xiang Z Y;Lu Y C;Zou Y;Gong X C Luo G S .Prepara-tion of microcapsules containing ionic liquids with a new solvent extraction system[J].Reactive & Functional Polymers,2008,68:1260. |
| [5] | Lee C P;Lan T S;Lai M F .Fabrication of two-dimensional ferrofluid microdroplet lattices in a microfluidic channel[J].Journal of Applied Physics,2014,115:17B527. |
| [6] | Nisisako T;Torii T;Higuchi T .Droplet formation in a mi-crochannel network[J].Lab on a Chip,2002,2:24. |
| [7] | Anna S L;Bontoux N;Stone H A .Formation of disper-sions using "flow focusing” in microchannels[J].Applied Physics Letters,2003,82:364. |
| [8] | Fu, T.;Wu, Y.;Ma, Y.;Li, H.Z..Droplet formation and breakup dynamics in microfluidic flow-focusing devices: From dripping to jetting[J].Chemical Engineering Science,2012:207-217. |
| [9] | Carrick C;Larsson P A;Brismar H;Aidun C Wagberg L .Native and functionalized micrometre-sized cellulose capsules prepared by microfluidic flow focusing[J].Rsc Adv,2014,4:19061. |
| [10] | Kang E;Shin S;Lee K H;Lee S .Novel PDMS cylindrical channels that generate coaxial flow,and application to fab-rication of microfibers and particles[J].Lab on a Chip,2010,10:1856. |
| [11] | Umbanhowar PB.;Weitz DA.;Prasad V. .Monodisperse emulsion generation via drop break off in a coflowing stream[J].Langmuir: The ACS Journal of Surfaces and Colloids,2000(2):347-351. |
| [12] | Xu JH;Li SW;Lan WJ;Luo GS .Microfluidic approach for rapid interfacial tension measurement[J].Langmuir: The ACS Journal of Surfaces and Colloids,2008(19):11287-11292. |
| [13] | Xu K;Xu J;Lu Y;Luo G .A novel method of fabricating,adjusting,and optimizing polystyrene colloidal crystal nonspherical microparticles from gas-water Janus droplets in a double coaxial microfluidic device[J].Crystal growth and design,2014,14:401. |
| [14] | Gong X C;Lu Y C;Qian Z X;Luo G S .Preparation of uniform microcapsules containing 1-octanol for caprolac-tam extraction[J].Industrial and Engineering Chemistry Research,2009,48:4507. |
| [15] | Thorsen T.;Arnold FH.;Quake SR.;Roberts RW. .Dynamic pattern formation in a vesicle-generating microfluidic device[J].Physical review letters,2001(18):4163-4166. |
| [16] | Xu J H;Luo G S;Li S W;Chen G G .Shear force induced monodisperse droplet formation in a microfluidic device by controlling wetting properties[J].Lab on a Chip,2006,6:131. |
| [17] | Xu J H;Li S W;Tan J;Wang Y J Luo G S .Preparation of highly monodisperse droplet in a T-junction microfluidic device[J].AICHE Journal,2006,52:3005. |
| [18] | Teh S;Lin R;Hung L;Lee A P .Droplet microfluidics[J].Lab on a Chip,2008,8:198. |
| [19] | Ganan-Calvo AM. .Generation of steady liquid microthreads and micron-sized monodisperse sprays in gas streams[J].Physical review letters,1998(2):285-288. |
| [20] | Vladisavljevic G T;Shahmohamadi H;Das D B;Ekanem E E Tauanov Z Sharma L .Glass capillary microfluidics for production of monodispersed poly(DL-lactic acid)and polycaprolactone microparticles:Experiments and nu-merical simulations[J].Journal of Colloid and Interface Science,2014,418:163. |
| [21] | Ward T;Faivre M;Abkarian M;Stone HA .Microfluidic flow focusing: Drop size and scaling in pressure versus flow-rate-driven pumping.[J].Electrophoresis: The Official Journal of the International Electrophoresis Society,2005(19):3716-3724. |
| [22] | Ganan-Calvo A.M.;Barrero A. .A NOVEL PNEUMATIC TECHNIQUE TO GENERATE STEADY CAPILLARY MICROJETS[J].Journal of Aerosol Science,1999(1):117-125. |
| [23] | Ganan-Calvo AM .Enhanced liquid atomization: From flow-focusing to flow-blurring[J].Applied physics letters,2005(21):4101-1-4101-3-0. |
| [24] | Ganan-Calvo AM .Perfectly monodisperse microbubbling by capillary flow focusing: An alternate physical description and universal scaling[J].Physical review.E.Statistical physics, plasmas, fluids, and related interdisciplinary topics,2004(2 Pt.2):7301-1-7301-3-0. |
| [25] | Ganan-Calvo A M;Gordillo J M .Perfectly monodisperse microbubbling by capillary flow focusing[J].Physical Review Letters,2001,87:274501. |
| [26] | Ganan-Calvo AM;Lopez-Herrera JM;Riesco-Chueca P .The combination of electrospray and flow focusing[J].Journal of Fluid Mechanics,2006(0):421-445. |
| [27] | Tan YC;Cristini V;Lee AP .Monodispersed microfluidic droplet generation by shear focusing microfluidic device[J].Sensors and Actuators, B. Chemical,2006(1):350-356. |
| [28] | Takeuchi S;Garstecki P;Weibel D B;Whitesides G M .An axisymmetric flow-focusing microfluidic device[J].Advanced Materials,2005,17:1067. |
| [29] | Yobas L;Martens S;Ong WL;Ranganathan N .High-performance flow-focusing geometry for spontaneous generation of monodispersed droplets[J].Lab on a chip,2006(8):1073-1079. |
| [30] | Xu JH;Li SW;Tan J;Wang YJ;Luo GS .Controllable preparation of monodisperse O/W and W/O emulsions in the same microfluidic device[J].Langmuir: The ACS Journal of Surfaces and Colloids,2006(19):7943-7946. |
| [31] | Utada AS;Fernandez-Nieves A;Stone HA;Weitz DA .Dripping to jetting transitions in coflowing liquid streams[J].Physical review letters,2007(9):094502-1-094502-4-0. |
| [32] | 杨伟伟,骆广生,伍方昱,龚行楚.溶剂挥发法制备萃取剂微胶囊[J].高分子学报,2005(02):207-212. |
| [33] | Gong X C;Lu Y C;Luo G S .Caprolactam recovery by a column packed with polysulfone microcapsules containing 1-octanol[J].Separation and Purification Technology,2009,69:71. |
| [34] | Absorption and desorption of gaseous toluene by an absorbent microcapsules column[J].Journal of hazardous materials,2010(1/3):243. |
| [35] | Tian Jun;Yin Jingqun;Chen kaihong;Rao Guohua;Jiang Mintao;Chi Ruan .Extraction of rare earths from the leach liquor of the weathered crust elution-deposited rare earth ore with non-precipitation[J].International Journal of Mineral Processing,2011(3/4):125-131. |
| [36] | Luo X H;Huang X W;Zhu Z W;Long Z Q Liu Y .Syner-gistic extraction of cerium from sulfuric acid medium us-ing mixture of 2-ethylhexyl phosphonic acid mono 2-ethylhexyl ester and Di-(2-ethyl hexyl)phosphoric acid as extractant[J].Journal of Rare Earths,2009,27:119. |
| [37] | Sun X Q;Ji Y;Chen J;Ma J T .Solvent impregnated resin prepared using task-specific ionic liquids for rare earth separation[J].Journal of Rare Earths,2009,27:932. |
| [38] | 张丽,陈继,金为群,邓岳锋,田君,张阳.Extraction mechanism of cerium(IV) in H2SO4/H3PO4 system using bifunctional ionic liquid extractants[J].稀土学报（英文版）,2013(12):1195-1201. |
| [39] | Tian M M;Jia Q;Liao W P .Studies on synergistic solvent extraction of rare earth elements from nitrate medium by mixtures of 8-hydroxyquinoline with Cyanex 301 or Cyanex 302[J].Journal of Rare Earths,2013,31:604. |
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