Abstract：The copolymer (DFHMA-co-MAA) was prepared by solution polymerization method with dodecafluoroheptyl methacrylate-co-methacrylic acid (DFHMA) and methacrylic acid (MAA) as the monomers. Then DFHMA-co-MAA was blended with polyvinylidene fluoride (PVDF) at certain mass ratio. The carboxyl fluorine-containing ploymer (PVDF-DM) nanofiber membrane was prepared via electrospinning for the adsorption of Cu(II) in the solution. The effect of mass ratio of PVDF and DFHMA-co-MAA on the micro morphology and the adsorption property for Cu(II) of nanofiber membrane was investigated. The results showed that the diameters of PVDF-DM nanofiber membrane were uniformity and the adsorption performance for Cu(II) was the optimum when the mass ratio of PVDF and DFHMA-co-MAA was 1∶2. Therefore, this mass ratio was adopted for the preparation of PVDF-DM. The PVDF-DM nanofiber membrane was characterized by infrared spectroscopy. It was found that the PVDF-DM nanofiber membrane contained some active adsorption group such as —OH and C＝O. The effect of adsorbent dosage, adsorption pH and adsorption time on the adsorption property for Cu(II) by PVDF-DM nanofiber membrane was investigated. Moreover, the kinetic model of this adsorption process was also inveatigated. The results indicated that the adsorption equilibrium was reached at 60min at room temperature when the adsorbent dosage was 0.03g at pH=5. The adsorption rate and adsorption capacity was 94.37% and 62.91mg/g, respectively. The adsorption behavior for Cu(II) by PVDF-DM nanofiber membrane could be described by both pseudo-first-order kinetic model and pseudo-second-order kinetic model, indicating that this adsorption process included both chemical adsorption and physical adsorption. The adsorption ability of PVDF-DM nanofiber membrane for Cu(II) was only decreased by 16.23% after recycling for 5times. In other words, the prepared PVDF-DM nanofiber membrane had good regeneration property.
Cheng K Y,Cai Z Q,Fu J,et al.Synergistic adsorption of Cu(II) and photocatalytic degradation of phenanthrene by a jaboticaba-like TiO2/titanate nanotube composite: An experimental and theoretical study[J].Chemical Engineering Journal,2019,358:1155-1165.
[2]
Gupta M,Gupta H,Kharat D S,et al.Adsorption of Cu(II) by low cost adsorbents and the cost analysis[J].Environmental Technolugy & Innovation,2018,18:91-101.
[3]
Cheng H F.Cu(II) removal from lithium bromide refrigerant by chemical precipitation and electrocoagulation[J].Separation and Purification Technology,2006,52:191-195.
[4]
Jokara M,Mirghaffaria N,Soleimani M,et al.Preparation and characterization of novel bio ion exchanger from medicinal herb waste (chicory) for the removal of Pb2+ and Cd2+ from aqueous solutions[J].Journal of Water Process Engineering,2019,28:88-99.
[5]
Doggaza A,Attoura A,Mostefa M L P,et al.Removal of heavy metals by electrocoagulation from hydrogen carbonate containing waters:Compared cases of divalent iron and zinc cations[J].Journal of Water Process Engineering,2019,29:100795-100902.
[6]
Peydayesh M,Mohammadi T,Bakhtiari O.Effective treatment of dye wastewater via positively charged TETA-MWCNT/PES hybrid nanofiltration membranes[J].Separation & Purification Technology,2018,194:488-502.
[7]
Andersen W C,Bruno T J.Application of a gas-liquid entraining rotor to supercritical fluid extraction removal of iron(III) from water[J].Analytica Chimica Acta,2003,485:1-8.
[8]
Du Z L,Zheng T,Wang P,et al.Experimental and modelling studies on fixed bed adsorption for Cu(II) removal from aqueous solution by carboxyl modified jute fiber[J].Powder Technology,2018,338:952-959.
[9]
Xu G,Wang L,Xie Y J,et al.Highly selective and efficient adsorption of Hg2+ by a recyclable aminophosphonic acid functionalized polyacrylonitrile fiber[J].Journal of Hazardous Materials,2018,344:679-688.
[10]
李丽颖,袁千玄,马胜奎,等.PVDF/AFMS杂化膜的制备及对Cu2+的吸附[J].天津工业大学学报,2017,36(2):6-12.LI Li-ying,YUAN Qian-xuan,MA Sheng-kui,et al.Preparation of PVDF/AFMS hybrid membrane and its adsorption on copper ions[J].Journal of Tianjin Polytechnic University,2017,36(2):6-12.
[11]
宋来洲,刘倩,赵晓丹,等.DTPA改性聚偏氟乙烯膜的制备与表征[J].高分子材料科学与工程,2011,27(2):166-171.SONG Lai-zhou,LIU Qian,ZHAO Xiao-dan,et al.Producing PBT/PET alloy by triphenyl phosphite chain-extending reaction[J].Polymer Materials Science and Engineering,2011,27(2):166-171.
[12]
闫尔云,范英梅,郝小原,等.聚乙烯醇/壳聚糖复合纳米纤维的制备和性能研究[J].齐齐哈尔大学学报:自然科学版,2013,29(6):1-5.YAN Er-yun,FAN Ying-mei,HAO Xiao-yuan,et al.Preparation of polyvinyl alcohol/chitosan hybrid nanofibers and study on their properties[J].Journal of Qiqihar University:Natural Science Edition,2013,29(6):1-5.
[13]
Zang Y A,Yue Q Y,Kan Y J,et al.Research on adsorption of Cr(VI) by poly-epichlorohydrin-dimethylamine (EPIDMA) modified weakly basic anion exchange resin D301[J].Ecotoxicology and Environmental Safety,2018,101:467-473.
[14]
Ahmad M,Manzoor K,Venkatachalam P,et al.Kinetic and thermodynamic evaluation of adsorption of Cu(II) by thiosemicarbazide chitosan[J].International Journal of Biological Macromolecules,2016,92:910-919.
Nthumbi R M,Adelodun A A,Ngila J C.Electrospun and functional PVDF/PAN composite for the removal of trace metals in contaminated water[J].Physics and Chemistry of the Earth,2017,100:225-235.
