磁性壳聚糖复合微球的制备及其Cu~(2+)吸附性能
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摘要
以球磨后的粉煤灰磁珠(MS)颗粒为磁核,通过溶胶凝胶法和反相微乳液法依次包覆SiO_2和壳聚糖(CS),制备了MS@SiO_2@CS磁性微球。利用扫描电镜及能量色散谱仪、热重分析仪、红外光谱仪、X射线衍射仪、振动样品磁强计对所得样品的结构和磁性进行了系统表征。结果表明,磁珠颗粒表面实现了逐层包覆,较均匀的分散于壳聚糖基体中,MS@SiO_2@CS微球的比饱和磁化强度可达7.04 emu·g~(-1)。Cu~(2+)离子吸附实验表明,所得磁性壳聚糖微球对Cu~(2+)具有良好的吸附能力,最大吸附量可达11.08 mg·g~(-1);而且可通过磁选法高效固液分离。吸附动力学研究表明,MS@SiO_2@CS微球对Cu~(2+)离子的吸附符合准二级动力学模型,以化学吸附为主。
MS@SiO_2@CS magnetic micron spheres were fabricated by successively coating the ball-milled coal fly ash magneticsphere(MS) particles with SiO_2 and chitosan(CS) through a sol-gel and an inverse microemulsion method, respectively.The structures and properties were carefully characterized by scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), thermogravimetric analysis(TGA), Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), and vibrating sample magnetometer(VSM).The results showed that the MS particles were coated layer by layer of SiO_2 and CS,respectively, and relative evenly distributed in the CS substrate.Since MSs are magnetic, the MS@SiO_2@CS samples also show relatively strong magnetism with a specific saturation magnetization of 7.04 emu·g~(-1).Adsorption experiments indicated that the magnetic composite micronspheres showed the good adsorption capability for Cu~(2+)ions, and the adsorption capacity was up to 11.08mg·g~(-1).In addition, after Cu~(2+)adsorption, the adsorbents could be separated effectively from water by magnetic separation.According to the adsorption kinetics simulation, the Cu~(2+)adsorption of MS@SiO_2@CS corresponds to pseudo second order kinetics, which implies a dominant chemical adsorption.
MS@SiO_2@CS magnetic micron spheres were fabricated by successively coating the ball-milled coal fly ash magneticsphere(MS) particles with SiO_2 and chitosan(CS) through a sol-gel and an inverse microemulsion method, respectively.The structures and properties were carefully characterized by scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS), thermogravimetric analysis(TGA), Fourier transform infrared spectroscopy(FTIR), X-ray diffraction(XRD), and vibrating sample magnetometer(VSM).The results showed that the MS particles were coated layer by layer of SiO_2 and CS,respectively, and relative evenly distributed in the CS substrate.Since MSs are magnetic, the MS@SiO_2@CS samples also show relatively strong magnetism with a specific saturation magnetization of 7.04 emu·g~(-1).Adsorption experiments indicated that the magnetic composite micronspheres showed the good adsorption capability for Cu~(2+)ions, and the adsorption capacity was up to 11.08mg·g~(-1).In addition, after Cu~(2+)adsorption, the adsorbents could be separated effectively from water by magnetic separation.According to the adsorption kinetics simulation, the Cu~(2+)adsorption of MS@SiO_2@CS corresponds to pseudo second order kinetics, which implies a dominant chemical adsorption.
引文
[1]Cheng K C,Kong X Y,Goh T L,et al.Carbohydr.Polym.,2016,138:16-26
[2]Fan C,Li K,Wang Y,et al.RSC Adv.,2015,6(4):2678-2686
[3]Ren Y,Abbood H A,He F,et al.Chem.Eng.J.,2013,226:300-311
[4]Zhu Y,Hu J,Wang J.Prog.Nucl.Energy,2014,71:172-178
[5]Monier M,Ayad D M,Wei Y,et al.J.Hazard.Mater.,2010,177(1/2/3):962-970
[6]Cho D W,Jeon B H,Chon C M,et al.J.Ind.Eng.Chem.,2015,28:60-66
[7]WU Xian-Feng(吴先锋),LI Jian-Jun(李建军),ZHU Jin-Bo(朱金波),et al.Mater.Rev.(材料导报),2015,29(23):103-107
[8]Pan J M,Yao H,Li X X,et al.J.Hazard.Mater.,2011,190(1/2/3):276-284
[9]Sun X,Li Q,Yang L,et al.Particuology,2016,26:79-86
[10]Xu Y Y,Dang Q F,Liu CS,et al.Colloids Surf.A,2015,482:353-364
[11]PENG Hong-Xia(彭红霞),HU Chuan-Yue(胡传跃),WU Teng-Yan(吴腾宴),et al.Chinese J.Inorg.Chem.(无机化学学报),2016,32(7):1154-1160
[12]Peng S,Meng H C,Yong O Y,et al.Ind.Eng.Chem.Res.,2014,53:2106-2113
[13]Park J,Hong Y K,Kim S G,et al.J.Magn.Magn.Mater.,2014,355:1-6
[14]YANG Run-Ping(杨润萍),LI Xiao-Xia(李晓霞),CHEN Wei(陈微),et al.Chin.J.Health Lab.Technol.(中国卫生检验杂志),2007,12(17):2217-2219
[15]LIU Yun-Fang(刘云芳),REN Sen(任森),WU Ri-Liang(吴日良),et al.Chinese J.Inorg.Chem.(无机化学学报),2015,31(12):2373-2378
[16]WANG Jun(王珺),CAI Wei-Quan(蔡卫权),WU Xuan-Jun(吴选军).Chinese J.Inorg.Chem.(无机化学学报),2014,30(11):2564-2570
[17]Lu C,Yu S,Yao T,et al.J.Porous Mater.,2015,22(5):1255-1263
[18]Cai Y,Zheng L,Fang Z.RSC Adv.,2015,5(118):97435-97445
[19]Wei P,Xie Z,Ge C,et al.J.Hazard.Mater.,2015,294:9-16
[20]Negm N A,Sheikh RE,El-Farargy A F,et al.J.Ind.Eng.Chem.,2014,21:526-534
[21]Goze B,Evirgen O A,Acikel Y S.Desalin.Water Treat.,2014,57(9):4059-4072
[2]Fan C,Li K,Wang Y,et al.RSC Adv.,2015,6(4):2678-2686
[3]Ren Y,Abbood H A,He F,et al.Chem.Eng.J.,2013,226:300-311
[4]Zhu Y,Hu J,Wang J.Prog.Nucl.Energy,2014,71:172-178
[5]Monier M,Ayad D M,Wei Y,et al.J.Hazard.Mater.,2010,177(1/2/3):962-970
[6]Cho D W,Jeon B H,Chon C M,et al.J.Ind.Eng.Chem.,2015,28:60-66
[7]WU Xian-Feng(吴先锋),LI Jian-Jun(李建军),ZHU Jin-Bo(朱金波),et al.Mater.Rev.(材料导报),2015,29(23):103-107
[8]Pan J M,Yao H,Li X X,et al.J.Hazard.Mater.,2011,190(1/2/3):276-284
[9]Sun X,Li Q,Yang L,et al.Particuology,2016,26:79-86
[10]Xu Y Y,Dang Q F,Liu CS,et al.Colloids Surf.A,2015,482:353-364
[11]PENG Hong-Xia(彭红霞),HU Chuan-Yue(胡传跃),WU Teng-Yan(吴腾宴),et al.Chinese J.Inorg.Chem.(无机化学学报),2016,32(7):1154-1160
[12]Peng S,Meng H C,Yong O Y,et al.Ind.Eng.Chem.Res.,2014,53:2106-2113
[13]Park J,Hong Y K,Kim S G,et al.J.Magn.Magn.Mater.,2014,355:1-6
[14]YANG Run-Ping(杨润萍),LI Xiao-Xia(李晓霞),CHEN Wei(陈微),et al.Chin.J.Health Lab.Technol.(中国卫生检验杂志),2007,12(17):2217-2219
[15]LIU Yun-Fang(刘云芳),REN Sen(任森),WU Ri-Liang(吴日良),et al.Chinese J.Inorg.Chem.(无机化学学报),2015,31(12):2373-2378
[16]WANG Jun(王珺),CAI Wei-Quan(蔡卫权),WU Xuan-Jun(吴选军).Chinese J.Inorg.Chem.(无机化学学报),2014,30(11):2564-2570
[17]Lu C,Yu S,Yao T,et al.J.Porous Mater.,2015,22(5):1255-1263
[18]Cai Y,Zheng L,Fang Z.RSC Adv.,2015,5(118):97435-97445
[19]Wei P,Xie Z,Ge C,et al.J.Hazard.Mater.,2015,294:9-16
[20]Negm N A,Sheikh RE,El-Farargy A F,et al.J.Ind.Eng.Chem.,2014,21:526-534
[21]Goze B,Evirgen O A,Acikel Y S.Desalin.Water Treat.,2014,57(9):4059-4072