H_4SiW_(12)O_(40)/乙烯-乙烯醇共聚物复合纳米纤维膜的制备及光催化性能
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摘要
利用静电纺丝技术制备了H_4SW_(12)O_(40)(SiW_(12))/乙烯-乙烯醇共聚物(EVOH)复合纳米纤维膜. X射线能谱(EDX)和红外光谱(IR)表征结果表明,Si W12负载到EVOH纤维膜中,且其Keggin结构完好无损.Si W12/EVOH复合纳米纤维膜在氙灯光源照射下对甲基橙(MO)表现出优异的光催化活性.当EVOH与Si W12的质量比为2∶1时,MO降解率可达96. 3%.复合纳米纤维膜优异的光催化活性主要归于EVOH与Si W12的协同相互作用.复合纤维膜具有良好的可重复使用性,循环使用3次后,其光催化活性没有明显下降.因此,Si W12/EVOH复合纳米纤维膜在去除废水中有机染料方面具有广阔的应用前景.
H4 SiW12 O40( SiW12)/ethylene vinyl alcohol( EVOH) copolymer composite nanofibrous membrane was prepared by electrospinning. Characterization with energy-dispersive X-ray spectroscopy( EDX) and Fourier transformation infrared spectroscopy( FTIR) indicated that Si W12 was loaded into the EVOH nanofibrous membrane and its Keggin structure remained intact. The as-prepared Si W12/EVOH composite nanofibrous membrane exhibited excellent photocatalytic activity in the degradation of methyl orange( MO)under xenon lamp irradiation. The degradation efficiency of MO reached 96. 3% as the mass ratio of EVOH to Si W12 was 2 ∶ 1,which may be attributed to the synergistic effect of EVOH and SiW12. More importantly,the composite nanofibrous membrane presented an excellent reusability. There was no significant decrease of photocatalytic activity of the catalyst after three cycles of reactions,which mainly because the hydrogen bonds between Si W12 and EVOH could enhance the stability of SiW12 in the membrane. In view of this,Si W12/EVOH composite nanofibrous membranes exhibited the potential for practical applications to eliminate organic dyes from wastewater.
H4 SiW12 O40( SiW12)/ethylene vinyl alcohol( EVOH) copolymer composite nanofibrous membrane was prepared by electrospinning. Characterization with energy-dispersive X-ray spectroscopy( EDX) and Fourier transformation infrared spectroscopy( FTIR) indicated that Si W12 was loaded into the EVOH nanofibrous membrane and its Keggin structure remained intact. The as-prepared Si W12/EVOH composite nanofibrous membrane exhibited excellent photocatalytic activity in the degradation of methyl orange( MO)under xenon lamp irradiation. The degradation efficiency of MO reached 96. 3% as the mass ratio of EVOH to Si W12 was 2 ∶ 1,which may be attributed to the synergistic effect of EVOH and SiW12. More importantly,the composite nanofibrous membrane presented an excellent reusability. There was no significant decrease of photocatalytic activity of the catalyst after three cycles of reactions,which mainly because the hydrogen bonds between Si W12 and EVOH could enhance the stability of SiW12 in the membrane. In view of this,Si W12/EVOH composite nanofibrous membranes exhibited the potential for practical applications to eliminate organic dyes from wastewater.
引文
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[5] Bafana A.,Devi S. S.,Chakrabarti T.,Environ. Rev.,2011,19(NA),350—371
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[7] Habiba U.,Islam M. S.,Siddique T. A.,Afifi A. M.,Ang B. C.,Carbohyd. Polym.,2016,149,317—331
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[9] Wang H.,Yuan X.,Wu Y.,Zeng G.,Dong H.,Chen X.,Leng L.,Wu Z.,Peng L.,Appl. Catal. B:Environ.,2016,186,19—29
[10] Yao T.,Guo S.,Zeng C.,Wang C.,Zhang L.,J. Hazard. Mater.,2015,292,90—97
[11] Yue L.,Wang S.,Shan G.,Wu W.,Qiang L.,Zhu L.,Appl. Catal. B:Environ.,2015,176/177,11—19
[12] Zhao G.,Wu X.,Tan X.,Wang X.,Open Colloid Sci. J.,2010,4(1),19—31
[13] Zhang N.,Liu S.,Xu Y. J.,Nanoscale,2012,4(7),2227—2238
[14] Leal Marchena C.,Lerici L.,Renzini S.,Pierella L.,Pizzio L.,Appl. Catal. B:Environ.,2016,188,23—30
[15] Hong B.,Liu L.,Wang S. M.,Han Z. B.,J. Clust. Sci.,2016,27(2),563—571
[16] Pruethiarenun K.,Isobe T.,Matsushita S.,Nakajima A.,Appl. Catal. A:Gen.,2012,445/446(2),274—279
[17] Corma A.,García H.,Llabrési Xamena F. X.,Chem. Rev.,2010,110(8),4606—4655
[18] Abdal-hayA.,Mousa H. M.,Khan A.,Vanegas P.,Lim J. H.,Colloid. Surfaces A,2014,457,275—281
[19] Ner Y.,Asemota C.,Olson J. R.,Sotzing G. A.,ACS Appl. Mater. Inter.,2009,1(10),2093—2097
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[21] Li T.,Zhang Z.,Li W.,Liu C.,Zhou H.,An L.,J. Appl. Polym. Sci.,2016,133(11),43193
[22] Fu Q.,Wang X.,Si Y.,Liu L.,Yu J.,Ding B.,ACS Appl. Mater. Inter.,2016,8(18),11819—11829
[23] Hori H.,Takano Y.,Koike K.,Takeuchi K.,Einaga H.,Environ. Sci. Technol.,2003,37(2),418—422
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[30] Zhang P.,Shao C.,Li X.,Zhang M.,Zhang X.,Sun Y.,Liu Y.,J. Hazard. Mater.,2012,237,331—338
[31] Troupis A.,Gkika E.,Triantis T.,Hiskia A.,Papaconstantinou E.,J. Photoch. Photobio. A,2007,188(2/3),272—278
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