Fe-Sr_2Bi_2O_5光催化降解低密度聚乙烯膜  

Photocatalytic degradation of LDPE film with Fe-Sr_2Bi_2O_5 photocatalyst under UV and visible light irradiation

作　　者：吴锫 罗学刚[1,2] 李科[1,2] 张思钊 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]生物质材料教育部工程研究中心,四川绵阳621010

出　　处：《化工学报》2015年第5期1939-1946,共8页CIESC Journal

基　　金：国家'十一五'科技支撑计划项目(2007BAE42B04);四川省'2014年科技创新苗子工程'重大项目(2014-17);西南科技大学研究生创新基金项目(14ycx012)~~

摘　　要：采用共沉淀法合成的新型光催化剂(Fe-Sr2Bi2O5)与低密度聚乙烯(LDPE)通过熔融共混制备了一种新型光催化降解复合膜(Fe-Sr2Bi2O5/PE)。通过力学性能、接触角、傅里叶变换红外光谱(FT-IR)和场发射扫描电镜(FESEM)等表征手段研究了该催化剂在室温条件下固相光催化降解LDPE复合膜的性能变化。结果表明:Fe-Sr2Bi2O5在紫外光和可见光条件下对LDPE均具有较好的光催化降解能力,其中,紫外灯照射10 d后,Fe-Sr2Bi2O5/PE复合膜断裂伸长保留率低于5%,拉伸强度保留率低于40%,接触角降低22.52°,已完全脆化;同时,LDPE复合膜中出现明显的羰基等降解特征吸收峰和降解孔洞;与Sr2Bi2O5和Ti O2相比,Fe-Sr2Bi2O5对LDPE具有更好的降解效果。综上所述,在紫外光和可见光条件下,Fe-Sr2Bi2O5对LDPE具有明显的光催化降解作用,为未来光催化降解聚乙烯(PE)提供了一定的新依据。A novel Fe-Sr2Bi2O5 photocatalyst was synthesized with the co-precipitation method and added into a low density polyethylene （LDPE） film. The solid-phase photocatalytic degradation behavior of LDPE composite film under UV and visible light irradiation at room temperature was investigated and compared with the pure LDPE film, CaCO3/PE,Sr2Bi2O5/PE and TiO2/PE composite films,and the obtained sample were characterized with contact angle, Fourier transform infrared spectroscopy （FT-IR） and field emission scanning electron microscopy （FESEM）, including the analyses for the mechanical properties of reserved elongation at break and reserved tensile strength. Fe-Sr2Bi2O5 had a high photocatalytic activity in degrading LDPE under UV light and visible light irradiation. After UV light irradiation for 10 d, reserved elongation at break and reserved tensile strength were lower than 5% and 40%, respectively; while contact angle was reduced by 22.52°. At the same time, carbonyl groups were detected in LDPE composite films and there were holes on the surface of LDPE around Fe-Sr2Bi2O5. Fe-Sr2Bi2O5 made photodegradation of LDPE more effective compared with Sr2Bi2O5 and TiO2 under UV or visible light degradation. In conclusion, LDPE could be degraded obviously by Fe-Sr2Bi2O5 under UV and visible light irradiation at room temperature, and Fe-Sr2Bi2O5 could be a new photocatalyst for photocatalytic degradation of polyethylene film in the future.

关 键 词：Fe-Sr2Bi2O5 催化 降解 聚乙烯 接触角 自由基 

分 类 号：TB324[一般工业技术—材料科学与工程]