首先以聚乳酸(PLA)为成膜材料,采用水蒸汽辅助法制备了PLA多孔薄膜。利用电子显微镜(EM)和扫描电子显微镜(SEM)研究了有机溶剂、铸膜液浓度、环境湿度和表面活性剂等因素对多孔膜结构和形貌的影响;然后在铸膜液中添加TiO2制备了PLA/TiO2复合膜,采用SEM和X-射线衍射仪(XRD)对其表面形貌和结构进行表征,采用分光光度计评价了PLA/TiO2复合多孔膜对亚甲基蓝染料的光催化降解性能。结果表明:水蒸汽辅助法制备PLA多孔膜的最佳条件为以CH2Cl2为溶剂、PLA质量浓度3%、环境湿度为83%、不添加表面活性剂;TiO2的加入降低了多孔膜的有序性,使得PLA的结晶度略有降低,晶粒尺寸略有减小,复合膜对亚甲基蓝的光催化降解效果较好。
Polylactic acid (PLA) was chosen as raw materials and PLA porous films were prepared by breath figure (BF) method.The influences of different organic solvent,casting solution concentration,environmental humidity and surfactant on the structure and morphology of films were studied by electron microscopy (EM) and scanning electron microscopy (SEM).Then the PLA/TiO2 composite films were prepared by adding TiO2 nanoparticles into PLA casting solution.The surface morphology and structure were characterized by SEM and X-ray diffraction (XRD).The spectrophotometer was employed to evaluate the photocatalytic degradation properties of PLA/TiO2 on methylene blue dye.The optimum experimental conditions for the preparation of PLA porous film by BF were using CH2Cl2 as solvent,PLA mass concentration was 3%,ambient humidity was 83%,and no addition of surfactant.The addition of TiO2 decreased the pore regularity of PLA porous film,the crystallinity of PLA and the grain size.The PLA/TiO2 composite film had good photocatalytic degradation efficiency on methylene blue dye.
[1] 孟范平,易怀昌.各种吸附材料在印染废水处理中的应用[J].材料导报,2009,23(13):69-73.
[2] 任南琪,周显娇,郭婉茜等.染料废水处理技术研究进展[J].化工学报,2013,64(1):84-94.
[3] 胡春光,辛伟,李俊良.铁锰复合氧化物吸附偶氮染料酸性红B的性能研究[J].科学技术与工程,2009,9(10):2692-2697.
[4] 王爱民,杨立红,张素娟,等.电化学方法治理含染料废水的现状与进展[J].工业水处理,2001,21(8):4-7.
[5] 聂冬,金明姬,董微巍,等.高级氧化法在水处理领域中的应用研究[J].延边大学农学学报,2014,36(2):179-185.
[6] 张旋,王启山.高级氧化技术在废水处理中的应用[J].水处理技术,2009,35(3):18-21.
[7] 韩世同,习海玲,史瑞雪,等.半导体光催化研究进展与展望[J].化学物理学报,2003,16(5):339-349.
[8] 李静谊,斯琴高娃,刘丽娜.TiO2/膨润土光催化降解有机污染物[J].物理化学学报,2007,23(1):16-20.
[9] Hsich T M,Benjamin C W,Narayanan K,et al.Three-dimensional micro-structured tissue scaffolds fabricated by two-photon laser scanning photolithography[J].Biomaterials,2010,31(30):7648-7652.
[10] Vozzi G,Flaim C,Ahluwalia A,et al.Fabrication of PLGA scaffolds using soft lithography and microsyringe deposition[J].Biomaterials,2003,24(14):2533-2540.
[11] 汪昊.聚乳酸复合材料的制备及性能[D].广州:华南理工大学,2013.
[12] Ozkoc G,Kemaloglu S.Morphology,biodegradability,mechanical,and thermal properties of nanocomposite films based on PLA and plasticized PLA[J].Journal of Applied Polymer Science,2009,114(4):2481-2487.
[13] He G F,Cai Y B,Zhao Y,et al.Electrospun anatase-phase TiO2 nanofibers with different morphological structures and specific surface areas[J].Journal of Colloid and Interface Science,2013,398:103-111.
基金资助
中央高校基本科研业务费专项资金资助项目(JUSRP51621A);江苏高校“青蓝工程”优秀青年骨干教师培养对象资助项目(2016[15]);江苏省双创计划项目(2015[26]);江苏省研究生科研与实践创新计划项目(KYCX17-1472)
PDF
(7771KB)
