Synthesis and evaluation of highly dispersible and efficient photocatalytic TiO2/poly lactic acid nanocomposite films via sol-gel and casting processes
Synthesis and evaluation of highly dispersible and efficient photocatalytic TiO2/poly lactic acid nanocomposite films via sol-gel and casting processes
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通过溶胶-凝胶和浇铸工艺合成和评价高分散高效光催化TiO2/聚乳酸纳米复合材料
DOI：
10.1016/j.ijfoodmicro.2020.108763
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发表时间：
2020-10-16
影响因子：
5.4
通讯作者：
Chen, Ye
中科院分区：
文献类型：
--
作者：
Li, Shuhong;Chen, Guiyun;Chen, Ye
以四异丙氧基钛（TTIP）为水解原料，采用溶胶-凝胶法合成了6.3-11.1 nm的二氧化钛（TiO 2）纳米粒子，并通过流延法制备了聚乳酸（PLA）/TiO 2纳米复合薄膜。研究了TiO 2添加量对PLA/TiO 2纳米复合膜结构和性能的影响。这些结果表明，通过溶胶-凝胶和流延工艺可以避免TiO 2纳米粒子在聚乳酸薄膜中的自聚集。TiO 2的存在显着提高了薄膜的拉伸强度和热稳定性。PLA/TiO 2（0.6wt%）薄膜在紫外光照射下表现出最高的光催化活性效率，并表现出较高的抗菌活性，其中对金黄色葡萄球菌的抑菌圈最大，其次是对大肠杆菌的抑菌圈最小。这项研究表明，聚乳酸/二氧化钛纳米复合薄膜可能是一个有前途的抗菌替代材料，传统的塑料包装。
Using titanium teraisopropoxide (TTIP) as the hydrolysis material, titanium dioxide (TiO2) (6.3-11.1 nm) nanoparticles were synthesized via the sol-gel method and reinforced into poly lactic acid (PLA)/TiO2 nanocomposite films by casting. The effect of increasing amounts of TiO2 on the structure and properties of PLA/TiO2 nanocomposite films were evaluated. These results indicated that self-aggregation of TiO2 nanoparticles in PLA films could be avoided via sol-gel and casting processes. The presence of TiO2 significantly improved the tensile strength and thermal stability of films. The PLA/TiO2 (0.6 wt%) film exhibited the highest photocatalytic activity efficiency under UV irradiation and displayed high antibacterial activities with optimal inhibition zones of Staphylococcus aureus, followed by Escherichia dispersibility of TiO2 in films were responsible for those improvements. This study suggests that PLA/TiO2 nanocomposite films could be a promising antimicrobial alternative material to conventional plastic packages.