Laboratorio de Microbiología Ambiental y Suelos, Grupo de Biotecnología Ambiental e Industrial (GBAI), Departamento de Microbiología, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, DC 110-23, Colombia.
Grupo de Películas Delgadas y Nanofotónica, Departamento de Física, Facultad de Ciencias, Pontificia Universidad Javeriana, Bogotá, DC 110-23, Colombia.
Molecules. 2021 Apr 26;26(9):2513. doi: 10.3390/molecules26092513.
Low-density polyethylene (LDPE) sheets (3.0 ± 0.1 cm) received sequential treatment, first by the action of direct-current low-pressure plasma (DC-LPP) with a 100% oxygen partial pressure, 3.0 × 10 mbar pressure, 600 V DC tension, 5.6 cm distance, 6-min treatment. Then, sheets were submitted to TiO photocatalysis at UV radiation at 254 nm (TiO/UV) with a pH value of 4.5 ± 0.2 and a TiO concentration of 1 gL. We achieved a complementary effect on the transformation of LDPE films. With the first treatment, ablation was generated, which increased hydrophilicity. With the second treatment, the cavities appeared. The changes in the LDPE sheets' hydrophobicity were measured using the static contact angle (SCA) technique. The photocatalytic degradation curve at 400 h revealed that the DC-LPP photocatalysis sequential process decreased SCA by 82°. This was achieved by the incorporation of polar groups, which increased hydrophilicity, roughness, and rigidity by 12 and 38%, respectively. These sequential processes could be employed for LDPE and other material biodegradation pretreatment.
低密度聚乙烯（LDPE）片（3.0±0.1cm）依次进行处理，首先在 100%氧气分压、3.0×10 毫巴压力、600V 直流电压、5.6cm 距离、6 分钟处理时间的直流低压等离子体（DC-LPP）作用下处理。然后，将薄片置于 254nm 的紫外辐射下进行 TiO 光催化（TiO/UV），pH 值为 4.5±0.2，TiO 浓度为 1gL。我们在 LDPE 薄膜的转化上实现了协同作用。第一种处理方式产生了烧蚀，增加了亲水性。第二种处理方式则产生了凹坑。采用静态接触角（SCA）技术测量 LDPE 片材疏水性的变化。400 小时的光催化降解曲线表明，DC-LPP 光催化顺序过程使 SCA 降低了 82%。这是通过引入极性基团实现的，亲水性、粗糙度和刚性分别增加了 12%和 38%。这些顺序过程可用于 LDPE 和其他材料的生物降解预处理。
