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首页> 外文期刊>Journal of Applied Polymer Science >Alkaline Fungal Degradation of Oxidized Polyethylene in Black Liquor: Studies on the Effect of Lignin Peroxidases and Manganese Peroxidases
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Alkaline Fungal Degradation of Oxidized Polyethylene in Black Liquor: Studies on the Effect of Lignin Peroxidases and Manganese Peroxidases

机译：黑液中氧化聚乙烯的碱性真菌降解：木质素过氧化物酶和锰过氧化物酶的作用研究

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High-molecular-weight polyethylene is resistant to natural environmental degradation for its crystalline, hydrophobic structure. In this study, waste polyethylene bags are chemically oxidized at 80℃ for 5 days by potassium dichromate solutions of various concentrations along with sulfuric acid. Absorbance peaks of carbonyl and carboxylate ions in the Fourier transform infrared spectroscopy spectra and formation of amorphous phase from crystalline one as indicated in X ray diffraction studies of oxidized polyethylenes indicate the formation of a polar hydrophilic and low-molecular-weight material after oxidation. From the scanning electron microscopy studies, it is observed that reacted polyethylene surface is disintegrated and numerous fissures are formed throughout the surface. The respective weight loss of incubated oxidized polyethylene with Phanerochaete chrysosporium (MTCC-787) after 15 days of incubation is 70%, respectively, in black liquor–glucose–malt extract medium. As both lignin peroxidase (LiP) and manganese peroxidase (MnP) were detected in this media, further degradation of oxidized polyethylene is carried out in four different media with varying amount of N and Mn. The weight loss is observed only in media with excess nitrogen (N) and limited manganese (Mn), the condition which enhances the presence of LiP and MnP. This indicates that these enzymes are essential for degradation of lignin as well as oxidized polyethylene. UV spectroscopic studies indicate 40% decrease in the lignin concentration. This process of fungal degradation of chemically oxidized polyethylene using black liquor is very quick compared to the other related studies, leading to the simultaneous degradation of two waste materials, polyethylene and black liquor.
机译：高分子量聚乙烯的结晶疏水结构可抵抗自然环境降解。在这项研究中，废聚乙烯袋在80℃下被各种浓度的重铬酸钾溶液和硫酸化学氧化5天。氧化聚乙烯的X射线衍射研究表明，傅里叶变换红外光谱图谱中的羰基和羧酸根离子的吸收峰以及由结晶态的非晶态形成，表明氧化后形成了极性亲水性和低分子量材料。从扫描电子显微镜研究中，观察到反应的聚乙烯表面分解并且在整个表面上形成许多裂缝。在黑液-葡萄糖-麦芽浸出液中孵育15天后，与Phanerochaete chrysosporium（MTCC-787）一起孵育的氧化聚乙烯的失重分别为70％。由于在这种介质中都检测到了木质素过氧化物酶（LiP）和锰过氧化物酶（MnP），因此在四种不同N和Mn含量不同的介质中，氧化聚乙烯会进一步降解。仅在具有过量氮（N）和有限锰（Mn）的介质中观察到失重，这种条件会增强LiP和MnP的存在。这表明这些酶对于木质素和氧化聚乙烯的降解至关重要。紫外光谱研究表明木质素浓度降低了40％。与其他相关研究相比，使用黑液进行化学氧化聚乙烯的真菌降解过程非常快，从而导致了两种废料（聚乙烯和黑液）的同时降解。

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