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首页> 外文期刊>RSC Advances >Biotic oxidation of polyethylene using a bio-surfactant produced by B-licheniformis: a novel technique
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Biotic oxidation of polyethylene using a bio-surfactant produced by B-licheniformis: a novel technique

机译：使用B-地衣菌产生的生物表面活性剂对聚乙烯进行生物氧化：一种新技术

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Polyethylene was incubated with a bio-surfactant producing bacterium B. licheniformis for 2 months in a suitable media. Low concentrations of NaCl were added to study its effect on the bio-surfactants activity. Being amphiphilic, the surfactant has a unique ability to decrease the surface energy, and this decrease measured using the surface tension of the medium was 50%. The surfactant was able to oxidize both control (unoxidized) and pre-oxidized polyethylene during incubation. The oxidation level of the control polyethylene sample was increased in the presence of NaCl, and the oxidation level was higher in the presence of 1% NaCl as compared to that found with 0.5% NaCl. A higher amount of surfactant was also produced, as observed by the comparatively low surface tension in the presence of NaCl. During the bio-oxidation of polyethylene, higher amounts of unsaturated hydrocarbons were formed as compared to carbonyl groups. This oxidation was also observed through the reduced crystalline property and cracked polyethylene surface using SEM. It was also observed that the product formed during the oxidation by the bio-surfactant could be solubilised into liquid media. For this rapid loss of oxidation product, a decrease in the mechanical properties of all the treated polyethylene samples was observed, and this deterioration was highest in the case of the pre-oxidised polyethylene incubated with the bio-surfactant for 2 months. In this study, a novel unique method for the bio-oxidation of polyethylene using a bio-surfactant was established.
机译：将聚乙烯与产生生物表面活性剂的地衣芽孢杆菌在合适的培养基中孵育2个月。添加低浓度的氯化钠以研究其对生物表面活性剂活性的影响。表面活性剂是两亲性的，具有独特的降低表面能的能力，并且使用介质的表面张力测得的该降低为50％。在孵育过程中，表面活性剂能够氧化对照（未氧化）和预氧化的聚乙烯。与0.5％NaCl相比，在NaCl存在下，对照聚乙烯样品的氧化水平增加，在1％NaCl存在下，氧化水平更高。如在NaCl存在下相对较低的表面张力所观察到的，还产生了较高量的表面活性剂。在聚乙烯的生物氧化过程中，与羰基相比，形成了大量的不饱和烃。还使用SEM通过降低的结晶性和破裂的聚乙烯表面观察到该氧化。还观察到生物表面活性剂在氧化过程中形成的产物可以溶解在液体介质中。对于这种氧化产物的快速损失，观察到所有处理过的聚乙烯样品的机械性能均下降，并且在将预氧化聚乙烯与生物表面活性剂孵育2个月的情况下，这种劣化最大。在这项研究中，建立了一种新颖的独特方法，可使用生物表面活性剂对聚乙烯进行生物氧化。

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