在处理了2 d之后,PET塑料瓶被降解,其产物对苯二甲酸的产率达到88%,且降解过程中没有产生黏性的副产物(图3)。通过此反应器对PET的降解效率比传统管式操作效率提高了54800倍[14]。值得注意的是,虽然降解过程中用到了含U催化剂,但238U元素不同于其他U的同位素(如234U和235U),其占据了U元素总量的99.28%,但是放射性很低;通过对降解产物进行元素分析发现,降解产物中也并无238U元素残留。因此,该研究团队提出的降解反应无放射性毒害。以上特点说明了此研究方案的可行性,为进一步实现塑料制品在复杂真实场景下的降解提供了可能,为推进塑料降解的实际应用提供了助力。该工作实现了对聚苯乙烯类、聚酯类塑料的降解过程研究,提出了SET、HAT、OAT耦合的降解机理,并实现了公斤级塑料产品的降解,获得了较高产率的单体原料,为进一步深化降解机理研究提供了新的方法,为实现塑料制品的可持续管理以及塑料污染治理提供了有效的方案。
二、PET有哪些应用?
PET塑料在较宽的温度范围内具有优良的物理机械性能,长期使用温度可达120℃,电绝缘性优良,甚至在高温高频下,其电性能仍较好,因而广泛应用于各领域。
1、薄膜片材方面:各类食品、药品、无毒无菌的包装材料;纺织品、精密仪器、电器元件的包装材料;录音带、录象带、电影胶片、计算机软盘、金属镀膜及感光胶片等的基材;
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