Singh Sukhjinder, Sharma Shelja, Umar Ahmad, Mehta Surinder Kumar, Bhatti Manpreet Singh, Kansal Sushil Kumar
Dr. S. S. Bhatnagar University Institute of Chemical Engineering and Technology, Panjab University, Chandigarh 160014, India.
Department of Chemistry and Centre of Advanced Studies, Panjab University, Chandigarh 160014, India.
J Nanosci Nanotechnol. 2018 Aug 1;18(8):5804-5809. doi: 10.1166/jnn.2018.15363.
Poly(ethylene terephthalate) (PET) is a versatile engineering plastic which exhibits exceptional mechanical and thermal properties. Huge amounts of PET are consumed in various industries such as food packaging industry, textile industry, in the manufacturing of audio, video tapes and X-ray films and so on. But due to its substantial fraction by volume in water bodies and its high persistence to the atmospheric and biological agents, it could be considered as a hazard substance. Thereby chemical recycling of PET serves as a solution to solid waste problem as it transforms PET into its monomers via hydrolysis. Chemical recycling of post consumed waste PET bottles via alkaline hydrolysis is the main aim of this paper. Operating parameters such as reaction time and temperature were optimized for the conversion of PET into nanospindle-shaped terephthalic acid (TPA). Depolymerization of PET was carried out via alkaline hydrolysis by varying reaction time and temperature and maximum yield of 92% was obtained at 200 °C with reaction time of 25 minutes. The formed TPA nanospindles were further characterized in detail which exhibited high crystallinity, purity and fascinating thermal and surface properties.
聚对苯二甲酸乙二酯（PET）是一种用途广泛的工程塑料，具有出色的机械和热性能。PET在食品包装行业、纺织行业、音频和录像带以及X光片制造等各种行业中大量使用。但由于其在水体中的体积占比很大，并且对大气和生物介质具有高持久性，它可被视为一种有害物质。因此，PET的化学回收作为解决固体废物问题的一种方法，通过水解将PET转化为其单体。通过碱性水解对消费后废弃PET瓶进行化学回收是本文的主要目的。对反应时间和温度等操作参数进行了优化，以将PET转化为纳米纺锤形对苯二甲酸（TPA）。通过改变反应时间和温度，通过碱性水解进行PET的解聚，在200℃和25分钟的反应时间下获得了92%的最大产率。对形成的TPA纳米纺锤体进行了进一步详细表征，其表现出高结晶度、纯度以及迷人的热性能和表面性能。
