随着技术的成熟和成本的持续降低，发光二极管（LED）已经占据了大部分照明市场。作为一种新型的电子废弃物，LED是一把双刃剑，因为它不仅含有贵金属和稀有金属，还含有有机封装材料。在之前的研究中，LED回收主要集中在回收贵重和战略性金属，而忽略了有机封装材料等有害物质。与破碎和其他传统方法不同，水热处理可以为分解封装材料提供一个环境友好的过程。本工作开发了一种封闭式反应容器，其中塑料聚邻苯二甲酰胺（PPA）的降解率接近100%，塑料PPA中封装的纳米二氧化钛被有效回收，同时LED中含有的金属也被有效回收。此外，本工作详细探讨和推测了当前研究中被忽视的水在塑料PPA降解中的作用。环境影响评价显示，与目前公布的过程相比，文中提出的废弃LED的回收路线可以显著降低整体环境影响。特别是开发的方法可以减少一半以上的全球变暖的影响。此外，本研究为回收其他塑料封装的电子废弃物设备，如集成电路，提供了理论基础和有前景的方法。

Light emitting diodes (LEDs) have accounted for most of the lighting market as the technology matures and costs continue to reduce. As a new type of e-waste, LED is a double-edged sword, as it contains not only precious and rare metals but also organic packaging materials. In previous studies, LED recycling focused on recovering precious and strategic metals while ignoring harmful substances such as organic packaging materials. Unlike crushing and other traditional methods, hydrothermal treatment can provide an environment-friendly process for decomposing packaging materials. This work developed a closed reaction vessel, where the degradation rate of plastic polyphthalamide (PPA) was close to 100 \mathrm{\%}, with nano- {\mathrm{T}\mathrm{i}\mathrm{O}}_2 encapsulated in plastic PPA being efficiently recovered, while metals contained in LED were also recycled efficiently. Besides, the role of water in plastic PPA degradation that has been overlooked in current studies was explored and speculated in detail in this work. Environmental impact assessment revealed that the proposed recycling route for waste LED could significantly reduce the overall environmental impact compared to the currently published processes. Especially the developed method could reduce more than half the impact of global warming. Furthermore, this research provides a theoretical basis and a promising method for recycling other plastic-packaged e-waste devices, such as integrated circuits.