Abstract：
Biodegradable plastic bags (BPBs), meant for eco-friendly, often inadequately degrade in compost, leading to microplastic pollution. In this study, the effect of Fenton-like reaction with Fe3O4 nanoparticles (NMs) on the plastisphere microorganisms\' evolution and the BPBs\' aging mechanism was revealed by co-composting of food waste with BPBs for 40 days. The establishment of the Fenton-like reaction was confirmed, with the addition of Fenton-like reagent treatments resulting in an increase of 57.67% and 37.75% in H2O2 levels during the composting, compared to the control group. Moreover, the structural characterization reveals that increasing oxygen content continuously generates reactive free radicals on the surface, leading to the formation of oxidative cavities. This process results in random chain-breaking, significantly reducing molecular weights by 39.27% and 38.81%, thus showcasing a deep-seated transformation in the plastic\'s molecular structure. Furthermore, the microbial network suggested that the Fenton-like reaction enriched plastisphere keystone species, thus accelerating the BPBs\' aging. Additionally, the Fenton-like reaction improved compost maturity and reduced greenhouse gas emissions. These results reveal the bio-chemical mechanisms of BPBs aging and random chain-breaking by the Fenton-like reaction, under alternating oxidative/anoxic conditions of composting and provide a new insight to resolve the BPBs\' pollutions.
摘要：
可生物降解的塑料袋（BPB），意味着环保，通常在堆肥中降解不充分，导致微塑料污染。在这项研究中,通过将食物垃圾与BPBs共堆肥40天，揭示了Fenton样反应与Fe3O4纳米颗粒（NMs）对质体微生物进化和BPBs老化机制的影响。确认了类芬顿反应的建立，添加类Fenton试剂处理导致堆肥过程中H2O2水平增加57.67%和37.75%，与对照组相比。此外，结构表征表明，不断增加的氧含量在表面产生反应性自由基，导致氧化腔的形成。这个过程导致随机断链，显著降低分子量39.27%和38.81%，从而展示了塑料分子结构的深层次转变。此外，微生物网络表明，类Fenton反应富集了plastitpherekeystone物种，从而加速BPB的老化。此外,类似Fenton的反应提高了堆肥的成熟度并减少了温室气体的排放。这些结果揭示了类Fenton反应引起的BPBs老化和随机断链的生化机理,在堆肥的氧化/缺氧交替条件下，为解决BPBs污染提供了新的见解。
