聚乙烯是市面上最常見的塑膠產品，由於其低成本以及穩定的化學、物理性質，聚乙烯產品被廣泛應用於各種領域，當人們享受著聚乙烯給予的便利時，聚乙烯的廢棄物也造成嚴重的環境問題，根據聯合國的資料統計，聚乙烯在自然的情況下需要100年的時間才能自行分解，因此聚乙烯廢棄物的處理已成為世界關注的環境議題。TiO2為一常見的光觸媒，被廣泛的使用於塑料的光降解，不過降解效率不佳卻是TiO2一直以來需要改善的問題，現行的研究中不乏提升TiO2光降解效率之內容，以目前的研究來說，大多針對TiO2的改質進行討論，不過改質TiO2的同時卻也使整體的研究製程變得非常冗長，因此本研究致力於開發出一種簡便的方式提高聚乙烯的光降解效率。
為了達成簡化製程以及提高聚乙烯光降解效率的目的，本研究參考了TiO2光降解機制，發現OH-能夠和TiO2產生的電洞反應，生成·OH降解聚乙烯，因此本研究引入了固態鹼的概念，將TiO2和固態鹼以混合法和熱壓法製作聚乙烯薄膜，提高聚乙烯的光降解效率，研究首先使用NaOH評估鹼性條件於TiO2光降解系統的降解表現，實驗結果顯示，添加1%TiO2的LDPE樣品浸泡在5M的NaOH水溶液中，經過800小時254 nm的UV光照射，重量損失達87%，相比於未浸泡之1%TiO2的LDPE樣品重量損失為55.72%，證實了本光降解策略的可行性，接著，本研究將原本滴落塗佈法的製膜方式改成熱壓法，大幅簡化實驗製程，並且引進新的鹼性降解助劑K2CO3，本組實驗還將薄膜增厚，以符合商用聚乙烯產品規格，結果顯示添加K2CO3以及5% TiO2的聚乙烯在照光1600小時之後，樣品重量損失達64%，相較於未添加K2CO3之樣品重量損失為54%，此結果再次證明本光降解策略的可行性，並且僅需要使用簡單的混合法以及熱壓法就能達成，除了降解實驗用的LDPE之外，本研究還對商用的HDPE、PBS、PET、PU以及Nylon等塑膠材料進行光降解的測試，都產生良好的降解效果，證明了本研究廣泛的應用性，未來預計將應用範圍從紫外光觸媒拓展至可見光觸媒之範疇，繼續提升本光降解策略的應用。

Polyethylene is the most common plastic product on the market. Its widespread use in various fields is attributed to its low cost and stable chemical and physical properties. However, polyethylene products also lead to serious environmental issues. According to the United Nations, polyethylene takes at least 100 years to degrade. As a result, the disposal of polyethylene waste has become a globally environmental issue. Titanium dioxide(TiO2) is a commonly used photocatalyst and is widely applied in the photodegradation of plastics. However, a limitation with TiO2 is its low degradation efficiency. In order to overcome this limitation, this study aims to develop a simple method to enhance the photodegradation efficiency of polyethylene.
This study referenced the photocatalytic degradation mechanism of TiO2 and found that OH- can react with the photo-generated holes on TiO2, leading to the formation of ·OH that degrade polyethylene. Therefore, this study introduced solid base into the TiO2 photocatalytic system to degrade polyethylene. In the experiment, the LDPE sample containing 1% TiO2 was first soaked in a 5M NaOH aqueous solution. After exposing 800 hours UV light, the weight loss reached 87%. In comparison, the weight loss of the samples not soaked in the solution was 55.72%. This confirmed the feasibility of the photocatalytic degradation strategy in this study. Furthermore, in this study, the original drop-casting method for film fabrication was replaced with a hot-pressing technique, which significantly simplified the experimental process. In order to prepare PE film by hot-pressing, another alkaline degradation agent, K2CO3, was introduced. The experimental results demonstrated that the LDPE sample with the addition of 5% TiO2 and K2CO3 showed a weight loss of 64% after 1600 hours of UV light exposure. In comparison, the weight loss of the samples without K2CO3 was 54%. This result further confirmed that TiO2 could effectively enhance the photodegradation of polyethylene under alkaline conditions. Moreover, it demonstrated that achieving this enhancement only required simple process. Finally, this study also conducted photodegradation tests on various plastic materials such as HDPE, PBS, PET, PU, and Nylon. All of them showed good degradation effects and demonstrated the applicability of this research. In the future, the plan is to utilize visible light catalysts to further expand the application range of this photocatalytic degradation strategy.

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