本研究針對可見光下苯乙烯之光催化降解進行探討，並以摻雜鎂（Mg）的石墨氮化碳作為光催化劑。藉由調整Mg摻雜比例（0.01–0.5 wt%）合成系列催化劑，並且利用XRD、XPS、TEM、BET、PL、EPR等儀器進行材料分析。結果顯示，0.05 wt% Mg/g-C₃N₄樣品表現最佳，其擁有最低的光致發光強度與最高的超氧自由基（•O₂⁻）與單態氧（¹O₂）產生能力。反應參數方面，溫度與苯乙烯濃度上升可有效提升反應速率，而相對濕度增加則因水分子競爭吸附而降低降解效率。在循環實驗中，此催化劑仍可維持超過80%初始效率，展現良好穩定性。反應動力學以Langmuir-Hinshelwood模型模擬最為合適，經過計算獲得表觀活化能為24.9 kJ/mol。最終藉由自由基抑制與GC-MS分析，確認反應主要經由•O₂⁻與¹O₂進行，中間產物包含formic acid ethyl ester、1,4-dioxane及acetone等。整體而言，本研究所開發之Mg摻雜g-C₃N₄具備優異的苯乙烯降解效能與再利用潛力，為VOCs處理提供可行性方案。

This study investigates the photocatalytic degradation of styrene under visible light using magnesium-modified graphitic carbon nitride (Mg/g-C₃N₄) as the catalyst. A series of catalysts with varying Mg doping ratios (0.01–0.5 wt%) were synthesized and characterized by XRD, XPS, TEM, BET, PL, and EPR techniques. Among them, 0.05 wt% Mg/g-C₃N₄ exhibited superior photocatalytic activity, with the lowest photoluminescence intensity and the highest generation of superoxide (•O₂⁻) and singlet oxygen (¹O₂). Experimental results revealed that higher temperatures and styrene concentrations enhanced the reaction rate, while increased humidity suppressed the efficiency due to competitive adsorption. The catalyst maintained over 80% of its original performance after six cycles, confirming good stability and reusability. Kinetic modeling based on the Langmuir-Hinshelwood mechanism yielded an apparent activation energy of 24.9 kJ/mol. Reactive species trapping and GC-MS analysis revealed that the degradation proceeded primarily through •O₂⁻ and ¹O₂ pathways, generating intermediates such as formic acid ethyl ester, 1,4-dioxane, and acetone. This work demonstrates that Mg/g-C₃N₄ is a promising candidate for efficient and reusable VOCs photodegradation under visible light.

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