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首页> 外文会议>International Conference on Material Science, Energy and Environmental Engineering >A Novel Metal-Free Visible-Light-Driven Photo catalytic Foam for Efficient Degradation of Methyl Orange
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A Novel Metal-Free Visible-Light-Driven Photo catalytic Foam for Efficient Degradation of Methyl Orange

机译：一种新型金属可见光灯驱动光催化泡沫，用于高效降解甲基橙

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Here, graphitic carbon nitride (g-C_3N_4) was integrated with polyurethane foam (PUF) as a novel metal-free visible-light-driven photocatalytic foam (g-C_3N_4/PUF) by a facile ultrasonic method. The fabricated samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray Diffractometry (XRD) and UV-Vis diffuse reflectance spectroscopy (UV-V_(is) DRS). This composite foam exhibited enhanced photocatalytic performance compared to g-C_3N_4 powders for degradation of methyl orange (MO) in water without stirring under visible light irradiation. The pseudo-first order rate constant (kobs) for MO photodegradation by g-C_3N_4/PUF increased by up to a factor of 4.5 when compared with that of g-C_3N_4. The optimal addition dosage of g-C_3N_4 precursors for 1 cm~3 PUF was determined to be 0.5 g, namely g-C_3N_4/PUF-5. The new foam maintained its photocatalytic activity at least five consecutive cycles. Specially, the photocatalytic mechanism of g-C_3N_4/PUF was revealed, and superoxide radicals (·O_(2-)) were found to play a more dominant role than hydroxyl radicals (·OH) for organic pollutant degradation.
机译：这里，通过容易超声方法与聚氨酯泡沫（PUF）作为新型无金属可见光型光催化泡沫（G-C_3N_4 / PUF）整合石墨碳氮化物（G-C_3N_4）。通过扫描电子显微镜（SEM），透射电子显微镜（TEM），X射线衍射术（XRD）和UV-VI扩散反射光谱（UV-V_（IS）DRS）来表征制造的样品。与G-C_3N_4粉末相比，该复合泡沫表现出增强的光催化性能，用于在水中的甲基橙（Mo）降解甲基橙（Mo）而不在可见光照射下搅拌。与G-C_3N_4相比，G-C_3N_4 / PUF的MO光电降解的伪第一阶速率常数（KOB）通过G-C_3N_4 / PUF增加到4.5因子。将G-C_3N_4前体的最佳添加剂量为1cm〜3 puf的最佳添加剂量为0.5g，即G-C_3N_4 / PUF-5。新泡沫保持其光催化活性至少五个连续循环。特别地，揭示了G-C_3N_4 / Puf的光催化机制，发现超氧基自由基（·O_（2-））比羟基自由基（·oh）发挥更大的作用，用于有机污染物降解。

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