Melamine-formaldehyde (MF) resin, one of the thermoset plastics, has been widely used due to its own characteristics such as hardness, thermal resistance, scratch resistance, and so on. However, due to those physical properties, it is hard to recycle after it is used. In this study, we developed a new experimental approach to recycle after-use MF resin as an enhancer for synthesizing g-C₃N₄ photocatalysts. By adding the optimized amount of MF resin during the thermal synthesizing process of g-C₃N₄ from urea, the melamine-formaldehyde resin added g-C₃N₄ photocatalysts (MR photocatalysts) showed 2 times increased photocatalytic efficiency measured by the degradation reaction of methyl orange (MO) compared with the pristine g-C₃N₄ photocatalyst. As fabricated photoelectrodes with the above photocatalysts, the optimized MR photocatalysts showed 141% enhanced photoelectrochemical properties with decreased electrochemical impedance values and onset potentials (V_onset). The underlying photocatalytic/photoelectrochemical properties of the MR photocatalysts associated with the catalytic efficiency were investigated by employing various characterization methods including XPS, UV–visible, and TRPL measurements.

中文翻译：

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回收废三聚氰胺甲醛树脂作为 g-C3N4 光催化剂的光催化增强剂及其在光电化学（PEC）反应中的应用

三聚氰胺甲醛（MF）树脂是热固性塑料之一，由于其自​​身硬度、耐热性、耐刮擦性等特点而得到广泛应用。然而，由于这些物理特性，使用后很难回收。在这项研究中，我们开发了一种新的实验方法来回收使用后的 MF 树脂作为合成 gC ₃ N ₄光催化剂的增强剂。通过在尿素热合成gC ₃ N ₄过程中添加优化量的MF树脂，通过甲基橙的降解反应测量，添加gC ₃ N ₄光催化剂（MR光催化剂）的三聚氰胺甲醛树脂的光催化效率提高了2倍(MO) 与原始 gC ₃ N ₄光催化剂相比。使用上述光催化剂制造的光电极时，优化后的 MR 光催化剂的光电化学性能提高了 141%，同时电化学阻抗值和起始电位 ( V _onset ) 降低。通过采用包括 XPS、紫外可见光和 TRPL 测量在内的各种表征方法，研究了与催化效率相关的 MR 光催化剂的基本光催化/光电化学特性。