Photocatalytic use of the neat graphitic carbon nitride, g-C₃N₄, is usually restricted by unsatisfactory efficiency due to low solar light absorption and rapid recombination of photogenerated charge carriers. The introduction of metal ions into g-C₃N₄ structure can effectively reduce the recombination rate of photogenerated charges, expand the light absorption range and in consequence improve overall photocatalytic efficiency. The series of graphitic carbon nitride based materials, doped with metals cations (iron, bismuth, cobalt, zinc), has been prepared. The doping-caused changes of band gap energy, flat band potential, photocurrent generation, and photoactivity range have been studied using spectroscopic and electrochemical techniques. Moreover, based on the photocatalytic activity tests the efficiency of change recombination has been estimated. Presented studies proved multifarious positive effects of doping on g-C₃N₄, such as extended light absorption, an improved yield of electron–hole pairs separation, suppressed recombination of charge carriers, reduced electron transport resistance, and improved photocatalytic efficiency of dye decomposition.

中文翻译：

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掺杂的石墨碳氮化物：来自光谱学和电化学的见解

净石墨碳氮化物gC ₃ N _4的光催化使用通常由于太阳光吸收低和光生电荷载流子的快速重组而受到不令人满意的效率的限制。将金属离子引入gC ₃ N ₄这种结构可以有效地降低光生电荷的复合率，扩大光吸收范围，从而提高整体光催化效率。已经制备了一系列掺杂有金属阳离子（铁，铋，钴，锌）的石墨氮化碳基材料。使用光谱和电化学技术研究了掺杂引起的带隙能，平带电势，光电流产生和光活性范围的变化。而且，基于光催化活性测试，已经估计了改变重组的效率。已有研究证明掺杂对gC ₃ N _4有多种积极作用例如，延长的光吸收，提高的电子-空穴对分离产率，抑制的载流子复合，降低的电子传输阻力以及提高的染料分解光催化效率。