*Graphite Carbon Nitride DOI: http://dx.doi.org/10.5772/intechopen.104976*

proper template, the template method is a versatile methodology for the fabrication of nanostructured or porous materials. In g-C3N4, hard templates [7] are employed to build porous materials and create hierarchical pore topologies. To regulate nanostructures, silica templates are commonly utilized as a structure directing agent. Groenewolt et al. used multiple pore size mesoporous silica matrices to synthesize unique g-C3N4 nanoparticles of different sizes. Many studies on mesoporous g-C3N4 materials made with silica-based hard templates have been published since then. Using aminoguanidine hydrochloride as a precursor and SBA-15 as rigid templates, highly ordered mesoporous g-C3N4 with variable pore sizes was produced. To make ordered porous g-C3N4, Fukasawa et al. employed uniform-sized silica nanospheres as templates. Using guanidinium chloride as a precursor used a nanocasting process to make mesoporous g-C3N4. Two types of pores and high specific surface areas were found in the as-prepared g-C3N4 samples. Park et al. used the incipient wetness method to create 2-dimensional (2D) and 3-dimensional (3D) mesostructured g-C3N4 using mesoporous silica as a hard template. Open pores and a large specific surface area characterize these materials. The hard-template technique, in particular, necessitates the removal of the template in order to get the requisite g-C3N4 structure. This procedure typically uses aqueous NH4HF2 or HF, which can harm the environment (**Figure 2**).
