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首页> 外文期刊>Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology >Synthesis of bulk and nanoporous carbon nitride polymers from ammonium thiocyanate for photocatalytic hydrogen evolution
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Synthesis of bulk and nanoporous carbon nitride polymers from ammonium thiocyanate for photocatalytic hydrogen evolution

机译：由硫氰酸铵合成本体和纳米孔氮化碳聚合物用于光催化制氢

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Graphitic carbon nitride was synthesized by direct thermal polymerization of ammonium thiocyanate as the precursor. The transfer of this simple thermal-induced polymerization onto hard-templates with various nanoarchitectures enables the fabrication of nanostructured carbon nitrides via a soft-chemical synthesis, while the involvement of a sulfur species within the reaction cascade offers additional chemical control of the texture and the electronic structures. The catalysts were subjected to several characterizations, and the results obtained revealed that nanoporous carbon nitrides can be obtained by templating with nanosized silica and SBA-15. Photocatalytic activity was evaluated toward hydrogen evolution from proton solution with visible light. Results show that g-C3N4 synthesized from ammonium thiocyanate exhibited improved photoactivity in comparison with g-C3N4 obtained from dicyandiamide. Further improvement in the activity was achieved by creating the nanostructures in g-C3N4. This is due to the enhanced surface area obtained which is favorable for light-harvesting and mass-transfer, as well as to the increased redox potential.
机译：通过以硫氰酸铵为前驱体进行直接热聚合，合成了石墨碳氮化物。这种简单的热诱导聚合反应转移到具有各种纳米结构的硬模板上，就可以通过软化学合成来制造纳米结构的碳氮化物，而反应级联中硫原子的参与提供了对结构和结构的额外化学控制。电子结构。对该催化剂进行了几次表征，所得结果表明，通过用纳米级二氧化硅和SBA-15进行模板化可以制得纳米多孔碳氮化物。评价了在可见光下从质子溶液向氢放出的光催化活性。结果表明，与从双氰胺获得的g-C3N4相比，由硫氰酸铵合成的g-C3N4表现出改善的光活性。通过在g-C3N4中形成纳米结构，可以进一步提高活性。这是由于获得的表面积增加，有利于光的收集和传质以及氧化还原电位的增加。

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