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首页> 外文期刊>RSC Advances >g-C3N4 synthesized from NH4SCN in a H2 atmosphere as a high performance photocatalyst for blue light-driven degradation of rhodamine B
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g-C3N4 synthesized from NH4SCN in a H2 atmosphere as a high performance photocatalyst for blue light-driven degradation of rhodamine B

机译：G-C3N4从H2大气中的NH4SCN合成，作为罗丹明B的蓝光亮催化剂的高性能光催化剂

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Graphitic carbon nitride (g-C _(3) N _(4) ) was prepared by a simple thermal polymerization method in this work. The effects of precursor type, thermal polymerization temperature, constant temperature time and atmosphere on the crystal structure, morphology, elemental composition, valence distribution, light absorption properties and photocatalytic activity of the prepared photocatalytic materials were investigated. Taking rhodamine B (RhB) as the target degradant, the blue light catalytic activity of the photocatalytic material was studied in detail. The experimental results showed that the final pyrolysis temperature and constant temperature time are positively related to the adsorption characteristics and photocatalytic ability of the prepared materials. In addition, the adsorption capacity and photocatalytic activity of the products obtained in Ar and H _(2) atmospheres are better than those produced in CO and CH _(4) , which can be attributed to the combined effect of large specific surface area and structural defects of the materials. The sample's large specific surface area, wide band gap, and excellent photogenerated carrier separation and transfer capabilities make the adsorption performance and photocatalytic performance of the products obtained with ammonium thiocyanate and thiourea as precursors better than those prepared from melamine and dicyandiamide. g-C _(3) N _(4) prepared by using ammonium thiocyanate as precursor at 550 °C for 5 h under a hydrogen atmosphere showed the best catalytic activity for the degradation of RhB under blue light. It was demonstrated that g-C _(3) N _(4) prepared exhibited good stability and reusability after four repeat experiments. The active components that play major roles in the degradation of RhB described herein were holes and superoxide radicals, which was inferred by free radical trapping experiments. This work provides a theoretical basis for the idea of converting the mixed salts of desulfurization waste liquid containing ammonium thiocyanate into an excellent photocatalyst g-C _(3) N _(4) with visible light response.
机译：通过本工作中的简单热聚合方法制备石墨碳氮化物（G-C _（3））。研究了前体型，热聚合温度，恒温时间和大气对晶体结构，形态，元素组成，价分布，光吸收性能和光催化活性的效果。采用罗丹明B（RHB）作为目标降解，详细研究了光催化材料的蓝光催化活性。实验结果表明，最终热解温度和恒定温度时间与制备材料的吸附特性和光催化能力正相关。此外，Ar和H _（2）型大气中获得的产物的吸附能力和光催化活性优于CO和CH _（4）中产生的产品，其可归因于大特异性表面积和综合影响材料的结构缺陷。样品的大的比表面积，宽带隙和优异的光生载流子分离和转移能力使得用硫氰酸铵和硫脲作为前体获得的产品的吸附性能和光催化性能优于由三聚氰胺和双氰胺制备的产品。通过在氢气氛下在550℃下使用硫氰酸铵作为前体的前体制备的G-C _（4）显示出最佳催化活性，用于在蓝光下降解RHB。证明了在四次重复实验后制备的G-C _（3）N _（4）表现出良好的稳定性和可重用性。在本文所述的RHB的降解中起主要作用的活性组分是孔和超氧化物自由基，由自由基捕获实验推断。这项工作为将含硫氰酸铵的脱硫废液的混合盐转化为具有可见光反应的优异光催化剂G-C_（3）的优异光催化剂G-C_（3）的思想来提供理论依据。

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