ABSTRACT

Due to the good photocatalytic performance, which ensures the decomposition of pollutants under light, g-C₃N₄ is considered as an ideal photocatalytic material. Montmorillonite has a high adsorption capacity and layered structure, which has positive effects on increasing the specific surface area of g-C₃N₄ and avoid its polymerization agglomeration. In this paper, montmorillonite was used as carrier for g-C₃N₄ to obtain a new photocatalytic composite g-C₃N₄/Mt. Then the morphological and (micro)structural properties were characterized. The well-characterized materials were evaluated for the photocatalytic activity in degradation of methylene blue and Bisphenol A. The effects of the mass fraction of g-C₃N₄, light irradiation time, and pollutant concentration on the photocatalytic performance of g-C₃N₄/Mt composites were studied. Under the optimal experimental plan, the rate of photocatalytic degradation can reach to 99.3% within 120 min. Through the MS spectrum, it can be found that methylene blue molecule were catalysed and degraded into many harmless substances with low-molecular weight. Finally, based on the obtained reaction products, the mechanism by which the pollutants are removed was proposed. This study provides a new strategy to improve the photocatalysis ability of g-C₃N₄, which is of great significance for a sustainable pollution treatment.

摘要

由于良好的光催化性能，保证了污染物在光照下的分解，g - C ₃ N ₄被认为是一种理想的光催化材料。_{蒙脱石具有较高的吸附能力和层状结构，对增加gC 3} N ₄的比表面积和避免其聚合团聚有积极作用。本文以蒙脱土为载体gC ₃ N ₄获得新型光催化复合材料gC ₃ N ₄/公吨。然后表征形态和（微观）结构特性。对表征良好的材料进行光催化降解亚甲蓝和双酚A的评价。 gC ₃ N ₄的质量分数、光照时间和污染物浓度对gC ₃ N _{4光催化性能的影响}/Mt 复合材料进行了研究。在最优实验方案下，120 min内光催化降解率可达99.3%。通过质谱图可以发现，亚甲蓝分子被催化降解为许多无害的低分子量物质。最后，基于得到的反应产物，提出了污染物去除的机理。该研究为提高gC ₃ N ₄的光催化能力提供了一种新的策略，对于可持续的污染治理具有重要意义。