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首页> 外文期刊>RSC Advances >Fabrication of interlayer β-CD/g-C3N4@MoS2 for highly enhanced photodegradation of glyphosate under simulated sunlight irradiation
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Fabrication of interlayer β-CD/g-C3N4@MoS2 for highly enhanced photodegradation of glyphosate under simulated sunlight irradiation

机译：模拟太阳光照射下草甘膦光降解性能增强的中间层β-CD/ g-C3N4 @ MoS2的制备

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Graphitic carbon nitride (g-C _(3) N _(4) ) has been considered to be a promising metal-free photocatalyst, although the high recombination rate of charge carriers and poor absorption of visible light have limited its applications. In order to overcome these problems, an interlayer composite photocatalyst that comprised β-cyclodextrin (β-CD), oxygen-doped C _(3) N _(4) (O-C _(3) N _(4) ) and molybdenum disulfide (MoS _(2) ) was successfully constructed for the highly enhanced photodegradation of glyphosate in this study. The structure and morphology, optical properties, and photoelectrochemical properties of the prepared photocatalyst were characterized via a series of characterization techniques. The average fluorescence lifetime of the composite photocatalyst was extended from 6.67 ns to 7.30 ns in comparison with that of g-C _(3) N _(4) , which indicated that the composite photocatalyst enhanced the absorption of visible light and also inhibited the recombination of electron–hole pairs. The mass ratio of MoS _(2) that corresponded to O-C _(3) N _(4) /MoS _(2) -5 enabled the highest removal rate under simulated sunlight irradiation, which was almost twice that achieved using pure g-C _(3) N _(4) . Relative species scavenging experiments revealed that ·O _(2) ~(?) was the main species during the process of photodegradation. Besides, a toxicity test indicated that glyphosate became less toxic or non-toxic after photodegradation. This study provided an effective, feasible and stable photocatalyst driven by simulated sunlight irradiation for the highly enhanced photodegradation of glyphosate.
机译：尽管电荷载流子的高复合率和可见光吸收差，限制了其应用，但石墨碳氮化物（g-C _（3）N _（4））被认为是一种有前途的无金属光催化剂。为了克服这些问题，提出了一种包含β-环糊精（β-CD），氧掺杂的C _（3）N _（4）（OC _（3）N _（4））和二硫化钼的层间复合光催化剂。 （MoS _（2））已成功构建，用于本研究中草甘膦的高度光降解。通过一系列表征技术表征了制备的光催化剂的结构和形貌，光学性质和光电化学性质。与gC _（3）N _（4）相比，复合光催化剂的平均荧光寿命从6.67 ns延长至7.30 ns，这表明复合光催化剂增强了可见光的吸收，并抑制了复合光催化剂的重组。电子-空穴对。相当于OC _（3）N _（4）/ MoS _（2）-5的MoS _（2）的质量比使得模拟阳光照射下的去除率最高，几乎是使用纯gC _所达到的两倍。 （3）N _（4）。相对物种清除实验表明，·O _（2）〜（？）是光降解过程中的主要物种。此外，毒性试验表明草甘膦在光降解后毒性降低或变为无毒。该研究提供了一种有效，可行且稳定的模拟阳光照射驱动的光催化剂，可大大提高草甘膦的光降解能力。

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