Graphene Oxide Functionalized with Cationic Porphyrins as Materials for the Photodegradation of Rhodamine B,The Journal of Physical Chemistry C

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Graphene Oxide Functionalized with Cationic Porphyrins as Materials for the Photodegradation of Rhodamine B
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-06-19 , DOI: 10.1021/acs.jpcc.0c03907
Daria Larowska ₁ , Jessica M O'Brien ₂ , Mathias O Senge ₂ , Gotard Burdzinski ₃ , Bronisław Marciniak _{1,

4} , Anna Lewandowska-Andralojc _{1,

4}

Affiliation

Two noncovalent nanohybrids between cationic porphyrin (free-base TMPyP and zinc(II) ZnTMPyP) bearing cationic (N-methylpyridyl) groups and graphene oxide (GO) were constructed with the aim of generating a photocatalyst active for rhodamine B (RhB) degradation. The obtained materials were thoroughly characterized by steady-state and time-resolved absorption and emission methods, which indicated that metalation of the porphyrin with Zn(II) increases the affinity of the porphyrin toward the GO surface. Photocurrent experiment together with femtosecond transient absorption spectroscopy clearly showed the existence of electron transfer from the photoexcited porphyrin to GO. Both hybrid materials demonstrated higher photocatalytic activity toward RhB degradation as compared to GO; however, ZnTMPyP–GO exhibited more efficient performance (19% of RhB decomposition after 2 h of irradiation). Our data indicate that the presence of Zn(II) in the core of the porphyrin can promote charge separation in the ZnTMPyP–GO composites. The higher degradation rate seen with ZnTMPyP–GO as compared to the TMPyP–GO assemblies highlights the beneficial role of Zn(II)-metalation of the porphyrin ring.

中文翻译：

阳离子卟啉功能化氧化石墨烯作为光降解罗丹明 B 的材料

构建了带有阳离子（ N-甲基吡啶基）基团的阳离子卟啉（游离碱 TMPyP 和锌（II）ZnTMPyP）与氧化石墨烯（GO）之间的两种非共价纳米杂化物，旨在产生用于罗丹明 B（RhB）降解的光催化剂活性。通过稳态和时间分辨吸收和发射方法对所获得的材料进行了彻底的表征，这表明卟啉与 Zn(II) 的金属化增加了卟啉对 GO 表面的亲和力。光电流实验和飞秒瞬态吸收光谱清楚地表明存在从光激发的卟啉到GO的电子转移。与 GO 相比，两种杂化材料对 RhB 降解均表现出更高的光催化活性；然而，ZnTMPyP-GO 表现出更有效的性能（照射 2 小时后，RhB 分解了 19%）。我们的数据表明，卟啉核心中 Zn(II) 的存在可以促进 ZnTMPyP-GO 复合材料中的电荷分离。与 TMPyP-GO 组件相比，ZnTMPyP-GO 具有更高的降解率，凸显了卟啉环 Zn(II) 金属化的有益作用。

更新日期：2020-07-23

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