Adsorption and desorption mechanisms on graphene oxide nanosheets: Kinetics and tuning

A knowledge of the adsorption and desorption behavior of sorbates on surface adsorptive site (SAS) is the key to optimizing the chemical reactivity of catalysts. However, direct identification of the chemical reactivity of SASs is still a challenge due to the limitations of characterization techniqu...

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Published in:Innovation (New York, NY) NY), 2021-08, Vol.2 (3), p.100137-100137, Article 100137
Main Authors: Qu, Xiaodan, Hu, Qiong, Song, Zhongqian, Sun, Zhonghui, Zhang, Baohua, Zhong, Jialing, Cao, Xuyou, Liu, Yuanjin, Zhao, Bolin, Liu, Zhenbang, Shen, Yujie, Bao, Yu, Wang, Zhenxin, Zhang, Yuwei, Niu, Li
Format: Article
Language:English
Subjects:
adsorption
carbon dots
desorption
fluorescence microscopy
graphene oxide
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Summary:A knowledge of the adsorption and desorption behavior of sorbates on surface adsorptive site (SAS) is the key to optimizing the chemical reactivity of catalysts. However, direct identification of the chemical reactivity of SASs is still a challenge due to the limitations of characterization techniques. Here, we present a new pathway to determine the kinetics of adsorption/desorption on SASs of graphene oxide (GO) based on total internal reflectance fluorescence microscopy. The switching on and off of the fluorescent signal of SAS lit by carbon dots (CDs) was used to trace the adsorption process and desorption process. We find that sodium pyrophosphate (PPi) could increase the adsorption equilibrium of CDs thermodynamically and promote the substrate-assisted desorption pathway kinetically. At the single turnover level, it was disclosed that the species that can promote desorption may also be an adsorption promoter. Such discovery provides significant guidance for improving the chemical reactivity of the heterogeneous catalyst. [Display omitted] •The kinetics of adsorption and desorption process were revealed, respectively, by monitoring a fluorogenic process of carbon dots on the surface of graphene oxides at the single turnover level•By regulating the equilibrium of adsorption and desorption, a mechanism for the simultaneous promotion of adsorption and desorption has been discovered•A desorption accelerator could play a satisfactory double action, i.e., adsorption promoter on thermodynamics and desorption promoter on kinetics
ISSN:2666-6758
2666-6758
DOI:10.1016/j.xinn.2021.100137