Exciton dissociation and transfer behavior and surface reaction mechanism in Donor–Acceptor organic semiconductor photocatalytic separation of uranium

IF 20.2 1区化学 Q1 CHEMISTRY, PHYSICAL

Applied Catalysis B: Environmental Pub Date : 2023-09-05 DOI:10.1016/j.apcatb.2023.122751

Zifan Li , Zhibin Zhang , Xiang Zhu , Cheng Meng , Zhimin Dong , Songtao Xiao , Yingcai Wang , Youqun Wang , Xiaohong Cao , Yunhai Liu

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引用次数: 8

Abstract

Photocatalytic uranium extraction from nuclear effluent is a promising approach for avoiding environmental damage and recovering uranium resources. Here, a hollow tube-like D-A organic semiconductor photocatalyst consisting of triazine (Acceptor) and carbon ring (Donnor) was synthesized via two cheap monomers, sodium alginate and melamine. The incorporation of carbon ring structure could endow g-C₃N₄ with unique hollow hexagonal tube-like morphology, modulate the electronic excitation model, lower the energy for exciton dissociation, and promote the adsorption and activation of O₂. Thus, the D-A photocatalyst established high efficiency of photocatalytic uranium separation under LED light and high concentration of anions and cations interference. More importantly, we propose a novel theory, that photocatalytic-induced-uranyl-coordination-reaction (PIUCR), and highlight that the formation rate and pathway of crystal nucleus is the most crucial step for the surface reaction of photocatalytic uranium separation. This study provides insights and guidelines for the in-depth understanding of the photocatalytic separation of uranium.

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给受体有机半导体光催化分离铀的激子解离转移行为及表面反应机理

光催化从核废水中提取铀是避免环境破坏和回收铀资源的一种很有前途的方法。本文以海藻酸钠和三聚氰胺为原料，合成了一种由三嗪(受体)和碳环(受体)组成的空心管状D-A有机半导体光催化剂。碳环结构的加入可以使g-C3N4具有独特的空心六方管状形态，调节电子激发模型，降低激子解离能，促进O2的吸附和活化。因此，D-A光催化剂在LED光下建立了高效的光催化铀分离效率和高浓度的阴离子和阳离子干扰。更重要的是，我们提出了一个新的理论，即光催化诱导铀酰配位反应(PIUCR)，并强调晶核的形成速度和途径是光催化铀分离表面反应的最关键步骤。本研究为深入了解铀的光催化分离提供了新的思路和指导。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Catalysis B: Environmental 环境科学-工程：化工

CiteScore

38.60

自引率

6.30%

发文量

1117

审稿时长

24 days

期刊介绍： Applied Catalysis B: Environment and Energy (formerly Applied Catalysis B: Environmental) is a journal that focuses on the transition towards cleaner and more sustainable energy sources. The journal's publications cover a wide range of topics, including: 1.Catalytic elimination of environmental pollutants such as nitrogen oxides, carbon monoxide, sulfur compounds, chlorinated and other organic compounds, and soot emitted from stationary or mobile sources. 2.Basic understanding of catalysts used in environmental pollution abatement, particularly in industrial processes. 3.All aspects of preparation, characterization, activation, deactivation, and regeneration of novel and commercially applicable environmental catalysts. 4.New catalytic routes and processes for the production of clean energy, such as hydrogen generation via catalytic fuel processing, and new catalysts and electrocatalysts for fuel cells. 5.Catalytic reactions that convert wastes into useful products. 6.Clean manufacturing techniques that replace toxic chemicals with environmentally friendly catalysts. 7.Scientific aspects of photocatalytic processes and a basic understanding of photocatalysts as applied to environmental problems. 8.New catalytic combustion technologies and catalysts. 9.New catalytic non-enzymatic transformations of biomass components. The journal is abstracted and indexed in API Abstracts, Research Alert, Chemical Abstracts, Web of Science, Theoretical Chemical Engineering Abstracts, Engineering, Technology & Applied Sciences, and others.