Encapsulating site-directly carbonized CDs in MOF(Cr) as adsorption-photothermal sites for boosting toluene Ad/de-sorption process via photo-assisted strategy

IF 13.3 1区工程技术 Q1 ENGINEERING, CHEMICAL

Chemical Engineering Journal Pub Date : 2025-02-03 DOI:10.1016/j.cej.2025.160104

Jingyu Bao, Xinqi Luan, Ruimeng Wang, Xiaonuo Li, Zhaowei Jia, Liqin Zhou, Jianmin Chen, Jiguang Deng, Zhongxing Zhao, Zhenxia Zhao

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引用次数: 0

Abstract

Metal-organic frameworks (MOFs) require high energy for the desorption of volatile organic compounds (VOCs) due to their strong adsorption affinity. For this purpose, a photo-assisted desorption is proposed for MOF regeneration. Herein, carbon dots (CDs) with efficient light absorption and thermal conductivity are encapsulated in MOFs using the “site-directly carbonization” approach, forming ship-in-a-bottle o-CDs-M101. These CDs can act as “VOCs affinity sites” and “photothermal spots” in MOFs, simultaneously maintaining toluene adsorption capacity, while enhancing desorption efficiency under humid conditions. Consequently, the designed o-CDs-M101 (2558 m²/g) achieves a 40 % increase in toluene uptake compared to the original MIL-101(Cr), reaching up to 3.6 mmol/g under 400 ppm and RH = 60 %. During the desorption process, CDs rapidly generate heat/electrons under light radiation to attack the adsorbed VOCs and make them quickly and thoroughly desorb. Owing to this attribute, it shows 3.4 and 3.8 times faster desorption rate and higher concentration ratio under photo-assisted conditions at 110 °C compared to thermal conditions. Interestingly, these adsorbed H₂O further dramatically accelerate toluene desorption from MOFs, up to 2.5 times faster compared to water-free conditions. This approach is also broadly applicable to HKUST-1 and MIL-100(Fe), achieving similar high efficiency in toluene photo-assisted desorption. The findings demonstrate that the introduction of photothermal sites offers a promising approach to MOF regeneration with high efficiency and low energy consumption.

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来源期刊

Chemical Engineering Journal 工程技术-工程：化工

CiteScore

21.70

自引率

9.30%

发文量

6781

审稿时长

2.4 months

期刊介绍： The Chemical Engineering Journal is an international research journal that invites contributions of original and novel fundamental research. It aims to provide an international platform for presenting original fundamental research, interpretative reviews, and discussions on new developments in chemical engineering. The journal welcomes papers that describe novel theory and its practical application, as well as those that demonstrate the transfer of techniques from other disciplines. It also welcomes reports on carefully conducted experimental work that is soundly interpreted. The main focus of the journal is on original and rigorous research results that have broad significance. The Catalysis section within the Chemical Engineering Journal focuses specifically on Experimental and Theoretical studies in the fields of heterogeneous catalysis, molecular catalysis, and biocatalysis. These studies have industrial impact on various sectors such as chemicals, energy, materials, foods, healthcare, and environmental protection.