Rational Construction of a Responsive Azo-Functionalized Porous Organic Framework for CO2 Sorption

Yuan, Rongrong; Sun, Hao

doi:10.3390/molecules26164993

Cited by 2 publications

(3 citation statements)

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“…Various physical adsorbents such as carbonaceous material [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ], zeolite [ 22 ], ordered mesoporous silica [ 23 ], metal-organic frameworks (MOFs) [ 24 , 25 , 26 ], porous polymers [ 27 , 28 , 29 ] and membrane-based systems [ 30 ] have been investigated to capture CO 2 . Among these, porous carbons have been receiving significant attention for their wide-scale availability, ease of regeneration, low cost, high chemical/thermal stability, large surface area and capability of being tuned for applications not only for adsorbents but also for supercapacitors, battery electrodes and catalyst supports [ 31 , 32 , 33 , 34 , 35 , 36 ].…”

Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of N-Rich Porous Carbon for Efficient CO2 Adsorption Performance

Bai

Huang

et al. 2022

Molecules

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N-enriched porous carbons have played an important part in CO2 adsorption application thanks to their abundant porosity, high stability and tailorable surface properties while still suffering from a non-efficient and high-cost synthesis method. Herein, a series of N-doped porous carbons were prepared by a facile one-pot KOH activating strategy from commercial urea formaldehyde resin (UF). The textural properties and nitrogen content of the N-doped carbons were carefully controlled by the activating temperature and KOH/UF mass ratios. As-prepared N-doped carbons show 3D block-shaped morphology, the BET surface area of up to 980 m2/g together with a pore volume of 0.52 cm3/g and N content of 23.51 wt%. The optimal adsorbent (UFK-600-0.2) presents a high CO2 uptake capacity of 4.03 mmol/g at 0 °C and 1 bar. Moreover, as-prepared N-doped carbon adsorbents show moderate isosteric heat of adsorption (43–53 kJ/mol), acceptable ideal adsorption solution theory (IAST) selectivity of 35 and outstanding recycling performance. It has been pointed out that while the CO2 uptake was mostly dependent on the textural feature, the N content of carbon also plays a critical role to define the CO2 adsorption performance. The present study delivers favorable N-doped carbon for CO2 uptake and provides a promising strategy for the design and synthesis of the carbon adsorbents.

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Section: Introductionmentioning

confidence: 99%

One-Pot Synthesis of N-Rich Porous Carbon for Efficient CO2 Adsorption Performance

Bai

Huang

et al. 2022

Molecules

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“…The calculated CO 2 Q st value of the initial sample is as high as 29.0 kJ mol −1 , but after 5 h of UV irradiation, the value decreases to 26.5 kJ mol −1 , proving the trans/cis structure transformation of JJU-2 ( Figure 4 e). Table 3 provides samples of representative materials [ 48 , 49 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 ].…”

Section: Resultsmentioning

confidence: 99%

“…Based on our previous reports [ 48 , 49 ], we design and develop a carbazole-based azo-functionalized POP (JJU-2) by coupling 1,3,5-tris(9H-carbazole-9-yl) benzene (TCB) and azobenzene (AB) ( Scheme 1 ). High stability, a large surface area, and well-developed pores characterize the prepared sample.…”

Section: Introductionmentioning

confidence: 99%

Design and Construction of an Azo-Functionalized POP for Reversibly Stimuli-Responsive CO2 Adsorption

2023

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A porous azo-functionalized organic polymer (JJU-2) was designed and prepared via oxidative coupling polymerization promoted by FeCl3. JJU-2 exhibited reversibly stimuli-responsive CO2 adsorption properties as a result of the trans/cis isomerization of the polymer’s azo-functionalized skeleton. Under UV irradiation and heat treatment, this porous material displayed various porous structures and CO2 adsorption properties. The initial Brunauer-Emmett-Teller (BET) surface area of JJU-1 is 888 m2 g−1. After UV irradiation, the BET surface area decreases to 864 m2 g−1, along with the decrease of micropores around 0.50 nm and 1.27 nm during the trans-to-cis isomerization process. In addition, CO2 sorption isotherms demonstrate an 8%t decrease, and the calculated Qst of CO2 has decreased from 29.0 kJ mol−1 to 26.5 kJ mol−1 due to the trans to cis conversion of the azobenzene side group. It is noteworthy that JJU-2′s CO2 uptakes are nearly constant over three cycles of alternating external stimuli. Therefore, this azo-functionalized porous material was a potential carbon capture material that was responsive to stimuli.

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Rational Construction of a Responsive Azo-Functionalized Porous Organic Framework for CO2 Sorption

Cited by 2 publications

References 56 publications

One-Pot Synthesis of N-Rich Porous Carbon for Efficient CO2 Adsorption Performance

One-Pot Synthesis of N-Rich Porous Carbon for Efficient CO2 Adsorption Performance

Design and Construction of an Azo-Functionalized POP for Reversibly Stimuli-Responsive CO2 Adsorption

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