Heptazine based organic framework as a chemiresistive sensor for ammonia detection at room temperature

Sharma, Nidhi; Sharma, Neha; Srinivasan, P. Bala; Kumar, Sunil; Rayappan, John Bosco Balaguru; Kailasam, Kamalakannan

doi:10.1039/c8ta06937a

Cited by 65 publications

(49 citation statements)

References 46 publications

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“…Nevertheless, with their excellent structural property, heptazinebased compounds/frameworks are still in their infancy to be explored due to unavailability of reactive and soluble heptazine precursors (Van Humbeck et al, 2014;Das et al, 2017). In 2002, Kroke et al summarized the structural property of the soluble and reactive heptazine precursor, that is, 2, 5, 8-trichloros-heptazine or cyameluric chloride, which embarked the development of heptazine-based precursors and polymeric frameworks for different applications (Kroke et al, 2002;Kailasam et al, 2013;Kailasam et al, 2016;Bala et al, 2017;Bala et al, 2018;Sharma et al, 2018;Sharma et al, 2021). In recent years metal-free POPs and covalent organic frameworks have been considered as a potential candidate for CO 2 sorption and conversion (Zeng et al, 2016;Oschatz and Antonietti, 2018).…”

Section: Introductionmentioning

confidence: 99%

Metal-Free Heptazine-Based Porous Polymeric Network as Highly Efficient Catalyst for CO2 Capture and Conversion

Sharma¹,

Ugale²,

Kumar³

et al. 2021

Front. Chem.

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The capture and catalytic conversion of CO2 into value-added chemicals is a promising and sustainable approach to tackle the global warming and energy crisis. The nitrogen-rich porous organic polymers are excellent materials for CO2 capture and separation. Herein, we present a nitrogen-rich heptazine-based microporous polymer for the cycloaddition reaction of CO2 with epoxides in the absence of metals and solvents. HMP-TAPA, being rich in the nitrogen site, showed a high CO2 uptake of 106.7 mg/g with an IAST selectivity of 30.79 toward CO2 over N2. Furthermore, HMP-TAPA showed high chemical and water stability without loss of any structural integrity. Besides CO2 sorption, the catalytic activity of HMP-TAPA was checked for the cycloaddition of CO2 and terminal epoxides, resulting in cyclic carbonate with high conversion (98%). They showed remarkable recyclability up to 5 cycles without loss of activity. Overall, this study represents a rare demonstration of the rational design of POPs (HMP-TAPA) for multiple applications.

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Section: Introductionmentioning

confidence: 99%

Metal-Free Heptazine-Based Porous Polymeric Network as Highly Efficient Catalyst for CO2 Capture and Conversion

Sharma¹,

Ugale²,

Kumar³

et al. 2021

Front. Chem.

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“…The specific surface area and pore size distribution of the polymers have been studied using N 2 adsorption isotherms at 77 K (Figure S5, Supporting Information). [37] Obviously, the nitrogen adsorption curves show a steady increase above the relative pressure P/P 0 > 0.2, indicating that the pore size distribution of the sample has mesopores and a small amount of macropores, which can be further proved by the pore size distribution diagram. Table S1, Supporting Information, gives detailed information about the BET specific surface area, pore size, and pore volume of the sample.…”

Section: Syntheses and Structural Characterizationsmentioning

confidence: 78%

Donor‐Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations towards Tetracyclines

Zeng

et al. 2021

Macromol. Rapid Commun.

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Photocatalysis is an efficient and green technology in the environmental protection. Due to the high charge separation and transfer, donor-acceptor (D-A) conjugated polymers attract much attention for their photocatalytic degradations towards organic pollutants. Herein, the authors reported three novel D-A conjugated polymers, named as HPBP, HPTP, and HPF, with heptazine moieties as electron acceptors, while biphenyl, terphenyl, or fluorene moieties as electron donors, respectively, which indeed exhibit a highly efficient photocatalytic degradation towards tetracyclines upon the visible-light irradiation. Among them, the photocatalytic performance of HPF is especially noticeable with the degradation rate up to 87% within 30 min, almost 11 times in comparison to those of pristine g-C 3 N 4 , which is mainly attributed to its high crystallinity and conjugation. For their photocatalytic mechanism, the •O 2 radical anions are regarded as the active species.

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“…S2 in the SD). Compared to toluene, acetaldehyde was removed to a greater extent by both adsorption and photocatalytic degradation, due to the lower molecular weight [63].…”

Section: Photocatalytic Removal Of Organics By Mil-53(fe)mentioning

confidence: 99%

Visible-light photocatalysis over MIL-53(Fe) for VOC removal and viral inactivation in air

Park

Seo

Kim

et al. 2021

Environmental Engineering Research

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, synthesized by a one-step hydrothermal method, was investigated for the removal of toluene and inactivation of bacteriophage X 174 in air under visible light illumination. MIL-53(Fe) exhibited superior photochemical activity to other metal organic frameworks synthesized by the same method with different metal precursors. Analytical methods of diffuse reflectance spectroscopy, BET specific surface area analysis, SEM-EDS, FT-IR analysis, XRD, Mott-Schottky analysis, and XPS were used to characterize MIL-53(Fe). The illuminated MIL-53(Fe) removed input toluene (C 0 = 3.59 g/m 3 ) by 66% in 6 h by adsorption and subsequent photocatalytic oxidation. High humidity and temperature, and the anoxic condition inhibited the toluene removal. MIL-53(Fe) showed sustainable toluene removal for five consecutive runs, even though the photocatalytic activity slightly decreased. Meanwhile, the illuminated MIL-53(Fe) also resulted in the inactivation of X 174 suspended in air, achieving approximately 3 log inactivation in 60 min (N 0 = ~10 6 PFU/mL air). Similar to toluene removal, the presence of oxygen and low humidity were beneficial for viral inactivation. The photo-generated holes are believed to be responsible for the organic degradation and viral inactivation by the illuminated MIL-53(Fe).

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Heptazine based organic framework as a chemiresistive sensor for ammonia detection at room temperature

Abstract: We have demonstrated for the first time, a heptazine based microporous polymer sensor for the detection of ammonia at room temperature and under ambient conditions. .

Cited by 65 publications

References 46 publications

Metal-Free Heptazine-Based Porous Polymeric Network as Highly Efficient Catalyst for CO2 Capture and Conversion

Metal-Free Heptazine-Based Porous Polymeric Network as Highly Efficient Catalyst for CO2 Capture and Conversion

Donor‐Acceptor Conjugated Heptazine Polymers with Highly Efficient Photocatalytic Degradations towards Tetracyclines

Visible-light photocatalysis over MIL-53(Fe) for VOC removal and viral inactivation in air

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