Adsorption of uranium from aqueous solution as well as seawater conditions by nitrogen-enriched nanoporous polytriazine

Chaudhary, Meenu; Singh, Lakhwinder; Rekha, Pawan; Srivastava, Vimal Chandra

doi:10.1016/j.cej.2019.122236

Cited by 90 publications

(55 citation statements)

References 75 publications

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“…This effect is prominent in sample heated at 350 °C and above this, even some bands mergerd to form much broader bands indicating the carbonization. FTIR investigation showing the broad bands on heating at 400 °C and above further indicates the carbonization of the NENP‐1 as already previously reported (Figure ) …”

Section: Resultssupporting

confidence: 84%

“…The FTIR spectrum of NENP‐1 confirmed the successful condensation due to the observation of a single broad absorption band centered at ∼3400 cm −1 attributed to the secondary amine N−H stretching vibration and absence of a band at ∼850 cm −1 , which is attributed to the C−Cl stretching vibration . In order to get the understanding of any structural changes occurred during the heat treatment at different temperatures, the FTIR investigation of all the heat treated specimens have been carried out.…”

Section: Resultsmentioning

confidence: 85%

“…Nitrogen enriched nanoporous polytriazines (NENPs), where the nitrogen content can vary from 20 to 54 wt%, are investigated for various applications in catalysis, energy and environmental fields . Gas storage, especially the CO 2 capture application of these NENPs has drawn a lot of interest recently .…”

Section: Introductionmentioning

confidence: 99%

“…Gas storage, especially the CO 2 capture application of these NENPs has drawn a lot of interest recently . The NENPs are popular due to the use of inexpensive precursors, ease of synthesis and thermal stability . Our research group has recently reported the synthesis of NENP‐1 that was made in a short reaction time of 30 min using melamine and cyanuric chloride as precursors in a microwave reactor with power of 400 W .…”

Section: Introductionmentioning

confidence: 99%

“…The NENPs are popular due to the use of inexpensive precursors, ease of synthesis and thermal stability . Our research group has recently reported the synthesis of NENP‐1 that was made in a short reaction time of 30 min using melamine and cyanuric chloride as precursors in a microwave reactor with power of 400 W . The high specific surface area (SA BET ) of 840 m 2 g −1 in the polymer NENP‐1 with a narrow pore size distribution (PSD) of ∼1.3 nm and high nitrogen content of 50 wt%, captures 22.9 wt% of CO 2 at 0 °C and 1 bar (Table S1).…”

Section: Introductionmentioning

confidence: 99%

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Pre‐Carbonization: An Efficient Route to Improve the Textural and Gas Sorption Properties of Nitrogen‐Enriched Nanoporous Polytriazine

Chaudhary

Mohanty

2019

ChemNanoMat

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An unprecedented approach to improve the CO 2 capture capacity by heating nitrogen enriched nanoporous polytriazine (NENP-1) below the carbonization (pre-carbonization) temperature has been invented. The NENP-1 heated at 350°C for 2 h (assigned as NENP-1-350) in argon atmosphere has improved specific surface area (SA BET ) marginally from 840 (NENP-1) to 880 m 2 g À 1 (NENP-1-350). However, there was a substantial increase in the CO 2 capture capacity from 22.9 (NENP-1) to 33.8 wt% (NENP-1-350) measured at 0°C and 1 bar. Although, both the specimens have compara-ble SA BET , the NENP-1-350 has larger pore volume of 1.10 cm 3 g À 1 (as compared to 0.71 cm 3 g À 1 in NENP-1) and larger pore size distribution (PSD) along with the higher isosteric heat of adsorption that contributed for such a high CO 2 capture capacity. Unlike the CO 2 capture capacity in the NENP-1-350, there was only marginal increase in the hydrogen storage capacity from 2.30 to 2.47 wt% and methane sorption capacity from 1.8 to 1.9 wt% measured at À 196 and 0°C, respectively, as compared to the NENP-1.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pre‐Carbonization: An Efficient Route to Improve the Textural and Gas Sorption Properties of Nitrogen‐Enriched Nanoporous Polytriazine

Chaudhary

Mohanty

2019

ChemNanoMat

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Preparation, characterization, and application of stable naphthalenediimide‐based metal–organic framework for cooperative capture low concentration uranium from wastewater

Zhao,

Li,

Liao

et al. 2023

Env Prog and Sustain Energy

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Extracting uranium from real water samples remains a great challenge due to low uranium concentration, concentrated competing ions and volumes of water. The design and preparation of uranium adsorbents with high efficiency and affinity are still difficult. Herein, we presented a facile one‐pot strategy to obtain a novel metal organic framework (denoted as Mn‐NDISA) for stable and efficient trapping of low concentration uranium. Mn‐NDISA with a built‐in hydrophobic cavity can boost the absorption affinity to 1.99 × 106 mL g−1 through the cooperative capture composed of electrostatic interaction, coordination force and hydrogen binding. Owing to the coordination‐available oxygen sites in flexible framework, a rapid kinetic equilibrium was achieved in just 25 min. Moreover, these exceptional adsorption features enabled Mn‐NDISA to successfully capture the naturally occurring uranium traces (~ppb) in wastewater samples, making it one of the most influential absorbents toward UO22+ ever reported. The experimental and theoretical studies revealed that the electrostatic attraction came from the surface negatively charged Mn‐NDISA and the positively charged UO22+. The coordination originated from Lewis basic hydroxyl, carbonyl groups, and Lewis acid UO22+, while hydrogen bonds further reinforced the as‐formed uranium binding complex. This research offered a promising cooperative capture strategy to improve the uranium affinity of the pristine MOF for trace contaminants removal in environmental remediation fields.

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Nano-scale zerovalent copper: green synthesis, characterization and efficient removal of uranium

Chandra

Khan

2020

J Radioanal Nucl Chem

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Adsorption of uranium from aqueous solution as well as seawater conditions by nitrogen-enriched nanoporous polytriazine

Cited by 90 publications

References 75 publications

Pre‐Carbonization: An Efficient Route to Improve the Textural and Gas Sorption Properties of Nitrogen‐Enriched Nanoporous Polytriazine

Pre‐Carbonization: An Efficient Route to Improve the Textural and Gas Sorption Properties of Nitrogen‐Enriched Nanoporous Polytriazine

Preparation, characterization, and application of stable naphthalenediimide‐based metal–organic framework for cooperative capture low concentration uranium from wastewater

Nano-scale zerovalent copper: green synthesis, characterization and efficient removal of uranium

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