Vibrational frequencies and structural determination of tellurophene

Jensen, James O.

doi:10.1016/j.theochem.2004.11.036

Cited by 5 publications

(1 citation statement)

References 34 publications

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“…In our study, we observed that these bands were present in samples with the highest adsorption capacities (MP500 and MPS500), suggesting that the presence of these hydroxyl groups may have contributed to the observed increase in adsorption capacity ( Table 1 ). The absorption bands at the regions 1025-870 and 800–650 cm −1 present both in MP500 and MPS500 are, respectively, associated to the stretching of the P–O–P [ 34 , 35 ] and P–C bonds [ 17 , 36 ]. The peaks at the region 1120–1020 cm −1 , appearing only in the MP500 sample, correspond to stretching of the C-O-P bond that is observed when esterification reactions occur between cellulose and hemicellulose chains of the carbon matrix with phosphate groups [ 26 , 28 , 30 , 37 ].…”

Section: Resultsmentioning

confidence: 99%

Adsorption of Phenylalanine from Aqueous Solutions Using Activated Carbon from Sunflower Meal Functionalized with Sulfonic Groups

Lima

Oliveira

Franca

2022

Foods

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The present work proposes the use of an agro-industrial residue from the sunflower crop as a feedstock to produce a low-cost adsorbent with a chemically modified surface bearing sulfonic groups. This modified low-cost adsorbent can be used for the removal of phenylalanine, and can also be applied in the process of obtaining a source of protein supplementation for patients with phenylketonuria. The functionalization of the adsorbent with sulfonic groups was adapted and presented advantages in terms of execution time, energy expenditure, number of reagents used and adsorbed amino acids. The produced adsorbent presented a surface area of 317.31 m2 g−1 with a predominance of micro- and mesopores, that influenced an approximate 30-fold reduction in adsorption equilibrium time. The optimization results indicated a higher adsorption capacity (39.64 mg.g−1) in pH = 4; temperature of 25 °C and adsorbent dosage of 10 g.L−1. The FTIR analyzes and the qualitative analysis of the elements present in the samples by EDS confirmed the introduction of sulfonic groups in the MPS500 coal. This work contributed to the understanding behind the adsorption of L-phenylalanine on charcoal surfaces functionalized with sulfonic groups, showing that they can be more selective for the adsorption of phenylalanine in a competitive system.

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Section: Resultsmentioning

confidence: 99%

Adsorption of Phenylalanine from Aqueous Solutions Using Activated Carbon from Sunflower Meal Functionalized with Sulfonic Groups

Lima

Oliveira

Franca

2022

Foods

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Theoretical and Computational Aspects of Organotellurium Compounds

Longo

Menezes

2011

Patai's Chemistry of Functional Groups

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Computational methods applied to organotellurium compounds are reviewed and some new systematic studies are provided for completeness. From the reviewed works, only those which have connections and/or insights into experimental data and observations are thoroughly considered. It is hoped that no expertise on computational quantum chemical methods will be needed, but a brief survey of computational methods and a list of acronyms are provided. Despite being applied to organotellurium compounds only in recent years, quantum chemical methods provide relevant information for comprehending, rationalizing and guiding experimental results and observations. However, there are further studies to be performed to ascertain the predictive features of these methods.

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Tellurophenes

Минкин

Sadekov

2008

Comprehensive Heterocyclic Chemistry III

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Vibrational frequencies and structural determination of tellurophene

Cited by 5 publications

References 34 publications

Adsorption of Phenylalanine from Aqueous Solutions Using Activated Carbon from Sunflower Meal Functionalized with Sulfonic Groups

Adsorption of Phenylalanine from Aqueous Solutions Using Activated Carbon from Sunflower Meal Functionalized with Sulfonic Groups

Theoretical and Computational Aspects of Organotellurium Compounds

Tellurophenes

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