Catalytic reduction of NO over copper supported on activated carbon

Ramalho, P. S. F.; Soares, O.S.G.P.; Figueiredo, Joana; Pereira, M.F.R.

doi:10.1016/j.cattod.2023.114044

Cited by 4 publications

(6 citation statements)

References 46 publications

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“…Since GAC was selected as the carbon material to be employed in further experiments, modifications to GAC surface chemistry were performed with the aim of improving catalytic properties. Melamine (GAC-M) and urea (GAC-U) were the nitrogen precursors adopted for this purpose and nitric acid (GAC-HNO 3 ) for oxygen-containing groups since there is evidence in the literature that these are capable of introducing new active sites and improving the electron-transfer properties of carbon materials. ,, …”

Section: Resultsmentioning

confidence: 99%

“…This means that GAC-HNO 3 is likely to have more active sites for interactions with PS and AMT, which justifies the greater oxidative efficiency. The surface chemistry of this material can also be a key feature behind these results, since GAC-HNO 3 is expected to present a higher content in oxygen-containing surface groups than raw GAC and GAC modified with N-precursors, , which are known to be active sites for sulfate radicals generation. − …”

Section: Resultsmentioning

confidence: 99%

“…The carbon material treated with HNO 3 was prepared according to the procedure detailed in Ramalho et al (2023), with some adaptations, as follows: 4 g of carbon material was placed inside a 250 mL capacity Soxhlet. This was connected to a boiling flask and a condenser.…”

Section: Methodsmentioning

confidence: 99%

“…Functionalization of carbon material surfaces with oxygen-containing groups was made using nitric acid (HNO 3 , ≥65%) from Sigma-Aldrich and nitrogencontaining groups using urea [(NH 2 ) 2 CO, 98%], and melamine (C 3 H 6 N 6 , 98%, TCI Chemicals) from Thermo Scientific or melamine (C 3 H 6 N 6 , 99%) from Aldrich. 17 with some adaptations, as follows: 4 g of carbon material was placed inside a 250 mL capacity Soxhlet. This was connected to a boiling flask and a condenser.…”

Section: Methodsmentioning

confidence: 99%

“…Melamine (GAC-M) and urea (GAC-U) were the nitrogen precursors adopted for this purpose and nitric acid (GAC-HNO 3 ) for oxygencontaining groups since there is evidence in the literature that these are capable of introducing new active sites and improving the electron-transfer properties of carbon materials. 17,18,21 Table 1 shows the textural data of all the materials tested in this study, obtained from the N 2 adsorption−desorption isotherms at −196 °C. From the isotherms obtained, it can be concluded that the functionalized materials present characteristics of micro-mesoporous carbons.…”

Section: Control Experiments With Different Carbonmentioning

confidence: 99%

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Peroxydisulfate Activation by Carbon Materials for the Degradation of the Herbicide Ametryn in Waters

Graça,

Freitas,

Soares

et al. 2024

ACS Omega

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Brazil, the largest global sugar cane producer, utilizes approximately 10 million hectares for cultivation. However, the increased use of agrochemicals in this industry raises concerns about environmental and human health impacts. Inclusively, ametryn (AMT), a pesticide intensively used in sugar cane plantations, has been detected in several water matrices at concerning levels, which evidences the urgent need for the development of technologies capable of removing this pesticide from the environment. This study investigated the removal efficiency of AMT from aquatic environments via oxidation promoted by persulfate (PS) activation mediated by carbon-based materials, such as graphene, carbon nanotubes, and activated carbon. Granular activated carbon (GAC) emerged as the most suitable material due to its clear catalytic role. A central composite design was used to evaluate and optimize the factors influencing AMT degradation and mineralization, revealing that the initial PS concentration and GAC dosage strongly impact the degradation rate and organic carbon removal in different directions. GAC was submitted to surface functionalization with N-and O-precursors to investigate how this impacts PS activation, and positive enhancements were noted with the latter, with a mineralization degree 9% superior. Experiments with real water matrices evidence the impact of other water constituents on the degradation rate of the target pollutant (k′ 300 ), which was reduced by half when performed in groundwater. Notwithstanding, the system still demonstrated a consistent capacity to remove organic content, ranging from 60 to 50% TOC removal , regardless of the water matrix, indicating that the system might be effective in real contamination scenarios. This research highlights the potential of GAC and its modified version for remediation of AMT-contaminated water remediation.

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Section: Resultsmentioning

confidence: 99%