Selective nitrogen functionalization of phosphorus-containing activated carbons

Palomo, José; Ternero-Hidalgo, Juan José; Rosas, Juana M.; Rodríguez-Mirasol, José; Cordero, Tomás

doi:10.1016/j.fuproc.2016.10.006

Cited by 24 publications

(12 citation statements)

References 38 publications

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“…Phosphoric acid-activated carbon can graft more surface nitrogen during oxidation with HNO 3 than a carbon prepared by CO 2 activation [348,349]. The surface nitrogen is mainly in form of nitro groups on the surface of P-containing carbons, while the N species in P-free carbons are mainly in lower oxidation states.…”

Section: Promotion Of Carbon Functionalizationmentioning

confidence: 99%

Phosphorus-containing carbons: Preparation, properties and utilization

Puziy

Poddubnaya

Gawdzik

et al. 2020

Carbon

117

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Section: Promotion Of Carbon Functionalizationmentioning

confidence: 99%

Phosphorus-containing carbons: Preparation, properties and utilization

Puziy

Poddubnaya

Gawdzik

et al. 2020

Carbon

117

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“…The obtained sample was washed with distilled water at a constant pH until elution was reached. The sample was then dried for 24 h (Palomo et al 2017).…”

Section: Experimental Preparation Of the Activated Carbon Samplesmentioning

confidence: 99%

“…Lorenc-Grabowska et al (2013) used nitric acid as an activator to treat the raw materials and perform a redox reaction. Palomo et al (2017) used ammonia activation of raw materials at high temperature. Because the surface of the activated carbons contains different nitrogenous functional groups, its physical and chemical properties are optimized.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of bio-based activated carbon from fish scales

Zhang

2020

BioRes

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The object of this study was to prepare activated carbons containing nitrogenous functional groups by a chemical method from nitrogen-containing raw materials. Fish (Ctenopharyngodon idellus) scales were impregnated with phosphoric acid (H3PO4) and activated at varied temperatures. The adsorption ability, structural characteristics, surface chemistry, and morphology of the activated carbons were characterized by methylene blue and iodine values, nitrogen adsorption, the Boehm method, scanning electron microscopy (SEM), and X-ray photoelectron spectroscopy (XPS). The total alkaline groups content of the activated carbon produced from fish scales was 0.4330 mmol/g, the total acidic groups was 1.68 mmol/g, the Brunauer–Emmett–Teller (BET) surface area was 501 cm2/g, and the total pore volume was 0.284 cm3/g. The average pore diameter was 1.94 nm under an activation temperature of 550 °C, an activation time of 1 h, and an impregnation ratio of 2. As a result of this study, nitrogenous functional groups that contained acid-base amphoteric adsorbent were produced.

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“…Another step which can help is N enrichment (also called N-doping in the literature) to modify the surface composition of the AC. Using a different source of nitrogen for surface modification will provide the ACs with additional physiochemical properties, which is beneficial in many applications [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Hexavalent Chromium and Divalent Lead Ions on the Nitrogen-Enriched Chitosan-Based Activated Carbon

2021

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Optimizing the physicochemical properties of the chitosan-based activated carbon (Ch-ACs) can greatly enhance its performance toward heavy metal removal from contaminated water. Herein, Ch was converted into a high surface area (1556 m2/g) and porous (0.69 cm3/g) ACs with large content of nitrogen (~16 wt%) using K2CO3 activator and urea as nitrogen-enrichment agents. The prepared Ch-ACs were tested for the removal of Cr(VI) and Pb(II) at different pH, initial metal ions concentration, time, activated carbon dosage, and temperature. For Cr(VI), the best removal was at pH = 2, while for Pb(II) the best pH for its removal was in the range of 4–6. At 25 °C, the Temkin model gives the best fit for the adsorption of Cr(VI), while the Langmuir model was found to be better for Pb(II) ions. The kinetics of adsorption of both heavy metal ions were found to be well-fitted by a pseudo-second-order model. The findings show that the efficiency and the green properties (availability, recyclability, and cost effectiveness) of the developed adsorbent made it a good candidate for wastewaters treatment. As preliminary work, the prepared sorbent was also tested regarding the removal of heavy metals and other contaminations from real wastewater and the obtained results were found to be promising.

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Selective nitrogen functionalization of phosphorus-containing activated carbons

Cited by 24 publications

References 38 publications

Phosphorus-containing carbons: Preparation, properties and utilization

Phosphorus-containing carbons: Preparation, properties and utilization

Preparation and characterization of bio-based activated carbon from fish scales

Adsorption of Hexavalent Chromium and Divalent Lead Ions on the Nitrogen-Enriched Chitosan-Based Activated Carbon

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