RT Journal Article
T1 Enhancement of p-nitrophenol adsorption capacity through N2-thermal-based treatment of activated carbons
A1 Álvarez Torrellas, Silvia
A1 Martín Martínez, María
A1 Gomes, Helder
A1 Ovejero Escudero, Gabriel
A1 García González, Julián
AB In this work several activated carbons showing different textural and chemical properties were obtained by chemical and physical activation methods, using a lignocellulosic material (peach stones) as precursor. The activated carbon resulting from the chemical activation, namely as CAC, revealed the best textural properties (SBET = 1521 m2 g−1, pore volume = 0.90 cm3 g−1) and an acidic character. It was found that the activated carbon obtained at 300 °C (under air atmosphere, PAC_air), and those synthesized at 750 °C in presence of N2 flow with bubbling of water/12 M H3PO4 solution (PAC_N2(H2O)/PAC_N2(H3PO4)), respectively, revealed worse textural properties, compared to CAC. Two functionalization treatments, by using sulphuric acid at boiling temperature (PACS) and nitric acid-urea-N2 heating at 800 °C (PAC-NUT), were applied to PAC_air, in order to enhance the adsorption ability of the carbon material. Several techniques were carried out to characterize the physical and chemical properties of the obtained carbon materials. The modification treatments had influence on the carbon surface properties, since the nitric acid-urea-N2 heating treatment led to a carbon material with highly-improved properties (SBET = 679 m2 g−1, pHIEP = 5.3).Accordingly, the original and modified-carbon materials were tested as adsorbents to remove 4-nitrophenol (4-NP), assessing batch and fixed-bed column adsorption tests. PAC-NUT carbon offered the best adsorption behavior (qe = 234 mg g−1), showing a high ability for the removal of 4-NP from water.
PB Elsevier
SN 0169-4332
YR 2017
FD 2017
LK https://hdl.handle.net/20.500.14352/95850
UL https://hdl.handle.net/20.500.14352/95850
LA eng
NO Ministerio de Economia y ́Competitividad (España)
NO Comunidad de Madrid
NO European Commission
NO Portuguese Foundation for Science and Technology
DS Docta Complutense
RD 6 abr 2025