TY - JOUR
T1 - Adsorption of phenol and nitrophenols by carbon nanospheres
T2 - Effect of pH and ionic strength
AU - Lazo-Cannata, José C.
AU - Nieto-Márquez, Antonio
AU - Jacoby, Andrés
AU - Paredes-Doig, Ana L.
AU - Romero, Amaya
AU - Sun-Kou, María R.
AU - Valverde, José Luis
PY - 2011/7/29
Y1 - 2011/7/29
N2 - In this paper, we report the adsorption of phenol and nitrophenols (2,4 dinitrophenol, 4-nitrophenol and 2-nitrophenol) on a novel carbon material: carbon nanospheres (CNS). CNS were prepared by the direct pyrolysis of benzene and characterized by N2 adsorption-desorption, X-ray diffraction analyses (XRD), scanning and transmission electron microscopy (SEM and TEM) and Raman spectroscopy. Adsorption isotherms were obtained in the range 20-200 mg L1 of phenolic compound, the effect of pH on adsorption was studied at acidic (3), neutral (7) and alkali (11) media. CNS showed a specific competitive adsorption mechanism and nonlinear adsorption isotherms were obtained with the tested phenolic compounds. The adsorption capacity of CNS followed the sequence: 2,4-dinitrophenol > 4-nitrophenol > 2-nitrophenol > phenol. The adsorption was favored under acidic conditions (pH 3), moreover, the presence of ionic salts (e.g. NaCl) in solution increased the ability of CNS to remove phenol and nitrophenols from aqueous solutions (pH 7). Maximum adsorption was obtained with 2,4-dinitrophenol, resulting in an adsorption capacity of 32.9 mggCNS1.
AB - In this paper, we report the adsorption of phenol and nitrophenols (2,4 dinitrophenol, 4-nitrophenol and 2-nitrophenol) on a novel carbon material: carbon nanospheres (CNS). CNS were prepared by the direct pyrolysis of benzene and characterized by N2 adsorption-desorption, X-ray diffraction analyses (XRD), scanning and transmission electron microscopy (SEM and TEM) and Raman spectroscopy. Adsorption isotherms were obtained in the range 20-200 mg L1 of phenolic compound, the effect of pH on adsorption was studied at acidic (3), neutral (7) and alkali (11) media. CNS showed a specific competitive adsorption mechanism and nonlinear adsorption isotherms were obtained with the tested phenolic compounds. The adsorption capacity of CNS followed the sequence: 2,4-dinitrophenol > 4-nitrophenol > 2-nitrophenol > phenol. The adsorption was favored under acidic conditions (pH 3), moreover, the presence of ionic salts (e.g. NaCl) in solution increased the ability of CNS to remove phenol and nitrophenols from aqueous solutions (pH 7). Maximum adsorption was obtained with 2,4-dinitrophenol, resulting in an adsorption capacity of 32.9 mggCNS1.
KW - Adsorption
KW - Carbon nanospheres
KW - Nitrophenols
KW - PH effect
KW - Phenol
UR - http://www.scopus.com/inward/record.url?scp=84865424003&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2011.04.029
DO - 10.1016/j.seppur.2011.04.029
M3 - Article
AN - SCOPUS:84865424003
SN - 1383-5866
VL - 80
SP - 217
EP - 224
JO - Separation and Purification Technology
JF - Separation and Purification Technology
IS - 2
ER -