TY - JOUR
T1 - Adsorption of arsenite and arsenate on binary and ternary magnetic nanocomposites with high iron oxide content
AU - Ramos Guivar, Juan A.
AU - Bustamante D., Angel
AU - Gonzalez, J. C.
AU - Sanches, Edgar A.
AU - Morales, M. A.
AU - Raez, Julia M.
AU - López-Muñoz, María José
AU - Arencibia, Amaya
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/10/1
Y1 - 2018/10/1
N2 - Bare maghemite nanoparticles (Nps), binary, and ternary magnetic nanocomposites prepared with titanium dioxide (TiO 2 ) and graphene oxide (GO) were synthesized by a facile and cheap co-precipitation chemical route, and used as magnetic nanoadsorbents to remove arsenite (As(III)) and arsenate (As(V)) from water. The structural, morphological, magnetic and surface properties were analyzed by XRD, TEM microscopy, FTIR and Raman vibrational spectroscopy, Mössbauer technique and N 2 adsorption-desorption measurements. It was found that materials were composed of maghemite nanoparticles with crystallites diameters varying from 9 to 13 nm for bare Nps, binary and ternary nanocomposites, these nanocomposites contain a high percentage of maghemite phase (80%). The presence of TiO 2 and GO in the binary and ternary materials was also confirmed. All the samples were found to show magnetic properties and a slight porosity, with a specific surface area that increases up to 82 m 2 /g when the metal oxides Nps were supported on GO. The aqueous arsenic adsorption performance was studied from kinetic and equilibrium point of view, and the pH adsorption capacity dependence was evaluated aiming to explain the adsorption mechanism. The three nanocomposites prepared in this work exhibit high adsorption capacity for arsenic species, with values of maximum adsorption capacity ranging from 83.1 to 110.4 mg/g for As(III) and from 90.2 to 127.2 mg/g for As(V) from bare to ternary nanocomposites, being possible to be separated with a permanent magnet of neodymium (Nd) in less than 10 min. Therefore, these nanosystems can be proposed as good adsorbents for both arsenic species from water.
AB - Bare maghemite nanoparticles (Nps), binary, and ternary magnetic nanocomposites prepared with titanium dioxide (TiO 2 ) and graphene oxide (GO) were synthesized by a facile and cheap co-precipitation chemical route, and used as magnetic nanoadsorbents to remove arsenite (As(III)) and arsenate (As(V)) from water. The structural, morphological, magnetic and surface properties were analyzed by XRD, TEM microscopy, FTIR and Raman vibrational spectroscopy, Mössbauer technique and N 2 adsorption-desorption measurements. It was found that materials were composed of maghemite nanoparticles with crystallites diameters varying from 9 to 13 nm for bare Nps, binary and ternary nanocomposites, these nanocomposites contain a high percentage of maghemite phase (80%). The presence of TiO 2 and GO in the binary and ternary materials was also confirmed. All the samples were found to show magnetic properties and a slight porosity, with a specific surface area that increases up to 82 m 2 /g when the metal oxides Nps were supported on GO. The aqueous arsenic adsorption performance was studied from kinetic and equilibrium point of view, and the pH adsorption capacity dependence was evaluated aiming to explain the adsorption mechanism. The three nanocomposites prepared in this work exhibit high adsorption capacity for arsenic species, with values of maximum adsorption capacity ranging from 83.1 to 110.4 mg/g for As(III) and from 90.2 to 127.2 mg/g for As(V) from bare to ternary nanocomposites, being possible to be separated with a permanent magnet of neodymium (Nd) in less than 10 min. Therefore, these nanosystems can be proposed as good adsorbents for both arsenic species from water.
KW - Arsenite and arsenate adsorption
KW - Bare maghemite Nps
KW - Binary and ternary magnetic nanocomposites
UR - http://www.scopus.com/inward/record.url?scp=85047424710&partnerID=8YFLogxK
U2 - 10.1016/j.apsusc.2018.04.248
DO - 10.1016/j.apsusc.2018.04.248
M3 - Artículo
AN - SCOPUS:85047424710
SN - 0169-4332
VL - 454
SP - 87
EP - 100
JO - Applied Surface Science
JF - Applied Surface Science
ER -