TY - JOUR
T1 - Efficient amine-sba-15-type adsorbents for treatment of water containing tralevels of pb(II) and cd(II)
AU - Gascón, Victoria
AU - Arencibia, Amaya
AU - Arsuaga, Jesús María
N1 - Publisher Copyright:
© 2019 Desalination Publications. All rights reserved.
PY - 2019/4
Y1 - 2019/4
N2 - Multiamine materials were prepared from SBA-15 mesoporous silica by grafting and impregnation methods. Polyethylenimine and two organosilanes containing amino groups: [amino-ethylamino]-propyltrimethoxysilane (NN), [(2-aminoethylamino)ethylamino]propyl-trimethoxysilane (NNN) were used as supply of the organic chains. These functionalized materials were used as adsorbents for the removal of aqueous lead(II) and cadmium(II), which are included in the EU list of Priority Substances in Water. The prepared materials were characterized by XRD, nitrogen adsorption– desorption, 29 Si MAS NMR, and elemental analysis. Experimental adsorption isotherms were determined up to saturation and successfully reproduced with the Langmuir model. The influence on Pb(II) and Cd(II) adsorption of the type of functional organic chain incorporated and the percentage of functionalization was studied. Likewise, pH effect and sorption mechanism were analyzed. Consequently, maximum adsorption capacities were significantly superior for Pb(II) achieving values as high as 1.37 mmol Pb g –1 . Furthermore, the observed strong affinity between adsorbent and metals at trace-level concentrations evidenced potential industrial application of these adsorbents for Pb(II) and Cd(II) uptake in contaminated water treatments.
AB - Multiamine materials were prepared from SBA-15 mesoporous silica by grafting and impregnation methods. Polyethylenimine and two organosilanes containing amino groups: [amino-ethylamino]-propyltrimethoxysilane (NN), [(2-aminoethylamino)ethylamino]propyl-trimethoxysilane (NNN) were used as supply of the organic chains. These functionalized materials were used as adsorbents for the removal of aqueous lead(II) and cadmium(II), which are included in the EU list of Priority Substances in Water. The prepared materials were characterized by XRD, nitrogen adsorption– desorption, 29 Si MAS NMR, and elemental analysis. Experimental adsorption isotherms were determined up to saturation and successfully reproduced with the Langmuir model. The influence on Pb(II) and Cd(II) adsorption of the type of functional organic chain incorporated and the percentage of functionalization was studied. Likewise, pH effect and sorption mechanism were analyzed. Consequently, maximum adsorption capacities were significantly superior for Pb(II) achieving values as high as 1.37 mmol Pb g –1 . Furthermore, the observed strong affinity between adsorbent and metals at trace-level concentrations evidenced potential industrial application of these adsorbents for Pb(II) and Cd(II) uptake in contaminated water treatments.
KW - Amine-functionalized SBA-15
KW - Lead and cadmium removal
KW - Selective adsorption
KW - Water treatment
UR - http://www.scopus.com/inward/record.url?scp=85064072281&partnerID=8YFLogxK
U2 - 10.5004/dwt.2019.23601
DO - 10.5004/dwt.2019.23601
M3 - Article
AN - SCOPUS:85064072281
SN - 1944-3994
VL - 146
SP - 210
EP - 226
JO - Desalination and Water Treatment
JF - Desalination and Water Treatment
ER -