Aqueous heavy metals removal on amine-functionalized Si-MCM-41 and Si-MCM-48.
Ordered mesoporous silica with hexagonal and cubic structure, type MCM-41 and MCM-48 respectively, were synthesized under basic media using pure silica, cetyltrimethylammonium bromide and tetramethylammonium hydroxide, for MCM-41 and tetraethylorthosilica, cetyltrimethylammonium and NaOH for MCM-48. The expanded materials were prepared by post-synthesis method with N-N dimethyldodecylamine (DMDDA) and dodecylamine (DDA). Small angle X-ray diffraction, nitrogen adsorption-desorption measurements, FT-IR and thermogravimetry were used to characterize the samples. The expanded materials were tested for adsorption of Cd(2+), Co(2+), Cu(2+) and Pb(2+) in aqueous solution. Aminated materials were found to be fast adsorbents for metallic ions cation with affinity for Cu(2+), Pb(2+), than for Cd(2+) and Co(2+) from single solution. In mixed metallic ions cation solutions, competition by the adsorption sites is likely to occur, the adsorption preference is for Cu(2+)and Pb(2+). The kinetic of the reaction is very rapid and follow pseudo-second order and clearly indicated that Langmuir model describe better the for metal ions adsorption on aminated mesoporous material than Freundlich model.
Benhamou
A
A
Département de Chimie, Faculté des Sciences, Université des Sciences et Technologie d'Oran M Boudiaf, Oran El M'Nouer, Algeria. abdoubenhamou@gmail.com
Baudu
M
M
Derriche
Z
Z
Basly
J P
JP
D000327:Adsorption; D000588:Amines / Q000737:chemistry*; D002412:Cations; D003300:Copper / Q000737:chemistry; D007477:Ions; D007700:Kinetics; D007854:Lead / Q000737:chemistry; D019216:Metals, Heavy / Q000737:chemistry / Q000302:isolation & purification*; D009584:Nitrogen / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods; D014961:X-Ray Diffraction
D000588:Amines; D002412:Cations; D007477:Ions; C509968:MCM-41; D019216:Metals, Heavy; D014874:Water Pollutants, Chemical; D007854:Lead; D012822:Silicon Dioxide; D003300:Copper; D009584:Nitrogen