TY - JOUR
T1 - Functionalized sol-gels for mercury(II) separation
T2 - A comparison of mesoporous materials prepared with and without surfactant templates
AU - Im, Hee Jung
AU - Barnes, Craig E.
AU - Dai, Sheng
AU - Xue, Ziling
PY - 2004/5/21
Y1 - 2004/5/21
N2 - Granular silica gels 1b (7.0 mol% ligand) and 1c (17.0 mol% ligand) containing different amounts of tethered mercapto ligand HS(CH2)3Si(O-)3 were prepared in one step from the co-hydrolysis of HS(CH2)3Si(OMe) 3 and Si(OMe)4. Analyses of 1b revealed that it was mesoporous (pore diameter: ca. 50 Å) with a large surface area (471 m2/g). In 0.5, 5.0, 50, and 500 ppm Hg2+ solutions, 1b was found to have Hg2+ uptake capacities comparable to those of sub-micron mesoporous powders prepared with two different surfactants in the current studies. 1b and 1c removed Hg2+ ions to be below 5 × 10-5 ppm (the detection limit of atomic absorption) from 0.368 and 50 ppm solutions, respectively. The granular 1b and 1c are easier to prepare and handle, and may offer an alternative to sub-micron powders prepared with surfactants for Hg(II) uptake.
AB - Granular silica gels 1b (7.0 mol% ligand) and 1c (17.0 mol% ligand) containing different amounts of tethered mercapto ligand HS(CH2)3Si(O-)3 were prepared in one step from the co-hydrolysis of HS(CH2)3Si(OMe) 3 and Si(OMe)4. Analyses of 1b revealed that it was mesoporous (pore diameter: ca. 50 Å) with a large surface area (471 m2/g). In 0.5, 5.0, 50, and 500 ppm Hg2+ solutions, 1b was found to have Hg2+ uptake capacities comparable to those of sub-micron mesoporous powders prepared with two different surfactants in the current studies. 1b and 1c removed Hg2+ ions to be below 5 × 10-5 ppm (the detection limit of atomic absorption) from 0.368 and 50 ppm solutions, respectively. The granular 1b and 1c are easier to prepare and handle, and may offer an alternative to sub-micron powders prepared with surfactants for Hg(II) uptake.
KW - Granular silica gels
KW - Hg(II) separation
KW - Mercapto ligand
KW - Mesoporous
UR - http://www.scopus.com/inward/record.url?scp=2142657322&partnerID=8YFLogxK
U2 - 10.1016/j.micromeso.2004.03.002
DO - 10.1016/j.micromeso.2004.03.002
M3 - Article
AN - SCOPUS:2142657322
SN - 1387-1811
VL - 70
SP - 57
EP - 62
JO - Microporous and Mesoporous Materials
JF - Microporous and Mesoporous Materials
IS - 1-3
ER -