Preparation of silica gel supported amidoxime adsorbents for selective adsorption of Hg(II) from aqueous solution

2012 ◽  
Vol 209 ◽  
pp. 235-244 ◽  
Author(s):  
Jie Chen ◽  
Rongjun Qu ◽  
Ying Zhang ◽  
Changmei Sun ◽  
Chunhua Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Silica Gel ◽  
Selective Adsorption

scholarly journals Sulfobetaine Cryogels for Preferential Adsorption of Methyl Orange from Mixed Dye Solutions

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 208
Author(s):  
Ramona B. J. Ihlenburg ◽  
Anne-Catherine Lehnen ◽  
Joachim Koetz ◽  
Andreas Taubert
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Methyl Orange ◽  
Dye Removal ◽  
Selective Adsorption ◽  
Water Soluble ◽  
Organic Substances ◽  
Preferential Adsorption ◽  
Dimethyl Ammonium ◽  
Dye Solutions

New cryogels for selective dye removal from aqueous solution were prepared by free radical polymerization from the highly water-soluble crosslinker N,N,N’,N’-tetramethyl-N,N’-bis(2-ethylmethacrylate)-propyl-1,3-diammonium dibromide and the sulfobetaine monomer 2-(N-3-sulfopropyl-N,N-dimethyl ammonium)ethyl methacrylate. The resulting white and opaque cryogels have micrometer sized pores with a smaller substructure. They adsorb methyl orange (MO) but not methylene blue (MB) from aqueous solution. Mixtures of MO and MB can be separated through selective adsorption of the MO to the cryogels while the MB remains in solution. The resulting cryogels are thus candidates for the removal of hazardous organic substances, as exemplified by MO and MB, from water. Clearly, it is possible that the cryogels are also potentially interesting for removal of other compounds such as pharmaceuticals or pesticides, but this must be investigated further.

scholarly journals Changes in the Surface Area of Silica-supported 12-Molybdophosphoric Acid in Relation to the Degree of Loading and the Calcination Temperature

1994 ◽  
Vol 11 (2) ◽  
pp. 83-93 ◽  
Author(s):  
L.B. Khalil ◽  
W.E. Mourad ◽  
B.S. Girgis
Keyword(s):  
Aqueous Solution ◽  
Surface Area ◽  
Silica Gel ◽  
Heteropoly Acid ◽  
Surface Acidity ◽  
Molybdophosphoric Acid ◽  
Surface Species ◽  
Considerable Decrease ◽  
Acidic Aqueous Solution

A technical silica gel (Grace-113) was impregnated with 12-molybdophosphoric solution to attain loadings of 0.72–13.4 wt.%. The air-dried solids were then calcined for 3 h at 400, 600 and 800°C, respectively, followed by determination of their N2 adsorption isotherms. The silica gel was thermally stable and suffered about 15% loss in area at 800°C. The impregnated silicas showed considerable decrease in surface area as a function of their heteropoly acid content. Two processes are suggested as taking part in the modification of pore structure: (1) diffusion of the aqueous heteropoly acid solution and its subsequent deposition; and (2) dissolution of silica gel in the acidic aqueous solution followed by interaction with HPMo to form either molybdosilicate or P–Si exchange products. Correlation with the previously studied catalytic conversion of isopropanol indicated that the activity was independent of the surface area. Catalytic dehydration on the 600°C and 800°C products seems to be associated with silicate, molybdate or MoO3 surface species rather than being due to surface acidity or the extent of the surface area.

Functionalized polyoxometalate-based metal–organic cuboctahedra for selective adsorption toward cationic dyes in aqueous solution

2018 ◽  
Vol 47 (37) ◽  
pp. 12979-12983 ◽  
Author(s):  
Ya-Ru Gong ◽  
Wei-Chao Chen ◽  
Liang Zhao ◽  
Kui-Zhan Shao ◽  
Xin-Long Wang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Selective Adsorption ◽  
Cationic Dyes ◽  
Carboxylate Ligand ◽  
Metal Organic

Two new VMOPs with cuboctahedral geometries were synthesized based on [V6O6(OCH3)9X] (X = VO4 or SO4) and the rigid tridentate carboxylate ligand H3TATB, which present selective adsorption toward cationic dyes in aqueous solution.

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