Comparison and evaluation of five types of imidazole-modified silica adsorbents for the removal of 2,4-dinitrophenol from water samples with the methyl group at different positions of imidazolium ring

2013 ◽  
Vol 260 ◽  
pp. 955-966 ◽  
Author(s):  
Zhike Wang ◽  
Cunling Ye ◽  
Juan Li ◽  
Heping Wang ◽  
Han Zhang
Keyword(s):  
Water Samples ◽  
Modified Silica ◽  
Methyl Group ◽  
Silica Adsorbents ◽  
Imidazolium Ring

Kinetics of the Imidazolium Ring-Opening of mRNA 5'-cap Analogs in Aqueous Alkali

2006 ◽  
Vol 71 (4) ◽  
pp. 567-578 ◽  
Author(s):  
Alicja Stachelska ◽  
Zbigniew J. Wieczorek ◽  
Janusz Stępiński ◽  
Marzena Jankowska-Anyszka ◽  
Harri Lönnberg ◽  
...  
Keyword(s):  
Electrostatic Interaction ◽  
Ring Opening ◽  
Nucleophilic Attack ◽  
Amino Groups ◽  
Hydroxide Ion ◽  
Methyl Group ◽  
Structural Modifications ◽  
Alkyl Groups ◽  
Imidazolium Ring ◽  
Kinetics Of

Second-order rate constants for the hydroxide-ion-catalyzed imidazolium ring-opening of several mono- and dinucleosidic analogs of mRNA 5'-cap have been determined. Intramolecular stacking of the two nucleobases in the dinucleosidic analogs, m7GpppN (m7G = 7-methylguanosine, N = 5'-linked nucleoside), and electrostatic interaction between the N-alkylated imidazolium ring and phosphate moiety have been shown to shield the m7G moiety against the nucleophilic attack of hydroxide ion. In addition, the effect of methylation of the nucleobase amino groups and replacement of the 7-methyl group with other alkyl groups have been studied. The influence of all the structural modifications studied turned out to be modest, the cleavage rates of the most and least reactive analogs (with the exception of non-phosphorylated nucleosides) differing only by a factor of 5.

Radiation synthesis of imidazolium-based ionic liquids modified silica adsorbents for ReO4- adsorption

2021 ◽  
Author(s):  
Kangjun Xie ◽  
Zhen Dong ◽  
Nan Wang ◽  
Wei Qi ◽  
Long Zhao
Keyword(s):  
Ionic Liquids ◽  
Environmental Security ◽  
Radioactive Wastes ◽  
Modified Silica ◽  
Radiation Synthesis ◽  
Silica Adsorbents ◽  
Selective Elimination

The selective elimination of radioactive TcO4- from radioactive wastes is becoming increasingly critical for environmental security. In this work, a series of novel adsorbents (Si-IL-X, X= NO3, Cl, BF4, NTf2)...

Metal-modified silica adsorbents for removal of humic substances in water

2005 ◽  
Vol 283 (2) ◽  
pp. 300-310 ◽  
Author(s):  
Takeshi Moriguchi ◽  
Kazuyuki Yano ◽  
Muneaki Tahara ◽  
Kazuhiko Yaguchi
Keyword(s):  
Humic Substances ◽  
Modified Silica ◽  
Silica Adsorbents

scholarly journals Sol–gel processed pyridinium ionic liquid-modified silica as a new sorbent for separation and quantification of iron in water samples

2016 ◽  
Vol 9 ◽  
pp. S587-S594 ◽  
Author(s):  
H. Abdolmohammad-Zadeh ◽  
M. Galeh-Assadi ◽  
S. Shabkhizan ◽  
H. Mousazadeh
Keyword(s):  
Ionic Liquid ◽  
Water Samples ◽  
Sol Gel ◽  
Modified Silica

Modified Silica Adsorbents for Toluene Adsorption under Dry and Humid Conditions: Impacts of Pore Size and Surface Chemistry

Langmuir ◽  
2019 ◽  
Vol 35 (27) ◽  
pp. 8927-8934 ◽  
Author(s):  
Shuai Liu ◽  
Yue Peng ◽  
Tao Yan ◽  
Yani Zhang ◽  
John Crittenden ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Pore Size ◽  
Modified Silica ◽  
Silica Adsorbents
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