Bifunctional heterogeneous catalysts derived from the coordination of adenosine monophosphate to Sn(IV) for effective conversion of sucrose to 5-hydroxymethylfurfural

2021 ◽  
Author(s):  
Chenyu Wang ◽  
Lutong Jiao ◽  
Han Meng ◽  
Peijun Ji
Keyword(s):  
Metal Ions ◽  
Functional Groups ◽  
Heterogeneous Catalysts ◽  
Adenosine Monophosphate

Adenosine 5’-monophosphate (AMP) with multiple functional groups can bind to various metal ions. In this work, AMP has been used as the ligand to coordinate Sn(IV) for the synthesis of...

scholarly journals Analysis of Cr(III) ions adsorption on the surface of algae: implications for the removal of heavy metal ions from water

2021 ◽  
Vol 4 (10(112)) ◽  
pp. 14-23
Author(s):  
Zhadra Tattibayeva ◽  
Sagdat Tazhibayeva ◽  
Wojciech Kujawski ◽  
Bolatkhan Zayadan ◽  
Kuanyshbek Мusabekov ◽  
...  
Keyword(s):  
Cell Surface ◽  
Metal Ions ◽  
Functional Groups ◽  
Ζ Potential ◽  
Adsorption Data ◽  
Abnormal Increase ◽  
Ph Range ◽  
Langmuir And Freundlich Models ◽  
Phosphate Groups ◽  
Comprehensive Study

For purposeful control of the adsorption process, a comprehensive study of the properties of the original cells and the effect of metal ions on them is necessary. In this regard, the features of the adsorption of Cr(III) ions on the cell surface of Spirulina platensis algae were studied. FTIR spectroscopy revealed that the main functional groups responsible for the binding of Cr(III) ions are carboxyl, hydroxyl, amino, and phosphate groups on the surface of algae. The adsorption data were processed using the Langmuir and Freundlich models. It is shown that the maximum adsorption of Cr(III) ions on the surface of algae cells is 31.25 mg/g. The Freundlich constant 1/n is 0.65. The study of the effect of the concentration of Cr(III) ions on the Zeta-potential of algae cells revealed an abnormal increase in the negative value of the ζ – potential at 10–5 mol/L, caused by the release of an additional amount of anionic functional groups to the surface. A further increase in the concentration of Cr(III) ions in the algae suspension leads to a decrease in the ζ – potential and recharge of the surface at C>10–2 mol/L. It was found that the adsorption of Cr(III) ions also affects the morphology of the cell surface. If before contact with Cr(III) ions, the surface of algae cells is represented as a uniform green grid, after adsorption of Cr(III) ions, the surface becomes green-brown, with swollen spirals. The study of the effect of pH on the adsorption and desorption processes shows an increase in the desorption of Cr(III) ions from the surface of algae during acidification of the medium. The adsorption reaches a maximum value in the pH range of 6–7. In the region of optimal Cr(III)/biosorbent ion ratios, the recovery rate of Cr(III) reaches 98.5–99.3 %.

Solvent Extraction of Some Metal Ions with Lipophilic Chitosan Chemically Modified with Functional Groups of Dithiocarbamate

2001 ◽  
Vol 30 (7) ◽  
pp. 698-699 ◽  
Author(s):  
Katsutoshi Inoue ◽  
Kazuharu Yoshizuka ◽  
Keisuke Ohto ◽  
Hirofumi Nakagawa
Keyword(s):  
Solvent Extraction ◽  
Metal Ions ◽  
Functional Groups ◽  
Chemically Modified

Bis-ammonium immobilized polystyrenes with co-catalyzing functional end groups as efficient and reusable heterogeneous catalysts for synthesis of cyclic carbonate from CO2 and epoxides

RSC Advances ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 2217-2224 ◽  
Author(s):  
Qingyuan Deng ◽  
Gaohong He ◽  
Yu Pan ◽  
Xuehua Ruan ◽  
Wenji Zheng ◽  
...  
Keyword(s):  
Functional Groups ◽  
Heterogeneous Catalysts ◽  
Cyclic Carbonate ◽  
Efficient Synthesis ◽  
End Groups

Novel bis-ammonium immobilized polystyrenes with co-catalyzing functional groups were prepared for efficient synthesis of cyclic carbonate from CO2 and epoxides.

scholarly journals Aqueous electromigration of single-walled carbon nanotubes and co-electromigration with copper ions

Nanoscale ◽  
2018 ◽  
Vol 10 (41) ◽  
pp. 19628-19637 ◽  
Author(s):  
Pavan M. V. Raja ◽  
Gibran L. Esquenazi ◽  
Kourtney D. Wright ◽  
Cathren E. Gowenlock ◽  
Bruce E. Brinson ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Metal Ions ◽  
Functional Groups ◽  
Copper Ions ◽  
Single Walled Carbon Nanotubes ◽  
Surface Functional Groups ◽  
Single Walled Carbon ◽  
Walled Carbon Nanotubes

The direction of electromigration of SWCNTs in the absence of surfactant depends on the presence of catalyst residue, surface functional groups and adsorbed metal ions.

THE STUDY OF THE REACTION BETWEEN CHITOSAN AND MELAMINE DERIVATIVE

2020 ◽  
Vol 54 (1 (251)) ◽  
pp. 83-85
Author(s):  
M.L. Yeritsyan ◽  
K.M. Yeritsyan ◽  
V.M. Mavisakalyan ◽  
A.M. Arustamyan ◽  
R.P. Mkhitaryan
Keyword(s):  
Heavy Metal ◽  
Aqueous Solutions ◽  
Metal Ions ◽  
Functional Groups ◽  
Heavy Metal Ions ◽  
Chitosan Derivative

The reaction between urea and melamine was studied. The reaction resulted in tris-carbamide derivative of melamine. During the reaction between the melamine derivative and the glycoside group of chitosan the sim-triazine functional groups were formed, which are included in the structure of synthesized derivative of chitosan. The synthesized derivative of chitosan was tested. It is recommended to use this chitosan derivative as an absorbent for the separation of heavy metal ions such as Cd2+, Hg1+, Hg2+, Co2+, Ag1+, As3+, As5+, etc. from the aqueous solutions of salts.

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