Effect of Catalyst Deactivation on Polymerization of Electrolytes by Surface-Confined Atom Transfer Radical Polymerization in Aqueous Solutions

2006 ◽  
Vol 39 (4) ◽  
pp. 1376-1383 ◽  
Author(s):  
Amit Y. Sankhe ◽  
Scott M. Husson ◽  
S. Michael Kilbey
Keyword(s):  
Aqueous Solutions ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Catalyst Deactivation ◽  
Atom Transfer ◽  
Confined Atom

scholarly journals Adsorption of Pb2+ from Aqueous Solutions Using Novel Functionalized Corncobs via Atom Transfer Radical Polymerization

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1715 ◽  
Author(s):  
Shanglong Chen ◽  
Wei Zhao
Keyword(s):  
Aqueous Solutions ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Electrostatic Interactions ◽  
Adsorption Process ◽  
Atom Transfer ◽  
Order Kinetic ◽  
Solution Ph ◽  
Carboxylate Groups ◽  
Working Solution

The present study developed novel functionalized corncobs introducing brushes with dense and active carboxyl groups (–COOH), named MC-g-PAA, for the highly efficient adsorption of Pb2+ from aqueous solutions. MC-g-PAA were synthesized via atom transfer radical polymerization (ATRP) and characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The amount of Pb2+ adsorbed on MC-g-PAA by hydrolysis with t-BuOK was 2.28 times greater than that with NaOH, attributed to the larger steric effect of t-BuOK, which reduced the hydrolysis of the bromo-ester groups. The influence of different parameters including the solid/liquid ratio, working solution pH, sorption temperature, and initial concentration and sorption time on the adsorption of Pb2+ were investigated in detail in batch experiments. Thermodynamic studies have shown that the adsorption process was spontaneous, endothermic, and accompanied by an increase in randomness. A better fit for the isotherm data was obtained using the Langmuir model than for the other four models and the maximum amount ( q max ) of Pb2+ adsorbed on MC-g-PAA was 342.47 mg/g, which is 21.11 times greater when compared with that of pristine corncobs (16.22 mg/g). The adsorption of Pb2+ on MC-g-PAA was very fast and followed the pseudo-second-order kinetic equation with a correlation coefficient of 0.99999. This monolayer adsorption process was dominated by chemical adsorption, and may proceed according to complexation and electrostatic interactions between Pb2+ and the carboxylate groups. This study indicated that MC-g-PAA could be successfully used as an adsorbent for the removal of Pb2+ from aqueous solutions due to its excellent efficiency.

Synthetic of Polydivinylbenzene Block Hyperbranched Polyethylene Copolymers via Atom Transfer Radical Polymerization

2019 ◽  
Author(s):  
Shiyun Li ◽  
◽  
Ling Zhang ◽  
Shang Shang ◽  
Haijun Zhou ◽  
...  
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Atom Transfer
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