Preparation of Polyacrylamide Resin and Its Adsorption Properties on 2,4-Dichlorophenoxyacetic Acid
10.11895/j.issn.0253-3820.140888
- VernacularTitle:聚丙烯酰胺树脂的制备及其对2,4-二氯苯氧乙酸的吸附性能研究
- Author:
Meihua MA
;
Xiaozhong WANG
;
Yanru GONG
;
Yuling NIU
;
Yue WANG
;
Huijun WANG
;
Ruiming LUO
;
Bolin GONG
- Publication Type:Journal Article
- Keywords:
Chloromethyl polystyrene resin;
Surface-initiated atom transfer radical;
Adsorption property;
2,4-dichlorophenoxyacetic acid;
Kinetics;
Thermodynamics
- From:
Chinese Journal of Analytical Chemistry
2015;(3):379-386
- CountryChina
- Language:Chinese
-
Abstract:
Polyacrylamide resin was synthesized via surface-initiated atom transfer radical polymerization ( SI-ATRP) method. Acrylic amide ( AM) was grafted onto the surface of the chloromethyl polystyrene resin via SI-ATRP in the CuBr/2, 2'-bipyridine ( Bpy) system as catalyst at room temperature. The compositions of polyacrylamide resin were determined by means of elementary analysis, FT-IR analysis and scanning electron microscopy ( SEM) . The adsorption properties, the parameters of kinetics and the thermodynamics of the resin were evaluated in details, respectively. As the results, adsorption capacity of 2,4-dichlorophenoxyacetic acid (2,4-D) increased with the initial concentrations of solution increasing at room temperature, and its highest adsorption capacity was 111. 0 mg/g with solution concentration of 8 mmol/L. Adsorption isotherm at room temperature was determined and modeled with Langmuir and Freundlich equations. The thermodynamic equilibrium functions were calculated to be ΔG<0,ΔH=268. 2 kJ/mol, ΔS>0, hence, the adsorption was spontaneous, endothermic and entropy increasing. The kinetics fitted the pseudo-second-order well. The polyacrylamide-chloromethyl polystyrene (PAM-CMCPS) resin was used for the adsorption of 2,4-D in orange sample, and good results were obtained.
