期刊
JOURNAL OF SUPERCRITICAL FLUIDS
卷 62, 期 -, 页码 232-239出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.supflu.2011.10.020
关键词
Supercritical carbon dioxide; Precipitation polymerization; Hydroxymethylacrylamide; Sorbent; Methylene blue
资金
- Natural Science Foundation of China [50863004, 51003090]
A novel, pH-sensitive sorbent was synthesized by precipitation polymerization in supercritical carbon dioxide at pressures ranging from 14 MPa to 26 MPa. The copolymers of hydroxymethylacrylamide and acrylic acid were cross-linked by N,N'-methylenebisacrylamide. Aggregate particles with diameters of approximately 200 nm were observed by scanning electron microscopy, and surface area analysis showed that the surface area and pore volume of a sorbent prepared at a pressure of 26 MPa are 50.38 m(2)/g and 0.101 m(3)/g, respectively. The polymer has good thermal stability. Additionally, the adsorption behaviors of methylene blue (MB) by the copolymers were evaluated. The effect of reaction pressure, cross-linker ratio, polymer structure, pH values of solution, MB concentration, and adsorption time on adsorption capacity was also investigated. The results revealed that cross-linked copolymer has a high adsorption capacity of 343.23 mg/g for MB under the conditions of pH 9 and crosslinker ratio of 5.8%. The findings show that cross-linked copolymer materials can be used for large-scale dye adsorption. (c) 2011 Elsevier B.V. All rights reserved.
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