Research on the Graft Copolymerization of EH-lignin with acrylamide

Run Fang, Xian-Su Cheng, Jian Fu, Zuan-Bin Zheng

1College of Material Science and Engineering, Fuzhou University, Fuzhou 350002, China; 2Department of Chemistry and Chemical Engineering, Minjiang University, Fuzhou 350011, China..
College of Material Science and Engineering, Fuzhou University, Fuzhou 350002, China.

DOI: 10.4236/ns.2009.11004                

Abstract

Lignin isolated from enzymatic hydrolyzed corn-stalks (EH-lignin) is a renewable natural polymer noted for its versatility and applicability in a vari-ety of uses. Graft copolymerization of EH-lignin with acrylamide (AM) and the application of this copolymer as a flocculant in dye wastewater treatment were studied in this article. The influ-ences of some factors on yield of copolymer and the grafting ratio were investigated and the structure of EH-lignin/AM graft copolymer was characterized by FT-IR. According to the yield and the grafting ratio, the optimum conditions for graft copolymerization were as follows: initiator K2S2O8-Na2S2O3 with a quantity 3 wt% of EH-lignin, mass ratio of AM to EH-lignin was 2~3, reaction time 4h and temperature at 50℃. It was found that the absorption capacity of graft copolymer to two azo-dyes was enhanced with the increase of grafting ratio. Furthermore, the residue concen-tration of EH-lignin/AM graft copolymer remained in the supernatant after flocculation was much lower than that of pure EH-lignin.

Keywords

Lignin; Acrylamide; Graft Copolymerization; Dye Wastewater; Decoloration

Conflicts of Interest

The authors declare no conflicts of interest.

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