Synthesis of graft copolymer (CmgOH-g-NVP) and study of physicochemical properties: Characterization and application

The synthesis of graft copolymer (partially carboxymethylated guar gum-g-N-vinyl-2-pyrrolidone) is carried out in nitrogen atmosphere using potassium peroxymonosulphate and glycolic acid as redox system. The effect of reaction variables including the concentration of N-vinyl-2-pyrrolidone (8 × 10−2 to 24 × 10−2) mol dm−3, potassium peroxymonosulphate (6 × 10−3 to 22 × 10−3) mol dm−3, glycolic acid (0.6 × 10−3 to 4.0 × 10−3) mol dm−3, sulphuric acid (1 × 10−3 to 3 × 10−3) mol dm−3), partially carboxymethylated guar gum (0.6–1.4) g dm−3 as well as time duration (60–180) min and temperature (30–50) °C has been studied. The water swelling capacity of graft copolymer is investigated. Flocculation property for both coking and non-coking coals is studied for the treatment of coal mine waste water. The graft copolymer has been characterized by Fourier transform infrared spectroscopy and thermogravimetic analysis.