Synthesis of hydrazine-grafted guar gum material for the highly effective removal of organic dyes.

The galacylhydrazine modified guar gum (GG-GH) was prepared through oxidation and condensation. GG-GH demonstrated highly efficient removing performance for organic dyes in large volume of water sample solutions, a rapid uptake of dyes was observed and the equilibrium is achieved in 0.5 h. The maximum adsorption capacity for MB, RhB, MeO and BrB were 1522.2 mg g, 1359.96 mg g, 868.83 mg gand 904.7 mg g at room temperature according to the Langmuir adsorption isotherm(R > 0.977). The removal percentage still remains high(>95%) after ten filtration-regeneration cycles, suggesting GG-GH is an excellent gum-based materials for the water treatment with high recyclability and long life.