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(-1), 1359.96 mg g(-1), 868.83 mg g(-1)and 904.7 mg g(-1) at room temperature according to the Langmuir adsorption isotherm(R-2 > 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.