graphitic carbon nitride nanospheres as an adsorbent for effective waste water treatment: methylene blue removal from aqueous medium

Here we report a simple and eco-friendly solvothermal synthesis of graphitic carbon nitride nanospheres (g-cnns) at 180 oc. the synthesized g-cnns is characterized by various analytical techniques such as fesem, pxrd, bet isotherm, zeta potential, edx and ft-ir spectroscopy. the adsorption property of g-cnns is studied using four different dyes in aqueous medium and found that g-cnns is an efficient material for cationic dye adsorption. a comprehensive investigation of the kinetics, isotherms and thermodynamics of methylene blue (mb) adsorption, is carried out. the adsorption of mb on g-cnns is well described by langmuir isotherm model, and the experimental data fits well with pseudo-second order kinetics. the high rate of adsorption (94.92% mb removal in 120 minute at neutral ph) is attributed to electrostatic interaction between negative charged g-cnns and cationic organic dye molecule. additionally, g-cnns demonstrated good reusability, retaining its efficiency for at least three cycles. over all our findings suggests that g-cnns has potential as an efficient adsorbent for wastewater treatment.