A novel graphitic carbon nitride (g-CN) nanosheet adsorbent with a large surface area, remarkable hydrophilicity and high adsorption capacity, was presented for the removal of cadmium ions (Cd) and methylene blue (MB) from aqueous solution. Adsorption measurements were conducted systematically to study the influences of the contact time, initial concentrations of Cd and MB, temperature, and pH value. The maximum adsorption capacities of g-CN towards Cd and MB were 94.4 and 42.1 mg g, respectively, at 318.5 K when the initial concentrations of Cd and MB were 200 and 20 mg L, respectively. The adsorption kinetics fit a pseudo-second-order model. The high adsorption performance of the g-CN adsorbent can be attributed to the multiple adsorption sites on g-CN, including the π-π conjugate interactions and electrostatic attractions with pollutants in water. In addition, it is significant to achieve high adsorption performance of g-CN nanosheets by efficiently exposing the adsorption sites by adjusting the microstructure surface properties and dispersity in solution.
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