Potassium-doped g-CN enables efficient visible-light-driven dye degradation.

Element doping is recognized as an efficient method to boost the photocatalytic performance of photocatalysts. Here, a new potassium ion-doped precursor, potassium sorbate, was employed in melamine configuration during calcination process to prepare the potassium-doped g-CN (KCN). By various characterization techniques and electrochemical measurements, the doping of K in g-CN can efficiently modify the band structure to enhance the light absorption and greatly increase the conductivity to accelerate charge transfer and photogenerated carrier separation, ultimately achieving an excellent photodegradation of the organic pollutant (methylene blue, MB). These results have demonstrated that the approach of potassium incorporation in g-CN has potential in fabricating high-performance photocatalysts for organic pollutant removal.